Catalog of Intensities and Magnitudes for 

Earthquakes in Alaska and the 

Aleutian lslands-1786-1981 
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Catalog of Intensities and Magnitudes for 

Earthquakes in Alaska and the 

Aleutian I slands-1786-1981 

By STANLEY R. BROCKMAN, A. F. ESPINOSA, and 

JOHN A. MICHAEL 

U.S. GEOLOGICAL SURVEY BULLETIN 1840 
DEPARTMENT OF THE INTERIOR 

DONALD PAUL HODEL, Secretary 

U. S. GEOLOGICAL SURVEY 

Dallas L. Peck, Director 

UNITED STATES GOVERNMENT PRINTING OFFICE: 1988 

For sale by the 

Books and Open-File Reports Section 

U.S. Geological Survey 

Federal Center 

Box 25425 

Denver, CO 80225 

Ubrary of Congress Cataloging-In-Publication Data 

Brockman, Stanley A. 

Catalog of intensities and magnitudes for earthquakes in Alaska and the 

Aleutian Islands, 1786-1981. 

(U.S. Geological Survey bulletin ; 1840) 

Bibliography: p. 

Supt. of Docs. no.: I 19.3:1840 

1. Earthquake intensity-Alaska. 2. Earthquake intensityAlaska-Aleutian Islands. I. Espinosa, A. F. II. Michael, J. A. Ill. Title. 

IV. Series. 

QE75.B9 no. 1840 557.3 s [551.2'2'09798] ~00069 

[QE539.2.15] 
CONTENTS 

Glossary v 

Abstract 1 

Introduction 1 

Acknowledgments 1 

Intensity scale and its usage 2 

Description and characteristics of the catalog 2 

Magnitudes 3 

Conventions used 5 

Identification of anomalous intensities 6 

Studies on some significant earthquakes in Alaska 6 

References cited 7 

Supplemental references 8 

Appendix-Modified Mercalli Intensity Scale of 1931 9 

FIGURES 

1-5. Maps of Alaska and vicinity showing: 

1. Selected geographic features viii 

2. Major tectonic features 2 

3. Earthquakes from 1960-1983 with calculated magnitudes of 4.5 or greater 3 

4. Earthquakes from 1899-1981 with maximum intensity of VI or VII 4 

5. Earthquakes from 1899-1981 with maximum intensity of VIII or greater 5 

TABLES 

1. Earthquakes listed chronologically with their source parameters and 

corresponding reported intensity information 13 

2. Earthquakes from table 1 grouped according to their maximum Modified 

Mercalli Intensity rating 121 

3. Earthquakes from table 1 that have one or more published magnitude and their 

maximum intensities 161 

Table of Contents iii 

GLOSSARY 

[Trade and company names are used for descriptive purposes only and do not 

imply endorsement by the U.S. Geological Survey] 

aftershock. Secondary earthquake that follows the main shock. 

CIRES. Cooperative Institute for Research in Environmental Sciences, 

University of Colorado, Boulder, Colorado. 

epicenter. Point on the Earth's surface vertically above the hypocenter of an 

earthquake. 

epicentral distance (~). Distance from the epicenter to the reporting 

location. 

event. Defined as an earthquake in the context of this publication. 

HDF (Hypocentral Data Files). Seismological data base maintained by the 

U.S. Geological Survey. 

hypocenter. Point of origin of an earthquake at which rupture begins and 

from which seismic waves originate. 

lo. Maximum intensity rating assigned to a given earthquake. 

intensity. Degree of shaking at a specific place resulting from an earthquake 

(see Modified Mercalli Intensity Scale in appendix). 

isoseismals. Contours that enclose areas of equal intensity. 

locality. A place or location that has past or present cultural associations. 

lithosphere. The outer, rigid shell of Earth containing the crust and plates 

(Press and Siever, 1986). 

macroseismic effects. Effects that can be observed on the large scale, in the 

field, without instrumental aid (Richter, 1958). 

magnitude. A quantity characteristic of the total energy released by an earthquake. Richter (1958) devised the logarithmic magnitude scale known as 

the local magnitude (ML), which is in terms of the motion that would be 

measured by a standard type of seismograph located 100 km from the 

epicenter of an earthquake. The following magnitude types are used in this 

catalog: 

body wave (mb)· Magnitude determined from body-wave amplitudes. 

coda length (Me). Magnitude determined from overall length of the 

recorded wavetrain. 

local (ML). Magnitude determined from amplitudes recorded on a WoodAnderson seismograph at near distances. 

surface wave (Ms). Magnitude determined from amplitudes of 20-secondperiod surface waves at teleseismic distance. 

unified (m). A body-wave magnitude, as described by Richter (1958, 

p. 348-349). 

Glossary v 
magnitude source code. Codes that represent (1) the agency, (2) a 

seismograph station or (3) the catalog source (in italic) of a particular 

magnitude used in table 3. 

ADK. 

ANl. 

AN2. 

BD. 

BG. 

BRK. 

CFR. 

Adak, Alaska. 

Abe and Noguchi, 1983a. 

Abe and Noguchi, 1983b. 

Bath and Duda, 1979. 

Gutenberg, 1956. 

Berkeley, California. 

Ricl1ter, 1958. 

CGS. U.S. Coast and Geodetic Survey; PDE from January 1928-0ctober 

1970. 

COL. Fairbanks, Alaska. 

CUC. Boulder, Colorado (CIRES). 

EPB. Earth Physics Branch, Seismological Services of Canada, Ottawa, 

Ontario, Canada. A series of annual publications, 1960-1979, by various 

authors. 

ERL. Environmental Research Laboratories of NOAA; PDE from July 1971 

through August 1973. 

GIA. University of Alaska, Geophysical Institute, Fairbanks, Alaska. 

GOL. Golden (Bergen Park), Colorado. 

GR. Gutenberg and Richter, 1954. 

GS. U.S. Geological Survey; PDE from August 1973 through the present 

(1988). 

GSM. U.S. Geological Survey, Menlo Park, California. 

ISC. International Seismological Center, Berkshire, England. 

KAl. Abe, 1981. 

KA2. Abe, 1984. 

NOS. National Ocean Survey of NOAA; PDE from October 1970 through 

June 1971. 

PAL. Palisades, New York. 

PAS. Pasadena, California. 

PMR. Palmer, Alaska. 

PRU. Pruhonice, Czechoslovakia. 

SJD. Dud a, 1965. 

SSR. Kondorskaya and Shebalin, 1982. 

UPP. U ppsala, Sweden. 

vi U.S. Geological Survey Bulletin 1840 
main shock. Largest of a series of earthquakes. 

m. Unified magnitude. 

mb. Body-wave magnitude. 

Me. Coda-length magnitude. 

ML. Local magnitude. 

M 8 • Surface-wave magnitude. 

Modified Mercalli Intensity Scale. Numerical subjective index of an earthquake's effect on man, on structures, and on the Earth's surface. Ratings 

range from I to XII and are defined in the appendix. 

NOAA. National Oceanic and Atmospheric Administration. 

PD E (Preliminary Determination of Epicenters). Ongoing program, 

presently operated by the U.S. Geological Survey, designed to quickly 

determine and disseminate reasonably reliable estimates of earthquake locations and magnitudes. 

plate. One of the dozen or more segments of the lithosphere that are internally 

rigid and move independently over the interior, meeting in convergence zones 

and separating at divergence zones (Press and Siever, 1986). 

seismicity. Spatial distribution of earthquakes; a general term for the number 

of earthquakes in a unit of time. 

seismograph. Instrument that detects, magnifies, and records vibrations of the 

Earth, especially earthquakes. 

subduction zone. Zone along which one plate descends beneath another plate; 

defined by high seismicity. 

teleseismic distance. An epicentral distance greater than 1,000 km from the 

recording station. 

USE (United States Earthquakes). Annual periodical published since 1928 

by the agency responsible for the PDE program. 

Glossary vii 
Figure 1. Selected geographic features and localities in Alaska and vicinity. 

viii U.S. Geological Survey Bulletin 1840 

50"N 

130"W 
Catalog of Intensities and Magnitudes for 

Earthquakes in Alaska and the 

Aleutian Islands -1786-1981 

By Stanley R. Brockman, A. F. Espinosa, and John A. Michael 

Abstract 

An earthquake intensity catalog of the State of Alaska and 

the Aleutian Islands has been compiled and is presented in three 

tables: (1) 3,145 earthquakes and their intensity information 

listed chronologically, (2) the earthquakes sorted by maximum 

intensity, and (3) earthquakes in table 1 that have one or more 

magnitude determinations, listed chronologically. The maximum 

intensities range from I to XI (Modified Mercalli Intensity Scale), 

whereas magnitudes range from 3.6 to 8.7. Epicentral coordinates are given for about half the earthquakes listed in table 1. 

INTRODUCTION 

Alaska (fig. 1), is one of the most seismically active States in the United States and has had numerous 

earthquakes, some of which caused widespread damage. 

Seismicity of Alaska and the Aleutian Islands is high as 

a result of complicated tectonic processes in the region. 

Subduction of the Pacific plate under the North American plate (fig. 2) creates an area of near-constant seismic 

activity. Seismicity in this region has been summarized 

by Espinosa (1984) in a series of maps for different magnitude and depth ranges during 1960-1983. Instrumental locations of earthquakes that had magnitudes of 4.5 

and greater during 1960-1983 are shown on figure 3. 

Alaska's earthquake history is not well known because until recently Alaska has been physically distant 

from most seismic networks, and instruments recorded 

only large earthquakes. Historically, documentation of 

small events depended on observations and notes kept 

by local inhabitants. Alaska's first permanent settlements were established in the 1780's, but the population began to grow only in the 1890's when gold was 

discovered. Even in 1988 the population is sparse. However, data from felt earthquakes, even if the epicenter 

has not been instrumentally determined, can fill gaps 

in our know ledge of the seismic history of the region. 

The effects of earthquakes on man, on structures, 

and on the Earth's surface can be quantified by a numerical, subjective intensity rating. The intensity ratings used in this catalog are from the Modified Mercalli 

Intensity Scale (Wood and Neumann, 1931), which is 

reproduced in the appendix. 

Data from many sources were combined, assembled, and edited to produce the present catalog of 

Alaska intensities and magnitudes-tables 1, 2, and 3 

at the end of this report. A computer-readable data 

base of intensities for the Alaska region, obtained from 

the National Oceanic and Atmospheric Administration's Earthquake Data Service, served as the primary 

source. Epicenters, magnitudes, and intensities from 

other sources (most are listed in "References Cited", 

others in "Supplemental References") were merged with 

the primary-source data to create a more complete catalog. Conflicts between sources were resolved whenever 

possible by referring to earlier source reports. Unresolved differences were settled by giving preference to 

data originated by the agencies responsible for the PDE 

program. Much of the supplemental data (earthquake 

origin time, location, magnitude, and depth) were extracted from the Hypocentral Data Files (HDF), which 

are compiled and maintained by the National Earthquake Information Center of the U.S. Geological Survey. 

The objectives in merging these data were to fill 

the gaps in the primary-source data base; assure that 

the resulting catalog is as consistent as possible with regard to sources of earthquake parameters (origin time, 

epicentrallocation, depth, and magnitude); correct the 

original data entries for typographical errors, mislocation of geographical locations, and improper intensity 

assignments; and extend the intensity data by drawing upon sources that were not available or not used in 

the compilation of the primary-source data base. Although our emphasis was to utilize the available published intensity data, we also analyzed local descriptions 

of earthquake effects and assigned intensity ratings as 

necessary. 

ACKNOWLEDGMENTS 

The help of the following individuals is gratefully 

acknowledged; without their help, the catalog might 

still be in the editing stages: B.G. Reagor, who maintains the Hypocenter Data Search program and files; 

C.W. Stover and C. von Hake, for patiently answering 

questions related to data published in United States 

Earthquakes. 

Introduction 1 
figure 2. Major tectonic features of Alaska, showing lithospheric plate boundaries and major faults. Triangles along 

the Aleutian megathrust indicate the direction of subduction of the Pacific plate beneath the North American plate. 

(Modified from Plafker and Jacob, 1986: Beikman, 1980: and Estabrook, 1985.) 

INTENSITY SCALE AND ITS USAGE 

The Modified Mercalli Intensity Scale was published by Wood and Neumann (1931). The levels of 

earthquake effects assigned by this scale range from 

I (barely noticeable under favorable circumstances) to 

XII (total damage). The complete scale is reproduced 

in the appendix. 

Information about the effects of a particular earthquake (event) comes from questionnaires mailed to residents in the affected area, interviews, chronicles, scientific publications, church and governmental records, 

and newspaper articles. This information is compiled 

and analyzed by experts who use the Modified Mercalli Intensity Scale to assign an intensity rating for the 

earthquake to each town or locality. On the basis of 

these intensity ratings, isoseismal maps are constructed 

and published, such as the maps compiled by Espinosa 

and others (1986) for 16 of the most significant earthquakes in Alaska. 

The maximum intensity (Io) assigned to an earthquake can be used to assess its "size" in the absence 

of magnitudes determined by instruments. Maximum 

intensities are used by engineers and are utilized in the 

establishment of building design codes in areas prone 

2 U.S. Geological Survey Bulletin 1840 

to earthquake activity. Alaskan events whose Io= VI or 

VII are shown in figure 4, and those whose I0 ~ VIII 

are shown in figure 5. The approximate location of an 

epicenter can also be determined on the basis of macroseismic effects such as "felt reports", damage, and surface faulting. An intensity catalog such as this can fill 

gaps in our knowledge of the seismicity of a given region 

where the available instrumentally determined earthquake parameters are insufficient. 

DESCRIPTION AND CHARACTERISTICS 

OF THE CATALOG 

The main catalog is given in table 1 and consists 

of two parts-the earthquake source parameters and intensity information. Parameters include the date, time, 

location of epicenter, magnitude, and depth. Intensity 

information includes epicentral distance to reporting locality, geographic coordinates and name of reporting 

locality, and intensity. The earthquakes are listed 

chronologically from 1786-1981. Consecutive identification numbers have been assigned to each event in 

table 1 and can be used for cross-reference with tables 2 

and 3. 

The earthquake parameters, in general, have been 

determined by the U.S. Geological Survey and agen-
0 

0 

Figure 3. Earthquakes in Alaska and vicinity in 1960-1983 for which a magnitude (mb or Ms) greater than or equal 

to 4.5 has been c:alculated. (From Espinosa, 1984.) 

cies formerly reflponsible for the PDE program. Both 

types of data in the catalog have been supplemented 

by data extractE:d from special studies, including some 

new intensity aJ5sessments made during the course of 

this study, whenever these were available. 

Earthquakes in table 2 are grouped by Io rating 

(for example, all events from table 1 whose 10 =VII) 

and are listed in chronological order within each rating. 

The earthquake number, date, location, and magnitude 

of each earthquake are given; earthquake numbers correspond to thos4~ in tables 1 and 3. 

Earthquakes from table 1 for which one or more 

magnitudes have been published are listed chronologically in table 8. Earthquake numbers correspond to 

those in tables 1 and 2, and, except for columns "lo" 

and "Magnitude:", the column descriptions are the same 

as those in table 1. Every attempt has been made to 

credit magnitude to the original source. 

MAGNITUDE:S 

Additional magnitudes extracted from the sources 

described here have been used to supplement the intensity catalog. Only those mb and Ms magnitudes that 

were clearly identified and that have the method of calculation described in the source reference have been ineluded. Magnitudes ML and Me have also been included 

whenever possible; despite being less widely available, 

their methods of calculation are moderately well known. 

The HDF is, in effect, an archive of earthquake 

data contributed by many sources. The data include 

mb, Ms, and ML magnitudes computed by the U.S. 

Geological Survey (GS) and other agencies formerly responsible for the PDE program, as well as data received 

via computer tape from CUC, EPB, GSM, and ISC. 

Most magnitudes used to supplement the intensity catalog were extracted from the HD F. 

Dud a ( 1965) compiled earthquake locations and 

magnitudes from several sources for the period from 

1897 to 1964 with the intent that the computed magnitudes be as consistent as possible. He also obtained amplitude data from the Uppsala Seismological Observatory, Sweden, for 1897-1917 and calculated M8 magnitudes for them. He added to his table 

those events that had M8 magnitudes of 7.0 or greater. 

Bath and Duda (1979) extended Duda's (1965) catalog through 1977, as well as making additions, making 

corrections, and including mb magnitudes. 

Abe (1981) went further in the attempt to obtain a 

homogeneous magnitude catalog by recomputing magnitudes of events between 1904 and 1968, using a consisMagnitudes 3 
500N/ 

17o~'E>----

R \ ~:~</(i 

~~~0 ;~~----~--

""' \10391 

-... -... ......................... ~ 

Figure 4. Earthquakes in Alaska and vicinity from 1899-1981 whose epicenters had a maximum intensity (lo) of VI 

(open circles, o) or VII (solid circles, •) according to the Modified Mercalli Intensity Scale. Number in parentheses 

refers to earthquake number (Eq. No.) in tables 1-3. 

tent set of equations for M8 and mb. Abe subsequently 

updated and supplemented his 1981 catalog with newly 

acquired data and published the results in 1984. Note 

that the mb magnitudes computed by Abe (1981, 1984) 

are from broad-band instruments, as contrasted to those 

reported in the PDE by the U.S. Geological Survey 

or the Bulletin of the International Seismological Center (ISC) that are computed from short-period body 

waves, usually about 1-second periods. Although we 

have made no distinction between mb magnitudes in 

table 3 of this report, Abe (1981) cautions that the two 

types should not be directly compared. 

Abe and Noguchi (1983a) recomputed M8 magnitudes of large shallow events in the period 1898-

1917. To do so, they recalibrated the gains of the undamped Milne and Omori seismographs, both of which 

were in use during that time period, relative to modern instruments and magnitudes. In a later paper, 

Abe and Noguchi (1983b) determined that the original 

Gutenberg and Richter (1954) magnitudes had systematic errors, causing them to be overestimated. Because 

those magnitudes had been used to calibrate the seismographs used in their first paper (Abe and Noguchi, 

1983a), all the earlier magnitudes were recomputed and 

4 U.S. Geological Survey Bulletin 1840 

changed. The corresponding original Gutenberg and 

Richter (1954) magnitudes have been retained in table 3 

as a matter of historic interest, however. 

Most ML magnitudes computed now and in the 

past have been calculated from amplitudes recorded on 

instruments other than Wood-Anderson (W-A) seismographs (an integral element in the original formalization of the ML magnitude) and which are corrected 

for instrument response to simulate that of the W -A. 

Determining ML magnitudes in Alaska is further complicated in that the original ML scale was defined for 

usage in California and similar geological environments 

only. Although we know that ML magnitudes reported 

by Jordan and others (1968) were computed from W-A 

amplitudes, we are not certain that this is true for all 

local magnitudes in table 3 by the Adak and Palmer 

Observatories in Alaska. 

Small local events commonly are felt near the epicenter but tend not to have magnitudes assigned to 

them because they are not well recorded by seismographs at teleseismic distances. Coda-length or codawave duration magnitudes from the GSM and CUC 

networks were added to the catalog to ensure that the 

smaller local events would be represented in table 3. 
/ 

; '"-,,, __________ ~ 

/IX (2734) ·--~- / "tl.•-'1 ~-~~ 

'"" 

Figure 5. Earthquakes in Alaska and vicinity from 1899-1981 whose epicenters had a maximum intensity (lo) greater 

than or equal to VIII (solid circles, •) according to the Modified Mercalli Intensity Scale. Roman numerals indicate 

10 rating. Number in parentheses refers to earthquake number (Eq. No.) in tables 1-3. 

CONVENTIONS USED 

Several instances were found in the primarysource data base where the location, magnitude, and, 

on some occasions, intensities, of large earthquakes 

were also assigned to their larger aftershock sequences. 

Where instrumental locations of the aftershocks had not 

been calculated, the locations for the main shocks were 

allowed to remain associated with the aftershocks as 

well. However, magnitudes and (or) intensity data were 

not included in the catalog entries for the aftershocks 

unless the data explicitly applied to them. 

We found that the HDF entries inconsistently 

identified the name of the government agency responsible for the PDE program because the agency changed 

its name several times in the early 1970's. We adopted 

the following naming conventions to give credit to the 

proper organizations. 

Those magnitudes identified as having been obtained from either USE or COL (College, Alaska) are 

now attributed to the predecessor .agency of the U.S. 

Geological Survey which was then responsible for the 

PDE program. These agencies are the U.S. Coast 

and Geodetic Survey (CGS; 1928-0ctober 1970), National Ocean Survey (NOS; October 1970-June 1971), 

Earth Research Laboratories (ERL; July 1971-August 

1973), and U.S. Geological Survey (GS; August 1973 to 

present). 

An exception to the naming conventions occurred 

when the COL identifier was retained to emphasize the 

source of the ML magnitudes of the June 21, 1967, 

earthquakes near Fairbanks. These magnitudes were 

found in Jordan and others (1968) and had not been 

included in the primary source. 

Many NOAA offices were transferred to the U.S. 

Geological Survey in 1973, but the Palmer, Alaska, 

Observatory (PMR) remained with NOAA. The PMR 

magnitudes prior to that reorganization were redesignated in the same manner as described previously for 

the USE and COL magnitudes. The PMR designation 

has been retained subsequent to the reorganization. 

In 1978, the Geophysical Institute, University of 

Alaska at Fairbanks began reporting ML magnitudes 

for some earthquakes in central Alaska. Because these 

ML magnitudes are distinct from those computed by 

COL, they are separately identified as GIA in table 3. 

Conventions Used 5 
IDENTIFICATION OF ANOMALOUS 

INTENSITIES 

It was necessary to identify and correct any erroneous data obtained from the primary-source data base. 

Data entry errors, identified primarily by referring to 

the United States Earthquake (USE) series, accounted 

for the bulk of the corrections. Other inaccuracies are 

possible when localities were reported in USE to have 

felt an earthquake at an epicentral distance (D..) of more 

than 1,000 kilometers. This does not imply that earthquakes are not felt at these distances; however, it is 

more likely to happen with large-magnitude events, for 

example, the March 28, 1964 event (earthquake 1653). 

Erroneous geographic coordinates of either the epicenter or the reporting locality can cause errors in the epicentral distance. Locality names are not always unique 

and coordinates of a similarly named locality may have 

been used in computing epicentral distance, resulting 

in errors. We found that earthquakes and felt reports 

occasionally were mismatched, also resulting in errors. 

About twenty intensities in the catalog are shown 

for reporting localities whose epicentral distances are 

greater than 1,000 km from the earthquake reported. 

Of these, the following thirteen intensity entries in the 

catalog appear to be inconsistent with the location or 

magnitude of the associated earthquake. 

November 12, 1927, event (earthquake 125}-Near 

Sitka, where an intensity of IV was reported. Shaw Island, about 1,100 km distant, reported an intensity of 

III. However, if the reporting location was Shaw Islands 

(lat 58.20° N., long 136.24° W.), just off the north coast 

of Chichagof Island, the distance would have been about 

200 km and the intensity of III would be more consistent, given that distance. 

April 19, 1928, events (earthquakes 146 and 

147}-Reported felt at Igloo, at an epicentral distance 

of 1,100 km. United States Earthquakes (1928) gave 

only the coordinates of the epicenter; the only Igloo 

found in present-day sources is on the Seward Peninsula. These events appear not to have been felt at settlements at nearer distances. Perhaps the felt information 

from Igloo was identified with the wrong earthquakes. 

May 5, 1958, event {earthquake 1365)-Reported 

to have been felt in Chicago, Alaska (United States 

Earthquakes, 1958). No locality appears to have this 

name and we do not know where the coordinates for 

Chicago were obtained. However, because the names 

Chichagof and Chicago tend to be used interchangeably (Chichagof Bay has also been known as Chicago 

Bay; Chichagof Island as Chicagos Island), perhaps 

Chichagof-at lat 57.66° N., long 136.09° W.-was actually the location at which this event was felt. These 

coordinates lead to a distance of 30 km, similar to the 

distance from the event to Sitka, which also reported 

an intensity of V. 

6 U.S. Geological Survey Bulletin 1840 

Five aftershocks of the March 28, 1964, event 

(earthquakes 1669, 1672, 1677, 1678, and 1680}-The 

catalog shows these aftershocks of earthquake 1653 as 

felt at Adak at epicentral distances of about 1,500-1,600 

km. United States Earthquakes (1964) shows entries for 

Adak at about the same times as the aftershocks but 

gives no epicentrallocation. Probably the Adak felt reports were erroneously attributed to the five aftershocks 

when the primary-source data base was created. 

February 22, 1972, event {earthquake 2394}-This 

magnitude-4.2 (mb) event was reported by the press to 

have been felt at Port Heiden (United States Earthquakes, 1972) at an epicentral distance of nearly 1,300 

km. Considering the small size of the event and the 

large distance, the press report was probably incorrect. 

The following catalog entries appear to be correct but are mentioned here because their epicentral 

distances are greater than 1,000 km. 

September 4, 1899, event (earthquake 14}-This 

magnitude-8.3 (Ms) event was felt at Russian Mission, 

an epicentral distance of about 1,100 km from the earthquake. Geographic coordinates of Russian Mission and 

the earthquake are approximately correct in the data 

base. The reporting of the felt event at this distance is 

consistent with reports of the event of March 28, 1964, 

that had the same magnitude. 

April 27, 1933, event {earthquake 338)-This 

event was described by United States Earthquakes 

(1933) as "felt severely ... along the Aleutians." The 

primary-source entry for the Aleutian Islands is being 

retained for completeness even though the coordinates 

used to compute the epicentral distance coincide with 

the center of the Aleutian Islands. 

February 28, 1979, event {earthquake 3025}-

Kontignak reported an intensity III from this magnitude-6.4 (mb) event. The earthquake was felt widely, 

so an epicentral distance of about 1,200 km is not unreasonable. 

Primary-source entries showing epicentral distances of less than 1,000 km may contain similar possible errors. The entries just discussed and similar 

entries have been retained in the catalog until they can 

be resolved. 

Three nuclear tests were conducted on Amchitka 

Island in the Aleutians. The tests were Long Shot ( October 29, 1965), Milrow (October 2, 1969), and Cannikin (November 6, 1971). Of these, Cannikin, shown 

in the catalog as earthquake 2366, was felt at Adak. 

STUDIES ON SOME SIGNIFICANT 

EARTHQUAKESIN ALASKA 

A number of special study reports about specific 

events-or series of events-in Alaska were used to verify data in the intensity catalog. The detailed studies 
also provided new data that were added to the catalog. 

Brief descriptions of eight of the reports are provided 

here for the interested reader. 

Tarr and Martin (1912) reported earthquake damage and effects upon people from the September, 1899 

shocks in considerable detail, as well as some data 

related to earthquakes during 1907-1911. This study 

provided new observations which we included in the catalog, based on our interpretation of some of the earthquake effects reported in Tarr and Martin. For example, we reinterpreted an event that occurred on September 22, 1911, as having an I0 of IX. Tarr and Martin 

had estimated it as a IX-X event, whereas Coffman and 

others (1982) listed it with an I0 of VII-VIII. 

Jordan and others (1968) documented a short sequence of earthquakes that occurred in June and July 

of 1967. These events were felt in the Fairbanks area 

but were small enough in magnitude that they were not 

well recorded by seismographs at teleseismic distances. 

About 20 ML magnitudes computed by the College Observatory (COL) were added to the catalog for several 

of the largest shocks and for which only intensity data 

had previously been available. Jordan and others (1968) 

described only the earthquake effects of the main shock. 

Cloud and Scott (1972) and Harding and Algermissen (1972) described the Prince William Sound 

earthquake of March 1964 in great detail in the eightvolume set of reports published in 1972 under the auspices of the National Academy of Science. 

Stover and others (1980) discussed the cultural 

effects of the February 28, 1979, St. Elias earthquake. 

They presented isoseismal maps of that event as well 

as of the September 4, 1899, September 10, 1899, October 9, 1900, and July 10, 1958 earthquakes in the St. 

Elias vicinity. The February 28, 1979, St. Elias earthquake and aftershocks are also the subject of Stephens 

and others (1980). 

Meyers and others (1976) published an analysis 

of the intensities and recurrence rates of earthquakes in 

Alaska, which was based on what they called the Alaska 

Intensity File. 

Davies and others (1981) considered the earthquake potential of the Shumagin seismic gap, Alaska 

Peninsula, and the history of large events in that 

vicinity. 

REFERENCES CITED 

Abe, Katsuyuki, 1981, Magnitudes of large shallow earthquakes from 1904 to 1980: Physics of the Earth and Planetary Interiors, v. 27, p. 72-92. 

___ 1984, Complements to "Magnitudes of large shallow 

earthquakes from 1904 to 1980": Physics of the Earth 

and Planetary Interiors, v. 34, p. 17-23. 

Abe, Katsuyuki, and Noguchi, Shin'ichi, 1983a, Determination of magnitude for large shallow earthquakes, 1898-

1917: Physics of the Earth and Planetary Interiors, v. 32, 

p. 45-59. 

___ 1983b, Revision of magnitudes of large shallow earthquakes, 1897-1912: Physics of the Earth and Planetary 

Interiors, v. 33, p. 1-11. 

Bath, Markus, and Duda, S.J., 1979, Some aspects of global 

seismicity: Uppsala, Sweden, Seismological Institute Report 1-79, 39 p., 2 figs. 

Beikman, H.M., 1980, Geologic map of Alaska: U.S. Geological Survey and State of Alaska, Dept. of Natural Resources, Div. of Geology and/Geophysical Surveys, scale, 

1:2,500,000. 

Cloud, W.K., and Scott, N.H., 1972, Distribution of intensity, in National Academy of Sciences, The great Alaska 

earthquake of 1964: Seismology and Geodesy, p. 65-108. 

Coffman, J.L., Von Hake, C.A., and Stover, C.W., eds., 1982, 

Earthquake history of the United States, with a supplement through 1980: U.S. Department of Commerce and 

U.S. Geological Survey, Publication 41-1, 208 p., 50 supplement pages. 

Davies, J., Sykes, L., House, L., and Jacob, K., 1981, Shumagin seismic gap, Alaska Peninsula-History of great 

earthquakes, tectonic setting, and evidence for high seismic potential: Journal of Geophysical Research, v. 86, 

no. B5, p. 3821-3855. 

Duda, S.J ., 1965, Secular seismic energy release in the circumPacific belt: Tectonophysics, v. 2, no. 5, p. 409-452. 

Espinosa, A.F., 1984, Seismicity of Alaska and the Aleutian Islands, 1960-1984: U.S. Geological Survey Open-File Report 84-855, 1 sheet. 

Espinosa, A.F., Brockman, S.R., and Michael, J.A., 1986, 

Modified-Mercalli intensity distribution for the most significant earthquakes in Alaska, 1899-1981: U.S. Geological Survey Open-File Report 86-203, 1 sheet. 

Estabrook, C.H., 1985, Seismotectonics of northern Alaska: 

Fairbanks, Alaska, University of Alaska M.A. thesis, 77 p. 

Gutenberg, Beno, 1956, Great earthquakes 1896-1903: Trans· 

actions of the American Geophysical Union, v. 37, no. 5, 

p. 608-614. 

Gutenberg, Beno, and Richter, C.F., 1954, Seismicity of the 

earth and associated phenomena: Princeton University 

Press (second edition); facsimile of 1954 edition published 

in 1965 by Hafner Publishing Company, New York, 310 p. 

Harding, S.T., and Algermissen, S.T., 1972, The focal mech· 

anism of this and related earthquakes, in National 

Academy of Sciences, The great Alaska earthquake of 

1964: Seismology and Geodesy, p. 197-233. 

Jordan, J.N., Dunphy, G.J., and Harding, S.T., 1968, Pre· 

liminary seismological report, in The Fairbanks, Alaska, 

earthquakes of June 21, 1967: U.S. Department of Com· 

merce, Environmental Science Services Administration, 

p. 1-32. 

Kondorskaya, N.Y., and Shebalin, N.Y., eds., 1982, New catalog of strong earthquakes in the USSR from ancient times 

through 1977: Boulder, Colorado, World Data Center A 

for Solid Earth Geophysics, Report SE31, 608 p. 

Meyers, Herbert, Brazee, R.J., Coffman, J.L., and Lessig, 

S.R., 1976, An analysis of earthquake intensities and recurrence rates in and near Alaska: U.S. Department of 

References Cited 7 
Commerce, National Oceanic and Atmospheric Administration Technical Memorandum EDS NGSDC-3, 101 p. 

Plafker, George, and Jacob, K.H., 1986, Seismic sources in 

Alaska, in Hays, W. W ., and Gori, P.L., eds., A workshop 

on "Evaluation of regional and urban earthquake hazards 

and risk in Alaska": U.S. Geological Survey Open-File 

Report 86-79, p. 76-82. 

Press, F. and Siever, R., 1986, Earth: New York, New York, 

W.H. Freeman and Company, 656 p. 

Richter, C.F., 1958, Elementary seismology: San Francisco, 

Calif., W .H. Freeman and Company, 768 p. 

Stephens, C.D., Lahr, J.C., Fogleman, K.A., and Horner, 

R.B., 1980, The St. Elias, Alaska, earthquake of February 28, 1979-Regional recording of aftershocks and 

short-term, pre-earthquake seismicity: Seismological Society of America Bulletin, v. 70, no. 5, p. 1607-1633. 

Stover, C.W., Reagor, B.G., and Wetmiller, R.J., 1980, Intensities and isoseismal map for the St. Elias earthquake 

of February 28, 1979: Seismological Society of America 

Bulletin, v. 70, no. 5, p. 1635-1649. 

Tarr, R.S., and Martin, Lawrence, 1912, The earthquakes at 

Yakutat Bay, Alaska, in September, 1899: U. S. Geological Survey Professional Paper 69, 135 p. 

United States Earthquakes, Annual publication of the U.S. 

Department of Commerce, U.S. Coast and Geodetic Survey from 1928 through 1968, the NOAA National Ocean 

Survey for 1969, the NOAA Environmental Data Service 

through 1972, the NOAA/EDS jointly with the U.S. Geological Survey through 1980, and the U.S. Geological 

Survey from 1981 to the present. 

Wood, H.O. and Neumann, Frank, 1931, Modified Mercalli 

Intensity Scale of 1931: Seismological Society of America 

Bulletin, v. 21, no. 4, p. 277-283. 

SUPPLEMENTAL REFERENCES 

Buland, Ray, and Taggart, James, 1981, A mantle wave magnitude for the St. Elias, Alaska, earthquake of 28 February, 1979: Seismological Society of America Bulletin, 

v. 71, no. 4, p. 1143-1158. 

Cloud, W.K., and Knudson, C.F., 1968, Preliminary engineering seismological report, in The Fairbanks, Alaska, 

earthquakes of June 21, 1967: U.S. Department of Commerce, Environmental Science Services Administration, 

p. 33-60. 

Davis, T.N., and Echols, Carol, 1962, A table of Alaskan 

earthquakes, 1788-1961: University of Alaska Geophysical Institute, Geophysical Research Report 8, 44 p. Also 

identified on cover as report UAG-R131. 

Davis, T.N., and Sanders, N.K., 19GO, Alaska earthquake of 

July 10, 1958-lntensity distribution and field investigation of northern epicentral region: Seismological Society 

of America Bulletin, v. 50, no. 2, p. 221-252. 

8 U.S. Geological Survey Bulletin 1840 

Fogleman, K.A., Stephens, C.D., Lahr, J.C., Rogers, J.A., 

Cancilla, R.S., Tam, Roy, Freiberg, J .A., and Melnick, 

J.P., 1983, Catalog of earthquakes in southern Alaska, 

April-June 1980: U.S. Geological Survey Open-File Report 83-14, 54 p. 

Fogleman, K.A., Stephens, C.D., Lahr, J.C., Rogers, J.A., 

Cancilla, R.S., Tam, Roy, Helton, S.M., Freiberg, J.A., 

and Melnick, J.P., 1983, Catalog of earthquakes in southem Alaska, July-September 1980: U.S. Geological Survey Open-File Report 83-15, 54 p. 

Gutenberg, Beno, and Richter, C.F., 1956, Earthquake magnitude, intensity, energy, and acceleration (second paper): 

Seismological Society of America Bulletin, v. 46, no. 2, 

p. 105-145. 

Jordan, J.N., Lander, J.F., and Black, Rudolph, 1965, Aftershocks of the 4 February 1965 Rat Islands earthquake: 

Science, v. 148, p. 1323-1325. 

Orth, D.J., 1967, Dictionary of Alaska place names: U.S. Geological Survey Professional Paper 567, 1084 p., 12 maps. 

Rinehart, Wilbur, Meyers, Herbert, and Von Hake, C.A., 

1985, Summary of earthquake data base: U.S. Department of Commerce, National Oceanic and Atmospheric 

Administration, National Geophysical Data Center, Key 

to geophysical records documentation No. 21, 70 p. 

Stauder, William, 1968, Mechanism of the Rat Island earthquake sequence of February 4, 1965, with relation to island arcs and sea-fioor spreading: Journal of Geophysical 

Research, v. 73, no. 12, p. 3847-3858. 

Stephens, C.D., Astrue, M.C., Pelton, J.R., Fogleman, K.A., 

Page, R.A., Lahr, J.C., Allan, M.A., and Helton, S.M., 

1982, Catalog of earthquakes in southern Alaska, AprilJune 1978: U.S. Geological Survey Open-File Report 82-

488, 36 p. 

Stephens, C.D., Fogleman, K.A., Lahr, J.C., Helton, S.M., 

Cancilla, R.S., Tam, Roy, and Freiberg, J .A., 1980, Catalog of earthquakes in southern Alaska, January-March 

1980: U.S. Geological Survey Open-File Report 80-1253, 

55 p. 

Stephens, C.D., Lahr, J.C., Fogleman, K.A., Helton, S.M., 

Cancilla, R.S., Tam, Roy, and Baldonado, K.A., 1980, 

Catalog of earthquakes in southern Alaska, OctoberDecember 1979: U.S. Geological Survey Open-File Report 80-2002, 53 p. 

U.S. Geological Survey, Alaska-Geographic names information system; Alphabetical finding list: Spiral bound computer printout, 528 p., available at cost from U.S. Geological Survey, National Cartographic Information Center, 

507 National Center, Reston, Virginia 22092. 

Van Wormer, D., Davies, J., and Gedney, L., 1973 (September), Central Alaska earthquakes during 1972: University of Alaska Geophysical Institute Report Series, Report UAG R-224, 30 p. 
APPENDIX 

MODIFIED MERCALLI INTENSITY SCALE OF 1931 

Adapted from Sieberg's Mercalli-Cancani scale, modified and condensed. 

I Not felt -or, except rarely under especially favorable circumstances. 

Under certain conditions, at and outside the boundary of the area in 

which a great shock is felt : 

sometimes birds, animals, reported uneasy or disturbed; 

sometimes dizziness or nausea experienced; 

sometimes trees, structures, liquids, bodies of water, may swaydoors may swing, very slowly. 

II Felt indoors by few, especially on upper floors, or by sensitive, or 

nervous persons. 

Also, as in grade 1, but often more noticeably: 

sometimes hanging objects may swing, especially when delicately 

suspended; 

sometimes trees, structures, liquids, bodies of water, may sway, 

doors may swing, very slowly; 

sometimes birds, animals, reported uneasy or disturbed ; 

sometimes dizziness or nausea experienced. 

III Felt indoors by several, motion usually rapid vibration. 

Sometimes not recognized to be an earthquake at first. 

Duration estimated in some cases. 

Vibration like that due to passing of light, or lightly loaded trucks, or 

heavy trucks some distance away. 

Hanging objects may swing slightly. 

Movements may be appreciable on upper levels of tall structures. 

Rocked standing motor cars slightly. 

IV Felt indoors by many, outdoors by few. 

Awakened few, especially light sleepers. 

Frightened no one, unless apprehensive from previous experience. 

Vibration like that due to passing of heavy, or heavily loaded trucks. 

Sensation like heavy body striking building, or falling of heavy objects 

inside. 

Rattling of dishes, windows, doors; glassware and crockery clink 

and clash. 

Creaking of walls, frame, especially in the upper range of this grade. 

Hanging objects swung, in numerous instances. 

Disturbed liquids in open vessels slightly. 

Rocked standing motor cars noticeably. 

V Felt indoors by practically all, outdoors by many or most: outdoors direction estimated. 

Awakened many, or most. 

Frightened few-slight excitement, a few ran outdoors. 

Buildings trembled throughout. 

Broke dishes, glassware, to some extent. 

Cracked windows-in some cases, but not generally. 

Overturned vases, small or unstable objects, in many instances, 

with occasional fall. 

Hanging objects, doors, swing generally or considerably. 

Knocked pictures against walls, or swung them out of place. 

Opened, or closed, doors, shutters, abruptly. 

Pendulum clocks stopped, started, or ran fast, or slow. 

Moved small objects, furnishings, the latter to slight extent. 

Spilled liquids in small amounts from well-filled open containers. 

Trees, bushes, shaken slightly. 

Appendix-Modified Mercalli Intensity Scale 9 
VI Felt by all, indoors and outdoors. 

Frightened many, excitement general, some alarm, many ran outdoors. 

Awakened all. 

Persons made to move unsteadily. 

Trees, bushes, shaken slightly to moderately. 

Liquid set in strong motion. 

Small bells rang-church, chapel, school, etc. 

Damage slight in poorly built buildings. 

Fall of plaster in small amount. 

Cracked plaster somewhat, especially fine cracks chimneys in some 

instances. 

Broke dishes, glassware, in considerable quantity, also some windows. 

Fall of knick-knacks, books, pictures. 

Overturned furniture in many instances. 

Moved furnishings of moderately heavy kind. 

VII Frightened all-general alarm, all ran outdoors. 

Some, or many, found it difficult to stand. 

Noticed by persons driving motor cars. 

Trees and bushes shaken moderately to strongly. 

Waves on ponds, lakes, and running water. 

Water turbid from mud stirred up. 

Incaving to some extent of sand or gravel stream banks. 

Rang large church be11s, etc. 

Suspended objects made to quiver. 

Damage negligible in buildings of good design and construction, slight 

to moderate in we11-built ordinary buildings, considerable in poorly 

built or badly designed buildings, adobe houses. old walls (especially 

where laid up without mortar), spires, etc. 

Cracked chimneys to considerable extent, walls to some extent. 

Fall of plaster in considerable to large amount, also some stucco. 

Broke numerous windows, furniture to some extent. 

Shook down loosened brickwork and tiles. 

Broke weak chimneys at the roof-line (sometimes damaging roofs). 

Fall of cornices from towers and high buildings. 

Dislodged bricks and stones. 

Overturned heavy furniture, with damage from breaking. 

Damage considerable to concrete irrigation ditches. 

VIII Fright general-alarm approaches panic. 

Disturbed persons driving motor cars. 

Trees shaken strongly-branches, trunks, broken off, especially palm 

trees. 

Ejected sand and mud in small amounts. 

Changes: temporary, permanent; in flow of springs and wells; dry 

wells renewed flow; in temperature of spring and well waters. 

Damage slight in structures (brick) built especially to withstand earthquakes. 

Considerable in ordinary substantial buildings, partial collapse : 

racked, tumbled down, wooden houses in some cases ; threw out 

panel wa11s in frame structures, broke off decayed piling. 

Fall of walls. 

Cracked, broke, solid stone walls seriously. 

Wet ground to some extent, also ground on steep slopes. 

Twisting, fall, of chimneys, columns, monuments, also factory 

stacks, towers. 

Moved conspicuously, overturned, very heavy furniture. 

10 U.S. Geological Survey Bulletin 1840 
I X Panic general. 

Cracked ground conspicuously. 

Damage considerable in (masonry) structures built especially to withstand earthquakes : 

threw out of plumb some wood-frame houses built especially to withstand earthquakes ; 

great in substantial (masonry) buildings, some collapse in large part; 

or wholly shifted frame buildings off foundations, racked frames; 

serious to reservoirs; underground pipes sometimes broken. 

X Cracked ground, especially when loose and wet, up to widths of several 

inches ; fissures up to a yard in width ran parallel to canal and stream 

banks. 

Landslides considerable from river banks and steep coasts. 

Shifted sand and mud horizontally on beaches and flat land. 

Changed level of water in wells. 

Threw water on banks of canals, lakes, rivers, etc. 

Damage serious to dams, dikes, embankments. 

Severe to well-built wooden structures and bridges, some destroyed. 

Developed dangerous cracks in excellent brick walls. 

Destroyed most masonry and frame structures, also their foundations. 

Bent railroad rails slightly. 

Tore apart, or crushed endwise, pipe lines buried in earth. 

Open cracks and broad wavy folds in cement pavements and asphalt 

road surfaces. 

XI Disturbances in ground many and widespread, varying with ground 

material. 

Broad fissures, earth slumps, and land slips in soft, wet ground. 

Ejected water in large amount charged with sand and mud. 

Caused sea-waves ("tidal" waves) of significant magnitude. 

Damage severe to wood-frame structures, especially near shock 

centers. 

Great to dams, dikes, embankments, often for, long distances. 

Few, if any (masonry), structures remained standing. 

Destroyed large well-built bridges by the wrecking of supporting piers, 

or pillars. 

Affected yielding wooden bridges less. 

Bent railroad rails greatly, and thrust them endwise. 

Put pipe lines buried in earth completely out of service. 

XII Damage total-practically all works of construction damaged greatly or 

destroyed. 

Disturbances in ground great and varied, numerous shearing cracks. 

Landslides, falls of rock of significant character, slumping of river 

banks, etc., numerous and extensive. 

Wrenched loose, tore off, large rock masses. 

Fault slips in firm rock, with notable horizontal and vertical offset displacements. 

Water channels, surface and underground, disturbed and modified 

greatly. 

Dammed lakes, produced waterfalls, deflected rivers, etc. 

Waves seen on ground surfaces (actually seen, probably, in some cases). 

Distorted lines of sight and level. 

Threw objects upward into the air. 

Appendix-Modified Mercalli Intensity Scale 11 

Table 1. Earthquakes listed chronologically with their source parameters and corresponding reported intensity 

information. Explanation of column headings follows: 

Eq. No.-Consecutive earthquake identification number assigned to each event and used for cross-reference with 

tables 2 and 3. 

Date-Year (Yr), month (Mo), and day (Dy) that event occurred. 

Time-Hour (Hr), minutes (Mn), and seconds (Sec) of the origin time of the event in universal coordinated 

time (UTC). A few times (UTC) given are those when an earthquake was felt, rather than an instrumentally 

determined origin time. 

Epicenter-Identifies the geographic epicenter by latitude (N) and longitude (W), in decimal degrees. The few 

east longitudes (E) are so noted. 

Mag-Generally a body-wave (mb) magnitude, but can be an M5 , ML, or Me magnitude. Further magnitude 

information is given in table 3. 

Dep-The instrumental depth of the hypocenter, in kilometers . 

.A-Distance, in kilometers, from the epicenter to the locality that felt the event. This is the epicentral distance. 

Obs. Location-Geographic latitude and longitude of the reporting locality. 

INT -Modified Mercalli intensity assigned to the description of the earthquake effects at the reporting locality. 

Locality-Name or other identification of the locality at which the event was reported. Asterisk (*)indicates event 

reported in the earthquake literature but for which no intensity data are currently available. 

Table 1-Earthquakes and Intensity Data 13 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

l~;q. Date Time Epicenter !Mag Dep ~ Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

1 1786 59.00 154.00 622 55.43 161.91 5 Pavlof Volcano 

2 1788 07 27 59.25 159.41 5 Alaska Peninsula 

55.16 160.00 5 Shumagin Islands 

54.41 162.66 5 Sanak Island 

3 1796 05 54.00 167.00 48 53.58 166.83 5 Unalaska Island 

4 1802 54.00 167.00 48 53.58 166.83 5 Unalaska Island 

5 1812 52.00 17 4.50 13 52.12 174.50 6 Atka Island 

6 1817 04 53.00 168.00 32 53.26 168.21 5 Umnak 

7 1818 54.00 167.00 26 53.77 166.98 7 Makushin 

8 1826 06 54.00 167.00 35 53.86 166.53 5 Unalaska 

9 1899 04 02 02 45 55.50 161.00 29 55.33 160.65 5 Coal Harbor 

36 55.33 160.51 5 Sand Point 

48 55.18 160.50 5 Unga 

10 1899 06 08 20 00 55.18 160.50 3 Unga 

11 1899 07 11 61.00 151.00 18 61.01 151.33 5 Tyonek 

12 1899 07 14 12 55 55.18 160.50 3 Unga 

13 1899 07 15 08 30 53.86 166.53 3 Unalaska 

14 1899 09 04 00 22 60.00 142.00 8.3 25 24 60.07 142.41 10 Cape Yakataga 

216 60.55 145.75 9 Cordova 

133 59.55 139.81 7 Yakutat 

225 59.13 138.41 7 Dry Bay (East River) 

240 61.67 144.80 7 Tonsina River 

265 61.11 146.28 7 Valdez 

206 61.75 143.20 6 Wrangell Muuntains 

281 61.95 145.30 6 Copper Center 

329 60.05 147.90 6 Latouche 

379 59.48 135.34 6 Dye a 

382 59.38 135.33 6 Skagway 

385 59.18 135.38 6 Haines 

425 60.40 149.62 6 Kenai Lake 

705 63.38 153.26 6 Telida 

390 60. 7~~ 135.08 4 Whitehorse, Y. T. 

1068 61.80 161.35 4 Russian Mission 

385 62.04 136.25 3 Carmacks (Tantalus), Y.T. 

501 57.06 135.50 3 Sitka 

139 59.98 139.50 F Disenchantment Bay 

142 60.20 144.52 F Kat all a 

147 59.80 144.60 F Kayak I. (Cape St. Elias) 

217 60.46 145.80 F Whitshead Point 

231 61.30 145.30 F Tiekel Valley 

255 61.53 145.49 F Tonsina Lake 

337 62.92 143.67 F Menasta Pass 

474 58.30 134.41 F Juneau 

481 59.62 133.45 F Surprise Lake, B.C. 

495 58.20 134.10 F Taku Inlet 

494 61.54 150.51 F Susitna 

524 61.01 151.33 F Tyonek 

537 59.63 151.55 F Homer 

978 65.92 156.25 F Treat Island 

15 1899 09 10 21 40 60.00 140.00 8.6 28 59.98 139.50 11 Disenchantment Bay 

51 59.55 139.81 11 Yakutat 

132 59.13 138.41 7 Dry Bay (East River) 

252 60.20 144.52 7 Kat alia 

14 U.S. Geological Survey Bulletin 1840 
f4~ARTHQUAKE PARAMETJ.;Hs INTENSITY INFORMATION 

~~- Dat.e Time Epicent.er Mag Dcp 6. Obs. Loca.tion INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon ow km km Lat 0 N Lon °W MM 

15 1899 09 10 21 40 60.00 140.00 8.6 272 59.38 135.33 7 Skagway 

164 60.10 137.07 6 Dalton House, Y.T. 

262 58.96 135.85 6 Bartlett Bay 

283 60.73 135.08 6 Whitehorse, Y. T. 

285 58.32 136.25 6 Dundas Bay 

309 58.85 135.05 6 Berners Bay 

325 60.46 145.80 6 Whitshead Point 

357 59.57 133.70 6 Atlin, B.C. 

366 61.11 146.28 6 Valdez 

372 58.30 134.41 6 Juneau 

418 60.20 132.50 6 Teslin Lake, Y.T. 

632 61.01 151.33 6 Tyonek (Ladds Station) 

319 62.25 136.33 5 Five Finger Rapids, Y.T. 

535 64.76 141.33 5 Eagle 

757 66.26 145.81 5 Birch Creek 

376 63.36 139.36 4 Stewart River, Y.T. 

458 57.67 133.47 4 Sumdum 

469 64.15 141.46 4 Wade Creek 

419 57.06 135.50 3 Sitka 

203 59.65 136.45 F Glacier Camp 

271 59.18 135.48 F Pyramid Harbor 

274 61.15 144.42 F Fall Creek 

281 59.82 134.98 F Bennett, B.C. 

305 62.04 136.25 F Carmacks (Tantalus), Y.T. 

317 58.62 135.13 F White Pass, B.C. 

318 60.34 134.30 F Tagish, Y.T. 

327 61.36 145.30 F Tonsina River 

334 62.70 137.30 F Fort Selkirk, Y. T. 

370 59.62 133.45 F Surprise Lake, B.C. 

649 59.63 151.55 F Homer 

16 1900 10 09 12 28 58.00 152.00 8.3 25 37 57.75 152.41 8 Kodiak-Woody Island 

469 61.08 146.35 5 Fort Liscum 

474 61.11 146.28 5 Valdez 

165 59.48 151.75 4 Seldovia 

578 61.95 145.28 4 Klutina River 

726 59.55 139.81 3 Yakutat 

337 61.01 151.33 F Tyonek 

489 60.46 144.91 F Copper River Delta 

512 60.15 144.10 F Controller Bay 

17 1900 10 11 57.75 152.50 3 Kodiak 

18 1900 10 12 15 15 57.75 152.50 3 Kodiak 

19 1900 10 13 57.75 152.50 3 Kodiak 

20 1903 07 26 59.00 138.00 6 * 

21 1903 09 10 14 00 59.55 139.81 3 Yakutat 

22 1904 08 27 21 56 06 64.00 151.00 8.3 168 65.48 150.30 6 Rampart 

23 1904 09 10 65.48 150.30 3 Rampart 

24 1905 02 06 17 20 61.11 146.28 3 Valdez 

25 1905 08 60.11 149.41 3 Seward 

26 1905 11 23 10 00 61.11 146.28 3 Valdez 

27 1905 12 08 61.00 162.00 4 Onhagmute 

26 60.78 161.83 4 ·Bethel 

88 61.42 160.62 4 Ogavik (AKA Uknavik) 

28 1906 58.95 158.38 3 Nushagak 

Table 1-Earthquakes and Intensity Data 15 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

l~q. Date Time Epicenter Ma.g Dep !l Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec La.t 0 N Lon ow km km La.t oN Lon ow MM 

29 1907 09 24 13 58 00 59.50 135.25 6 59.46 135.31 5 Skagway 

35 59.40 135.83 4 Klukwan 

30 1907 12 29 66.00 168.00 6 * 

31 1908 02 14 11 25 61.00 146.25 12 61.11 146.28 6 Valdez 

10 61.08 146.35 5 Fort Liscurn 

27 60.89 146.70 5 Ellamar 

28 60.81 146.58 5 Landlocked Bay 

139 60.05 147.90 5 Latouche 

57 60.55 145.75 5 Cordova 

130 60.20 144.52 4 Kat alia 

32 1908 05 15 08 31 36.0 59.00 141.00 239 60.20 144.52 6 Kat alia 

491 60.11 149.41 3 Seward 

376 61.11 146.28 3 Valdez 

390 58.30 134.41 2 Juneau 

390 57.06 135.50 2 Sitka 

33 19Q8 10 29 60.50 144.00 60.50 144.00 6 Kat alia.-Northeast 

34 1908 11 02 60.50 144.00 60.50 144.00 6 Kat alia-Northeast 

35 1908 12 20 06 00 65.28 148.90 3 Hot Springs 

36 1909 02 16 59.38 135.33 5 Skagway 

59.55 139.81 5 Yakutat 

58.30 134.41 3 Juneau 

57.06 135.50 3 Sitka 

61.11 146.28 3 Valdez 

37 1909 05 06 59.50 139.50 18 59.55 139.81 5 Yakutat 

38 1909 07 16 59.55 139.81 3 Yakutat 

39 1911 09 22 05 01 24 60.50 149.00 6.9 60 76 60.97 147.99 9 Golden 

36 60.40 149.62 7 Kenai Lake 

163 61.11 146.28 6 Valdez 

40 1912 07 07 07 57 36 64.00 147.00 7.4 25 6 * 

41 1915 10 16 05 10 00.0 62.00 146.00 280 60.11 149.41 6 Seward 

42 1917 05 31 08 47 55.00 161.00 38 55.18 160.50 5 Unga 

43 1917 12 15 02 10 57.00 136.00 31 57.06 135.50 5 Sitka 

44 1920 06 26 02 41 65.00 148.00 22 64.85 147.71 5 Fairbanks 

45 1922 09 21 61.00 150.00 24 61.21 149.89 5 Anchorage 

46 1923 06 19 12 45 61.21 149.89 3 Anchorage 

47 1924 05 06 54.95 162.42 3 Fox Island 

48 1924 10 17 04 23 65.48 150.30 4 Rampart 

64.85 147.71 3 Fairbanks 

49 1924 11 29 05 26 59.38 135.33 4 Skagway 

50 1925 02 23 23 52 62.00 146.00 224 61.21 149.89 7 Anchorage 

132 60.86 146.68 6 Tatilek 

280 60.11 149.41 6 Seward 

51 1925 02 23 23 55 62.00 146.00 224 61.21 149.89 '1 Anchorage 

280 60.11 149.41 '1 Seward 

5 Alaska RR. (rni 356) 

100 61.11 146.28 5 Valdez 

132 60.86 146.68 5 Tatilek Village 

162 60.55 145.75 5 Cordova 

219 62.61 150.01 4 Curry 

240 60.05 147.90 4 Latouche 

329 64.85 147.71 4 Fairbanks 

16 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

!Eq. Date Time Epicenter Mag Dep 6 Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat. 0 N Lon °W km km Lat 0 N Lon °W MM 

51 1925 02 23 23 55 62.00 146.00 2 Alaska RR. (mi 52) 

159 60.60 146.60 2 Orca Bay 

175 61.43 142.92 2 McCarthy 

178 61.54 149.23 2 Matanuska 

205 60.78 148.87 2 Moraine 

661 59.18 135.38 2 Haines 

52 1925 02 24 00 10 60.86 146.68 2 Tatilek Village 

53 1925 02 24 00 17 60.86 146.68 2 Tatilek Village 

54 1925 02 24 00 36 60.86 146.68 2 Tatilek Village 

55 1925 02 24 01 37 60.86 146.68 2 Tatilek Village 

56 1925 02 24 02 01 60.86 146.68 2 Tatilek Village 

57 1925 02 24 04 53 60.86 146.68 2 Tatilek Village 

58 1925 02 24 09 59 60.86 146.68 2 Tatilek Village 

59 1925 02 24 12 61.21 149.89 2 Anchorage 

60 1925 02 24 13 00 60.00 148.00 8 60.05 147.90 6 Latouche 

61 1925 02 24 13 15 61.21 149.89 2 Anchorage 

62 1925 02 24 13 20 61.11 146.28 2 Valdez 

63 1925 02 24 13 45 61.50 149.00 13 61.54 149.23 5 Matanuska 

64 1925 02 24 14 so 60.05 147.90 2 Latouche 

65 1925 02 24 18 55 61.54 149.23 2 Matanuska 

66 1925 02 24 22 00 60.05 147.90 2 Latouche 

67 1925 02 25 09 59 60.86 146.68 2 Tatilek Village 

68 1925 02 25 10 10 61.11 146.28 2 Valdez 

69 1925 02 25 18 24 61.11 146.28 2 Valdez 

70 1925 02 25 18 25 61.21 149.89 2 Anchorage 

71 1925 02 25 18 49 61.11 146.28 2 Valdez 

72 1925 02 25 18 51 61.21 149.89 4 Anchorage 

73 1925 02 25 18 58 60.86 146.68 2 Tatilek Village 

74 1925 02 25 19 40 60.05 147.90 2 Latouche 

75 1925 02 25 20 00 60.05 147.90 2 Latouche 

76 1925 02 26 02 00 60.86 146.68 2 Tatilek Village 

77 1925 02 27 08 15 60.05 147.90 2 Latouche 

78 1925 02 27 11 45 60.05 147.90 2 Latouche 

79 1925 02 27 12 05 60.05 147.90 2 Latouche 

80 1925 OS 05 01 25 61.11 146.28 4 Valdez 

81 1925 OS 05 02 so 60.05 147.90 4 La touche 

82 1925 OS 11 01 05 61.11 146.28 2 Valdez 

83 1925 OS 11 02 25 60.55 145.75 2 Cordova 

84 1925 04 29 22 26 25 59.00 135.50 470 55.36 131.58 4 Ketchikan 

85 1925 08 10 00 09 58.30 134.41 3 Juneau 

86 1925 12 23 10 59 56.00 150.00 580 61.21 149.89 3 Anchorage 

87 1925 12 23 11 05 56.00 150.00 619 61.54 149.23 4 Matanuska 

88 1926 02 16 09 59 57.75 152.50 3 Kodiak 

89 1926 02 26 00 32 58.30 134.41 3 Juneau 

90 1926 04 09 23 13 58.30 134.41 3 Juneau 

91 1926 04 18 14 50 57.95 152.78 3 Whale Island 

92 1926 05 14 13 50 61.66 149.10 3 Matanuska Valley 

Table 1-Earthquakes and Intensity Data 17 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~ Date Time Epicenter Ma.g D<'p 6 Ohs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat. 0 N Lon ° W km km Lat. 0 N Lon °W MM 

93 1926 05 21 19 02 54 56.00 135.00 122 57.06 135.50 4 Sitka 

94 1926 05 21 19 03 57.06 135.50 4 Sitka 

95 1926 05 24 03 34 57.06 135.50 4 Sitka 

96 1926 05 25 03 35 57.06 135.50 4 Sitka 

97 1926 08 22 00 25 58.30 134.41 3 Juneau 

98 1926 08 28 08 00 60.55 145.75 3 Cordova 

99 1926 08 28 10 45 60.55 145.75 3 Cordova 

100 1926 09 11 06 15 64.85 147.71 3 Fairbanks 

101 1926 10 13 04 12 64.85 147.71 3 Fairbanks 

102 1926 10 14 12 00 61.21 149.89 3 Anchorage 

60.55 145.75 3 Cordova 

103 1926 10 14 13 05 61.21 149.89 3 Anchorage 

104 1926 11 14 60.11 149.41 3 Seward 

105 1926 11 15 04 21 06 64.20 14 7.00 5 Prince WiJiiam Sound Dist. 

465 60.05 147.90 5 Latouche 

412 60.55 145.75 4 Cordova 

464 60.20 144.52 3 Kat alia 

778 57.75 152.50 3 Kodiak 

106 1926 11 19 10 19 60.55 145.75 3 Cordova 

107 1926 12 08 20 45 61.21 149.89 3 Anchorage 

108 1926 12 30 53.88 166.53 3 Dutch Harbor 

109 1927 01 16 07 35 63.47 150.87 2 Wonder Lake 

110 1927 01 24 02 48 58.30 134.41 4 Juneau 

59.18 135.38 3 Haines 

59.38 135.33 3 Skagway 

111 1927 03 22 12 31 52.12 174.50 2 Atka Island 

112 1927 03 25 14 56.30 158.45 2 Chignik 

113 1927 03 30 07 55 36 62.00 150.00 279 60.55 145.75 4 Cordova 

114 1927 03 30 07 55 36 62.00 150.00 213 60.11 149.41 3 Seward 

115 1927 03 30 07 55 36 62.00 150.00 88 61.21 149.89 2 Anchorage 

470 58.01 152.76 2 Afognak 

116 1927 04 08 53.88 166.53 4 Dutch Harbor 

117 1927 04 09 53.88 166.53 4 Dutch Harbor 

118 1927 04 17 16 50 57.75 152.50 4 Kodiak 

57.95 152.78 2 Whale Island 

119 1927 05 31 20 09 61.21 149.89 2 Anchorage 

120 1927 06 30 05 50 59.18 135.38 2 Haines 

121 1927 07 08 03 60.11 149.41 2 Seward 

122 1927 10 24 15 59 55 57.50 137.00 7.1 25 6 Icy Straits 

74 58.13 136.58 6 Cross Sound 

93 58.25 136.32 6 lnian Island 

103 57.06 135.50 6 Sitka 

178 58.30 134.41 6 Juneau 

231 59.38 135.33 6 Skagway 

257 56.81 132.95 6 Petersburg 

300 56.51 132.40 6 Stikine River 

300 56.45 132.46 6 Wrangell 

606 60.55 145.75 4 Cordova 

411 55.36 131.58 '2 Ketchikan 

123 1927 10 24 18 04 58.30 134.41 2 Juneau 

18 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~· Date Time Epicenter Mag Dep A Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon ow MM 

124 1927 10 31 03 23 57.06 135.50 4 Sitka 

125 1927 11 12 21 56 56.40 136.00 232 58.30 134.41 4 Juneau 

80 57.06 135.50- 4 Sitka 

1076 59.00 153.38 3 Shaw Island 

334 59.38 135.33 3 Skagway 

312 59.18 135.38 2 Haines 

126 1927 11 19 10 10 60.55 145.75 2 Cordova 

127 1927 11 21 15 13 50 56.40 136.00 80 57.06 135.50 5 Sitka 

232 58.30 134.41 4 Juneau 

128 1927 11 21 16 14 57.00 136.00 173 58.30 134.41 5 Juneau 

31 57.06 135.50 5 Sitka 

129 1927 11 23 09 36 64.85 147.71 2 Fairbanks 

130 1927 11 25 11 40 64.85 147.71 2 Fairbanks 

131 1927 12 09 60.40 149.62 5 Kenai Lake 

132 1927 12 31 19 06 45 56.40 136.00 80 57.06 135.50 4 Sitka 

232 58.30 134.41 4 Juneau 

312 59.18 135.38 2 Haines 

133 1927 12 31 20 07 59.18 135.38 5 Haines 

58.30 134.41 5 Juneau 

57.06 135.50 5 Sitka 

.. 

134 1928 01 23 04 00 60.05 147.90 3 Latouche 

135 1928 01 25 02 35 60.00 150.00 35 60.11 149.41 6 Seward 

136 1928 02 02 01 08 59.00 135.00 30 59.18 135.38 3 Haines 

93 58.31 134.10 3 Annex Creek 

137 1928 02 07 06 03 61.00 149.00 53 61.21 149.89 5 Anchorage 

61 61.54 149.23 5 Matanuska 

122 60.05 147.90 5 Latouche 

102 60.11 149.41 3 Seward 

138 1928 02 08 06 50 60.00 150.00 35 60.11 149.41 3 Seward 

139 1928 02 19 21 08 61.00 147.00 165 60.11 149.41 5 Seward 

140 1928 02 20 60.11 149.41 3 Seward 

141 1928 02 20 10 00 60.05 147.90 3 Latouche 

142 1928 02 20 22 42 60.05 147.90 4 Latouche 

143 1928 03 02 14 35 61.00 149.00 53 61.21 149.89 3 Anchorage 

144 1928 04 06 15 15 60.00 150.00 35 60.11 149.41 3 Seward 

145 1928 04 10 14 09 60.00 150.00 35 60.11 149.41 4 Seward 

146 1928 04 19 12 03 56.00 160.00 1100 65.46 165.78 2 Igloo 

147 1928 04 19 14 00 56.00 160.00 1100 65.46 165.78 2 Igloo 

148 1928 04 27 02 45 59.18 135.38 3 Haines 

149 1928 05 15 10 00 50.00 179.00 F Japanese Steamer 

150 1928 06 08 10 30 60.00 146.00 63 60.55 145.75 5 Cordova 

151 1928 06 20 19 00 60.11 149.41 3 Seward 

152 1928 06 21 16 27 13.0 60.00 146.50 7.0 25 74 60.55 145.75 6 Cordova 

162 60.11 149.41 4 Seward 

229 61.21 149.89 3 Anchorage 

226 61.79 148.46 3 Chickaloon 

117 60.98 145.75 3 Cordova ( 30 mi N. of} 

227 61.54 149.23 3 Matanuska 

124 61.11 146.28 3 Valdez 

153 1928 10 30 06 43 61.00 149.00 122 60.05 147.90 3 Latouche 

Table !-Earthquakes and Intensity Data 19 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

!Eq. Date Time Epicent.er Mag Dep ~ Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon ow MM 

154 1928 10 30 07 13 61.00 149.00 53 61.21 149.89 3 Anchorage 

61 I 61.54 149.23 3 Matanuska 

155 1928 11 13 07 25 61.00 149.00 53 61.21 149.89 3 Anchorage 

156 1928 11 27 21 20 60.00 148.00 8 60.05 147.90 3 Latouche 

157 1928 12 04 16 37 54.00 166.00 37 53.88 166.53 3 Dutch Harbor 

158 1928 12 19 07 50 61.00 146.00 158 61.79 148.46 3 Chickaloon 

159 1928 12 24 10 35 65.00 148.00 22 64.85 147.71 3 Fairbanks 

160 1929 01 10 05 15 00 54.00 161.00 437 53.41 167.55 3 Chernofski Harbor 

161 1929 01 16 17 30 54.00 161.00 437 53.41 167.55 3 Chernofski Harbor 

162 1929 01 18 05 16 00 58.00 152.00 110 57.33 153.36 3 Kodiak Island 

163 1929 01 20 22 24 00 62.00 148.00 34 61.79 148.46 3 Chickaloon 

164 1929 01 21 10 30 53 64.00 148.00 6.3 25 96 64.85 147.71 6 Fairbanks 

51 63.90 149.02 3 Lignite 

91 64.58 149.33 3 Nenana 

185 62.61 150.01 3 Curry 

238 65.18 152.16 3 Tanana· 

326 61.21 149.89 3 Anchorage 

332 64.76 141.33 3 Eagle 

402 60.55 145.75 3 Cordova 

165 1929 01 25 18 00 00 61.11 146.28 3 Valdez 

166 1929 02 26 09 00 42 54.00 163.00 99 54.86 163.40 3 False Pass 

167 1929 03 03 09 04 00 57.00 136.00 31 57.06 135.50 4 Sitka 

168 1929 03 07 01 34 39 51.00 170.00 8.6 50 398 53.88 166.53 5 Dutch Harbor 

169 1929 04 06 04 50 00 62.00 149.00 53 61.54 149.23 4 Matanuska 

170 1929 04 06 10 33 00 62.00 149.00 53 61.54 149.23 5 Matanuska 

171 1929 04 06 16 05 00 61.54 149.23 3 Matanuska 

172 1929 05 26 22 39 54 51.00 131.00 7.0 548 55.90 130.16 3 Hyder 

345 54.02 132.15 7 Masset, B.C. (North end) 

173 1929 07 03 00 53 00 62.50 149.00 6.3 25 151 61.21 149.89 3 Anchorage 

174 1929 07 04 05 22 00 64.00 141.00 86 64.76 141.33 3 Eagle 

175 192~ 08 19 17 40 00 58.00 153.00 31 57.93 152.50 5 Uzinki (is now Ouzinki) 

176 1929 09 21 20 00 00 58.00 150.00 165 57.95 152.78 3 Whale Island 

177 1929 09 26 19 15 00 61.00 146.00 19 61.11 146.28 3 Valdez 

178 1929 11 12 05 45 00 58.30 134.41 5 Juneau 

179 1929 11 27 01 55 00 61.00 146.00 19 61.11 146.28 3 Valdez 

180 1929 11 27 02 40 00 61.11 146.28 3 Valdez 

181 1930 01 12 11 46 62.00 146.50 153 61.54 149.23 3 Matanuska 

182 1930 01 23 00 30 57.50 152.00 68 57.95 152.78 3 Whale Island 

73 58.01 152.76 3 Afognak 

84 57.33 153.36 3 Kodiak Island 

183 1930 02 21 01 15 61.54 149.23 3 Matanuska 

184 1930 02 28 06 41 64.85 147.71 3 Fairbanks 

185 1930 02 28 16 38 65.50 147.00 80 64.85 147.71 3 Fairbanks 

186 1930 03 09 21 30 53.50 167.00 38 53.41 167.55 3 Chernofski Harbor 

187 1930 03 22 19 50 64.85 147.71 3 Fairbanks 

188 1930 04 01 11 28 64.85 147.71 3 Fairbanks 

189 1930 04 20 10 15 64.85 147.71 5 Fairbanks 

190 1930 04 23 54.75 165.00 3 Unimak Island 

20 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~~- Date Time Epicenter Mag Dep !:i Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat. 0 N Lon °W MM 

191 1930 04 30 04 55 60.00 149.00 26 60.11 149.41 3 Seward 

192 1930 05 14 07 28 57.95 152.78 3 Whale Island 

193 1930 05 26 16 46 61.54 149.23 3 Matanuska 

194 1930 05 26 20 12 61.54 149.23 3 Matanuska 

195 1930 06 18 05 55 56.50 158.50 22 56.30 158.45 3 Chignik 

196 1930 06 21 06 45 64.85 147.71 3 Fairbanks 

197 1930 06 25 08 05 61.54 149.23 3 Matanuska 

198 1930 08 03 01 13 64.85 147.71 3 Fairbanks 

199 1930 08 13 01 20 61.54 149.23 3 Matanuska 

200 1930 08 15 22 50 64.85 147.71 4 Fairbanks 

201 1930 09 29 06 05 60.11 149.41 3 Seward 

202 1930 10 01 15 30 58.50 136.50 124 58.30 134.41 3 Juneau 

203 1930 10 25 11 40 62.00 157.00 39 61.66 157.18 3 Sleetmute 

204 1930 11 02 16 40 56.30 158.45 3 Chignik 

205 1930 12 09 02 30 65.00 145.00 56 65.48 144.63 3 Circle Hot Springs 

206 1930 12 09 06 15 65.48 144.63 3 Circle Hot Springs 

207 1930 12 25 04 58 57.95 152.78 3 Whale Island 

208 1930 12 26 12 59 57.75 152.50 3 Kodiak 

209 1930 12 31 19 41 64.85 147.71 3 Fairbanks 

210 1931 01 03 05 30 60.38 151.35 3 Kasilof 

61.54 149.23 3 Matanuska 

60.11 149.41 3 Seward 

211 1931 01 08 15 30 64.58 149.33 3 Nenana 

212 1931 01 23 04 40 61.54 149.23 3 Matanuska 

213 1931 01 27 13 40 61.54 149.23 3 Matanuska 

214 1931 01 27 14 29 03 60.75 149.00 5.6 75 60.11 149.41 3 Seward 

215 1931 01 27 15 32 60.55 145.75 3 Cordova 

216 1931 01 27 16 00 61.54 149.23 3 Matanuska 

217 1931 01 28 02 30 60.38 151.35 3 Kasilof 

218 1931 01 31 21 15 60.60 145.70 3 Cordova (mi 7.0) 

219 1931 03 22 16 30 61.54 149.23 3 Matanuska 

220 1931 03 23 21 30 61.54 149.23 3 Matanuska 

221 1931 03 30 11 15 60.11 149.41 3 Seward 

222 1931 04 29 14 30 57.33 153.36 3 Kodiak Island 

56.89 154.24 3 Lazy Bay 

223 1931 05 13 07 03 57.95 152.78 3 Whale Island 

224 1931 05 13 07 51 57.95 152.78 3 Whale Island 

225 1931 05 13 08 26 61.54 149.23 3 Matanuska 

226 1931 05 15 01 00 61.54 149.23 3 Matanuska 

227 1931 05 24 15 00 57.95 152.78 3 Whale Island 

228 1931 05 28 06 15 60.60 145.70 3 Cordova (mi 7.0) 

229 1931 05 29 05 16 32 63.00 149.00 5.6 229 60.95 149.30 5 Girdwood 

163 61.54 149.23 3 Matanuska 

230 1931 05 30 10 00 53.00 173.00E 6.0 18 52.94 173.25E 6 Attu 

231 1931 06 02 02 00 60.95 149.30 3 Girdwood 

232 1931 06 11 22 40 61.50 144.52 5 Chitina 

61.11 146.28 5 Valdez 

Table 1-Earthquakes and Intensity Data 21 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

IEq Date Time Epicenter Mag Dep ~ Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat. 0 N Lon ow MM 

232 1931 06 11 22 40 60.55 145.75 4 Cordova 

60.95 149.30 4 Girdwood 

65.83 144.18 3 Circle 

60.91 149.75 3 Hope 

233 1931 06 13 14 15 61.50 144.52 3 Chitina 

234 1931 06 20 13 40 59.63 151.55 3 Homer 

235 1931 06 21 15 45 59.63 151.55 3 Homer 

236 1931 06 28 05 35 62.33 150.11 5 Talkeetna 

237 1931 07 01 23 31 60.95 149.30 3 Girdwood 

238 1931 07 06 22 04 57.50 156.00 7 57.56 156.03 5 Kanatak 

239 1931 07 13 12 30 60.50 149.00 53 60.95 149.30 5 Girdwood 

22 60.48 149.40 3 Moose Pass 

61 60.91 149.75 3 Hope 

240 1931 07 14 03 45 60.91 149.75 3 Hope 

60.48 149.40 3 Moose Pass 

241 1931 07 16 12 15 60.91 149.75 3 Hope 

242 1931 07 18 11 55 60.95 149.30 3 Girdwood 

243 1931 08 13 09 36 58.41 135.83 3 Gustavus 

244 1931 08 23 11 50 60.95 149.30 3 Girdwood 

59.63 151.55 3 Homer 

245 1931 09 11 15 55 57.95 152.78 3 Whale Island 

246 1931 09 15 07 15 63.52 150.95 3 Kantishna 

247 1931 10 12 14 15 59.63 151.55 3 Homer 

248 1931 10 17 61.48 142.88 3 Kennicott 

249 1931 10 17 10 30 61.11 146.28 3 Valdez 

250 1931 10 17 12 34 50 63.00 147.00 5.6 205 61.58 149.50 5 Wasilla 

258 60.95 149.30 5 Girdwood 

448 59.63 151.55 3 Homer 

251 1931 10 20 11 00 60.95 149.30 3 Girdwood 

252 1931 10 26 10 10 59.63 151.55 3 Homer 

253 1931 10 27 13 55 60.95 149.30 3 Girdwood 

254 1931 11 04 11 00 64.58 149.33 3 Nenana 

255 1931 11 20 10 30 60.95 149.30 5 Girdwood 

61.11 146.28 5 Valdez 

256 1931 11 20 11 08 60.95 149.30 3 Girdwood 

59.63 151.55 3 Homer 

257 1931 11 20 11 10 61.21 149.89 3 Anchorage 

258 1931 11 20 11 20 61.54 149.23 3 Matanuska 

259 1931 11 20 20 30 61.21 149.89 3 Anchorage 

61.54 149.23 3 Matanuska 

260 1931 11 21 14 28 00 60.50 149.00 53 60.95 149.30 5 Girdwood 

261 1931 11 22 00 14 60.95 149.30 4 Girdwood 

262 1931 11 25 19 55 59.63 151.55 3 Homer 

263 1931 11 26 07 30 57.95 152.78 3 Whale Island 

264 1931 11 27 18 20 64.85 147.71 3 Fairbanks 

265 1931 11 29 11 26 60.95 149.30 3 Girdwood 

266 1931 12 03 1118 61.43 142.92 4 McCarthy 

267 1931 12 05 13 49 60.95 149.30 3 Girdwood 

22 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

r.q. Dat.e Time Epicenter Ma.g Dep ~ Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

268 1931 12 06 21 20 53.88 166.53 s Dutch Harbor 

269 19Sl 12 17 IS so 59.63 151.55 s Homer 

270 1931 12 24 03 40 40 60.00 152.00 6.3 100 48 59.63 151.55 4 Homer 

182 60.95 149.30 4 Girdwood 

228 61.54 149.23 4 Matanuska 

233 57.95 152.78 4 Whale Island 

308 60.89 146.70 4 Ellamar 

337 61.11 146.28 4 Valdez 

358 57.56 156.03 4 Kanatak 

271 1932 01 10 OS 40 64.85 147.71 s Fairbanks 

272 1932 01 10 11 29 60.95 149.30 s Girdwood 

273 19S2 01 12 02 30 61.11 146.28 s Valdez 

274 1932 01 12 02 52 60.95 149.30 4 Girdwood 

275 1932 01 14 2S 4S 58.01 152.76 s Afognak 

57.95 152.78 s Whale Island 

276 1932 01 18 22 12 60.95 149.30 s Girdwood 

277 1932 01 24 14 08 60.95 149.30 s Girdwood 

278 1932 01 24 14 30 59.63 151.55 s Homer 

279 19S2 01 24 15 21 59.63 151.55 s Homer 

280 1932 01 24 15 35 60.95 149.30 s Girdwood 

60.11 149.41 3 Seward 

281 1932 01 27 02 20 58.01 152.76 3 Afognak 

57.95 152.78 3 Whale Island 

282 1932 02 08 06 10 59.42 136.22 3 Porcupine Creek 

283 1932 02 08 12 00 60.95 149.30 s Girdwood 

284 1932 02 IS 15 47 60.95 149.30 3 Girdwood 

285 1932 02 15 13 00 60.95 149.30 s Girdwood 

286 1932 02 21 08 51 60.95 149.30 3 Girdwood 

287 1932 02 24 10 59.18 135.38 3 Haines 

59.42 136.22 s Porcupine Creek 

288 19S2 02 24 19 16 58.30 134.41 s Juneau 

289 1932 03 01 19 S5 60.95 149.30 s Girdwood 

290 1932 03 03 12 Sl 60.50 149.00 53 60.95 149.30 5 Girdwood 

291 1932 03 04 09 34 63.50 150.00 5 McKinley N atl. Park 

292 19S2 03 08 0115 64.58 149.33 3 Nenana 

293 1932 03 25 23 58 Sl 62.50 152.50 6.9 25 314 60.11 149.41 7 Seward 

242 60.95 149.30 4 Girdwood 

3 Lakotna 

187 61.58 149.50 3 Wasilla 

396 62.66 160.20 s Anvik 

485 58.75 157.00 3 Naknek 

504 59.05 158.50 s Dillingham 

294 1932 03 26 00 03 60.60 145.70 s Cordova (mi 7.0) 

295 1932 03 26 08 42 61.21 149.89 s Anchorage 

60.95 149.30 s Girdwood 

296 1932 03 30 04 S5 60.95 149.30 s Girdwood 

297 19S2 04 01 OS 06 60.95 149.30 4 Girdwood 

298 1932 04 19 20 10 57.95 152.78 s Whale Island 

299 19S2 04 21 12 14 64.85 147.71 5 Fairbanks 

Table 1-Earthquakes and Intensity Data 23 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~· Date Time Epicenter Mag Pep ll Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

300 1932 04 26 21 10 58.31 134.10 3 Annex Creek 

301 1932 05 2'1 0'1 30 59.42 136.22 3 Porcupine Creek 

302 1932 06 02 21 05 57.95 152.78 3 Whale Island 

303 1932 06 05 23 01 60.95 149.30 3 Girdwood 

304 1932 06 06 06 22 60.95 149.30 3 Girdwood 

305 1932 06 06 0'1 33 60.95 149.30 4 Girdwood 

306 1932 06 06 0'1 40 60.95 149.30 3 Girdwood 

307 1932 06 0'1 0'1 25 60.11 149.41 3 Seward 

308 1932 06 08 04 53 36.0 63.00 155.00 59 63.00 156.16 3 Takotna 

309 1932 06 08 09 00 62.16 159.88 3 Holy Cross 

310 1932 09 01 13 00 59.63 151.55 4 Homer 

311 1932 09 03 04 30 59.63 151.55 3 Homer 

312 19S2 09 14 08 4S 23 61.00 148.00 6.S 50 71 60.89 146.70 5 Ellamar 

94 61.11 146.28 5 Valdez 

103 61.58 149.50 5 Wasilla 

248 59.63 151.55 5 Homer 

313 1932 10 03 18 so 61.85 148.06 3 Anthracite Camp 

314 19S2 10 06 15 40 59.48 151.75 3 Seldovia 

315 19S2 10 06 16 49 59.63 151.55 s Homer 

316 19S2 10 06 1'1 05 59.50 151.50 15 59.63 151.55 5 Homer 

317 1932 10 12 14 30 59.48 151.75 s Seldovia 

318 1932 10 12 15 00 59.63 151.55 s Homer 

319 1932 11 1'1 22 30 61.54 150.51 s Susitna 

320 1932 11 19 10 64.86 147.80 3 College 

321 19S2 12 06 04 00 61.54 150.51 s Susitna 

322 1932 12 10 03 05 57.06 135.50 3 Sitka 

323 1933 01 04 OS 59 28.0 61.00 148.00 6.S 25 126 60.11 149.41 6 Seward·' 

103 61.58 149.50 4 Wasilla 

104 61.21 149.89 4 Anchorage 

111 60.40 149.62 4 Kenai Lake 

147 61.54 150.51 4 Susitna 

277 61.43 142.92 4 McCarthy 

s Turnagain Arm Route 

71 60.89 146.70 s Ellamar 

132 60.55 145.75 s Cordova 

248 59.63 151.55 3 Homer 

429 64.85 147.71 s Fairbanks 

324 19SS 01 04 04 30 61.00 148.00 91 61.79 148.46 s Chickaloon 

325 193S 01 1'1 10 08 59.63 151.55 s Homer 

326 193S OS 02 61.54 150.51 s Susitna 

327 193S OS 02 22 so 59.55 139.81 3 Yakutat 

328 193S OS 1 '1 15 20 59.55 139.81 s Yakutat 

329 1933 03 18 08 30 61.54 150.51 3 Susitna 

330 19SS 03 19 08 20 58.30 134.41 s Juneau 

331 193S OS 21 07 45 61.11 146.28 s Valdez 

332 193S 03 28 04 20 26 58.25 149.00 5.6 223 58.01 152.76 s Afognak 

225 57.95 152.78 3 Whale Island 

333 1933 04 02 18 26 59.63 151.55 3 Homer 

334 19S3 04 19 06 40 58.01 152.76 3 Afognak 

24 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~Eq. Date Time Epicenter Mag Dep A Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W ~M 

334 1933 04 19 06 40 57.95 152.78 3 Whale Island 

335 1933 04 22 17 17 58.01 152.76 3 Afognak 

57.95 152.78 3 Whale Island 

336 1933 04 26 20 28 53.88 168.26 3 Aleutian Islands 

53.88 166.53 3 Dutch Harbor 

337 1933 04 27 58.01 152.76 3 Afognak 

61.54 150.51 3 Susitna 

57.95 152.78 3 Whale Island 

338 1933 04 27 02 36 04 61.25 150.75 7.0 25 8 61.25 150.60 7 Big Susitna River Dist. 

37 61.04 151.28 7 Old Tyonek 

46 61.21 149.89 6 Anchorage 

1331 53.88 168.26 5 Aleutian Islands 

461 57.33 153.36 5 Kodiak Island 

156 62.61 150.01 4 Curry 

495 59.05 158.50 4 Dillingham 

102 60.38 151.35 4 Kasilof 

320 62.97 155.67 4 McGrath 

147 60.11 149.41 4 Seward 

76 61.58 149.50 4 Wasilla 

429 64.86 147.80 3 College 

430 64.85 147.71 3 Fairbanks 

301 63.83 149.02 3 Healy 

186 59.63 151.55 3 Homer 

35 61.54 150.51 3 Susitna 

241 61.11 146.28 3 Valdez 

385 57.95 152.78 3 Whale Island 

339 1933 04 27 02 45 58.01 152.76 4 Afognak 

57.95 152.78 4 Whale Island 

60.11 149.41 3 Seward 

340 1933 04 27 03 03 59.50 151.50 15 59.63 151.55 5 Homer 

341 1933 04 27 03 13 60.11 149.41 3 Seward 

342 1933 04 27 03 29 61.43 142.92 4 McCarthy 

61.54 150.51 3 Susitna 

343 1933 04 27 03 37 60.60 145.70 3 Cordova (mi 7.0) 

59.63 151.55 3 Homer 

61.54 150.51 3 Susitna 

344 1933 04 27 03 50 60.60 145.70 3 Cordova (mi 7.0) 

61.54 150.51 3 Susitna 

345 1933 04 27 04 10 59.63 151.55 3 Homer 

346 1933 04 27 04 50 61.00 150.00 24 61.21 149.89 5 Anchorage 

347 1933 04 27 09 00 59.63 151.55 3 Homer 

348 1933 04 27 13 30 61.21 149.89 5 Anchorage 

349 1933 04 27 14 30 61.21 149.89 5 Anchorage 

350 1933 04 27 21 55 61.21 149.89 5 Anchorage 

351 1933 04 27 22 20 53.88 166.53 3 Dutch Harbor 

352 1933 04 28 58.01 152.76 3 Afognak 

57.95 152.78 3 Whale Island 

353 1933 04 28 02 55 61.21 149.89 5 Anchorage 

354 1933 04 28 07 15 61.21 149.89 5 Anchorage 

355 1933 04 28 07 35 59.63 151.55 3 Homer 

356 1933 04 28 10 05 61.54 150.51 3 Susitna 

Table 1-Earthquakes and Intensity Data 25 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~· Date Time Epicenter Mag Dep /::::,. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat. 0 N Lon °W km km Lat 0 N Lon °W MM 

357 1933 04 28 12 32 61.21 149.89 3 Anchorage 

358 1933 04 28 19 06 61.54 150.51 3 Susitna 

359 1933 04 28 19 12 61.54 150.51 3 Susitna 

360 1933 04 28 20 27 61.54 150.51 3 Susitna 

361 1933 04 29 00 25 61.54 150.51 3 Susitna 

362 1933 04 29 02 04 61.54 150.51 3 Susitna 

363 1933 04 29 12 30 61.21 149.89 3 Anchorage 

364 1933 04 29 14 05 61.54 150.51 3 Susitna 

365 1933 04 29 17 20 61.54 150.51 3 Susitna 

366 1933 04 29 20 10 61.54 150.51 3 Susitna 

367 1933 04 29 23 07 61.54 150.51 3 Susitna 

368 1933 04 30 01 25 61.54 150.51 3 Susitna 

369 1933 04 30 01 45 61.54 150.51 3 Susitna 

370 1933 04 30 01 51 61.54 150.51 3 Susitna 

371 1933 04 30 02 22 61.54 150.51 3 Susitna 

372 1933 04 30 03 43 61.21 149.89 3 Anchorage 

373 1933 04 30 11 30 61.21 149.89 3 Anchorage 

374 1933 04 30 12 20 61.54 150.51 3 Susitna 

375 1933 05 01 10 06 61.54 150.51 3 Susitna 

376 1933 05 01 15 15 60.11 149.41 3 Seward 

377 1933 05 01 21 53 61.21 149.89 3 Anchorage 

378 1933 05 01 22 05 61.54 150.51 3 Susitna 

379 1933 05 02 61.21 149.89 3 Anchorage 

380 1933 05 02 00 45 61.54 150.51 3 Susitna 

381 1933 05 02 04 00 61.54 150.51 3 Susitna 

382 1933 05 02 06 32 58.01 152.76 3 Afognak 

57.95 152.78 3 Whale Island 

383 1933 05 02 07 00 61.54 150.51 3 Susitna 

384 1933 05 03 09 00 60.11 149.41 3 Seward 

385 1933 05 03 12 30 61.21 149.89 3 Anchorage 

61.54 150.51 3 Susitna 

386 1933 05 03 12 35 61.21 149.89 3 Anchorage 

61.54 150.51 3 Susitna 

387 1933 05 04 61.21 149.89 3 Anchorage 

60.38 151.35 3 Kasilof 

388 1933 05 04 00 35 61.54 150.51 3 Susitna 

389 1933 05 04 02 15 61.21 149.89 5 Anchorage 

390 1933 05 04 02 25 61.54 150.51 3 Susitna 

391 1933 05 04 13 01 61.54 150.51 3 Susitna 

392 1933 05 05 61.21 149.89 3 Anchorage 

393 1933 05 05 17 55 61.54 150.51 3 Susitna 

394 1933 05 06 04 40 61.54 150.51 3 Susitna 

395 1983 05 06 05 40 61.54 150.51 3 Susitna 

396 1933 05 06 06 15 61.54 150.51 3 Susitna I 

397 1933 05 06 18 40 61.54 150.51 3 Susitna 

398 1933 05 06 23 30 61.54 150.51 3 Susitna 

399 1933 05 07 18 35 61.54 150.51 3 Susitna 

26 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~ Date Time Epicent.er Mag Dep !::,. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km La.t 0 N Lon °W MM 

400 1933 05 07 23 05 61.54 150.51 3 Susitna 

401 1933 05 08 05 00 61.54 150.51 3 Susitna 

402 1933 05 08 05 25 61.54 150.51 3 Susitna 

403 1933 05 13 61.04 151.28 3 Old Tyonek 

60.11 149.41 3 Seward 

404 1933 05 15 03 00 fi0.11 149.41 3 Seward 

405 1933 05 15 16 35 61.54 150.51 3 Susitna 

406 1933 05 16 08 30 60.11 149.41 3 Seward 

407 1933 05 18 61.21 149.89 3 Anchorage 

408 1933 05 19 22 10 66.56 152.68 3 Allakaket 

409 1933 05 22 14 04 60.11 149.41 3 Seward 

410 1933 05 23 07 10 61.21 149.89 3 Anchorage 

60.11 149.41 3 Seward 

411 1933 05 25 16 25 61.21 149.89 3 Anchorage 

60.11 149.41 3 Seward 

412 1933 06 12 01 50 59.63 151.55 3 Homer 

413 1933 06 12 15 06 59.63 151.55 3 Homer 

414 1933 06 12 15 23 38.0 61.50 150.50 5.6 4 61.54 150.51 3 Susitna 

166 60.11 149.41 3 Seward 

216 59.63 151.55 3 Homer 

415 1933 06 13 59.63 151.55 3 Homer 

416 1933 06 13 16 07 60.11 149.41 3 Seward 

417 1933 06 13 22 19 47.0 61.00 151.00 6.3 25 132 60.11 149.41 s Seward 

162 61.79 148.46 s Chickaloon 

156 59.63 151.55 3 Homer 

418 1933 06 14 61.21 149.89 3 Anchorage 

419 1933 06 15 22 40 61.21 149.89 3 Anchorage 

61.54 150.51 s Susitna 

420 1933 06 16 60.38 151.35 3 Kasilof 

421 1933 06 17 60.38 151.35 s Kasilof 

422 1933 06 17 08 55 60.11 149.41 s Seward 

423 1933 06 17 22 11 60.11 149.41 s Seward 

424 1933 06 19 60.38 151.35 3 Kasilof 

425 1933 06 19 18 so 59.63 151.55 4 Homer 

426 1933 06 19 18 47 43.0 61.25 150.50 6.0 25 32 61.54 150.51 3 Susitna 

140 60.11 149.41 3 Seward 

427 1933 06 19 19 02 60.11 149.41 3 Seward 

428 1933 06 28 09 57 53.50 165.00 93 53.80 166.31 s Fox Islands 

429 1933 06 28 10 25 59.48 151.75 3 Seldovia 

430 1933 06 28 12 05 59.63 151.55 3 Homer 

431 1933 06 28 23 34 58.0 53.50 165.00 6.0 25 93 53.80 166.31 3 Fox Islands 

432 1933 06 29 02 26 42.0 53.50 165.00 93 53.80 166.31 3 Fox Islands 

433 1933 07 28 11 49 54.00 166.00 37 53.88 166.53 5 Dutch Harbor 

434 1933 08 Sl 02 51 40.0 59.25 137.50 5.3 121 59.18 135.38 5 Haines 

124 59.38 135.33 5 Skagway 

208 58.30 134.41 4 Juneau 

435 1933 08 Sl 14 00 64.76 141.33 3 Eagle 

436 1933 09 19 23 39 32.0 60.00 138.00 5.6 165 59.38 135.33 4 Skagway 

Table !-Earthquakes and Intensity Data 27 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

tEq. Da.t.e Time Epicent.er Mag Dep l:l. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon ow km km Lat 0 N Lon °W MM 

436 1933 09 19 23 39 32.0 60.00 138.00 5.6 279 58.30 134.41 4 Juneau 

437 1933 09 20 04 55 59.63 151.55 2 Homer 

438 1933 09 24 62.14 153.52 3 Post River Lake 

439 1933 09 24 17 43 61.21 149.89 3 Anchorage 

440 1933 09 27 05 20 61.21 149.89 3 Anchorage 

441 1933 09 27 09 00 61.21 149.89 3 Anchorage 

442 1933 09 29 03 00 61.21 149.89 3 Anchorage 

443 1933 10 11 18 25 59.63 151.55 3 Homer 

444 1933 11 06 09 15 60.11 149.41 3 Seward 

445 1933 11 07 15 30 60.55 145.75 3 Cordova 

446 1933 11 11 21 15 59.63 151.55 3 Homer 

447 1933 11 24 09 55 59.63 151.55 3 Homer 

448 1933 11 28 09 25 59.63 151.55 3 Homer 

449 1933 12 05 17 25 60.11 149.41 3 Seward 

450 1933 12 18 05 27 58.30 134.41 3 Juneau 

451 1933 12 29 21 55 59.63 151.55 3 Homer 

452 1934 01 15 10 40 61.21 149.89 3 Anchorage 

453 1934 01 19 01 55 61.54 150.51 3 Susitna 

454 1934 01 19 02 47 59.63 151.55 4 Homer 

455 1934 01 20 01 41 60.11 149.41 3 Seward 

456 1934 01 20 10 15 61.54 150.51 3 Susitna 

457 1934 01 25 19 02 61.21 149.89 4 Anchorage 

61.54 150.51 4 Susitna 

458 1934 02 11 07 35 61.21 149.89 3 Anchorage 

459 1934 02 12 02 30 61.21 149.89 3 Anchorage 

460 1934 02 12 07 50 58.00 134.50 34 58.30 134.41 5 Juneau 

461 1934 03 06 07 30 60.11 149.41 3 Seward 

462 1934 03 20 19 45 58.01 152.76 3 Afognak 

57.95 152.78 3 Whale Island 

463 1934 03 26 18 15 61.54 150.51 3 Susitna 

464 1934 03 30 03 30 59.63 151.55 3 Homer 

465 1934 03 30 03 42 61.21 149.89 4 Anchorage 

466 1934 03 30 03 56 61.54 150.51 3 Susitna 

467 1934 03 30 04 07 61.21 149.89 4 Anchorage 

468 1934 04 02 23 20 61.21 149.89 3 Anchorage 

469 1934 04 03 10 40 61.21 149.89 4 Anchorage 

470 1934 04 03 16 20 60.11 149.41 4 Seward 

61.21 149.89 3 Anchorage 

471 1934 04 06 23 55 61.21 149.89 3 Anchorage 

472 1934 04 07 05 52 61.54 150.51 3 Susitna 

473 1934 04 08 01 43 61.21 149.89 3 Anchorage 

474 1934 04 08 02 38 61.21 149.89 3 Anchorage 

475 1934 04 08 02 45 61.21 149.89 3 Anchorage 

476 1934 04 10 03 35 58.01 152.76 3 Afognak 

57.75 152.50 3 Kodiak 

57.95 152.78 3 Whale Island 

477 1934 04 10 20 34 61.21 149.89 3 Anchorage 

28 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~· Date Time Epicenter Mag IIJep ll Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

478 1934 04 13 20 03 61.21 149.89 3 Anchorage 

479 1934 04 19 18 52 61.00 150.00 24 61.21 149.89 5 Anchorage 

104 60.11 149.41 3 Seward 

480 1934 04 19 23 58 61.21 149.89 3 Anchorage 

481 1934 04 21 20 59 61.21 149.89 3 Anchorage 

482 1934 04 24 03 47 61.54 150.51 3 Susitna 

483 1934 04 24 04 07 61.21 149.89 3 Anchorage 

59.63 151.55 3 Horner 

57.06 135.50 3 Sitka 

484 1934 04 28 03 51 61.54 150.51 3 Susitna 

485 1934 04 29 10 00 61.54 150.51 4 Susitna 

486 1934 05 04 04 10 61.54 150.51 4 Susitna 

487 1934 05 04 04 36 07 61.25 147.50 7.2 80 128 61.21 149.89 6 Anchorage 

123 60.55 145.75 5 Cordova 

246 61.43 142.92 5 McCarthy 

248 61.48 142.88 5 Kennicott 

430 60.14 155.05 5 Long Lake 

164 60.11 149.41 4 Seward 

231 60.38 151.35 4 Kasilof 

286 63.73 148.91 4 McKinley Park 

287 59.63 151.55 4 Horner 

383 64.58 149.33 4 Nenana 

401 64.85 147.71 4 Fairbanks 

488 1934 05 04 08 10 61.21 149.89 3 Anchorage 

489 1934 05 04 09 00 60.55 145.75 3 Cordova 

490 1934 05 04 09 30 59.63 151.55 3 Horner 

60.11 149.41 3 Seward 

491 1934 05 04 11 15 61.21 149.89 3 Anchorage 

57.06 135.50 3 Sitka 

492 1934 05 04 12 00 60.55 145.75 3 Cordova 

493 1934 05 04 13 15 61.21 149.89 3 Anchorage 

494 1934 05 05 12 35 61.21 149.89 3 Anchorage 

60.55 145.75 3 Cordova 

495 1934 05 14 01 17 61.21 149.89 3 Anchorage 

496 1934 05 14 09 54 61.21 149.89 3 Anchorage 

497 1934 05 14 16 43 61.21 149.89 3 Anchorage 

498 1934 05 14 20 16 58.01 152.76 4 Afognak 

57.75 152.50 4 Kodiak 

59.63 151.55 3 Horner 

499 1934 05 14 22 12 46 57.75 152.25 6.5 60 15 57.75 152.50 6 Kodiak 

39 57.95 152.78 6 Whale Island 

42 58.01 152.76 5 Afognak 

227 57.56 156.03 5 Kanatak 

310 60.11 149.41 5 Seward 

213 59.63 151.55 3 Horner 

408 61.21 149.89 3 Anchorage 

433 61.54 150.51 3 Susitna 

500 1934 05 15 13 57 58.01 152.76 3 Afognak 

57.95 152.78 3 Whale Island 

501 1934 05 15 17 05 57.75 152.50 4 Kodiak 

58.01 152.76 3 Afognak 

Table 1-Earthquakes and Intensity Data 29 
EARTHQUAKE PARAMETf1~RS INTENSITY INFORMATION 

I~· Da.te Time Epicenter Mag Oep tl Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W krn km Lat 0 N Lon °W ~M 

502 1934 05 15 22 00 57.75 152.50 5 Kodiak 

60.11 149.41 5 Seward 

503 1934 05 15 23 40 58.01 152.76 4 Afognak 

57.75 152.50 4 Kodiak 

504 1934 05 26 22 32 57.75 152.50 3 Kodiak 

57.06 135.50 3 Sitka 

505 1934 05 29 11 19 61.21 149.89 3 Anchorage 

61.54 150.51 3 Susitna 

506 1934 05 30 22 49 61.21 149.89 3 Anchorage 

61.54 150.51 3 Susitna 

507 1934 06 02 16 45 29 61.25 147.00 6.3 25 155 61.21 149.89 3 Anchorage 

183 60.11 149.41 3 Seward 

190 61.54 150.51 3 Susitna 

508 1934 06 04 06 10 61.21 149.89 3 Anchorage 

509 1934 06 12 00 35 60.11 149.41 3 Seward 

510 1934 06 15 19 30 60.11 149.41 3 Seward 

511 1934 06 17 23 15 61.21 149.89 3 Anchorage 

512 1934 06 18 08 40 57.75 152.50 3 Kodiak 

513 1934 06 18 09 13 50 60.50 151.00 6.8 80 98 60.11 149.41 5 Seward 

99 61.21 149.89 5 Anchorage 

77 60.40 149.62 4 Kenai Lake 

102 59.63 151.55 3 Homer 

266 61.11 146.28 3 Valdez 

295 58.01 152.76 3 Afognak 

514 1934 06 18 15 00 61.11 146.28 3 Valdez 

515 1934 06 19 05 55 57.75 152.50 4 Kodiak 

58.01 152.76 3 Afognak 

57.95 152.78 3 Whale Island 

516 1934 06 19 09 00 60.38 151.35 4 Kasilof 

517 1934 06 19 15 45 57.75 152.50 4 Kodiak 

518 1934 07 14 23 12 61.21 149.89 3 Anchorage 

519 1934 07 16 05 25 61.21 149.89 3 Anchorage 

520 1934 07 20 01 57 58.30 134.41 4 Juneau 

58.20 134.10 3 Taku Inlet 

521 1934 08 02 07 13 08 61.50 147.50 6.0 25 132 61.21 149.89 5 Anchorage 

160 61.54 150.51 4 Susitna 

187 60.11 149.41 4 Seward 

522 1934 08 02 07 37 61.54 149.23 3 Matanuska 

523 1934 08 02 08 00 61.48 142.88 3 Kennicott 

524 1934 08 18 08 00 60.11 149.41 3 Seward 

525 1934 08 24 22 45 61.21 149.89 4 Anchorage 

61.54 149.23 3 Matanuska 

526 1934 09 15 12 00 61.54 149.23 3 Matanuska 

527 1934 09 22 12 05 61.54 149.23 3 Matanuska 

60.11 149.41 3 Seward 

528 1934 10 04 02 05 61.54 150.51 3 Susitna 

529 1934 10 06 18 07 61.54 150.51 3 Susitna 

530 1934 10 11 02 23 64.85 147.71 4 Fairbanks 

531 1934 10 15 01 55 60.11 149.41 3 Seward 

30 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~~- Date Time Epicenter Mag tDep ll Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

532 1934 10 18 02 20 64.86 147.80 3 College 

533 1934 10 28 0119 61.21 149.89 3 Anchorage 

534 1934 10 28 22 04 60.11 149.41 3 Seward 

535 1934 10 29 00 05 61.21 149.89 3 Anchorage 

536 1934 11 01 23 35 60.11 149.41 4 Seward 

61.21 149.89 3 Anchorage 

59.63 151.55 3 Homer 

537 1934 11 03 16 00 66.91 156.87 4 Kobuk 

538 1934 11 07 00 14 61.21 149.89 3 Anchorage 

539 1934 11 09 16 40 60.11 149.41 4 Seward 

61.21 149.89 3 Anchorage 

5~.63 151.55 3 Homer 

540 1934 11 09 18 40 60.11 149.41 3 Seward 

541 1934 11 09 19 41 60.11 149.41 3 Seward 

542 1934 11 10 20 10 61.21 149.89 3 Anchorage 

543 1934 11 12 23 45 61.54 150.51 3 Susitna 

544 1934 11 20 10 30 60.11 149.41 3 Seward 

545 1934 11 22 18 30 61.21 149.89 3 Anchorage 

546 1934 11 22 18 50 61.54 150.51 3 Susitna 

547 1934 11 28 17 13 58.30 134.41 4 Juneau 

548 1934 11 29 05 13 58.00 136.00 47 58.41 135.83 5 Gustavus 

549 1934 11 30 01 35 58.41 135.83 3 Gustavus 

58.30 134.41 3 Juneau 

550 1934 11 30 03 00 58.30 134.41 3 Juneau 

551 1934 12 19 03 00 59.18 135.38 3 Haines 

552 1934 12 20 10 00 61.54 149.23 3 Matanuska 

553 1934 12 22 00 10 61.21 149.89 3 Anchorage 

59.63 151.55 3 Homer 

554 1934 12 22 10 00 61.54 149.23 3 Matanuska 

555 1934 12 28 10 00 61.54 150.51 3 Susitna 

556 1934 12 29 11 00 59.63 151.55 3 Homer 

557 1934 12 29 12 20 61.21 149.89 3 Anchorage 

59.63 151.55 3 Homer 

558 1934 12 29 18 50 59.63 151.55 3 Homer 

559 1935 01 02 05 43 61.54 150.51 3 Susitna 

560 1935 01 05 00 00 59.18 135.38 3 Haines 

561 1935 01 05 06 00 59.18 135.38 3 Haines 

562 1935 01 07 12 00 60.11 149.41 3 Seward 

563 1935 01 13 06 25 59.18 135.38 3 Haines 

564 1935 01 23 07 24 52.25 169.50 6.8 25 269 53.88 166.53 3 Dutch Harbor 

565 1935 01 24 18 32 61.21 149.89 3 Anchorage 

566 1935 01 29 04 38 61.21 149.89 3 Anchorage 

567 1935 02 24 09 35 53.88 166.53 3 Dutch Harbor 

568 1935 03 31 00 40 59.63 151.55 3 Homer 

569 1935 03 31 09 45 59.63 151.55 4 Homer 

570 1935 04 09 07 16 61.54 150.51 3 Susitna 

571 1935 04 10 07 25 61.21 149.89 3 Anchorage 

Table 1-Earthquakes and Intensity Data 31 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

!Eq. Date Time Epicent.er Mag Dep D. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km krn Lat 0 N Lon °W MM 

572 1935 04 10 12 30 60.11 149.41 3 Seward 

573 1935 04 11 00 24 60.11 149.41 3 Seward 

574 1935 04 19 08 12 58.01 152.76 3 Afognak 

575 1935 04 21 15 30 60.11 149.41 3 Seward 

576 1935 04 21 15 45 60.11 149.41 3 Seward 

577 1935 05 19 07 30 58.31 134.10 3 Annex Creek 

578 1935 05 29 08 35 61.54 150.51 3 Susitna 

579 1935 06 12 07 27 58.01 152.76 3 Afognak 

580 1935 06 20 07 30 61.48 142.88 3 Kennicott 

581 1935 07 06 03 31 42 59.00 139.00 208 59.18 135.38 3 Haines 

253 58.16 134.96 3 Lynn Canal 

582 1935 07 06 04 20 59.18 135.38 3 Haines 

583 1935 07 14 10 00 61.21 149.89 3 Anchorage 

584 1935 08 04 09 32 61.21 149.89 3 Anchorage 

585 1935 08 04 09 42 57.75 152.50 3 Kodiak 

586 1935 08 05 10 00 61.54 149.23 3 Matanuska 

587 1935 08 15 04 43 58.01 152.76 3 Afognak 

588 1935 08 15 04 52 57.75 152.50 3 Kodiak 

589 1935 08 18 01 01 50 61.21 149.89 4 Anchorage 

590 1935 08 23 22 05 61.54 150.51 3 Susitna 

591 1935 08 23 22 08 60.11 149.41 3 Seward 

592 1935 08 23 22 09 30 61.00 150.00 24 61.21 149.89 5 Anchorage 

593 1935 08 23 22 11 61.11 146.28 5 Valdez 

594 1935 08 28 10 00 61.21 149.89 3 Anchorage 

60.11 149.41 3 Seward 

595 1935 09 04 01 25 62.46 158.01 3 Flat 

64.58 149.33 3 Nenana 

596 1935 09 22 17 30 64.68 155.58 3 Ruby 

597 1935 09 24 07 09 61.54 150.51 3 Susitna 

598 1935 10 13 12 13 57.75 152.50 3 Kodiak 

599 1935 10 26 19 15 61.11 146.28 3 Valdez 

600 1935 11 06 10 00 61.11 146.28 3 Valdez 

601 1935 11 07 00 35 60.55 145.75 3 Cordova 

602 1935 11 17 10 00 61.54 149.23 3 Matanuska 

603 1935 12 19 02 15 61.54 150.51 3 Susitna 

604 1935 12 25 06 34 60.11 149.41 3 Seward 

605 1935 12 25 09 30 62.33 150.11 3 Talkeetna 

606 1935 12 26 10 00 60.11 149.41 4 Seward 

607 1936 01 22 10 45 61.41 150.59 3 Alexander 

608 1936 01 31 14 44 60.55 145.75 3 Cordova 

609 1936 02 04 13 25 60.11 149.41 3 Seward 

610 1936 03 03 20 35 61.41 150.59 3 Alexander 

611 1936 03 04 13 25 60.11 149.41 3 Seward 

612 1936 03 10 61.54 149.23 3 Matanuska 

613 1936 03 11 09 30 62.16 159.88 3 Holy Cross 

614 1936 03 12 13 45 62.16 159.88 3 Holy Cross 

615 1936 04 10 02 01 60.11 149.41 3 Seward 

32 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

!;~· Date Time Epicent.er !Mag Dep A Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

616 1936 04 16 04 23 57.95 152.78 3 Whale Island 

617 1936 05 08 17 22 18 61.00 153.00 5.8 170 220 60.11 149.41 3 Seward 

618 1936 05 29 14 42 50 56.80 132.70 173 57.06 135.50 4 Sitka 

619 1936 05 30 15 45 55.93 131.57 s Bell Island 

620 1936 05 30 15 48 55.93 131.57 s Bell Island 

621 1936 06 02 02 31 60.11 149.41 s Seward 

622 1936 06 22 04 10 61.54 149.23 s Matanuska 

623 1936 06 22 05 33 60.83 148.98 3 Portage 

60.11 149.41 s Seward 

624 1936 06 22 05 50 61.54 150.51 s Susitna 

625 1936 06 23 10 57.40 135.62 s Rapids 

626 1936 06 29 16 00 60.83 148.98 3 Portage 

627 1936 07 03 03 58 64.86 147.80 s College 

64.58 149.33 3 Nenana 

64.28 146.33 s Richardson 

628 1936 07 03 04 30 57.40 135.62 s Rapids 

629 1936 07 04 06 05 60.83 148.98 s Portage 

630 1936 08 27 00 45 61.54 149.23 3 Matanuska 

631 1936 09 09 23 02 60.11 149.41 3 Seward 

632 1936 09 19 03 45 61.54 150.51 s Susitna 

633 1936 09 19 03 58 61.21 149.89 s Anchorage 

60.11 149.41 s Seward 

634 1936 09 29 18 32 61.21 149.89 4 Anchorage 

60.11 149.41 s Seward 

635 1936 10 23 06 24 24 61.40 149.70 23 61.21 149.89 6 Anchorage 

46 61.54 150.51 5 Susitna 

145 60.11 149.41 5 Seward 

186 61.11 146.28 s Valdez 

234 60.55 145.75 s Cordova 

636 1936 10 23 06 32 61.21 149.89 3 Anchorage 

637 1936 10 23 06 46 60.11 149.41 3 Seward 

638 1936 10 23 06 49 61.21 149.89 3 Anchorage 

60.11 149.41 3 Seward 

61.54 150.51 3 Susitna 

639 1936 10 23 06 58 61.54 150.51 3 Susitna 

640 1936 10 23 06 59 61.54 150.51 s Susitna 

641 1936 10 23 07 25 61.54 150.51 s Susitna 

642 1936 10 23 07 45 61.54 150.51 s Susitna 

643 1936 10 23 08 15 61.54 150.51 s Susitna 

644 1936 10 23 08 22 61.21 149.89 s Anchorage 

60.11 149.41 s Seward 

645 1936 10 23 08 43 61.21 149.89 s Anchorage 

646 1936 10 23 13 00 61.21 149.89 s Anchorage 

647 1936 10 23 15 34 61.21 149.89 s Anchorage 

60.11 149.41 s Seward 

61.54 150.51 s Susitna 

648 1936 10 23 16 15 61.21 149.89 3 Anchorage 

649 1936 10 23 16 24 61.21 149.89 s Anchorage 

60.11 149.41 s Seward 

Table 1-Earthquakes and Intensity Data 33 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I]Eq. Date Time Epicent.er !Mag ~)ep .6 Obs. Location INT Localit.y 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon ow ~M 

650 1936 10 23 16 38 61.21 149.89 3 Anchorage 

61.54 150.51 3 Susitna 

651 1936 10 23 20 25 61.21 149.89 3 Anchorage 

652 1936 10 23 23 07 61.21 149.89 3 Anchorage 

60.11 149.41 3 Seward 

653 1936 10 24 03 30 61.54 150.51 3 Susitna 

654 1936 10 24 10 59.63 151.55 3 Homer 

655 1936 10 25 06 25 59.85 152.90 3 Chinitna Bay 

656 1936 10 25 08 30 59.85 152.90 3 Chinitna Bay 

657 1936 10 25 21 05 60.11 149.41 6 Seward 

61.21 149.89 3 Anchorage 

658 1936 10 25 21 20 61.54 150.51 3 Susitna 

659 1936 10 26 19 31 61.21 149.89 3 Anchorage 

660 1936 10 26 20 02 60.11 149.41 3 Seward 

661 1936 10 26 22 56 61.21 149.89 3 Anchorage 

662 1936 10 27 20 16 61.21 149.89 3 Anchorage 

663 1936 10 28 01 01 61.21 149.89 3 Anchorage 

664 1936 10 29 02 40 60.11 149.41 3 Seward 

61.54 150.51 3 Susitna 

665 1936 10 29 07 02 60.11 149.41 3 Seward 

666 1936 10 29 21 04 61.21 149.89 3 Anchorage 

667 1936 10 30 21 23 60.11 149.41 5 Seward 

668 1936 10 30 21 35 61.54 150.51 3 Susitna 

669 1936 11 02 18 16 61.21 149.89 3 Anchorage 

670 1936 11 03 09 00 61.54 150.51 3 Susitna 

671 1936 11 05 23 00 61.54 150.51 3 Susitna 

672 1936 11 05 23 03 61.21 149.89 3 Anchorage 

673 1936 11 11 17 29 61.21 149.89 3 Anchorage 

674 1936 11 11 17 40 61.54 150.51 3 Susitna 

675 1936 11 14 06 30 57.40 135.62 3 Rapids 

676 1936 11 16 09 16 62.33 150.11 3 Talkeetna 

677 1936 11 16 09 30 61.54 150.51 3 Susitna 

678 1936 11 17 05 15 57.40 135.62 3 Rapids 

679 1936 11 24 21 08 61.21 149.89 4 Anchorage 

680 1936 11 25 21 07 60.11 149.41 3 Seward 

681 1936 11 29 23 00 61.21 149.89 3 Anchorage 

682 1936 11 29 23 15 61.54 150.51 3 Susitna 

683 1936 12 13 01 10 64.67 163.45 3 White Mountain 

684 1936 12 15 09 20 61.21 149.89 3 Anchorage 

685 1936 12 16 13 43 61.21 149.89 3 Anchorage 

686 1936 12 20 02 55 61.54 150.51 3 Susitna 

687 1936 12 22 08 30 57.40 135.62 3 Rapids 

688 1936 12 22 09 45 57.40 135.62 3 Rapids 

689 1936 12 23 09 43 64.16 145.85 5 Big Delta 

690 1937 07 22 17 09 29 64.75 146.75 7.3 25 30 64.48 146.85 8 Sa1cha Bluff 

47 64.85 147.71 6 Fairbanks 

425 61.21 149.89 5 Anchorage 

34 U.S. Geological Survey Bulletin 1840 
EARTHQlTAKE PARAMETERS INTENSITY INFORMATION 

~Eq. Dat.e Time Epicenter Ma.g Dep 6. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

690 1937 07 22 17 09 29 64.75 146.75 7.3 25 117 65.28 148.90 3 Hot Springs 

120 65.52 148.54 3 Livengood 

124 64.58 149.33 3 Nenana 

170 65.83 144.18 3 Circle 

179 66.26 148.05 3 Purgatory 

180 65.:H 143.15 3 Coal Creek 

214 66.57 145.30 3 Fort Yukon 

259 65.18 152.16 3 Tanana 

263 64.15 141.45 3 Jack Wade 

333 67.41 150.10 3 Wiseman 

406 61.11 146.28 3 Valdez 

420 64.68 155.58 3 Ruby 

471 60.55 145.75 3 Cordova 

481 62.97 155.67 3 McGrath 

691 1937 09 03 18 48 12.0 52.50 177.50 7.3 80 3 Ships S. of Aleutians 

692 1937 09 28 02 29 24 58.60 137.70 145 58.10 135.41 3 Hoonah 

195 58.30 134.41 3 Juneau 

693 1937 10 01 10 15 00 58.30 134.41 3 Juneau 

694 1937 10 24 11 36 12 61.00 147.00 165 60.11 149.41 5 Seward 

695 1937 11 24 10 22 00 61.21 149.89 3 Anchorage 

696 1937 11 30 22 10 00 61.21 149.89 3 Anchorage 

697 1937 12 07 14 35 00 61.21 149.89 3 Anchorage 

698 1937 12 11 19 50 00 58.30 134.41 3 Juneau 

699 1938 02 25 08 50 00 61.21 149.89 3 Anchorage 

700 1938 02 25 09 26 00 61.21 149.89 3 Anchorage 

701 1938 02 26 10 50 00 61.21 149.89 3 Anchorage 

702 1938 02 26 15 22 00 61.21 149.89 3 Anchorage 

703 1938 03 17 18 01 00 61.21 149.89 3 Anchorage 

704 1938 03 17 20 29 00 61.21 149.89 3 Anchorage 

705 1938 03 23 14 23 00 58.30 134.41 3 Juneau 

706 1938 04 16 04 47 00 58.30 134.41 3 Juneau 

707 1938 04 18 23 24 00 58.30 134.41 3 Juneau 

708 1938 06 11 19 18 00 58.30 134.41 3 Juneau 

709 1938 11 10 20 18 43 55.50 158.00 8.7 25 351 54.86 163.40 6 False Pass 

170 55.99 160.57 3 Port Moller 

794 61.21 149.89 3 Anchorage 

710 1938 11 15 09 40 00 55.99 160.57 3 Port Moller 

711 1938 12 30 12 15 00 61.21 149.89 3 Anchorage 

712 1939 01 09 12 10 64.85 147.71 3 Fairbanks 

713 1939 01 12 08 05 64.85 147.71 3 Fairbanks 

714 1939 01 25 03 25 64.85 147.71 3 Fairbanks 

715 1939 02 14 07 52 65.00 148.00 22 64.85 147.71 5 Fairbanks 

716 1939 02 21 21 40 64.85 147.71 4 Fairbanks 

717 1939 02 22 09 01 64.85 147.71 3 Fairbanks 

718 1939 02 23 14 20 54.86 163.40 6 False Pass 

719 1939 03 05 10 41 64.85 147.71 3 Fairbanks 

720 1939 03 07 23 55 64.85 147.71 4 Fairbanks 

721 1939 03 27 03 11 64.85 147.71 3 Fairbanks 

722 1939 03 27 19 12 64.85 147.71 3 Fairbanks 

Table 1-Earthquakes and Intensity Data 35 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

IEq. Date Time Epicenter Mag Dep ~ Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

723 1939 03 28 03 34 00 65.20 148.00 41 64.85 147.71 3 Fairbanks 

724 1939 03 31 15 30 00 61.00 147.00 20 60.89 146.70 4 Ellamar 

725 1939 03 31 21 30 64.85 147.71 3 Fairbanks 

726 1939 04 01 04 24 64.85 147.71 3 Fairbanks 

727 1939 04 01 04 35 64.85 147.71 3 Fairbanks 

728 1939 04 27 18 15 64.85 147.71 3 Fairbanks 

729 1939 04 28 09 32 61.21 149.89 3 Anchorage 

730 1939 07 10 02 17 42 62.50 148.00 175 61.21 149.89 3 Anchorage 

73_1 1939 08 07 05 30 61.21 149.89 3 Anchorage 

732 1939 08 17 06 17 53.88 166.53 5 Dutch Harbor 

733 1939 08 20 06 17 53.88 166.53 5 Dutch Harbor 

734 1939 09 02 03 08 64.85 147.71 3 Fairbanks 

735 1939 09 11 04 10 64.85 147.71 3 Fairbanks 

736 1939 09 24 20 16 64.85 147.71 4 Fairbanks 

737 1939 10 05 16 08 64.85 147.71 3 Fairbanks 

738 1939 10 16 21 47 64.85 147.71 6 Fairbanks 

739 1939 11 04 02 34 64.85 147.71 3 Fairbanks 

740 1939 12 17 06 20 64.85 147.71 3 Fairbanks 

741 1939 12 19 06 54 64.85 147.71 3 Fairbanks 

742 1940 01 03 09 57 00 64.85 147.71 3 Fairbanks 

743 1940 01 06 09 30 00 64.85 147.71 3 Fairbanks 

744 1940 01 06 12 56 00 64.16 145.85 5 Big Delta 

64.85 147.71 4 Fairbanks 

745 1940 01 07 07 25 00 64.85 147.71 3 Fairbanks 

746 1940 01 27 02 27 00 64.85 147.71 3 Fairbanks 

747 1940 01 27 03 05 00 64.85 147.71 3 Fairbanks 

748 1940 02 12 09 17 46 55.00 161.50 6.8 25 123 54.86 163.40 5 False Pass 

125 55.99 160.57 5 Port Moller 

749 1940 02 12 10 22 00 54.86 163.40 5 False Pass 

55.99 160.57 5 Port Moller 

750 1940 03 05 22 37 00 64.50 145.50 187 63.83 149.02 4 Healy 

187 63.73 148.91 4 McKinley Park 

233 63.23 149.27 4 Broad Pass 

751 1940 03 05 23 00 30 64.50 145.50 187 63.83 149.02 4 Healy 

187 63.73 148.91 4 McKinley Park 

112 64.85 147.71 3 Fairbanks 

233 63.23 149.27 3 Broad Pass 

752 1940 03 05 23 54 42 64.00 147.50 75 63.73 148.91 5 McKinley Park 

77 63.83 149.02 5 Healy 

95 64.85 147.71 3 Fairbanks 

123 63.23 149.27 3 Broad Pass 

753 1940 03 06 01 15 00 63.73 148.91 3 McKinley Park 

754 1940 03 06 01 32 00 63.73 148.91 3 McKinley Park 

755 1940 03 06 02 35 00 63.73 148.91 3 McKinley Park 

756 1940 03 06 05 51 30 63.90 150.50 80 63.73 148.91 5 McKinley Park 

757 1940 03 06 05 53 00 63.23 149.27 3 Broad Pass 

64.85 147.71 3 Fairbanks 

64.58 149.33 3 Nenana 

36 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~· Date Time Epicenter !Mag ~ep ~ Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

758 1940 03 06 06 28 00 64.85 147.71 4 Fairbanks 

63.23 149.27 3 Broad Pass 

64.58 149.33 3 Nenana 

759 1940 03 06 06 33 00 63.73 148.91 3 McKinley Park 

760 1940 03 06 07 43 00 63.73 148.91 3 McKinley Park 

761 1940 03 07 08 19 00 64.85 147.71 3 Fairbanks 

762 1940 03 09 05 05 00 64.85 147.71 3 Fairbanks 

763 1940 03 23 03 59 00 64.85 147.71 3 Fairbanks 

764 1940 04 12 20 22 00 64.85 147.71 3 Fairbanks 

765 1940 05 04 20 14 00 61.21 149.89 3 Anchorage 

766 1940 05 24 04 17 00 64.85 147.71 5 Fairbanks 

767 1940 06 12 23 05 00 64.16 145.85 3 Big Delta 

768 1940 06 13 19 19 00 64.85 147.71 4 Fairbanks 

769 1940 07 19 16 30 00 61.00 150.00 24 61.21 149.89 6 Anchorage 

770 1940 08 22 02 27 00 51.90 164.90 244 53.86 166.53 4 Unalaska 

246 53.88 166.53 3 Dutch Harbor 

771 1940 08 30 07 32 00 65.00 148.00 22 64.85 147.71 5 Fairbanks 

772 1940 09 13 07 51 00 64.85 147.71 4 Fairbanks 

773 1940 09 22 21 40 00 64.85 147.71 3 Fairbanks 

774 1940 10 11 07 56 00 60.00 150.00 6.0 135 61.21 149.89 4 Anchorage 

775 1940 11 02 21 08 00 58.30 134.41 2 Juneau 

776 1941 01 12 10 07 00 64.85 147.71 3 Fairbanks 

777 1941 01 22 06 37 00 64.85 147.71 3 Fairbanks 

778 1941 02 02 11 58 00 61.21 149.89 3 Anchorage 

779 1941 02 07 18 14 00 64.85 147.71 3 Fairbanks 

780 1941 03 02 03 56 00 64.85 147.71 3 Fairbanks 

781 1941 03 05 03 56 00 64.85 147.71 3 Fairbanks 

782 1941 03 05 07 35 00 64.85 147.71 3 Fairbanks 

783 1941 03 05 08 50 00 64.85 147.71 3 Fairbanks 

784 1941 03 28 14 29 00 64.85 147.71 4 Fairbanks 

785 1941 03 31 16 56 00 64.85 147.71 3 Fairbanks 

786 1941 04 21 19 34 00 53.00 166.00 102 53.86 166.53 3 Unalaska 

787 1941 04 30 22 55 00 64.85 147.71 3 Fairbanks 

788 1941 05 01 07 15 00 53.86 166.53 3 Unalaska 

789 1941 05 17 05 35 00 64.85 147.71 3 Fairbanks 

790 1941 05 18 13 05 00 64.85 147.71 3 Fairbanks 

791 1941 06 11 21 46 00 61.21 149.89 3 Anchorage 

792 1941 06 13 01 15 00 64.85 147.71 3 Fairbanks 

793 1941 07 01 15 59 00 64.85 147.71 3 Fairbanks 

794 1941 07 21 08 43 00 64.85 147.71 3 Fairbanks 

795 1941 07 25 10 01 00 64.85 147.71 3 Fairbanks 

796 1941 07 26 10 46 00 64.85 147.71 3 Fairbanks 

797 1941 07 30 01 51 21 61.00 151.00 6.3 64 61.21 149.89 6 Anchorage 

798 1941 07 30 02 03 00 61.21 149.89 3 Anchorage 

799 1941 07 30 02 35 00 61.21 149.89 3 Anchorage 

800 1941 07 30 09 11 00 61.21 149.89 3 Anchorage 

801 1941 08 10 07 06 00 58.30 134.41 3 Juneau 

Table 1-Earthquakes and Intensity Data 37 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

l~q. Dat.e Time Epicent.er Mag Dep ll Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

802 1941 08 10 07 34 00 58.30 134.41 3 Juneau 

803 1941 08 12 14 05 00 64.50 165.41 3 Nome 

804 1941 08 31 20 55 00 64.85 147.71 3 Fairbanks 

805 1941 09 15 19 22 00 64.50 165.41 3 Nome 

806 1941 09 19 14 03 00 61.21 149.89 3 Anchorage 

807 1941 09 21 20 56 00 61.21 149.89 3 Anchorage 

808 1941 09 23 04 16 00 61.21 149.89 3 Anchorage 

809 1941 10 05 20 30 00 52.94 173.25E 4 Attu 

810 1941 10 15 03 20 00 64.85 147.71 3 Fairbanks 

811 1941 10 27 07 14 12 61.00 161.00 599 61.21 149.89 4 Anchorage 

812 1941 10 28 10 14 00 64.85 147.71 3 Fairbanks 

813 1941 11 01 04 39 00 64.85 147.71 3 Fairbanks 

814 1941 11 15 13 15 00 64.85 147.71 3 Fairbanks 

815 1941 12 06 09 00 00 64.85 147.71 3 Fairbanks 

816 1941 12 08 01 35 00 64.85 147.71 3 Fairbanks 

817 1941 12 08 01 50 00 58.30 134.41 3 Juneau 

818 1941 12 14 11 21 00 61.21 149.89 3 Anchorage 

819 1941 12 20 12 47 00 64.85 147.71 3 Fairbanks 

820 1941 12 29 01 40 00 61.21 149.89 3 Anchorage 

821 1941 12 29 05 58 00 61.21 149.89 3 Anchorage 

822 1941 12 29 06 52 00 61.21 149.89 3 Anchorage 

823 1942 01 01 08 01 64.85 147.71 3 Fairbanks 

824 1942 01 01 08 01 00.0 64.85 147.71 3 Fairbanks 

825 1942 01 30 12 58 64.85 147.71 3 Fairbanks 

826 1942 04 13 21 05 64.50 165.41 3 Nome 

827 1942 05 19 10 35 61.21 149.89 3 Anchorage 

828 1942 05 19 13 05 61.21 149.89 3 Anchorage 

829 1942 05 19 13 15 61.21 149.89 3 Anchorage 

830 1942 05 30 02 15 64.50 165.41 4 Nome 

831 1942 06 05 00 55 61.21 149.89 3 Anchorage 

832 1942 07 21 10 55 64.85 147.71 3 Fairbanks 

833 1942 09 10 01 29 64.85 147.71 3 Fairbanks 

834 1942 09 14 07 30 64.85 147.71 3 Fairbanks 

835 1942 09 18 08 50 64.85 147.71 3 Fairbanks 

836 1942 11 19 13 20 64.85 147.71 3 Fairbanks 

837 1942 12 05 12 45 61.21 149.89 4 Anchorage 

838 1942 12 14 16 37 64.85 147.71 3 Fairbanks 

839 1943 02 15 02 22 64.85 147.71 3 Fairbanks 

840 1943 02 17 10 50 64.85 147.71 3 Fairbanks 

841 1943 04 03 03 19 64.85 147.71 3 Fairbanks 

842 1943 04 09 13 00 61.21 149.89 3 Anchorage 

843 1943 05 02 04 50 64.85 147.71 3 Fairbanks 

844 1943 05 19 09 27 66.82 162.60 3 Kotzebue 

845 1943 07 06 22 04 61.21 149.89 3 Anchorage 

846 1943 07 28 04 04 48 59.80 149.00 165 61.21 149.89 4 Anchorage 

847 1943 08 25 19 56 61.21 149.89 4 Anchorage 

38 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~Eq. Date Time Epicenter Mag Dep 6. 0 bs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon ow MM 

848 1943 09 27 09 45 61.21 149.89 a Anchorage 

849 1943 11 02 14 30 64.85 147.71 3 Fairbanks 

850 1943 11 03 14 32 17 61.75 151.00 7.3 25 84 61.21 149.89 5 Anchorage 

277 62.97 155.67 4 McGrath 

591 60.78 161.83 4 Bethel 

851 1943 11 12 00 36 64.85 147.71 3 Fairbanks (Garden Island) 

852 1943 11 14 01 25 64.85 147.71 3 Fairbanks (Garden Island) 

853 194S 12 30 03 55 64.85 147.71 3 Fairbanks 

854 1944 01 26 2S 55 61.21 149.89 3 Anchorage 

855 1944 01 29 02 48 62.97 155.67 a McGrath 

856 1944 02 26 06 so 66.82 162.60 3 Kotzebue 

857 1944 02 26 2S 22 61.21 149.89 3 Anchorage 

858 1944 02 28 18 46 64.85 147.71 3 Slaterville 

859 1944 07 18 23 29 61.21 149.89 3 Anchorage 

860 1944 07 30 21 48 61.21 149.89 3 Anchorage 

861 1944 10 20 20 S4 61.21 149.89 3 Anchorage 

862 1945 01 18 03 54 61.21 149.89 s Anchorage 

863 1945 01 22 00 04 4 Slaters Camp 

864 1945 02 09 03 47 61.21 149.89 3 Anchorage 

865 1945 02 11 08 40 61.21 149.89 s Anchorage 

866 1945 OS 06 02 19 64.50 165.41 s Nome 

867 1945 04 12 17 40 61.21 149.89 3 Anchorage 

868 1945 06 OS 23 07 3 Slaters Camp 

869 1945 09 18 lS 55 51.86 176.66 s Adak 

870 1945 10 10 22 00 61.21 149.89 s Anchorage 

871 1945 10 15 18 03 58.30 134.41 s Juneau 

872 1945 10 15 21 06 58.30 134.41 3 Juneau 

873 1945 11 15 18 01 23 59.00 1S8.00 262 57.06 135.50 3 Sitka 

874 1945 11 17 04 05 58.30 134.41 3 Juneau 

59.38 135.33 3 Skagway 

875 1945 11 18 00 20 58.30 134.41 s Juneau 

876 1945 12 02 10 S7 61.21 149.89 3 Anchorage 

877 1946 01 12 20 25 S7 59.25 147.25 7.2 50 263 61.21 149.89 4 Anchorage 

167 60.55 145.75 3 Cordova 

878 1946 OS 02 07 51 62.97 155.67 4 McGrath 

879 1946 OS 11 11 20 61.21 149.89 4 Anchorage 

880 1946 04 01 11 57 55.36 131.58 4 Ketchikan 

881 1946 04 01 12 28 54 52.75 163.50 7.4 50 203 54.40 164.79 6 Scotch Cap 

244 54.75 165.00 6 Unimak Island 

193 54.41 162.66 3 Sanak Island 

223 54.75 163.31 s Ikatan 

278 55.18 162.50 a Cold Bay 

228 54.16 166.00 a Akutan Island 

238 53.88 166.53 a Dutch Harbor 

353 55.16 160.00 3 Shumagin Islands 

513 56.30 158.45 3 Chignik 

882 1946 04 19 02 ao 61.21 149.89 a Anchorage 

883 1946 06 26 06 43 64.85 147.71 a Fairbanks 

Table 1-Earthquakes and Intensity Data 39 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~· Date Time Epicenter Mag Dep A Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon ow km km Lat 0 N Lon °W MM 

884 1946 07 01 03 54 64.85 147.71 4 Fairbanks 

885 1946 08 29 04 01 61.21 149.89 3 Anchorage 

886 1946 10 19 14 25 61.21 149.89 3 Anchorage 

60.55 145.75 3 Cordova 

887 1946 10 30 07 13 61.00 149.00 122 60.05 147.90 3 Latouche 

888 1947 01 02 19 13 62.97 155.67 3 McGrath 

889 1947 02 03 19 30 55.36 131.58 3 Ketchikan 

890 1947 02 03 21 00 55.36 131.58 3 Ketchikan 

891 1947 02 03 23 30 55.36 131.58 3 Ketchikan 

892 1947 04 30 04 52 3 58.30 134.41 3 Juneau 

893 1947 06 06 00 04 61.21 149.89 4 Anchorage 

894 1947 06 29 07 59 58.30 134.41 4 Juneau 

895 1947 07 28 03 50 64.85 147.71 4 Fairbanks 

896 1947 08 05 07 30 61.21 149.89 4 Anchorage 

897 1947 08 28 01 54 64.85 147.71 3 Fairbanks 

898 1947 10 16 02 09 47 64.50 148.80 7.0 50 27 64.58 149.33 8 Nenana 

65 64.85 147.71 8 Fairbanks 

23 64.70 148.90 '1 Berg 

26 64.33 149.16 7 Clear 

86 63.73 148.91 '1 McKinley Park 

55 64.83 147.95 6 Ester Creek 

57 64.01 149.11 6 Ferry 

75 63.83 149.01 6 Healy Fork 

219 65.57 144.90 6 Central 

130 65.48 150.30 5 Rampart 

228 62.55 150.16 5 Blair Lake 

347 63.08 142.53 5 Tetlin 

379 62.97 155.67 5 McGrath 

66 64.81 147.63 4 Ladd Air Force Base 

147 64.16 145.85 4 Big Delta 

290 63.35 143.50 4 Tanacross 

362 66.07 142.00 4 Chicken 

371 61.21 149.89 4 Anchorage 

95 64.41 146.83 3 Harding Lake 

217 66.37 147.50 3 Beaver 

303 62.26 145.38 3 Gulkana 

330 67.41 150.10 3 Wiseman 

380 62.97 141.92 3 Northway 

432 64.88 157.83 3 Koyukuk 

467 60.55 145.75 3 Cordova 

899 1948 01 29 19 10 62.97 155.67 4 McGrath 

900 1948 02 11 15 43 64.85 147.71 4 Fairbanks 

62.97 141.92 4 Northway 

901 1948 02 11 17 00 64.85 147.71 4 Fairbanks 

902 1948 02 14 22 10 64.85 147.71 3 Fairbanks 

903 1948 02 14 22 15 64.85 147.71 3 Fairbanks 

904 1948 02 28 03 59 55.05 131.56 4 Annette 

905 1948 05 03 03 55 64.85 147.71 3 Fairbanks 

906 1948 05 29 18 58 61.21 149.89 4 Anchorage 

907 1948 06 21 07 47 64.86 147.80 3 College Observatory 

908 1948 06 21 07 55 64.86 147.80 3 College Observatory 

40 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~· Dat.e Time Epicen t.er Mag Dep 1::. Obs. Location INT Locality 

0. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

909 1948 06 26 03 00 65.63 168.15 3 Wales (.5 mi SE. of) 

910 1948 07 15 23 11 61.21 149.89 3 Anchorage 

911 1948 07 28 08 05 64.85 147.71 4 Fairbanks 

912 1948 07 28 08 18 64.85 147.71 3 Fairbanks 

913 1948 08 01 20 22 64.85 147.71 3 Fairbanks 

914 1948 08 17 05 26 60.78 161.83 4 Bethel 

62.97 155.67 4 McGrath 

915 1948 08 19 13 53 61.21 149.89 4 Anchorage 

60.55 145.75 4 Cordova 

916 1948 08 30 02 07 61.21 149.89 3 Anchorage 

917 1948 09 03 21 25 61.21 149.89 4 Anchorage 

918 1948 10 09 07 38 61.21 149.89 3 Anchorage 

919 1948 11 20 15 16 61.21 149.89 4 Anchorage 

920 1948 12 05 22 41 61.21 149.89 4 Anchorage 

921 1949 02 23 20 05 22 62.00 154.00 100 235 61.21 149.89 4 Anchorage 

922 1949 02 26 23 19 61.21 149.89 3 Anchorage 

923 1949 03 07 11 42 62.97 141.92 4 Northway 

924 1949 03 12 19 27 57 61.00 147.00 157 61.21 149.89 4 Anchorage 

925 1949 04 03 13 05 61.21 149.89 3 Anchorage 

926 1949 04 07 19 20 61.21 149.89 4 Anchorage 

927 1949 04 08 06 52 61.21 149.89 4 Anchorage 

928 1949 04 11 06 14 64.85 147.71 3 Fairbanks 

929 1949 04 12 05 05 08 66.50 153.00 304 64.85 147.71 3 Fairbanks 

930 1949 04 12 07 28 64.85 147.71 3 Fairbanks 

931 1949 05 12 07 31 64.85 147.71 3 Fairbanks 

932 1949 06 07 04 37 61.21 149.89 2 Anchorage 

933 1949 06 19 10 00 61.79 148.46 5 Chickaloon 

934 1949 06 19 22 04 28.0 61.00 150.00 100 24 61.21 149.89 4 Anchorage 

935 1949 06 20 08 30 64.85 147.71 3 Fairbanks 

936 1949 07 09 05 10 61.21 149.89 4 Anchorage 

937 1949 08 27 09 45 61.21 149.89 3 Anchorage 

938 1949 08 31 13 47 11 62.00 153.00 187 61.21 149.89 3 Anchorage 

939 1949 09 02 07 35 55.05 131.56 4 Annette 

940 1949 09 03 03 06 47 62.00 148.00 100 133 61.21 149.89 4 Anchorage 

941 1949 09 15 19 40 61.21 149.89 3 Anchorage 

942 1949 09 27 15 30 45 59.75 149.00 7.0 50 170 61.21 149.89 5 Anchorage 

201 60.55 145.75 4 Cordova 

943 1950 01 02 11 35 00 64.85 147.71 4 Fairbanks 

944 1950 01 03 17 15 00 58.30 134.41 4 Juneau 

945 1950 01 30 02 49 49 61.50 150.00 33 61.21 149.89 3 Anchorage 

946 1950 02 24 21 27 00 60.55 145.75 3 Cordova 

947 1950 03 09 17 38 02 61.00 151.00 150 64 61.21 149.89 4 Anchorage 

62 61.18 149.91 3 Spenard 

948 1950 04 05 01 17 13 52.00 177.00 28 51.86 176.66 3 Adak 

949 1950 04 22 18 50 00 64.85 147.71 4 Fairbanks 

950 1950 04 22 20 05 00 64.85 147.71 4 Fairbanks 

951 1950 05 23 20 58 00 61.21 149.89 4 Anchorage 

Table 1-Earthquakes and Intensity Data 41 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~~- Date Time Epicenter Mag Dep ~ Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

952 1950 05 25 00 48 49 61.21 149.89 4 Anchorage 

953 1950 05 25 08 34 37 65.50 151.50 6.0 187 64.86 147.80 3 College 

954 1950 05 25 08 37 00 62.97 155.67 4 McGrath 

955 1950 08 08 09 25 00 61.21 149.89 4 Anchorage 

956 1950 08 13 18 39 16 51.50 177.00 46 51.86 176.66 3 Adak 

957 1950 08 26 04 39 27 65.00 162.00 6.5 205 66.82 162.60 5 Kotzebue 

295 65.63 168.15 4 Wales 

237 66.25 166.18 3 Shishmaref 

958 1950 08 27 00 34 12 65.00 162.00 171 64.50 165.41 3 Nome 

959 1950 08 27 00 37 31 65.00 162.00 171 64.50 165.41 3 Nome 

960 1950 08 27 15 33 32 64.50 165.41 3 Nome 

961 1950 09 24 20 13 28 64.00 156.00 406 64.86 147.80 s College 

962 1950 09 28 21 47 01 54.50 134.50 199 55.05 131.56 3 Annette 

963 1950 10 11 08 35 19 63.00 160.00 150 564 61.21 149.89 4 Anchorage 

964 1950 10 1S 21 S1 00 61.21 149.89 4 Anchorage 

965 1950 11 22 10 16 28 51.50 176.50 6.8 42 51.86 176.66 3 Adak 

966 1950 12 26 00 53 00 61.77 156.58 3 Stony River 

967 1951 01 17 08 ss 61.21 149.89 s Anchorage 

968 1951 01 2S 07 00 61.21 149.89 3 Anchorage 

969 1951 02 08 10 40 61.21 149.89 3 Anchorage 

970 1951 02 13 OS 02 60.55 145.75 4 Cordova 

971 1951 02 25 16 20 59.63 151.55 s Homer 

972 1951 03 07 06 so 62.00 153.00 3 Punt ilia 

973 1951 03 15 18 25 61.98 150.05 s Caswell 

974 1951 03 15 18 30 61.60 149.08 s Palmer 

975 1951 03 28 12 50 65.20 166.38 s Teller 

976 1951 03 30 2S 2S 61.60 149.08 3 Palmer 

977 1951 03 S1 02 45 65.20 166.38 s Teller 

978 1951 03 31 09 18 61.11 146.28 s Valdez 

979 1951 04 03 13 20 61.60 149.08 s Palmer 

980 1951 04 09 15 26 61.46 149.36 s Eklutna 

981 1951 05 08 01 55 61.98 150.05 s Caswell 

982 1951 05 14 02 43 61.98 150.05 s Caswell 

983 1951 06 25 16 12 37 61.00 150.10 6.S 128 23 61.18 149.91 5 Spenard 

26 61.21 149.89 5 Anchorage 

24 61.21 149.89 4 Loussac-Sogn 

237 60.55 145.75 4 Cordova 

83 61.60 149.08 3 Palmer 

984 1951 07 20 04 27 61.46 149.36 3 Eklutna 

985 1951 07 20 04 32 61.98 150.05 s Caswell 

986 1951 08 17 05 38 61.21 149.89 s Anchorage 

987 1951 09 12 02 00 61.11 146.28 s Valdez 

988 1951 09 26 10 OS 19 51.85 176.58 3 Finger Bay 

989 1951 09 27 05 21 51.85 176.58 3 Finger Bay 

990 1951 11 04 15 28 22 64.86 147.80 3 College 

991 1951 11 15 1S 55 61.21 149.89 4 Anchorage 

4 Panoramic View 

61.60 149.08 3 Palmer 

42 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~Eq. Date Time Epicenter Mag Dep 6 Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

992 1951 11 24 05 30 38 51.85 176.58 3 Finger Bay 

993 1951 12 so 17 42 14 62.00 148.80 47 61.60 149.08 3 Palmer 

56 61.54 149.23 3 Matanuska 

994 1951 12 31 22 02 61.54 149.23 3 Matanuska 

61.60 149.08 3 Palmer 

995 1952 01 01 08 02 00 61.60 149.08 3 Palmer 

996 1952 01 26 04 50 52 52.20 178.50 132 51.86 176.66 4 Adak 

131 51.88 176.66 3 Adak (Mitchell Field) 

997 1952 02 02 10 20 07 51.40 179.20 96 183 51.86 176.66 3 Adak 

998 1952 02 22 11 39 18 61.80 150.90 85 61.21 149.89 4 Anchorage 

999 1952 03 09 20 00 17 59.50 136.00 6.0 162 58.30 134.41 5 Juneau 

238 57.50 134.58 4 Angoon 

273 57.06 135.50 4 Sitka 

1000 1952 05 09 06 20 00 61.60 149.08 3 Palmer 

1001 1952 05 18 15 45 00 65.00 150.63 3 Manley Hot Springs 

1002 1952 05 22 09 06 00 61.98 150.05 3 Caswell 

1003 1952 05 23 16 30 00 61.98 150.05 3 Caswell 

1004 1952 06 14 02 10 00 57.33 152.96 3 Shearwater 

1005 1952 06 16 07 15 00 67.41 150.10 3 Wiseman 

1006 1952 06 28 02 35 00 61.11 146.28 3 Valdez 

1007 1952 06 28 06 49 06 51.86 176.66 3 Adak 

1008 1952 06 29 03 25 00 61.98 150.05 3 Caswell 

1009 1952 07 18 00 18 00 61.21 149.89 3 Anchorage 

1010 1952 07 25 08 45 00 61.60 149.08 3 Palmer 

1011 1952 07 28 07 20 00 63.18 147.46 3 McKinley 

1012 1952 07 29 19 54 27 53.50 175.00 212 51.88 176.66 3 Adak (Mitchell Field) 

1013 1952 08 07 06 58 22 64.86 147.80 3 College 

1014 1952 08 10 00 21 50 52.80 173.20 96 214 52.05 176.10 3 Great Sitkin I. 

258 51.86 176.66 3 Adak 

1015 1952 08 13 22 30 00 64.50 154.25 3 Lost River 

1016 1952 08 14 07 30 00 64.50 154.25 3 Lost River 

1017 1952 08 14 16 00 00 64.50 154.25 3 Lost River 

1018 1952 08 15 04 17 00 64.50 154.25 3 Lost River 

1019 1952 08 16 20 35 00 64.50 154.25 3 Lost River 

1020 1952 08 17 05 44 00 64.50 154.25 3 Lost River 

1021 1952 08 17 21 36 00 64.50 154.25 3 Lost River 

1022 1952 08 18 01 22 00 64.50 154.25 3 Lost River 

1023 1952 08 18 01 24 00 64.50 154.25 3 Lost River 

1024 1952 08 28 00 22 39 51.88 176.66 3 Adak (Mitchell Field) 

1025 1952 09 27 06 33 33 52.30 177.30 96 64 51.88 176.66 4 Adak (Mitchell Field) 

1026 1952 09 28 02 21 48 58.50 137.00 184 57.06 135.50 3 Sitka 

1027 1952 10 06 01 35 53 61.21 149.89 4 Anchorage 

61.18 149.91 4 Spenard 

1028 1952 10 06 05 15 00 61.21 149.89 4 Anchorage 

1029 1952 10 09 20 31 00 61.21 149.89 3 Anchorage 

1030 1952 10 10 21 53 46 61.21 149.89 3 Anchorage 

1031 1952 10 23 17 51 20 64.86 147.80 3 CoiJege 

Table 1-Earthquakes and Intensity Data 43 
~Eq. No. 

1032 

1033 

1034 

1035 

1036 

1037 

1038 

1039 

1040 

1041 

1042 

1043 

1044 

1045 

1046 

1047 

1048 

1049 

1050 

1051 

1052 

1053 

1 

1 

1 

1 

1 

054 

055 

056 

057 

058 

059 

060 

061 

062 

EARTHQUAKE PARAMETERS 

Date Time Epicent.er 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1952 11 05 16 46 20 

1952 11 15 15 50 00 

1952 11 21 17 26 48 66.00 166.00 

1952 11 29 23 45 00 

1952 12 05 02 24 00 

1952 12 05 12 30 00 

1952 12 06 02 54 00 

1952 12 07 00 50 17 52.50 17 4.20E 

1952 12 07 05 05 00 

1952 12 13 19 56 00 

1952 12 14 07 16 00 

1952 12 15 06 06 00 

1952 12 26 19 20 00 

1952 12 28 02 55 00 

1952 12 28 04 57 07 

1952 12 28 05 28 09 

1952 12 29 01 25 00 

1952 12 29 06 00 00 

1952 12 29 15 31 00 

1952 12 30 06 40 00 

1953 01 05 07 48 20 53.00 171.50E 

1953 01 11 10 56 00 

1953 01 16 15 55 00 

1953 01 17 06 45 00 

1953 01 29 01 20 00 

1953 01 30 05 32 00 

1953 02 05 15 05 00 

1953 02 14 03 40 00 

1953 02 19 02 50 00 

1953 02 19 16 25 00 

1953 02 22 06 20 00 

44 U.S. Geological Survey Bulletin 1840 

Mag Dep Ll 

km km 

573 

91 

6.3 25 

7.1 118 

INTENSITY INFORMATION 

Obs. Location INT Locality 

Lat 0 N Lon °W MM 

61.21 149.89 3 Anchorage 

61.38 149.05 3 Eklutna Lake 

60.38 151.35 3 Kasilof 

60.53 150.75 3 Naptown 

60.11 149.41 3 Seward 

61.11 146.28 3 Valdez 

60.75 148.80 3 Whittier 

64.50 154.25 4 Lost River 

64.50 154.25 5 Lost River 

65.20 166.38 3 Tel1er 

57.33 152.96 3 Shearwater 

64.50 154.25 3 Lost River 

65.20 166.38 3 Tel1er 

64.50 154.25 5 Lost River 

52.72 174.11E 6 Shemya 

60.75 148.80 3 Whittier 

64.50 154.25 4 Lost River 

61.98 150.05 3 Caswel1 

64.50 154.25 4 Lost River 

61.98 150.05 3 Caswell 

64.50 154.25 3 Lost River 

64.50 154.25 3 Lost River 

65.20 166.38 3 Teller 

64.50 154.25 4 Lost River 

65.20 166.38 3 TelJer 

65.63 168.15 3 Wales 

64.50 154.25 4 Lost River 

65.20 166.38 4 Teller 

64.50 154.25 4 Lost River 

64.50 154.25 4 Lost River 

65.20 166.38 3 Teller 

65.20 166.38 3 Teller 

60.38 151.35 3 Kasilof 

61.21 149.89 4 Anchorage 

61.98 150.05 3 Caswell 

52.94 173.25E 3 Attu 

62.97 141.92 4 Northway 

64.50 154.25 4 Lost River 

64.50 154.25 3 Lost River 

64.50 154.25 3 Lost River 

64.50 154.25 3 Lost River 

64.50 154.25 3 Lost River 

65.20 166.38 3 Teller 

61.21 149.89 4 Anchorage 

61.21 149.89 3 Anchorage (Merrill Field) 

61.46 149.36 3 Eklutna 

60.75 148.80 3 Whittier 

61.46 149.36 3 Eklutna 

65.20 166.38 3 Teller 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~~- Date Time Epicenter Ma.g Dep ~ Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat. 0 N Lon °W MM 

1063 1953 03 06 06 57 26 58.50 156.50 307 59.68 151.65 3 Homer (5 mi NW. of) 

359 60.38 151.35 3 Kasilof 

1064 1953 03 17 06 00 00 59.63 151.55 3 Homer 

1065 1953 04 10 07 45 00 65.20 166.38 3 Teller 

1066 1953 04 11 00 45 00 65.20 166.38 3 Teller 

1067 1953 04 13 14 15 00 60.11 149.41 3 Seward 

1068 1953 04 19 22 47 39 50.50 179.00 223 51.86 176.66 3 Adak 

1069 1953 04 22 08 05 00 61.11 146.28 3 Valdez 

1070 1953 04 25 16 46 49 51.86 176.66 3 Adak 

1071 1953 05 05 11 30 00 51.80 176.41 3 Kagalaska Strait 

3 Pathfinder (Ship) 

1072 1953 05 08 08 38 00 51.80 176.41 3 Kagalaska Strait 

3 Pathfinder (Ship) 

1073 1953 05 12 12 39 06 52.30 177.30 96 3 Pioneer (Ship) 

66 51.86 176.66 3 Adak 

87 52.05 176.10 3 Great Sitkin I. 

222 52.72 174.11E 3 Shemya 

1074 1953 05 15 09 37 03 52.25 171.75 340 51.86 176.66 3 Adak 

1075 1953 05 20 09 48 12 51.86 176.66 3 Adak 

1076 1953 05 21 02 15 00 60.11 149.41 3 Seward 

1077 1953 05 23 15 00 00 65.20 166.38 3 Teller 

1078 1953 05 28 05 00 00 59.63 151.55 3 Homer 

1079 1953 05 28 06 35 00 59.63 151.55 3 Homer 

1080 1953 06 09 22 25 00 61.11 146.28 3 Valdez 

1081 1953 06 10 00 37 00 64.85 147.71 4 Fairbanks 

1082 1953 06 20 08 30 00 60.75 148.80 3 Whittier 

1083 1953 06 20 13 30 00 59.68 151.65 3 Homer (5 mi NW. of) 

1084 1953 06 27 23 30 00 60.11 149.41 3 Seward 

1085 1953 07 05 02 18 44 51.00 178.50 100 160 51.86 176.66 3 Adak 

1086 1953 07 18 22 10 00 5 Wonder Lake (Near) 

1087 1953 07 20 09 47 19 51.86 176.66 3 Adak 

1088 1953 07 23 10 54 55 51.86 176.66 4 Adak 

1089 1953 07 26 22 04 00 61.11 146.28 3 Valdez 

1090 1953 07 31 17 45 00 60.11 149.41 3 Seward 

1091 1953 08 28 10 50 05 64.00 142.00 115 62.97 141.92 4 Northway 

1092 1953 09 13 08 35 00 61.98 150.05 3 Caswell 

1093 1953 09 21 07 13 00 59.68 151.65 3 Homer (5 mi NW. of) 

1094 1953 09 22 20 20 00 61.11 146.28 3 Valdez 

1095 1953 09 28 01 55 61.13 145.73 4 Thompson Pass 

1096 1953 09 28 15 55 00 61.13 145.73 4 Thompson Pass 

61.11 146.28 3 Valdez 

1097 1953 10 09 04 14 00 60.38 151.35 3 Kasilof 

60.11 149.41 3 Seward 

1098 1953 10 14 06 30 00 59.68 151.65 3 Homer (5 mi NW. of) 

1099 1953 10 15 21 47 00 59.68 151.65 3 Homer (5 mi NW. of) 

1100 1953 10 23 05 27 00 59.68 151.65 3 Homer (5 mi NW. of) 

1101 1953 12 04 20 00 00 61.11 146.28 3 Valdez 

1102 1953 12 15 23 00 00 61.11 146.28 3 Valdez 

Table 1-Earthquakes and Intensity Data 45 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

IJEq. Date Time Epicent.er Ma.g Dt>p A Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon ° W km km Lat 0 N Lon °W MM 

1103 1953 12 18 06 47 00 64.50 165.41 4 Nome 

1104 1953 12 18 07 47 00 65.20 166.38 3 Teller 

1105 1953 12 18 08 05 00 65.20 166.38 3 Teller 

1106 1953 12 18 14 07 00 64.50 165.41 4 Nome 

1107 1954 01 07 05 30 00 61.11 146.28 3 Valdez 

1108 1954 01 14 04 04 07 61.11 146.28 3 Valdez 

1109 1954 01 20 04 43 41 60.38 151.35 3 Kasilof 

1110 1954 01 20 22 19 46 60.38 151.35 3 Kasilof 

1111 1954 01 21 18 56 47 65.48 144.63 3 Circle Hot Springs 

1112 1954 01 21 18 58 43 65.48 144.63 3 Circle Hot Springs 

1113 1954 02 19 10 00 00 59.63 151.55 3 Homer 

1114 1954 03 03 10 00 00 60.48 149.40 3 Moose Pass 

1115 1954 03 03 19 50 00 60.55 145.75 3 Cordova 

1116 1954 03 03 20 46 07 61.50 146.50 60 45 61.11 146.28 5 Valdez 

184 61.21 149.89 3 Anchorage 

1117 1954 03 03 21 05 00 60.11 149.41 3 Seward 

1118 1954 03 04 08 57 00 61.11 146.28 3 Valdez 

1119 1954 03 28 18 30 00 52.72 174.11E 4 Shemya 

1120 1954 03 31 12 13 56 63.73 148.91 3 McKinley Park 

1121 1954 04 06 04 56 45 61.21 149.89 4 Anchorage 

1122 1954 04 06 06 32 48 61.21 149.89 4 Anchorage 

1123 1954 04 06 06 38 52 61.21 149.89 4 Anchorage 

1124 1954 04 17 20 10 37 51.50 179.00 6.8 167 51.86 176.66 3 Adak 

1125 1954 04 24 02 40 36 64.85 147.71 4 Fairbanks 

64.86 147.80 3 College 

1126 1954 04 24 08 33 04 63.00 148.00 100 208 64.86 147.80 3 College 

1127 1954 04 24 08 45 00 61.11 146.28 3 Valdez 

1128 1954 04 29 05 15 00 65.20 166.38 3 Teller 

1129 1954 04 29 05 45 00 65.20 166.38 3 Teller 

1130 1954 05 11 00 25 11 61.98 150.05 3 Caswell 

1131 1954 05 12 17 46 45 59.63 151.55 3 Homer 

1132 1954 05 16 13 00 00 56.50 170.00 27 56.58 169.58 5 Saint George Island 

1133 1954 06 24 14 19 00 65.00 150.63 3 Manley Hot Springs 

1134 1954 06 27 19 00 00 65.20 166.38 3 Teller 

1135 1954 07 03 13 24 03 61.21 149.89 4 Anchorage 

1136 1954 07 30 22 05 00 61.11 146.28 3 Valdez 

1137 1954 08 17 17 28 51 59.63 151.55 3 Homer 

1138 1954 08 23 14 57 34 61.00 148.50 78 61.21 149.89 5 Anchorage 

32 60.75 148.80 3 Whittier 

111 60.11 149.41 3 Seward 

120 61.11 146.28 3 Valdez 

133 60.53 150.75 3 Naptown 

170 60.38 151.35 3 Kasilof 

227 59.63 151.55 3 Homer 

1 139 1954 10 03 11 18 46 60.50 151.00 6.8 100 14 60.54 150.76 8 Sterling 

19 60.58 151.31 8 Kenai 

98 60.11 149.41 8 Seward 

99 61.21 149.89 8 Anchorage 

46 U.S. Geological Survey Bulletin 1840 
I~· No. 

1139 

1140 

1141 

1142 

1143 

1144 

1145 

1146 

1147 

1148 

1149 

1150 

1151 

1152 

1153 

1154 

1155 

1156 

1157 

1158 

1159 

1160 

1 161 

1162 

1163 

1164 

1165 

1 

1 

1 

1 

1 

1 

166 

167 

168 

169 

170 

171 

EARTHQUAKE PARAMETERS 

Da.t.e Time ~~picent.er 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1954 10 03 11 18 46 60.50 151.00 

1954 10 04 20 12 36 

1954 10 10 11 59 59 

1954 10 10 19 55 00 

1954 10 10 20 31 00 

1954 10 22 12 54 22 

1954 11 03 12 30 00 

1954 11 15 10 00 00 

1954 11 16 10 00 00 

1954 11 21 03 37 15 

1954 11 27 00 04 14 

1954 11 28 14 52 00 

1954 12 02 19 02 00 

1954 12 10 16 31 46 

1954 12 13 17 13 00 

1954 12 13 2S 09 42 

1954 12 so 11 32 28 5S.OO 168.00 

1955 01 1S 02 OS 43 5S.OO 167.50 

1955 01 13 02 S5 45 53.00 167.50 

1955 01 21 14 18 S3 53.00 168.00 

1955 02 13 02 37 

1955 02 27 20 50 

1955 02 28 01 16 

1955 03 01 04 42 58 65.30 132.90 

1955 03 30 12 15 

1955 04 11 11 26 

1955 04 18 16 34 

1955 04 28 19 04 59 51.00 178.50 

1955 05 14 12 38 08 59.50 151.50 

1955 05 14 21 29 01 61.00 148.00 

1955 05 15 01 52 

1955 05 21 03 06 

1955 05 25 03 58 36 54.00 165.50 

Mag Dcp ~ 

km km 

6.8 100 102 

88 

90 

23 

139 

150 

161 

179 

199 

288 

318 

513 

632 

266 

6.6 60 137 

6.9 115 

6.5 115 

137 

603 

6.8 510 

6.5 160 

100 22 

52 

94 

69 

INTENSITY INFORMATION 

Ohs. Location INT Locality 

La.t 0 N Lon °W MM 

59.63 151.55 8 Homer 

60.48 149.40 6 Moose Pass 

61.05 149.79 6 Potter 

60.38 151.35 3 Kasilof 

61.46 149.36 3 Eklutna 

61.54 149.23 3 Matanuska 

61.60 149.08 3 Palmer 

60.05 147.90 3 Latouche 

62.00 153.00 3 Puntilla 

60.55 145.75 3 Cordova 

57.75 152.50 3 Kodiak 

64.85 147.71 3 Fairbanks 

59.55 139.81 3 Yakutat 

61.11 146.28 8 Valdez 

60.58 151.31 3 Kenai 

60.58 151.31 3 Kenai 

60.58 151.31 3 Kenai 

60.58 151.31 3 Kenai 

60.58 151.31 3 Kenai 

61.60 149.08 5 Palmer 

53.86 166.53 4 Unalaska 

53.86 166.53 3 Unalaska 

65.48 144.63 3 Circle Hot Springs 

61.11 146.28 3 Valdez 

61.11 146.28 3 Valdez 

61.11 146.28 3 Valdez 

61.38 149.05 3 EkJutna Lake 

60.75 148.80 3 Whittier 

65.20 166.38 s Teller 

60.75 148.80 s Whittier 

53.86 166.53 3 Unalaska 

53.86 166.53 s Unalaska 

53.86 166.53 s Unalaska 

53.86 166.53 3 Unalaska 

51.86 176.66 3 Adak 

60.75 148.80 3 Whittier 

61.98 150.05 3 Caswell 

65.63 168.15 3 Wales 

62.97 141.92 4 Northway 

59.44 136.02 3 Moose Valley 

65.00 150.63 3 Manley Hot Springs 

60.75 148.80 3 Whittier 

51.86 176.66 3 Adak 

59.68 151.65 3 Homer (5 mi NW. of) 

60.75 148.80 3 Whittier 

61.11 146.28 3 Valdez 

60.75 148.80 3 Whittier 

61.21 149.89 3 Anchorage 

53.86 166.53 4 Unalaska 

Table !-Earthquakes and Intensity Data 47 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

lEq. Dat.e Time Epicent.er Mag Dep 6 Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

1172 1955 05 25 04 03 18 54.00 165.50 69 53.86 166.53 4 Unalaska 

1173 1955 05 29 18 43 60.75 148.80 3 Whittier 

1174 1955 07 08 10 00 55.18 162.50 3 Cold Bay 

1175 1955 07 11 05 15 59.44 136.02 3 Moose Valley 

1176 1955 07 16 18 00 59.44 136.02 3 Moose Valley 

1177 1955 07 17 21 58 25 54.00 168.00 5.9 98 53.86 166.53 3 Unalaska 

1178 1955 07 19 16 21 05 60.50 145.50 15 60.55 145.75 4 Cordova 

80 61.11 146.28 3 Valdez 

1179 1955 07 19 16 44 24 60.50 146.00 15 60.55 145.75 3 Cordova 

70 61.11 146.28 3 Valdez 

1180 1955 07 24 00 13 59.44 136.02 3 Moose Valley 

1181 1955 07 31 13 22 44 60.38 151.35 3 Kasilof 

60.11 149.41 3 Seward 

1182 1955 08 05 20 49 60.58 151.31 3 Kenai 

1183 1955 08 05 20 52 60.58 151.31 3 Kenai 

1184 1955 08 08 21 57 60.75 148.80 3 Whittier 

1185 1955 08 09 13 45 60.38 151.35 3 Kasilof 

1186 1955 08 11 17 30 60.75 148.80 3 Whittier 

1187 1955 08 11 19 43 60.75 148.80 3 Whittier 

1188 1955 08 15 14 55 61.98 150.05 3 Caswell 

1189 1955 08 16 14 54 61.16 149.90 3 Anchorage (5 mi SW. of) 

1190 1955 08 31 12 23 36 63.50 147.00 154 64.85 147.71 4 Fairbanks 

1191 1955 09 16 04 00 57.57 154.46 3 Karluk River 

1192 1955 09 17 16 58 64.85 147.71 4 Fairbanks 

64.86 147.80 3 College 

1193 1955 10 08 06 40 60.54 150.76 3 Sterling 

1194 1955 10 08 06 50 60.38 151.35 3 Kasilof 

1195 1955 10 28 09 17 12 58.50 138.00 219 57.06 135.50 3 Sitka 

1196 1955 11 14 07 30 61.11 146.28 3 Valdez 

1197 1955 12 10 02 50 61.98 150.05 3 Caswell 

1198 1955 12 18 22 58 61.11 146.28 3 Valdez 

1199 1955 12 21 12 56 61.54 149.23 3 Matanuska 

1200 1955 12 29 16 04 45 59.50 154.00 100 296 61.21 149.89 4 Anchorage 

134 59.68 151.65 3 Homer (5 mi NW. of) 

178 60.38 151.35 3 Kasilof 

266 60.11 149.41 3 Seward 

306 60.95 149.30 3 Girdwood 

350 61.98 150.05 3 Caswell 

1201 1956 01 07 10 00 00 60.54 150.76 3 Sterling 

1202 1956 01 07 10 43 20 61.21 149.89 4 Anchorage 

1203 1956 01 20 15 23 28 61.98 150.05 3 Caswell 

1204 1956 02 24 09 15 00 60.38 151.35 3 Kasilof 

1205 1956 03 02 11 56 20 63.50 149.50 174 64.85 147.71 4 Fairbanks 

26 63.33 149.13 3 Summit 

39 63.73 148.91 3 McKinley Park 

134 62.33 150.11 3 Talkeetna 

173 64.86 147.80 3 College 

1206 1~56 03 26 08 17 24 61.50 151.00 68 61.21 149.89 4 Anchorage 

48 U.S. Geological Survey Bulletin 1840 
,~. No. 

1207 

1208 

1209 

1210 

1211 

1212 

1213 

1214 

1215 

1216 

1217 

1218 

1219 

1220 

1221 

1222 

1223 

1224 

1225 

1226 

1227 

1228 

1229 

1230 

1231 

1232 

1233 

1234 

1235 

1236 

1237 

1238 

1239 

1240 

1241 

1242 

1 243 

1244 

1 

1 

1 

245 

246 

247 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lou 0 W 

1956 03 29 05 53 42 

1956 03 29 06 00 00 

1956 03 30 17 50 45 

1956 03 31 11 54 00 63.00 155.50 

1956 04 27 05 20 00 

1956 04 28 05 55 00 

1956 04 29 00 08 28 

1956 05 07 20 58 02 

1956 05 18 04 19 16 65.00 148.00 

1956 05 19 08 19 01 

1956 05 19 08 35 00 

1956 05 19 21 55 00 

1956 06 09 02 24 53 

1956 06 09 02 26 57 64.00 148.00 

1956 08 18 23 36 45 

1956 09 01 15 30 00 

1956 09 01 15 32 00 

1956 09 28 04 55 50 

1956 09 29 21 49 

1956 10 26 07 26 00 

1956 11 17 17 23 05 

1956 11 17 20 27 15 54.50 134.00 

1956 12 07 07 24 00 

1956 12 25 05 26 00 

1956 12 25 05 30 00 

1956 12 25 05 50 00 

1956 12 25 05 52 00 

1957 03 09 14 06 52 65.00 149.00 

1957 03 09 14 22 27.5 51.30 175.80 

1957 03 09 14 45 65.00 149.00 

1957 03 09 15 41 50 50.50 177.00 

1957 03 09 16 32 30 51.00 176.00 

1957 03 09 16 45 26 51.50 174.00 

1957 03 09 17 10 13 51.50 172.50 

1957 03 09 19 37 31 51.00 173.00 

1957 03 10 03 06 10.5 51.60 17 4.40 

1957 03 10 03 08 55 51.50 17 4.00 

1957 03 10 05 33 27 52.00 17 4.00 

1957 03 10 07 23 18 52.00 176.00 

1957 03 10 12 45 31 51.00 177.00 

1957 03 10 15 26 23.5 51.50 173.60 

Mag Dep ~ 

km km 

9 

22 

18 

96 

6.5 182 

266 

63 

59 

68 

8.3 86 

562 

63 

153 

106 

188 

291 

272 

6.6 159 

188 

184 

48 

99 

6.8 215 

INTENSITY INFORMATION 

Obs. Location INT Locality 

Lat 0 N Lon °W MM 

60.11 149.41 3 Seward 

64.85 147.71 4 Fairbanks 

64.86 147.80 3 College 

62.97 155.67 5 McGrath 

57.66 136.10 4 Chichagof 

61.11 146.28 3 Valdez 

53.86 166.53 3 Unalaska 

53.86 166.53 3 Unalaska 

64.85 147.71 5 Fairbanks 

64.86 147.80 3 College 

61.11 146.28 3 Valdez 

59.68 151.65 3 Homer (5 mi NW. of) 

61.11 146.28 3 Valdez 

65.28 148.90 4 Hot Springs 

64.86 147.80 5 College 

61.11 146.28 3 Valdez 

61.01 159.95 3 Nyac 

61.01 159.95 3 Nyac 

61.98 150.05 3 Caswell 

61.98 150.05 3 Caswell 

61.54 149.23 4 Matanuska 

61.98 150.05 3 Caswell 

55.36 131.58 4 Ketchikan 

56.81 132.95 4 Petersburg 

60.95 149.30 3 Girdwood 

60.95 149.30 3 Girdwood 

61.21 149.89 3 Anchorage 

60.38 151.35 3 Kasilof 

60.95 149.30 3 Girdwood 

61.21 149.89 3 Anchorage 

64.85 147.71 5 Fairbanks 

64.86 147.80 3 College 

64.81 147.63 3 Ladd Air Force Base 

51.86 176.66 8 Adak 

53.26 168.21 8 Umnak 

64.85 147.71 3 Fairbanks 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

Table 1-Earthquakes and Intensity Data 49 
~~~· No. 

1248 

1249 

1250 

1251 

1252 

1253 

1254 

1255 

1256 

1257 

1258 

1259 

1260 

1261 

1262 

1263 

1264 

1265 

1266 

1267 

1268 

1269 

1270 

1271 

1272 

1273 

1274 

1275 

1276 

1277 

1278 

1279 

1280 

1281 

1 

1 

1 

1 

1 

282 

283 

284 

285 

286 

287 

288 

289 

290 

EARTHQUAKE PARAMETERS 

Dat.e Time Epkent.er 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1957 03 10 16 37 45 51.50 173.50 

1957 03 10 19 18 30 51.00 177.00 

1957 03 10 19 40 55 52.00 173.00 

1957 03 11 03 12 41.5 51.20 176.70 

1957 03 11 03 35 51.50 177.00 

1957 03 11 03 55 27 50.50 177.00 

1957 03 11 04 05 09 51.00 177.00 

1957 03 11 07 08 51.00 177.00 

1957 03 11 07 39 05 51.50 178.50 

1957 03 11 08 42 48 50.50 178.00 

1957 03 11 14 55 19.0 51.51178.75 

1957 03 11 15 S5 53 51.10 179.00 

1957 03 11 23 32 03 52.00 173.00 

1957 03 12 01 02 33 52.00 174.50 

1957 03 12 01 46 35 52.00 173.00 

1957 03 12 07 28 48 51.70 174.10 

1957 03 12 07 39 17.5 51.00 178.20 

1957 03 12 08 03 14 51.20 177.20 

1957 03 12 10 38 30 51.50 174.50 

1957 03 12 11 44 54.0 51.39 176.90 

1957 03 12 17 00 21 51.50 175.00 

1957 03 12 18 25 18 51.00 178.00 

1957 03 12 23 45 25 52.00 174.00 

1957 03 13 02 48 21.0 51.85 171.07 

1957 03 13 03 S2 58 51.40 175.30 

1957 03 13 07 21 53 51.40 178.40 

1957 03 1S 11 37 49 51.00 177.00 

1957 03 13 11 57 58 52.00 173.00 

1957 03 13 12 42 35 51.50 177.00 

1957 03 13 15 42 04 51.30 178.50 

1957 03 13 17 43 40 51.00 175.00 

1957 03 14 00 35 38 51.00 178.00 

1957 03 14 14 47 45.0 51.32 176.44 

1957 03 14 15 51 51.50 177.50 

1957 03 14 17 06 21 51.00 178.00 

1957 03 14 22 18 2S 51.50 176.00 

1957 03 15 04 12 56 51.00 176.00 

1957 03 15 11 57 28 51.00 173.00 

1957 OS 15 22 13 25 51.50 177.00 

1957 03 16 02 13 2S 51.50 175.00 

1957 03 16 02 34 15.0 51.57 178.86 

1957 03 16 03 33 57 52.00 174.00 

1957 OS 16 09 so 36 51.00 177.00 

50 U.S. Geological Survey Bulletin 1840 

INTENSITY INFORMATION 

Mag Dep ~ Obs. Location INT Localit.y 

km km Lat 0 N Lon °W MM 

222 51.86 176.66 3 Adak 

99 51.86 176.66 3 Adak 

252 51.86 176.66 3 Adak 

6.9 73 51.86 176.66 3 Adak 

46 51.86 176.66 3 Adak 

153 51.86 176.66 3 Adak 

99 51.86 176.66 3 Adak 

99 51.86 176.66 s Adak 

133 51.86 176.66 3 Adak 

178 51.86 176.66 3 Adak 

6.8 150 51.86 176.66 s Adak 

744 53.26 168.21 s Umnak 

6.5 183 51.86 176.66 3 Adak 

776 53.26 168.21 s Umnak 

252 51.86 176.66 s Adak 

149 51.86 176.66 s Adak 

252 51.86 176.66 3 Adak 

6.4 178 51.86 176.66 3 Adak 

6.4 144 51.86 176.66 s Adak 

82 51.86 176.66 3 Adak 

656 53.26 168.21 3 Umnak 

155 51.86 176.66 s Adak 

7.3 55 51.86 176.66 3 Adak 

628 53.26 168.21 s Umnak 

122 51.86 176.66 3 Adak 

134 51.86 176.66 3 Adak 

184 51.86 176.66 s Adak 

385 51.86 176.66 s Adak 

107 51.86 176.66 s Adak 

131 51.86 176.66 3 Adak 

99 51.86 176.66 s Adak 

252 51.86 176.66 s Adak 

46 51.86 176.66 3 Adak 

6.8 142 51.86 176.66 s Adak 

150 51.86 176.66 3 Adak 

134 51.86 176.66 3 Adak 

7.2 62 51.86 176.66 3 Adak 

71 51.86 176.66 3 Adak 

134 51.86 176.66 s Adak 

61 51.86 176.66 3 Adak 

106 51.86 176.66 s Adak 

272 51.86 176.66 s Adak 

46 51.86 176.66 s Adak 

122 51.86 176.66 s Adak 

6.8 155 51.86 176.66 3 Adak 

184 51.86 176.66 s Adak 

99 51.86 176.66 s Adak 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~~- Dat.e Time Epicent.er Mag Dep .1. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec La.t 0 N Lon ow km km Lat. 0 N Lon ow MM 

1291 1957 03 17 01 46 56 51.00 180.00 251 51.86 176.66 3 Adak 

1292 1957 03 17 02 48 36 51.00 178.50 160 51.86 176.66 3 Adak 

1293 1957 03 17 07 53 51 51.00 179.00 189 51.86 176.66 3 Adak 

1294 1957 03 18 00 12 10 51.00 179.50 219 51.86 176.66 3 Adak 

1295 1957 03 18 05 08 34 51.50 179.00 167 51.86 176.66 3 Adak 

1296 1957 03 18 20 03 47 52.00 180.00 230 51.86 176.66 3 Adak 

1297 1957 03 19 00 40 61.11 146.28 3 Valdez 

1298 1957 03 19 03 39 35 52.00 175.50 81 51.86 176.66 3 Adak 

1299 1957 03 19 11 28 51.0 51.60 176.67 29 51.86 176.66 3 Adak 

1300 1957 03 19 12 50 51 51.50 175.00 6.8 122 51.86 176.66 3 Adak 

1301 1957 03 20 00 00 51 52.00 173.00 252. 51.86 176.66 3 Adak 

1302 1957 03 20 03 25 51.50 175.50 90 51.86 176.66 3 Adak 

1303 1957 03 20 11 01 42 52.00 172.00 321 51.86 176.66 3 Adak 

1304 1957 03 20 20 28 03 51.50 17 4.50 155 51.86 176.66 3 Adak 

1305 1957 03 21 04 29 02 52.00 173.00 252 51.86 176.66 3 Adak 

1306 1957 03 21 15 46 16 51.00 175.00 150 51.86 176.66 3 Adak 

1307 1957 03 21 17 39 12 51.50 177.00 46 51.86 176.66 3 Adak 

1308 1957 03 23 13 24.33 51.50 179.00 167 51.86 176.66 3 Adak 

1309 1957 03 23 13 39 53 51.00 179.50 219 51.86 176.66 3 Adak 

1310 1957 03 24 07 29 15 51.00 179.50 219 51.86 176.66 3 Adak 

1311 1957 03 24 13 53 53 51.00 179.50 219 51.86 176.66 3 Adak 

1312 1957 03 25 01 03 59 52.00 176.00 48 51.86 176.66 3 Adak 

1313 1957 03 26 02 47 50 51.00 177.50 112 51.86 176.66 3 Adak 

1314 1957 03 26 18 16 47 51.00 179.50 219 51.86 176.66 3 Adak 

1315 1957 03 28 01 15 20 51.50 174.50 155 51.86 176.66 3 Adak 

1316 1957 03 30 00 42 40 51.50 179.50 200 51.86 176.66 3 Adak 

1317 1957 03 30 01 50 39 51.50 178.00 101 51.86 176.66 3 Adak 

1318 1957 03 30 09 17 00.0 51.95 175.16 6.2 104 51.86 176.66 3 Adak 

1319 1957 03 31 10 08 28.0 51.51 178.47 6.1 131 51.86 176.66 3 Adak 

1320 1957 04 03 23 09 15 51.50 177.00 46 51.86 176.66 3 Adak 

1321 1957 04 04 00 13 04 58.17 155.04 6.0 89 158 58.19 152.35 4 Kitoi Bay 

157 57.75 152.50 3 Kodiak 

1322 1957 04 04 14 00 61.11 146.28 3 Valdez 

1323 1957 04 05 16 36 2 5i.5o 178.50 133 51.86 176.66 3 Adak 

1324 1957 04 08 03 30 58.19 152.35 3 Kitoi Bay 

1325 1957 04 22 67.50 151.58 3 Wild Lake 

1326 1957 04 24 14 00 60.55 145.75 3 Cordova 

1327 1957 04 25 10 25 60.55 145.75 3 Cordova 

1328 1957 04 25 13 22 42 60.55 145.75 4 Cordova 

1329 1957 04 25 14 07 58 60.50 145.00 97 61.11 146.28 3 Valdez 

1330 1957 04 26 10 23 17 60.00 14 7.00 92 60.55 145.75 4 Cordova 

130 61.11 146.28 3 Valdez 

1331 1957 06 01 13 39 60.58 151.31 3 Kenai 

1332 1957 06 01 16 03 52 59.50 150.50 68 59.68 151.65 3 Homer (5 mi NW. of) 

129 60.58 151.31 3 Kenai 

1333 1957 06 06 61.11 146.28 3 Valdez 

1334 1957 06 13 04 08 08 64.86 147.80 3 Col1ege 

Table 1-Earthquakes and Intensity Data 51 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~~- Dat.e Time Epicenter Mag Dep !::J. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat. 0 N Lon ow km km Lat. 0 N Lon ow MM 

1334 1957 06 13 04 08 08 64.85 147.71 3 Fairbanks 

1335 1957 06 18 23 30 67.50 149.44 3 Big Lake (Settlement) 

1336 1957 06 23 03 27 03.0 57.92 137.71 5.6 163 57.06 135.50 3 Sitka 

1337 1957 07 16 17 57 61.98 150.05 3 Caswell 

1338 1957 07 25 18 00 61.98 150.05 3 Caswell 

1339 1957 08 13 12 00 03 61.00 148.00 94 61.11 146.28 3 Valdez 

1340 1957 08 18 18 30 59.44 136.02 3 Moose Valley 

1341 1957 08 27 18 15 59.68 151.65 3 Homer (5 mi NW. of) 

1342 1957 10 04 11 19 59.68 151.65 3 Homer (5 mi NW. of) 

1343 1957 10 04 23 03 61.11 146.28 3 Valdez 

1344 1957 10 11 21 20 59.68 151.65 3 Homer (5 mi NW. of) 

1345 1957 11 07 07 39 07 64.86 147.80 4 College 

64.85 147.71 4 Fairbanks 

63.73 148.91 3 McKinley Park 

64.58 149.33 3 Nenana 

1346 1957 11 22 11 09 61.11 146.28 3 Valdez 

1347 1957 12 03 20 40 60.11 149.41 3 Seward 

1348 1957 12 10 01 31 59.44 136.02 3 Moose Valley 

1349 1957 12 20 20 17 61.46 149.36 3 Eklutna 

1350 1958 01 07 23 07 44 61.11 146.28 3 Valdez 

1351 1958 01 10 22 33 37 59.73 151.05 3 Bear Cove 

59.63 151.55 3 Homer 

60.38 151.35 3 Kasilof 

1352 1958 01 13 10 29 65.00 148.00 18 64.86 147.80 5 College 

22 64.85 147.71 4 Fairbanks 

1353 1958 01 20 02 37 14 59.60 151.70 9 59.63 151.55 3 Homer 

1354 1958 01 24 23 17 29 60.00 152.00 6.5 60 56 60.38 151.35 4 Kasilof 

178 61.21 149.89 4 Anchorage 

182 60.95 149.30 4 Girdwood 

217 61.46 149.36 4 Eklutna 

217 61.46 149.36 3 Eklutna 

223 61.38 149.05 3 Eklutna Lake 

239 61.60 149.08 3 Palmer 

351 60.55 145.75 3 Cordova 

1355 1958 02 05 12 05 14 61.11 146.28 3 Valdez 

1356 1958 02 16 22 20 63.00 155.00 34 62.97 155.67 5 McGrath 

1357 1958 03 05 19 26 35 64.86 147.80 3 College 

64.85 147.71 3 Fairbanks 

1358 1958 03 31 15 50 65.50 156.00 29 65.66 156.50 5 Huslia 

1359 1958 04 07 15 30 40.0 66.03 156.59 7.3 41 65.66 156.50 8 Huslia 

102 66.03 154.33 7 Hughes 

99 66.91 156.87 7 Kobuk 

151 64.93 154.70 7 Kokrines 

158 64.68 155.58 7 Ruby 

225 65.18 152.16 7 Tanana 

185 66.56 152.68 6 Allakaket 

432 64.85 147.71 6 Fairbanks 

148 64.71 157.00 6 Galena 

131 65.99 153.70 6 Indian Mountain AFS 

282 66.82 162.60 6 Kotzebue 

52 U.S. Geological Survey Bulletin 1840 
~~- No. 

1359 

1360 

1361 

1362 

1 

1 

1 

363 

364 

365 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1958 04 07 15 30 40.0 66.03 156.59 

1958 04 09 06 15 12 56.50 139.00 

1958 04 11 12 18 66.00 162.50 

1958 04 13 09 07 24 66.00 156.00 

1958 04 18 07 39 07 

1958 04 25 15 39 46 

1958 05 05 23 53 29 57.50 136.50 

Mag Dep D. 

km km 

7.3 98 

338 

315 

238 

238 

242 

427 

418 

47 

140 

310 

298 

344 

293 

374 

165 

171 

519 

314 

460 

324 

517 

414 

564 

308 

509 

433 

225 

588 

294 

466 

459 

340 

416 

343 

223 

92 

270 

6.8 76 

109 

176 

151 

199 

272 

314 

111 

290 

400 

405 

78 

1661 

INTENSITY INFORMATION 

Obs. Location INT Locality 

Lat 0 N Lon ow MM 

66.88 157.16 6 Shungnak 

6 Skivetna 

66.01 149.13 6 Stevens Village 

68.15 151.79 5 Anaktuvuk Pass 

66.90 151.69 5 Bettles 

66.88 151.67 5 Bettles Field 

65.91 161.93 5 Candle 

64.86 147.80 5 College 

62.46 153.96 5 Farewell 

66.22 155.67 5 Hogatza 

64.88 157.83 5 Koyukuk 

63.90 152.36 5 Lake Minchumina 

65.00 150.63 5 Manley Hot Springs 

62.97 155.67 5 McGrath 

64.70 162.04 5 Moses Point 

64.58 149.33 5 Nenana 

64.70 158.16 5 Nulato 

66.58 160.16 5 Selawik 

62.33 150.11 5 Talkeetna 

63.86 160.83 5 Unalakleet 

67.00 146.50 5 Venetie 

67.41 150.10 5 Wiseman 

61.58 159.55 4 Aniak 

62.66 160.20 4 Anvik 

65.83 144.18 4 Circle 

65.18 150.21 4 Eureka 

66.57 145.30 4 Fort Yukon 

63.83 149.02 4 Healy 

66.83 161.23 4 Noorvik 

71.30 156.80 4 Point Barrow 

65.48 150.30 4 Rampart 

63.33 149.13 4 Summit 

65.20 166.38 4 Teller 

64.85 149.82 4 Tolovana 

69.36 152.13 4 Umiat 

59.55 139.81 5 Yakutat 

57.06 135.50 4 Sitka 

66.82 162.60 5 Kotzebue 

66.91 156.87 5 Kobuk 

66.03 154.33 5 Hughes 

66.91 156.87 5 Kobuk 

64.70 158.16 5 Nulato 

64.71 157.00 4 Galena 

65.18 152.16 4 Tanana 

65.00 150.63 4 Manley Hot Springs 

64.85 149.82 4 Tolovana 

66.88 157.16 3 Shungnak 

63.90 152.36 3 Lake Minchumina 

64.86 147.80 3 College 

64.85 147.71 3 Fairbanks 

61.21 149.89 3 Anchorage 

59.63 151.55 3 Homer 

57.06 135.50 5 Sitka 

65.90 162.45 5 Chicago 

Table 1-Earthquakes and Intensity Data 53 
EARTHQUAKE PARAMETERS 1NTENSITY INFORMATION 

,~q. Dat.e Time Epicent.er Mag Dep ~ Ob~. Loca.tion INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

1365 1958 05 05 23 53 29 57.50 136.50 93 58.10 135.41 3 Hoonah 

153 58.30 134.41 3 Juneau 

198 59.18 135.38 3 Haines 

228 56.81 132.95 3 Petersburg 

1366 1958 05 10 22 54 39 65.23 152.01 6.4 9 65.18 152.16 5 Tanana 

70 65.00 150.63 5 Manley Hot Springs 

139 66.03 154.33 3 Hughes 

202 64.86 147.80 3 College 

206 64.85 147.71 3 Fairbanks 

1367 1958 05 10 23 13 19 64.50 152.50 78 65.18 152.16 5 Tanana 

105 65.00 150.63 5 Manley Hot Springs 

191 66.03 154.33 3 Hughes 

227 64.86 147.80 3 College 

232 64.85 147.71 3 Fairbanks 

1368 1958 05 11 05 23 55 65.10 151.94 6.4 63 65.00 150.63 5 Manley Hot Springs 

151 66.03 154.33 3 Hughes 

197 64.86 147.80 3 College 

201 64.85 147.71 3 Fairbanks 

1369 1958 05 11 05 37 01 65.00 151.50 175 64.86 147.80 3· College 

1370 1958 05 11 09 08 43 65.00 152.50 26 65.18 152.16 3 Tanana 

88 65.00 150.63 3 Manley Hot Springs 

143 66.03 154.33 3 Hughes 

222 64.86 147.80 3 College 

227 64.85 147.71 3 Fairbanks 

1371 1958 05 11 12 11 22 65.00 153.50 66 65.18 152.16 4 Tanana 

274 64.85 147.71 4 Fairbanks 

1372 1958 05 13 08 15 11 61.60 149.08 3 Palmer 

1373 1958 05 13 08 22 19 61.60 149.08 3 Palmer 

1374 1958 07 08 05 48 58 59.63 151.55 3 Homer 

1375 1958 07 10 06 15 51 58.60 137.10 7.9 32 58.60 137.65 11 Dohn (Doane) River 

32 58.60 137.65 11 Lituya Bay 

130 59.30 138.90 11 Dry Bay (Akwe River) 

96 59.13 138.41 11 Dry Bay (East River) 

98 59.15 138.43 11 Alsek River 

152 59.35 139.30 11 Dangerous River 

170 59.43 139.59 10 Strawberry Point 

185 59.55 139.75 10 Khantaak I. (Pt. Turner) 

137 58.39 134.78 9 Lena Point 

170 59.45 139.57 8 Situk Trestle 

188 59.55 139.81 8 Yakutat 

209 59.90 139.75 8 Yakutat Bay (Khantaak 1.) 

114 58.10 135.41 7 Hoonah 

134 59.38 135.33 7 Skagway 

206 59.98 139.50 7 Disenchantment Bay 

216 57.08 134.83 7 Baran of 

77 58.41 135.83 6 Gustavus 

161 58.30 134.41 6 Juneau 

196 57.06 135.50 6 Sitka 

222 60.17 134.70 6 Carcross, Y.T. 

263 60.73 135.08 6 Whitehorse, Y.T. 

300 60.30 141.20 6 Mount St. Elias 

318 56.81 132.95 6 Petersburg 

344 60.07 142.41 6 Cape Yakataga 

54 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~~- Date Time Epicenter Mag Dcp 6. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

1375 1958 07 10 06 15 51 58.60 137.10 7.9 564 63.62 135.80 6 Mayo, Y.T. 

162 58.28 134.40 5 Douglas 

193 57.50 134.58 5 Angoon 

216 57.08 134.83 5 Baran of 

216 56.85 135.53 5 Biorka Island 

256 57.00 134.00 5 Kake 

635 54.32 130.30 5 Prince Rupert, B.C. 

182 59.82 134.98 4 Bennett, B.C. 

202 57.05 135.35 4 Mount Edgecombe 

300 56.25 134.65 4 Port Alexander 

335 61.60 137.42 4 Ashihik, Y.T. 

358 57.90 131.15 4 Telegraph Creek, B.C. 

457 60.20 144.52 4 Kat all a 

459 62.40 140.35 4 Snag, Y.T. 

473 62.07 142.05 4 Chisana 

493 55.36 131.58 4 Ketchikan 

524 61.50 144.52 4 Chitina 

535 60.55 145.75 4 Cordova 

701 60.75 148.80 4 Whittier 

772 61.21 149.89 4 Anchorage 

25 58.38 137.07 F Icy Point 

88 57.96 136.22 F Pelican 

98 58.42 135.45 F Excursion Inlet 

118 59.18 135.38 F Haines 

127 58.42 134.95 F Pt Retreat Lighthouse 

178 58.31 134.10 F Annex Creek 

288 56.38 134.64 F Little Port Walter 

339 56.01 134.13 F Cape Decision 

367 56.45 132.46 F Wrangell 

449 59.80 144.60 F Cape Saint Elias 

585 61.11 146.28 F Valdez 

733 60.95 149.30 F Girdwood 

801 60.54 150.76 F Sterling 

1376 1958 07 13 08 10 01.0 58.91 136.99 5.6 224 57.06 135.50 3 Sitka 

1377 1958 07 13 20 10 58.31 134.10 3 Annex Creek 

1378 1958 07 13 20 20 58.31 134.10 3 Annex Creek 

1379 1958 07 16 06 17 18 60.95 149.30 3 Girdwood 

61.60 149.08 3 Palmer 

1380 1958 07 17 13 48 45 57.50 137.00 103 57.06 135.50 3 Sitka 

178 58.30 134.41 3 Juneau 

1381 1958 07 18 17 03 58 58.50 138.50 240 58.30 134.41 3 Juneau 

1382 1958 07 31 15 48 32 61.50 151.00 68 61.21 149.89 3 Anchorage 

87 61.46 149.36 3 Eklutna 

103 61.60 149.08 3 Palmer 

1383 1958 08 17 09 08 35.0 51.38 176.23 61 51.86 176.66 3 Adak 

1384 1958 08 31 23 00 18 63.27 144.23 5.9 26 38 63.35 143.50 5 Tanacross 

1385 1958 09 01 02 30 63.00 144.00 46 63.35 143.50 5 Tanacross 

1386 1958 09 02 10 42 51.86 176.66 3 Adak 

1387 1958 09 07 12 40 61.46 149.36 3 Eklutna 

1388 1958 09 11 04 30 61.11 146.28 3 Valdez 

1389 1958 10 04 12 58 24 61.21 149.89 4 Anchorage 

64.86 147.80 3 College 

Table 1-Earthquakes and Intensity Data 55 
IEq. 

No. 

1390 

1391 

1392 

1393 

1394 

1395 

1396 

1397 

1398 

1399 

1400 

1401 

1402 

1403 

1404 

1405 

1406 

1407 

1408 

1409 

1410 

1411 

1412 

1413 

1414 

1415 

1416 

1417 

1418 

1419 

1420 

1421 

1422 

1423 

1 

1 

1 

1 

424 

425 

426 

427 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1958 10 05 15 32 08 

1958 10 07 08 46 31 

1958 10 08 00 17 

1958 10 20 00 55 32.0 51.90 175.15 

1958 10 26 21 55 

1958 10 27 07 35 

1958 11 05 15 00 

1958 11 19 15 02 15 60.50 150.50 

1958 11 23 22 15 

1958 11 26 04 15 59.50 139.50 

1958 11 29 13 52 43 

1958 11 29 14 34 

1958 12 11 21 00 24 

1958 12 22 02 41 29 66.00 147.00 

1959 01 09 17 25 25 

1959 01 09 18 30 

1959 01 21 04 43 

1959 01 25 07 00 

1959 01 30 05 45 

1959 02 03 05 45 16 60.00 151.00 

1959 02 04 20 19 40 59.50 138.00 

1959 02 09 18 44 

1959 02 18 03 10 

1959 02 19 21 14 14 

1959 03 07 21 26 21 

1959 03 19 09 37 53 61.50 148.00 

1959 03 25 14 00 

1959 04 12 11 13 

1959 05 14 05 27 44 

1959 06 04 12 31 56 59.50 153.00 

1959 06 07 05 36 49 

1959 06 09 06 10 

1959 06 09 07 18 

1959 06 09 09 25 

1959 07 03 05 21 13 58.53 151.76 

1959 07 17 23 21 28 60.50 153.50 

1959 07 23 06 25 

1959 07 25 08 18 

56 U.S. Geological Survey Bulletin 1840 

Mag Dep 

km 

60 

6.0 

100 

5.5 100 

150 

INTENSITY INFORMATION 

A Obs. Location INT Locality 

km Lat 0 N Lon ow MM 

64.86 147.80 3 College 

64.86 147.80 3 College 

51.86 176.66 3 Adak 

104 51.86 176.66 3 Adak 

61.60 149.08 3 Palmer 

51.86 176.66 3 Adak 

61.11 146.28 3 Valdez 

62 60.00 151.00 5 Venta 

15 60.54 150.76 3 Sterling 

49 60.38 151.35 3 Kasilof 

74 60.11 149.41 3 Seward 

82 60.95 149.30 3 Girdwood 

113 59.63 151.55 3 Homer 

60.00 151.00 3 Venta 

18 59.55 139.81 5 Yakutat 

59.18 135.38 3 Haines 

59.23 135.43 3 Haines Terminal 

59.38 135.33 3 Skagway 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

132 64.85 147.71 3 Fairbanks 

59.55 139.81 4 Yakutat 

59.63 151.55 3 Homer 

59.68 151.65 3 Homer (5 mi NW. of) 

51.86 176.66 3 Adak 

60.05 147.90 3 Latouche 

60.05 147.90 3 Latouche 

51 59.63 151.55 3 Homer 

103 59.55 139.81 4 Yakutat 

51.86 176.66 3 Adak 

61.54 149.50 3 Wasilla (3 mi S. of) 

59.68 151.65 3 Homer (5 mi NW. of) 

60.38 151.35 3 Kasilof 

60.58 151.31 3 Kenai 

62.97 155.67 4 McGrath 

102 61.11 146.28 3 Valdez 

61.11 146.28 3 Valdez 

51.86 176.66 3 Adak 

60.95 149.30 3 Girdwood 

79 59.68 151.65 3 Homer (5 mi NW. of) 

59.68 151.65 3 Homer (5 mi NW. of) 

60.38 151.35 3 Kasilof 

59.68 151.65 3 Homer (5 mi NW. of) 

59.68 151.65 3 Homer (5 mi NW. of) 

169 60.00 151.00 4 Venta 

138 59.68 151.65 3 Homer (5 mi NW. of) 

59.68 151.65 3 Homer (5 mi NW. of) 

59.68 151.65 3 Homer (5 mi NW. of) 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~ A] 

Date Time Epicent.er Mag Dep tl Ohs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

1428 1959 08 01 10 00 60.38 151.35 3 Kasilof 

1429 1959 08 01 20 05 60.11 149.41 3 Seward 

1430 1959 08 02 08 05 59.63 151.55 3 Homer 

1431 1959 08 02 10 00 60.95 149.30 3 Girdwood 

1432 1959 08 27 21 20 61.54 149.23 3 Matanuska 

61.60 149.08 3 Palmer 

1433 1959 08 28 12 07 44 63.50 149.00 162 64.86 147.80 3 College 

163 64.85 147.71 3 Fairbanks 

219 61.54 149.23 3 Matanuska 

1434 1959 08 29 18 43 60.11 149.41 3 Seward 

1435 1959 08 30 12 20 60.95 149.30 3 Girdwood 

1436 1959 11 02 13 30 44 59.00 152.00 78 59.68 151.65 3 Homer (5 mi NW. of) 

1437 1959 11 30 15 18 37 59.50 152.00 28 59.68 151.65 3 Homer {5 mi NW. of) 

105 60.38 151.35 3 Kasilof 

160 60.11 149.41 3 Seward 

1438 1959 12 03 23 40 59.50 152.00 223 61.21 149.89 3 Anchorage 

1439 1959 12 15 04 00 59.68 151.65 3 Homer (5 mi NW. of) 

1440 1959 12 24 22 00 57.75 152.50 4 Kodiak 

1441 1959 12 26 18 19 1 59.50 151.50 6.3 22 59.68 151.65 3 Homer {5 mi NW. of) 

1442 1959 12 27 06 45 59.68 151.65 3 Homer {5 mi NW. of) 

1443 1959 12 29 12 29 59.68 151.65 3 Homer (5 mi NW. of) 

1444 1960 01 02 19 28 19 59.68 151.65 3 Homer (5 mi NW. of) 

1445 1960 01 03 11 38 30 61.00 152.00 116 61.21 149.89 5 Anchorage 

148 59.68 151.65 3 Homer (5 mi NW. of) 

1446 1960 01 13 21 23 37 59.68 151.65 3 Homer (5 mi NW. of) 

1447 1960 01 16 03 41 47 59.68 151.65 3 Homer (5 mi NW. of) 

1448 1960 01 16 20 49 31 63.00 151.00 150 260 64.86 147.80 3 College 

1449 1960 01 17 08 52 63.18 147.46 3 McKinley 

1450 1960 01 19 20 44 28 59.73 151.05 3 Bear Cove 

61.46 149.36 3 Eklutna 

59.68 151.65 3 Homer (5 mi NW. of) 

1451 1960 01 27 07 52 61.54 149.23 3 Matanuska 

1452 1960 02 07 03 27 09 51.86 176.66 3 Adak 

1453 1960 02 16 07 36 51.86 176.66 3 Adak 

1454 1960 02 19 00 38 12 64.86 147.80 3 College 

1455 1960 02 19 05 09 23 60.50 151.00 93 61.17 149.97 6 Anchorage (4 mi SW. of) 

99 61.21 149.89 6 Anchorage 

82 60.91 149.75 5 Hope 

98 60.11 149.41 5 Seward 

124 60.75 148.80 5 Whittier 

161 61.60 149.08 5 Palmer 

19 60.58 151.31 4 Kenai 

88 60.48 149.40 4 Moose Pass 

145 61.58 149.50 4 Wasilla 

179 60.05 147.90 4 Latouche 

266 61.11 146.28 4 Valdez 

1456 1960 02 19 07 11 60.95 149.30 3 Girdwood 

1457 1960 02 26 23 29 25 51.50 178.00 6.1 101 51.86 176.66 3 Adak 

1458 1960 02 27 00 07 10 51.50 178.00 101 51.86 176.66 3 Adak 

Table 1-Earthquakes and Intensity Data 57 
IEq. 

No. 

1459 

1460 

1461 

1462 

1463 

1464 

1465 

1466 

1 

1 

1 

1 

467 

468 

469 

470 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1960 02 27 08 10 03 51.50 178.00 

1960 03 01 15 51 56 

1960 03 03 00 29 

1960 03 03 04 59 20 64.50 150.00 

1960 03 05 06 50 

1960 03 10 00 24 20 64.00 149.00 

1960 03 30 06 58 36 51.00 178.50 

1960 05 13 16 07 14 55.00 161.50 

1960 05 16 14 46 53 

1960 05 23 04 50 

1960 06 17 16 35 32 52.50 173.50 

1960 06 30 19 58 33 60.00 151.00 

58 U.S. Geological Survey Bulletin 1840 

~ag IDep ~ 

km km 

101 

33 

101 

112 

116 

398 

430 

436 

437 

438 

438 

439 

45 

63 

130 

135 

190 

431 

433 

433 

409 

411 

423 

436 

439 

19 

74 

365 

69 

112 

113 

115 

118 

136 

144 

265 

335 

338 

365 

160 

6.3 67 

6.1 228 

47 

51 

62 

89 

148 

INTENSITY INFORMATION 

Obs. Location INT Locality 

Lat 0 N Lon °W MM 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

63.73 148.91 3 McKinley Park 

64.58 149.33 5 Nenana 

63.73 148.91 5 McKinley Park 

64.86 147.80 5 College 

64.85 147.71 5 Fairbanks 

61.68 145.15 5 Richardson Hwy (mi 68.0) 

61.05 146.21 5 Richardson Hwy (mi 6.5) 

61.19 145.45 5 Richardson Hwy (mi 33.0) 

61.05 145.94 5 Richardson Hwy (mi 17.0) 

61.00 146.10 5 Richardson Hwy (mi 11.5) 

61.21 145.29 5 Richardson Hwy (mi 37.0) 

61.00 146.05 5 Richardson Hwy (mi 13.0) 

64.33 149.16 4 Clear 

65.00 150.63 4 Manley Hot Springs 

65.10 147.65 4 Chatanika 

63.38 148.95 4 Cantwell 

64.26 146.10 4 Shaw Creek 

61.29 145.26 4 Richardson Hwy (mi 41.0) 

61.11 145.86 4 Richardson Hwy (mi 21.0) 

61.27 145.28 4 Richardson Hwy (mi 39.0) 

61.55 145.19 3 Richardson Hwy (mi 56.0) 

61.52 145.20 3 Richardson Hwy (mi 54.0) 

61.40 145.20 3 Richardson Hwy (mi 46.0) 

61.19 145.43 3 Richardson Hwy (mi 34.0) 

61.00 146.05 3 Richardson Hwy (mi 12.5) 

61.52 145.20 5 Richardson Hwy (mi 54.0) 

61.55 145.19 5 Richardson Hwy (mi 56.0) 

63.83 149.01 5 Healy Fork 

63.50 150.00 5 McKinley N atl. Park 

61.05 145.94 5 Richardson Hwy (mi 17.0) 

63.38 148.95 4 Cantwell 

64.86 147.80 4 College 

64.85 147.71 4 Fairbanks 

64.41 146.83 4 Harding Lake 

64.66 147.10 4 Eielson AFB 

65.00 150.63 4 Manley Hot Springs 

64.26 146.10 4 Shaw Creek 

65.48 144.63 4 Circle Hot Springs 

61.55 145.19 4 Richardson Hwy (mi 56.0) 

61.52 145.20 4 Richardson Hwy (mi 54.0) 

61.21 145.29 4 Richardson Hwy (mi 37.0) 

51.86 176.66 3 Adak 

55.18 162.50 4 Cold Bay 

51.86 176.66 3 Adak 

60.95 149.30 3 Girdwood 

51.86 176.66 3 Adak 

60.38 151.35 3 Kasilof 

59.68 151.65 3 Homer ( 5 mi NW. of) 

60.54 150.76 3 Sterling 

60.11 149.41 3 Seward 

61.21 149.89 3 Anchorage 
IEq. 

No. 

1471 

1472 

1473 

1474 

1475 

1476 

1477 

1478 

1479 

1480 

1481 

1482 

1483 

1484 

1485 

1486 

1487 

1488 

1489 

1490 

1491 

1492 

1493 

1494 

1495 

1496 

1497 

1498 

1499 

1500 

1501 

1502 

1503 

1504 

1505 

1 

1 

1 

1 

1 

1 

1 

1 

506 

507 

508 

509 

510 

511 

512 

513 

EARTHQUAKE PARAMETERS 

Date Time Epicenter ~ag 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1960 07 03 08 59 23 

1960 07 03 20 20 46 50.50 177.00 6.9 

1960 07 10 02 47 37 

1960 07 16 17 57 42 

1960 07 16 21 19 38.8 65.89 167.03 4.5 

1960 07 16 22 02 54.4 65.65 167.04 4.4 

1960 07 18 00 18 

1960 08 02 06 14 48.3 51.70 178.40 

1960 08 04 07 34 48.5 51.20 179.00E 6.1 

1960 08 10 13 41 

1960 09 04 16 44 

1960 09 12 02 44 39.7 60.50 153.80 

1960 09 20 02 22 

1960 09 20 07 22 

1960 10 14 13 12 07.9 60.00 136.40 

1960 10 23 11 42 

1960 10 30 18 04 

1960 11 10 09 08 

1960 11 17 07 56 14 

1960 11 17 15 41 24 

1960 11 18 15 20 10 

1960 11 23 22 32 

1960 11 25 02 43 37 

1960 12 02 06 40 

1960 12 03 07 07 42.6 52.70 177.40 

1960 12 07 07 42 37.9 62.70 151.50 

1960 12 09 17 22 

1960 12 21 11 44 

1960 12 21 14 39 48 61.50 152.90 5.8 

1960 12 21 16 40 

1960 12 22 07 43 

1961 01 05 14 06 25.9 51.80 176.30 6.8 

1961 01 05 18 37 48.3 51.50 176.60 

1961 01 06 04 23 

1961 01 16 12 52 

1961 01 18 10 45 

1961 01 30 12 12 39.7 65.30 149.90 5.5 

1961 02 05 07 55 43.3 50.90 176.90 

1961 02 06 12 12 21.8 51.70 17 4.50 5.4 

1961 02 07 23 27 18.9 51.70 177.10 

1961 02 17 09 27 

1961 03 01 04 44 

1961 03 14 11 58 53.9 67.80 164.90 

INTENSITY INFORMATION 

IDep tl. Obs. Location INT Locality 

km km Lat 0 N Lon °W MM 

51.86 176.66 3 Adak 

153 51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

83 65.20 166.38 5 Teller 

59 65.20 166.38 5 Teller 

51.86 176.66 3 Adak 

24 121 51.86 176.66 3 Adak 

20 178 51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

195 158 59.63 151.55 3 Homer 

227 61.21 149.89 3 Anchorage 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

32 198 59.55 139.81 5 Yakutat 

221 58.30 134.41 5 Juneau 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

52.72 174.11E 3 Shemya 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

61.21 149.89 3 Anchorage 

51.86 176.66 3 Adak 

160 106 51.86 176.66 3 Adak 

36 139 63.33 149.13 3 Summit 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

125 282 63.33 149.13 3 Summit 

347 60.90 146.56 3 Copper Lake 

61.21 149.89 3 Anchorage 

62.33 150.11 3 Talkeetna 

37 26 51.86 176.66 3 Adak 

30 40 51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

65.00 150.63 3 Manley Hot Springs 

51.86 176.66 3 Adak 

34 48 65.00 150.63 5 Manley Hot Springs 

114 64.85 147.71 5 Fairbanks 

44 108 51.86 176.66 3 Adak 

34 150 51.86 176.66 3 Adak 

60 35 51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

78 1894 51.86 176.66 3 Adak 

Table 1-Earthquakes and Intensity Data 59 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I]Eq. Date Time Epicent.er Mag Dt-p 6 Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

1514 1961 03 28 12 29 12.7 51.70 176.20 6.3 60 36 51.86 176.66 3 Adak 

1515 1961 03 28 13 58 58.8 52.00 176.00 89 48 51.86 176.66 3 Adak 

1516 1961 04 04 12 52 60.58 151.31 3 Kenai 

1517 1961 04 27 02 15 51.86 176.66 3 Adak 

1518 1961 04 29 05 34 13 65.00 150.63 3 Manley Hot Springs 

1519 1961 05 17 19 29 19.3 52.20 173.90E 6.0 21 60 52.72 174.11E 3 Shemya 

1520 1961 05 26 13 57 51.86 176.66 3 Adak 

1521 1961 06 13 01 25 51.86 176.66 3 Adak 

1522 1961 06 15 10 51 51.86 176.66 3 Adak 

1523 1961 07 05 02 28 61.21 149.89 3 Anchorage 

1524 1961 07 09 08 12 62.33 150.11 3 Talkeetna 

1525 1961 07 12 16 10 60.95 149.30 3 Girdwood 

1526 1961 08 05 02 26 20.3 60.80 148.70 53 164 60.55 145.75 4 Cordova 

131 60.38 146.46 3 Hinchinbrook Island 

1527 1961 08 18 00 50 42 64.85 147.71 3 Fairbanks 

1528 1961 08 23 11 59 35 63.33 149.13 3 Summit 

1529 1961 08 29 21 35 53.26 168.21 3 Umnak 

1530 1961 09 05 11 34 37.3 60.00 150.60 6.1 43 67 60.11 149.41 6 Seward 

59 60.48 151.05 5 Soldotna 

89 60.72 151.31 5 Kenai {10 mi N. of) 

140 61.21 149.89 5 Anchorage 

197 61.60 149.08 5 Palmer 

76 60.58 151.31 4 Kenai 

59 60.38 151.35 3 Kasilof 

69 59.68 151.65 3 Homer (5 mi NW. of) 

69 60.49 149.83 3 Cooper Landing 

87 59.48 151.75 3 Seldovia 

1531 1961 09 05 14 05 60.48 151.05 3 Soldotna 

1532 1961 09 05 15 00 60.11 149.41 3 Seward 

1533 1961 09 05 18 00 60.11 149.41 3 Seward 

1534 1961 09 05 22 01 60.11 149.41 3 Seward 

1535 1961 09 06 00 01 60.11 149.41 3 Seward 

1536 1961 09 06 04 00 60.11 149.41 3 Seward 

1537 1961 09 06 17 30 60.11 149.41 3 Seward 

1538 1961 09 07 03 30 59.68 151.65 3 Homer (5 mi NW. of) 

1539 1961 09 07 03 45 60.11 149.41 3 Seward 

1540 1961 09 07 05 30 60.11 149.41 3 Seward 

1541 1961 09 12 05 38 01.3 63.40 149.40 50 16 63.33 149.13 3 Summit 

44 63.73 148.91 3 McKinley Park 

1542 1961 09 25 00 00 60.95 149.30 3 Girdwood 

1543 1961 09 25 02 27 13.4 60.50 153.00 5.9 125 118 59.68 151.65 3 Homer (5 mi NW. of) 

1544 1961 09 28 20 21 59.68 151.65 3 Homer (5 mi NW. of) 

1545 1961 10 12 07 09 56.89 154.24 3 Lazy Bay 

546 1961 10 16 13 49 51.86 176.66 3 Adak 

547 1961 10 27 01 41 19 51.86 176.66 3 Adak 

1 548 1961 10 27 09 59 51.86 176.66 3 Adak 

549 1961 10 30 14 57 51.86 176.66 3 Adak 

1 550 1961 11 19 00 35 12.1 51.30 178.50 60 142 51.86 176.66 3 Adak 

60 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~Eq. Date Time Epicent.er Mag Dep 6 Obs. Locat.ion INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat. 0 N Lon °W MM 

1551 1961 11 19 19 06 17 59.63 151.55 3 Homer 

1552 1961 11 22 10 18 15 51.70 177.10 33 35 51.86 176.66 3 Adak 

1553 1961 12 03 04 00 62.33 150.11 3 Talkeetna 

1554 1961 12 05 17 27 42 67.41 150.10 3 Wiseman 

1555 1961 12 05 20 22 51 62.33 150.11 3 Talkeetna 

1556 1961 12 06 23 33 47 3 Devils Club 

60.95 149.30 3 Girdwood 

1557 1961 12 11 09 30 62.33 150.27 3 Talkeetna ( 5 mi W. of) 

1558 1961 12 19 18 41 17 60.11 149.41 3 Seward 

1559 '1961 12 24 02 04 18.8 65.90 150.20 33 102 65.00 150.63 4 Manley Hot Springs 

1560 1961 12 24 16 53 57 60.11 149.41 3 Seward 

1561 1961 12 25 14 25 16.9 60.90 147.70 33 3 Devils Club 

87 60.95 149.30 3 Girdwood 

1562 1962 02 27 05 52 28.5 63.00 150.00 100 231 60.95 149.30 3 Girdwood 

1563 1962 02 28 18 04 09 51.60 179.60 60 205 51.86 176.66 3 Adak 

1564 1962 03 15 09 04 55 61.21 149.89 4 Anchorage 

1565 1962 03 26 04 57 04 59.55 139.81 4 Yakutat 

1566 1962 03 28 22 26 41 60.58 151.31 3 Kenai 

1567 1962 04 06 12 52 24 65.00 150.63 3 Manley Hot Springs 

1568 1962 04 14 01 14 13.7 59.60 152.10 78 27 59.68 151.65 3 Homer (5 mi NW. of) 

1569 1962 05 10 00 03 40.2 62.00 150.10 6.0 72 89 61.21 149.89 5 Anchorage 

37 62.33 150.11 3 Talkeetna 

68 61.47 150.73 3 Mount Susitna 

125 60.95 149.30 3 Girdwood 

189 63.18 147.46 3 McKinley 

214 60.11 149.41 3 Seward 

226 61.11 146.28 3 Valdez 

339 64.85 147.71 3 Fairbanks 

1570 1962 05 21 11 11 54 60.95 149.30 3 Girdwood 

1571 1962 05 22 16 51 57 62.33 150.11 3 Talkeetna 

1572 1962 05 29 21 00 16.4 51.80 177.10 25 31 51.86 176.66 3 Adak 

1573 1962 06 13 16 20 34 59.63 151.55 3 Homer 

1574 1962 06 18 06 21 06.1 60.50 153.70 174 154 59.63 151.55 3 Homer 

1575 1962 06 20 08 21 39 51.86 176.66 3 Adak 

1576 1962 06 21 10 42 59.63 151.55 3 Homer 

1577 1962 06 22 16 56 57 63.73 148.91 3 McKinley Park 

1578 1962 06 29 16 28 07.1 62.40152.00 4.8 50 173 61.21 149.89 4 Anchorage 

90 62.33 150.27 3 Talkeetna (5 mi W. of) 

216 60.95 149.30 3 Girdwood 

1 579 1962 07 06 18 40 59.4 60.30 152.10 67 54 60.58 151.31 3 Kenai 

73 59.68 151.65 3 Homer (5 mi NW. of) 

1580 1962 07 09 09 52 34 53.26 168.21 3 Umnak 

581 1962 07 15 10 61.11 146.28 3 Valdez 

582 1962 07 16 12 54 40.6 62.30 153.10 6.0 39 34 62.00 153.00 5 Puntilla 

48 62.46 153.96 5 Farewell 

151 62.97 155.67 5 McGrath 

208 61.21 149.89 5 Anchorage 

147 62.33 150.27 4 Talkeetna (5 mi W. of) 

265 63.73 148.91 4 McKinley Park 

Table 1-Earthquakes and Intensity Data 61 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I:Eq. Da.te Time Epicenter Mag D<>p A Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat. 0 N Lon ow MM 

1582 1962 07 16 12 54 40.6 62.30 153.10 6.0 39 302 59.68 151.65 4 Homer (5 mi NW. of) 

1583 1962 08 15 11 20 44.5 51.80 177.00 53 24 51.86 176.66 3 Adak 

1584 1962 08 16 10 10 59.63 151.55 3 Homer 

1585 1962 08 17 16 30 61.66 157.18 4 Sleetmute 

1586 1962 08 17 17 00 61.66 157.18 4 Sleetmute 

1587 1962 08 18 16 43 54.3 62.30 152.50 6.1 32 149 61.68 149.98 5 Nancy Lake 

196 61.60 149.08 5 Palmer 

262 60.48 149.40 5 Moose Pass 

78 62.46 153.96 4 Farewell 

184 61.21 149.89 4 Anchorage 

202 60.58 151.31 4 Kenai 

238 61.54 148.26 4 Matanuska (1 mi W. of) 

179 62.97 155.67 3 McGrath 

302 59.63 151.55 3 Homer 

1588 1962 08 18 17 46 14.9 62.30 152.50 6.4 32 149 61.68 149.98 5 Nancy Lake 

196 61.60 149.08 5 Palmer 

262 60.48 149.40 5 Moose Pass 

1589 1962 08 30 13 09 59.63 151.55 3 Homer 

1590 1962 08 31 17 02 44.4 51.30 179.70 6.8 32 220 51.86 176.66 3 Adak 

1591 1962 09 01 03 46 05 51.30 179.70 6.5 25 220 51.86 176.66 3 Adak 

1592 1962 09 01 04 41 41.5 51.30 179.90 37 233 51.86 176.66 3 Adak 

1593 1962 09 14 03 30 60.38 151.35 3 Kasilof 

1594 1962 09 15 12 24 10 62.33 150.11 3 Talkeetna 

1595 1962 09 23 15 50 46.4 60.10 151.20 86 32 60.38 151.35 3 Kasilof 

53 59.68 151.65 3 Homer (5 mi NW. of) 

100 60.11 149.41 3 Seward 

1596 1962 09 25 11 48 54 59.68 151.65 3 Homer (5 mi NW. of) 

1597 1962 10 20 02 00 60.38 151.35 3 Kasilof 

60.58 151.31 3 Kenai 

61.11 146.28 3 Valdez 

1598 1962 10 21 02 05 22.7 61.10 149.70 80 16 61.21 149.89 6 Anchorage 

27 60.95 149.30 6 Girdwood 

55 61.58 149.50 6 WasiJia 

105 60.58 151.31 5 Kenai 

65 61.54 150.51 4 Susitna 

101 60.48 151.05 4 Soldotna 

1599 1962 11 08 18 37 53.26 168.21 3 Umnak 

1600 1962 11 12 18 34 23 62.33 150.27 3 Talkeetna ( 5 mi W. of) 

1601 1962 12 12 22 18 63.33 149.13 3 Summit 

1602 1962 12 13 04 21 21.2 63.30 149.70 47 29 63.33 149.13 3 Summit 

233 61.21 149.89 3 Anchorage 

1603 1962 12 13 14 57 27.9 61.40 147.20 69 146 61.21 149.89 5 Anchorage 

123 60.55 145.75 4 Cordova 

59 61.11 146.28 3 Valdez 

125 61.73 144.94 3 Kenny Lake 

1604 1963 03 14 00 32 59.63 151.55 3 Homer 

1605 1963 03 24 20 35 51.86 176.66 3 Adak 

1606 1963 03 29 13 29 30 61.11 146.28 3 Valdez 

1607 1963 04 01 22 56 57 53.26 168.21 3 Umnak 

1608 1963 04 03 16 05 61.11 146.28 3 Valdez 

62 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~Eq Dat.e Time Epicenter IMag Dep A Ob~. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W ~M 

1609 1963 04 11 00 13 44.3 51.90 1 '16.20 4.4 'TO 32 51.86 176.66 3 Adak 

1610 1963 04 28 15 15 61.11 146.28 3 Valdez 

1611 1963 04 30 08 46 51.86 176.66 3 Adak 

1612 1963 05 01 00 0'1 51.86 176.66 3 Adak 

1613 1963 05 03 16 57 51.86 176.66 3 Adak 

1614 1963 05 0'1 13 08 51.86 176.66 3 Adak 

1615 1963 05 08 08 50 56.3 54.90 163.80 5.8 90 89 55.18 162.50 4 Cold Bay 

1616 1963 05 12 20 08 43 57.30 154.00 6.1 60 48 56.89 154.24 3 Lazy.Bay 

131 57.36 156.18 3 Wide Bay 

1617 1963 06 23 03 00 59.63 151.55 3 Homer 

1618 1963 06 24 04 26 3'1.9 59.50 151.'10 5.'1 52 4 59.48 151.75 '1 Seldovia 

4 59.49 151.64 '1 Barabara Point 

17 59.63 151.55 7 Homer 

20 59.68 151.65 5 Homer (5 mi NW. of) 

215 61.21 149.89 5 Anchorage 

352 60.55 145.75 4 Cordova 

1619 1963 06 24 16 25 58.30 134.41 4 Juneau 

1620 1963 07 08 02 15 05.9 57.00 134.50 3.7 28 22 57.08 134.83 3 Baran of 

61 57.06 135.50 3 Sitka 

1621 1963 0'1 2'1 09 56 53.26 168.21 3 Umnak 

1622 1963 08 10 20 03 39.2 49.60 1 79.20E 4.3 33 309 51.86 176.66 3 Adak 

1623 1963 08 15 0'1 48 51.86 176.66 3 Adak 

1624 1963 09 01 15 30 63.41 145.70 3 Thims Camp 

1625 1963 09 29 02 04 59.63 151.55 3 Homer 

1626 1963 10 04 0'1 34 33 51.86 176.66 3 Adak 

1627 1963 10 0'1 04 26 62.00 153.00 3 Puntilla 

1628 1963 10 12 18 09 59 3 Alaska Highway (mi 1202) 

1629 1963 10 15 09 26 09.4 59.00 136.80 4.3 33 86 58.41 135.83 3 Gustavus 

159 58.30 134.41 3 Juneau 

1630 1963 10 16 09 26 18 3 Linger Longer 

1631 1963 10 18 02 34 51.86 176.66 3 Adak 

1632 1963 10 18 08 05 22.1 62.60 146.60 4.2 51 183 62.33 150.11 3 Talkeetna 

1633 1963 10 24 04 15 37 61.68 149.03 3 Moose Creek 

1634 1963 11 04 22 20 65.00 150.63 3 Manley Hot Springs 

1635 1963 11 04 22 38 65.00 150.63 3 Manley Hot Springs 

1636 1963 12 05 02 2'1 51.86 176.66 3 Adak 

1637 1963 12 08 04 18 65.00 148.00 18 64.86 147.80 5 College 

22 64.85 147.71 4 Fairbanks 

27 64.85 147.55 3 Fort Wainwright 

1638 1963 12 09 08 51 05 64.86 147.80 3 College 

1639 1963 12 11 16 08 12.3 51.20 179.30E 5.3 32 197 51.86 176.66 3 Adak 

1640 1963 12 20 19 30 61.68 149.03 3 Moose Creek 

1641 1963 12 23 17 15 61.68 149.03 3 Moose Creek 

1642 1964 01 04 05 1'1 51.86 176.66 3 Adak 

1643 1964 01 06 18 31 10 59.50 151.50 15 59.63 151.55 5 Homer 

1644 1964 01 08 02 11 18 51.40 179.00 4.2 33 170 51.86 176.66 3 Adak 

1645 1964 01 12 06 00 13.2 53.20 166.30 5.5 33 128 53.26 168.21 3 Umnak 

1646 1964 01 20 00 46 59.63 151.55 3 Homer 

Table !-Earthquakes and Intensity Data 63 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~ Date Time Epicenter Mag Dep ~ 0 bs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat. 0 N Lon °W km km Lat 0 N Lon °W ~M 

1647 1964 01 24 06 42 53.9 60.40 146.50 3.7 33 294 59.63 151.55 3 Homer 

1648 1964 01 26 04 47 51.86 176.66 3 Adak 

1649 1964 02 06 13 07 25.2 55.70 155.80 6.9 33 139 56.55 154.16 5 Sitkinak Island 

178 56.30 158.45 5 Chignik 

1650 1964 02 06 13 13 45.2 55.80 155.90 5.4 33 137 56.55 154.16 5 Sitkinak Island 

168 56.30 158.45 5 Chignik 

1651 1964 03 03 22 30 63.35 143.50 3 Tanacross 

1652 1964 03 28 60.23 146.65 4 Cape Hinchinbrook 

57.05 135.35 3 Mount Edgecumbe 

63.86 160.83 3 Unalakleet 

1653 1964 03 28 03 36 14.2 61.04 147.73 8.3 33 72 60.83 148.98 10 Portage 

117 60.00 147.50 10 Montague Island 

66 60.75 148.80 8 Whittier 

79 61.11 146.28 8 Valdez 

110 60.48 149.40 8 Moose Pass 

110 60.91 149.75 8 Hope 

118 61.21 149.89 8 Anchorage 

124 62.03 146.68 8 Snowshoe Lake 

139 60.11 149.41 8 Seward 

166 62.11 145.55 8 Glennallen 

180 61.50 144.52 8 Chitina 

7 Glenn Hwy (mi 95.0} 

7 Glenn Hwy (mi 113.0} 

7 Glenn Hwy (mi 127.0) 

7 Richardson Hwy (mi 83.5) 

7 Richardson Hwy (mi 89.0) 

7 Richardson Hwy (mi 101.5) 

37 60.80 148.20 7 Port Wells 

85 60.95 149.30 7 Girdwood-Portage 

92 61.47 149.20 7 Glenn Hwy (mi 55.5) 

91 61.73 148.65 7 Glenn Hwy (mi 94.0) 

89 61.83 147.52 7 Sheep Mountain Lodge 

93 61.64 148.95 7 Glenn Hwy (mi 72.0} 

95 61.60 149.08 7 Palmer 

96 61.71 148.86 7 Sutton 

99 61.46 149.36 7 Eklutna 

100 61.30 149.51 7 Glenn Hwy (mi 42.0} 

107 61.33 149.63 7 Eagle River 

112 61.33 149.73 7 Eagle River Valley 

112 61.58 149.50 7 Wasilla 

121 60.55 145.75 7 Cordova 

130 60.49 149.83 7 Cooper Landing 

132 62.06 146.45 7 Tazlina 

156 61.70 145.16 7 Richardson Hwy (mi 82.5) 

170 60.00 150.00 7 Kenai Peninsula 

167 60.60 144.80 7 Copper River Highway 

174 60.54 150.76 7 Sterling 

164 61.95 145.30 7 Copper Center 

165 62.13 145.63 7 Copper Valley School 

173 62.11 145.36 7 Glennallen (6 mi E. of) 

174 62.13 145.39 7 Richardson Hwy (mi 111.0) 

175 62.15 145.39 7 Richardson Hwy (mi 111.5) 

478 65.18 150.21 7 Eureka 

191 60.48 151.05 7 Soldotna 

64 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

IEq. Date Time Epicenter Mag Dep 1::1 Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon ow km km Lat. 0 N Lon ow ~M 

1653 1964 03 28 03 36 14.2 61.04 147.73 8.3 33 196 60.62 151.23 7 Kenai (Wildwood Station) 

201 60.58 151.31 7 Kenai 

192 62,35 145.37 7 Richardson Hwy (mi 127.0) 

197 62.41 150.10 7 Susitna River Valley 

211 60.38 151.35 7 Kasilof 

210 61.96 151.18 7 Skwentna 

217 60.01 144.38 7 Wingham Island 

263 59.63 151.55 7 Homer 

282 59.48 151.75 7 Seldovia 

311 60.07 142.41 7 Cape Yakataga 

456 57.75 152.50 7 Kodiak 

462 57.68 152.48 7 Spruce Cape 

534 57.21 153.33 7 Old Harbor 

623 56.55 154.16 7 Sitkinak Island 

96 60.80 149.43 6 Hope Junction 

104 61.42 149.50 6 Chugiak 

148 61.70 150.13 6 Willow 

191 62.33 150.11 6 Talkeetna 

195 59.43 146.33 6 Middleton Island 

192 62.35 145.37 6 Richardson Hwy (mi 218.0) 

198 62.33 145.15 6 Gakona 

237 62.97 149.63 6 Hurricane 

234 62.56 144.66 6 Chistochina 

235 62.56 144.63 6 Sinona Creek 

239 62.92 145.53 6 Paxon Lake 

251 63.03 145.49 6 Paxon Lodge 

265 63.33 149.13 6 Summit 

271 62.70 143.96 6 Slana 

282 63.50 149.00 6 Denali Lakes 

298 63.50 150.00 6 McKinley Natl. Park 

318 63.83 149.01 6 Healy Fork 

349 64.03 145.73 6 Delta Junction 

361 60.25 154.13 6 Port Alsworth 

354 63.08 142.53 6 Tetlin 

354 63.31 142.98 6 Tok 

390 64.46 149.33 6 Nenana (8 mi S. of) 

408 60.00 154.86 6 Nondalton 

403 64.58 149.33 6 Nenana 

425 64.85 147.71 6 Fairbanks 

426 64.86 147.80 6 College 

435 64.89 149.18 6 Minto 

468 62.97 155.67 6 McGrath 

468 59.55 139.81 6 Yakutat 

513 65.18 152.16 6 Tanana 

519 65.48 144.63 6 Circle Hot Springs 

524 65.57 144.90 6 Central 

550 65.37 142.50 6 Kandik River 

566 58.67 156.66 6 King Salmon 

578 58.75 157.00 6 Naknek 

582 58.68 157.00 6 South Naknek 

590 66.26 145.81 6 Birch Creek 

632 58.18 157.40 6 Egegik 

628 66.57 145.30 6 Fort Yukon 

647 62.58 159.58 6 Shageluk 

681 57.57 157.58 6 Pilot Point 

Table 1-Earthquakes and Intensity Data 65 
l~q. No. 

1653 

1 

1 

654 

655 

EARTHQUAKE PARAMETERS 

Dat.e Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat. 0 N Lon °W 

1964 03 28 03 36 14.2 61.04 147.73 

1964 03 28 03 48 

1964 03 28 04 15 

66 U.S. Geological Survey Bulletin 1840 

Mag Dep A 

km km 

8.3 33 810 

212 

263 

264 

268 

323 

365 

437 

510 

527 

559 

563 

569 

636 

639 

711 

744 

745 

765 

816 

910 

950 

972 

273 

316 

339 

465 

716 

716 

717 

744 

769 

1029 

1088 

1241 

65 

92 

300 

487 

501 

656 

717 

790 

816 

830 

847 

973 

981 

1212 

1277 

1429 

2056 

INTENSITY INFORMATION 

Obs. Location INT Locality 

La.t 0 N Lon °W MM 

58.30 134.41 6 Juneau 

62.61 150.01 5 Curry 

63.26 149.45 5 Gold Creek 

62.70 144.16 5 Cobb Lake 

63.38 148.95 5 Cantwel1 

62.07 142.05 5 Chisana 

62.46 153.96 5 Farewe11 

59.50 155.00 5 Iliamna Lake 

61.66 157.18 5 Sleetmute 

64.76 141.33 5 Eagle 

64.93 154.70 5 Kokrines 

65.83 144.18 5 Circle 

64.68 155.58 5 Ruby 

59.28 158.63 5 Aleknagik 

59.05 158.50 5 Dillingham 

59.38 135.33 5 Skagway 

59.08 160.50 5 Togiak 

63.86 160.83 5 Unalakleet 

60.78 161.83 5 Bethel 

56.30 158.45 5 Chignik 

69.20 148.35 5 Sal Lake 

69.36 152.13 5 Umiat 

66.82 162.60 5 Kotzebue 

4 Canyon Village 

61.35 142.69 4 May Creek 

63.82 148.97 4 Garner 

63.35 143.50 4 Tanacross 

65.00 150.63 4 Manley Hot Springs 

67.46 148.11 4 Lake Chand alar ( 10 mi E of 

67.46 148.21 4 Steese Highway 

67.46 148.49 4 Lake Chandalar 

67.50 151.58 4 Wild Lake 

58.10 135.41 4 Hoonah 

70.11 143.66 4 Barter Island 

55.18 162.50 4 Cold Bay 

54.75 165.00 4 Unimak Island 

60.90 146.56 3 Copper Lake 

61.79 148.46 3 Chi 

62.00 153.00 3 PuntilJa 

57.76 153.40 3 Uganik 

65.52 148.54 3 Livengood 

62.16 159.88 3 Holy Cross 

59.18 135.38 3 Haines 

68.08 145.78 3 Arctic Vi1lage 

65.11 161.16 3 Dime Landing 

57.06 135.50 3 Sitka 

57.50 134.58 3 Angoon 

56.81 132.95 3 Petersburg 

64.50 165.41 3 Nome 

70.65 160.16 3 Wainwright 

63.76 171.75 3 Gambe11 

69.10 171.40 3 Ship on Chukchi Sea 

51.86 176.66 3 Adak 

65.00 150.63 3 Manley Hot Springs 

65.00 150.63 3 Manley Hot Springs 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~~~· Dat.e Time Epicenter Mag Dep ~ Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

1656 1964 03 28 04 54 07.9 59.80 149.40 6.1 25 178 59.43 146.33 3 Middleton Island 

1657 1964 03 28 07 10 21.4 58.80 149.50 6.1 20 195 59.43 146.33 4 Middleton Island 

1658 1964 03 28 07 30 29.6 57.40 151.70 5.7 15 62 57.73 152.53 3 Kodiak Naval Station 

1659 1964 03 28 08 39 54.9 57.50 151.60 5.4 20 61 57.73 152.53 3 Kodiak Naval Station 

1660 1964 03 28 10 35 38.9 57.20 152.40 6.0 33 60 57.73 152.53 3 Kodiak Naval Station 

1661 1964 03 28 12 03 16.5 60.30 146.60 5.4 15 197 61.95 145.30 3 Copper Center 

1662 1964 03 28 12 20 49.8 56.50 154.00 6.1 25 163 57.73 152.53 3 Kodiak Naval Station 

1663 1964 03 28 14 33 13.6 57.80 152.10 4.9 25 27 57.73 152.53 3 Kodiak Naval Station 

1664 1964 03 28 14 46 19.2 57.80 151.30 4.8 33 74 57.73 152.53 3 Kodiak Naval Station 

1665 1964 03 28 20 29 08.6 59.80 148.70 5.8 40 170 61.21 149.89 5 Anchorage 

1666 1964 03 29 57.05 135.35 3 Mount Edgecumbe 

63.86 160.83 3 Unalakleet 

1667 1964 03 29 02 25 25.1 57.00 151.70 5.2 20 95 57.73 152.53 3 Kodiak Naval Station 

1668 1964 03 29 02 59 57.73 152.53 3 Kodiak Naval Station 

1669 1964 03 29 04 51 53.3 56.80 152.40 4.8 40 1671 51.86 176.66 3 Adak 

1670 1964 03 29 05 02 57.73 152.53 3 Kodiak Naval Station 

1671 1964 03 29 05 08 25.8 56.70 152.70 4.6 20 115 57.73 152.53 3 Kodiak Naval Station 

1672 1964 03 29 06 53 19.5 56.10 154.50 4.8 25 1528 51.86 176.66 3 Adak 

1673 1964 03 29 08 07 52.3 56.50 152.60 4.9 20 137 57.73 152.53 3 Kodiak Naval Station 

143 57.78 152.35 3 Woody Island 

1674 1964 03 29 08 26 57.73 152.53 3 Kodiak Naval Station 

1675 1964 03 29 11 44 04.3 60.00 149.10 4.9 25 139 60.23 146.65 3 Cape Hinchinbrook 

1676 1964 03 30 63.86 160.83 3 Unalakleet 

1677 1964 03 30 07 56 29.1 56.30 154.40 5.0 20 1538 51.86 176.66 3 Adak 

1678 1964 03 30 11 48 40.4 56.40 152.50 5.2 20 1658 51.86 176.66 3 Adak 

1679 1964 03 30 12 14 28.4 58.00 151.60 5.0 25 63 57.73 152.53 3 Kodiak Naval Station 

1680 1964 03 30 13 03 34.9 56.50 152.70 5.3 20 1647 51.86 176.66 3 Adak 

1681 1964 03 30 14 10 48.6 57.40 152.30 5.1 30 39 57.73 152.53 3 Kodiak Naval Station 

1682 1964 04 03 22 33 42.2 61.60 147.60 5.7 40 130 61.21 149.89 5 Anchorage 

57 61.73 148.65 3 Glenn Hwy (mi 94.0) 

89 61.11 146.28 3 Valdez 

116 60.95 149.30 3 Girdwood 

122 62.11 145.55 3 Glennallen 

127 61.95 145.30 3 Copper Center 

164 61.50 144.52 3 Chitina 

287 63.35 143.50 3 Tanacross 

362 64.85 147.71 3 Fairbanks 

508 61.66 157.18 3 Sleetmute 

510 57.75 152.50 3 Kodiak 

1683 1964 04 04 09 10 55.1 56.90 152.70 5.9 15 93 57.73 152.53 3 Kodiak Naval Station 

1684 1964 04 04 22 16 54.5 59.40 145.20 5.1 10 237 61.50 144.52 3 Chitina 

1685 1964 04 10 61.66 157.18 3 Sleetmute 

1686 1964 04 12 14 35 39.2 61.20 151.10 5.0 28 65 61.21 149.89 4 Anchorage 

1687 1964 04 13 12 25 36 59.40 143.90 4.9 40 112 60.07 142.41 3 Cape Yakataga 

1688 1964 04 13 16 14 06.3 56.60 152.10 5.1 33 529 61.21 149.89 3 Anchorage 

1689 1964 04 14 15 32 58.6 61.57 149.76 4.1 41 61.21 149.89 4 Anchorage 

1690 1964 04 14 15 55 10.9 61.30 147.30 5.4 30 139 61.21 149.89 4 Anchorage 

1691 1964 04 14 16 15 61.21 149.89 4 Anchorage 

Table 1-Earthquakes and Intensity Data 67 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

IEq. Da.t.e Time Epicenter Mag Dep 6 Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

1692 1964 04 14 16 59 30.1 61.40 150.80 5.1 35 53 61.21 149.89 4 Anchorage 

1693 1964 04 14 18 20 61.21 149.89 4 Anchorage 

1694 1964 04 14 22 55 31.3 58.00 152.60 5.4 30 28 57.75 152.50 6 Kodiak 

1695 1964 04 16 14 31 16.3 61.40 149.20 4.6 33 43 61.21 149.89 4 Anchorage 

1696 1964 04 16 17 08 27.2 59.50 147.80 4.5 33 182 60.95 149.30 3 Girdwood 

1697 1964 04 17 21 16 51.86 176.66 3 Adak 

1698 1964 04 20 11 56 41.6 61.40 147.30 5.7 30 62 61.10 146.33 3 USCGSS Surveyor (Ship) 

119 60.95 149.30 3 Girdwood 

140 61.21 149.89 3 Anchorage 

149 61.50 144.52 3 Chitina 

1699 1964 04 20 15 40 28 61.50 147.30 5.0 30 124 60.95 149.30 3 Girdwood 

142 61.21 149.89 3 Anchorage 

148 61.50 144.52 3 Chitina 

1700 1964 04 21 04 17 61.21 149.89 3 Anchorage 

1701 1964 04 21 05 01 35.7 61.50 147.40 5.4 40 80 61.06 146.21 3 USCGSS Surveyor (Ship) 

137 61.21 149.89 3 Anchorage 

1702 1964 04 25 06 56 30 51.86 176.66 3 Adak 

1703 1964 04 26 17 45 3 Linger Longer 

1704 1964 04 29 17 27 58.20 150.70 518 60.07 142.41 3 Cape Yakataga 

1705 1964 04 30 18 03 60.95 149.30 3 Girdwood 

1706 1964 04 30 21 45 3 Linger Longer 

1707 1964 05 03 61.66 157.18 3 Sleetmute 

1708 1964 05 07 03 09 49.6 51.86 176.66 3 Adak 

1709 1964 05 12 06 43 56.0 60.58 151.31 3 Kenai 

1710 1964 05 15 05 11 17.3 61.40 147.90 3.7 33 206 60.58 151.31 3 Kenai 

1711 1964 05 21 06 05 61.21 149.89 3 Anchorage 

1712 1964 05 21 13 31 50.9 60.20 147.20 4.2 33 185 61.21 149.89 3 Anchorage 

1713 1964 05 21 15 36 01.5 59.00 153.50 5.3 15 85 59.50 154.62 3 Intricate Bay 

1714 1964 05 22 14 15 59.50 154.62 3 Intricate Bay 

1715 1964 05 25 07 30 59.50 154.62 3 Intricate Bay 

1716 1964 05 28 22 47 38.0 53.70 167.80 4.7 33 56 53.26 168.21 3 Umnak 

1717 1964 05 29 10 17 34.5 60.20 146.30 5.6 5 525 64.86 147.80 3 College 

1718 1964 06 02 16 09 23.5 59.70 144.40 5.1 15 119 60.07 142.41 3 Cape Yakataga 

1719 1964 06 05 09 50 35.0 60.40 146.00 5.2 15 230 61.21 149.89 3 Anchorage 

1720 1964 06 10 17 22 35.0 64.85 147.71 3 Fairbanks 

1721 1964 06 12 17 18 06.0 64.85 147.71 3 Fairbanks 

1722 1964 06 29 07 21 32.8 62.70 152.00 5.6 33 189 62.97 155.67 4 McGrath 

195 61.60 149.08 3 Palmer 

200 61.21 149.89 3 Anchorage 

317 64.86 147.80 3 College 

1723 1964 07 23 19 08 06.6 59.90 149.20 5.4 55 26 60.11 149.41 3 Seward 

139 60.58 151.31 3 Kenai 

151 61.21 149.89 3 Anchorage 

1724 1964 07 25 04 41 41.8 64.86 147.80 4 College 

64.85 147.71 4 Fairbanks 

1725 1964 07 27 23 20 56.2 60.90 148.00 4.2 33 108 61.21 149.89 3 Anchorage 

1726 1964 08 02 08 36 16.9 56.20 149.90 5.4 31 394 59.63 151.55 3 Homer 

1727 1964 08 11 03 30 63.41 145.70 3 Trims Camp 

68 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

l~q. Date Time Epicenter Mag Dep 6 Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon ow km km La.t. 0 N Lon ow MM 

1728 1964 08 11 21 57 63.41 145.70 3 Trims Camp 

1729 1964 08 14 15 24 51.86 176.66 3 Adak 

1730 1964 08 26 10 57.52 153.99 4 Larsen Bay 

1731 1964 08 30 13 03 59.63 151.55 3 Homer 

1732 1964 09 13 17 44 10.2 61.40 149.80 3.9 33 22 61.21 149.89 3 Anchorage 

1733 1964 09 16 01 30 60.00 147.10 204 61.21 149.89 3 Anchorage 

1734 1964 09 16 01 50 33.9 60.00 147.10 5.5 29 204 61.21 149.89 3 Anchorage 

1735 1964 09 23 16 37 19.1 61.60 150.00 4.1 33 3 Tolovamkorga 

1736 1964 09 24 22 39 51.86 176.66 3 Adak 

1737 1964 09 28 18 30 20.2 61.00 147.40 4.5 89 136 61.21 149.89 3 Anchorage 

1738 1964 10 18 21 45 10.4 60.30 152.30 4.1 96 86 59.63 151.55 3 Homer 

1739 1964 10 27 07 50 3 Tolovamkorga 

1740 1964 11 01 08 46 51.86 176.66 3 Adak 

1741 1964 11 07 06 21 65.00 150.63 3 Manley Hot Springs 

1742 1964 11 07 06 50 65.00 150.63 3 Manley Hot Springs 

1743 1964 11 20 21 27 39.5 63.70 146.50 4.6 80 246 65.00 150.63 3 Manley Hot Springs 

1744 1964 11 23 11 47 54.4 64.86 147.80 3 College 

1745 1964 11 27 03 37 02.6 65.30 151.40 4.2 33 49 65.00 150.63 3 Manley Hot Springs 

1746 1964 11 27 07 47 07.6 62.60 151.50 5.4 113 176 61.21 149.89 4 Anchorage 

145 63.33 149.13 3 Summit 

1747 1964 12 13 00 33 24.7 64.90 165.70 5.4 15 47 64.50 165.41 6 Nome 

46 65.20 166.38 6 Teller 

238 63.48 162.03 4 Saint Michael 

247 62.75 164.46 4 Emmonak 

1748 1964 12 17 23 44 46.2 51.40 177.90 5.5 57 100 51.86 176.66 3 Adak 

1749 1964 12 20 08 45 57.5 52.10 177.10 4.3 140 40 51.86 176.66 3 Adak 

1750 1964 12 29 05 39 51.86 176.66 3 Adak 

1751 1965 01 03 23 13 50.4 60.20 151.20 5.6 93 66 59.63 151.55 3 Homer 

1752 1965 01 04 03 41 22.9 59.90 153.60 5.4 122 119 59.63 151.55 3 Homer 

1753 1965 01 06 18 27 34.0 60.00 151.80 5.2 53 44 59.63 151.55 3 Homer 

1754 1965 01 07 06 23 59.63 151.55 3 Homer 

1755 1965 01 27 21 12 51.86 176.66 3 Adak 

1756 1965 02 04 05 01 21.8 51.30 178.60E 6.0 40 148 51.86 176.66 6 Adak 

346 52.72 174.11E 6 Shemya 

409 52.94 173.25E 6 Attu 

1757 1965 02 04 07 40 27 50.90 177. 70E 5.0 33 129 51.86 176.66 3 Adak 

320 52.72 174.11E 3 Shemya 

381 52.94 173.25E 3 Attu 

1758 1965 02 04 08 13 52.94 173.25E 3 Attu 

1759 1965 02 04 08 59 52.94 173.25E 3 Attu 

1760 1965 02 04 12 06 52.94 173.25E 3 Attu 

1761 1965 02 04 14 20 52.94 173.25E 3 Attu 

1762 1965 02 04 15 56 52.94 173.25E 3 Attu 

1763 1965 02 06 01 40 33.2 53.20 161.90 6.4 33 233 54.40 164.79 3 Scotch Cap 

1764 1965 02 06 01 50 55.18 162.50 3 Cold Bay 

1765 1965 02 06 15 50 55.18 162.50 3 Cold Bay 

1766 1965 02 06 16 50 28.6 53.30 161.80 6.1 33 214 55.18 162.50 4 Cold Bay 

1767 1965 02 12 06 22 51.86 176.66 3 Adak 

Table 1-Earthquakes and Intensity Data 69 
~Eq. No. 

1768 

1769 

1770 

1771 

1772 

1773 

1774 

1775 

1776 

1777 

1778 

1779 

1780 

1781 

1782 

1783 

1784 

1785 

1786 

1787 

1788 

1789 

1790 

1791 

1792 

1793 

1794 

1795 

1796 

1797 

1 

1 

798 

799 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1965 02 18 23 13 36.3 51.40 179.10E 

1965 02 24 10 50 

1965 03 16 18 24 15.2 52.10 175.00E 

1965 03 17 04 33 40.7 51.10 178.30 

1965 03 17 07 29 

1965 03 17 14 27 12.4 52.80 171.90E 

1965 03 23 23 35 

1965 03 28 07 23 

1965 03 30 02 27 07.2 50.60 177.90E 

1965 03 31 02 00 

1965 04 10 00 12 44.2 50.80 175.80E 

1965 04 16 23 22 18.6 64.70 160.10 

1965 04 17 00 00 29.7 52.60 173.10E 

1965 04 20 06 43 08.8 52.40 172.00E 

1965 04 26 11 58 

1965 04 26 20 29 07.4 54.50 162.60 

1965 05 11 17 37 38.3 61.40 149.60 

1965 05 27 19 55 

1965 06 01 19 41 37.9 65.10 147.00 

1965 06 12 22 08 

1965 06 24 18 25 

1965 06 26 22 14 36.5 51.40 178.60 

1965 07 02 20 58 40.3 53.10 167.60 

1965 07 06 01 12 47.6 59.90 149.30 

1965 07 08 21 48 

1965 07 13 15 10 

1965 07 15 05 45 03.5 61.80 148.80 

1965 07 27 11 20 27.5 51.20 177 .60E 

1965 07 29 08 29 21.2 50.90 171.40 

1965 08 08 12 49 23.4 51.80 175.20 

1965 09 03 

1965 09 04 14 32 46.7 58.20 152.70 

70 U.S. Geological Survey Bulletin 1840 

Mag Pep 

km 

5.4 28 

4.9 36 

4.2 33 

6.0 23 

7.3 51 

5.1 33 

5.8 5 

5.1 43 

5.5 35 

5.9 53 

5.5 58 

4.0 33 

5.2 43 

6.7 60 

3.9 44 

3.8 64 

5.4 31 

6.3 22 

5.3 53 

6.2 10 

INTENSITY INFORMATION 

6. Obs. Location INT Locality 

km Lat 0 N Lon °W MM 

177 51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

92 52.72 174.11E 3 Shemya 

142 51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

149 52.72 174.11E 3 Shemya 

62.97 155.67 3 McGrath 

51.86 176.66 3 Adak 

130 51.41 179.23E 3 Amchitka 

165 51.86 176.66 3 Adak 

67.00 146.50 3 Venetie 

250 51.41 179.23E 3 Amchitka 

107 64.58 162.33 6 Elim 

63 64.91 161.33 5 Koyuk 

75 64.31 158.83 5 Kaltag 

100 63.86 160.83 5 Unalakleet 

210 66.58 160.16 4 Selawik 

215 64.68 155.58 4 Ruby 

255 64.50 165.41 4 Nome 

263 66.82 162.60 4 Kotzebue 

196 66.08 162.72 3 Deering 

260 66.98 161.32 3 Buckland 

301 65.20 166.38 3 Teller 

331 61.87 158.10 3 Crooked Creek 

338 61.96 162.98 3 Pilot Station 

70 52.72 174.11E 3 Shemya 

325 51.86 176.66 3 Adak 

510 51.41 179.23E 3 Amchitka 

59.55 139.81 3 Yakutat 

76 55.18 162.50 5 Cold Bay 

26 61.21 149.89 4 Anchorage 

130 60.58 151.31 4 Kenai 

144 60.11 149.41 4 Seward 

64.66 147.10 3 Eielson AFB 

44 64.85 147.71 3 Fairbanks 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

144 51.86 176.66 3 Adak 

45 53.26 168.21 6 Umnak 

406 55.18 162.50 5 Cold Bay 

130 59.63 151.55 3 Homer 

60.75 148.80 3 Whittier 

51.86 176.66 3 Adak 

88 61.21 149.89 3 Anchorage 

294 52.72 174.11E 3 Shemya 

381 51.86 176.66 3 Adak 

101 51.86 176.66 3 Adak 

62.85 149.11 3 High Lake Lodge 

51 57.75 152.50 3 Kodiak 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~· Date Time Epicenter ~ag IDep A Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

1799 1965 09 04 14 32 46.7 58.20 152.70 6.2 10 113 58.95 151.38 s NOAA Surveyor (Ship) 

173 59.63 151.55 s Homer 

371 61.21 149.89 s Anchorage 

1800 1965 09 05 12 11 02.1 51.80 176.30 4.2 44 26 51.86 176.66 s Adak 

1801 1965 09 08 03 26 20.8 57.50 152.20 5.6 25 33 57.75 152.50 s Kodiak 

1802 1965 09 09 07 38 26.4 60.10 153.20 3.9 104 106 59.63 151.55 s Homer 

1803 1965 09 23 07 17 17.5 59.80 152.30 3.9 57 46 59.63 151.55 s Homer 

1804 1965 10 01 08 52 04.4 50.10 178.20E 6.3 23 224 51.86 176.66 3 Adak 

1805 1965 10 07 19 51 57.2 51.70 176.00 4.7 63 49 51.86 176.66 3 Adak 

1806 1965 10 10 00 35 59.3 51.80 175.40 5.2 53 87 51.86 176.66 3 Adak 

1807 1965 10 12 06 27 16.8 52.10 174.80 5.1 18 131 51.86 176.66 3 Adak 

1808 1965 10 12 06 38 08.2 51.90 176.40 4.1 126 18 51.86 176.66 3 Adak 

1809 1965 10 15 16 43 61.11 146.28 3 Valdez 

1810 1965 10 15 16 45 61.11 146.28 3 Valdez 

1811 1965 10 16 01 44 05.5 65.20 164.20 4.4 33 97 64.50 165.41 3 Nome 

1812 1965 10 24 03 39 09.4 52.10 176.10 4.9 98 47 51.86 176.66 s Adak 

1813 1965 10 25 00 47 30.0 51.50 178.50 4.0 44 133 51.86 176.66 s Adak 

1814 1965 11 06 06 38 39.3 60.70 147.30 5.2 21 151 61.21 149.89 4 Anchorage 

1815 1965 11 08 12 41 09.8 51.60 177.00 4.3 64 37 51.86 176.66 s Adak 

1816 1965 11 22 14 00 27.2 51.90 176.10 5.6 49 39 51.86 176.66 s Adak 

1817 1965 11 23 02 17 49.7 51.40 179.70 5.6 49 217 51.86 176.66 3 Adak 

1818 1965 11 23 06 16 28.6 51.40 179.60 4.2 45 210 51.86 176.66 s Adak 

1819 1965 11 24 08 22 39 63.20 150.90 5.0 129 80 62.61 150.01 3 Curry 

1820 1965 12 01 22 25 59.50 154.62 s Intricate Bay 

1821 1965 12 12 00 48 02.1 51.50 178.90 5.2 49 160 51.86 176.66 s Adak 

1822 1965 12 22 19 41 23.1 58.40 153.10 6.5 51 82 57.73 152.53 5 Kodiak Naval Station 

50 58.19 152.35 3 Kitoi Bay 

163 59.63 151.55 s Homer 

1823 1965 12 30 02 06 29 54.10 164.30 5.7 13 992 59.63 151.55 s Homer 

1824 1965 12 30 16 33 43.8 58.20 152.40 5.3 ss 50 57.75 152.50 s Kodiak 

1825 1966 01 18 21 28 51.5 61.40 151.90 4.1 80 110 61.21 149.89 3 Anchorage 

1826 1966 01 18 21 46 01.5 61.50 150.70 4.1 69 54 61.21 149.89 3 Anchorage 

1827 1966 01 21 08 13 17.2 59.63 151.55 3 Homer 

1828 1966 01 24 22 10 01.9 51.70 176.30 4.5 54 31 51.86 176.66 3 Adak 

1829 1966 01 28 19 07 15.0 51.90 177.10 5.4 55 31 51.86 176.66 3 Adak 

1830 1966 01 29 16 00 61.21 149.89 3 Anchorage 

1831 1966 02 06 23 28 07.7 60.40 152.30 5.3 91 549 64.85 147.71 4 Fairbanks 

95 59.63 151.55 4 Homer 

159 61.21 149.89 3 Anchorage 

1832 1966 02 16 21 52 24.2 58.20 152.20 3.9 71 53 57.75 152.50 s Kodiak 

1833 1966 02 24 18 54 34.8 51.80 177.30 4.2 65 45 51.86 176.66 3 Adak 

1834 1966 03 03 17 37 03.7 61.40 150.60 4.0 53 44 61.21 149.89 3 Anchorage 

99 60.58 151.31 3 Kenai 

84 61.60 149.08 3 Palmer 

1835 1966 03 08 20 11 51.86 176.66 3 Adak 

1836 1966 03 09 08 11 03.6 51.70 177.10 4.6 55 35 51.86 176.66 3 Adak 

1837 1966 03 13 08 32 37.8 51.86 176.66 3 Adak 

1838 1966 OS 25 21 59 26.3 56.60 135.40 4.7 21 52 57.06 135.50 s Sitka 

Table 1-Earthquakes and Intensity Data 71 
l~q. No. 

1839 

1840 

1841 

1842 

1843 

1844 

1845 

1846 

1847 

1848 

1849 

1850 

1851 

1852 

1853 

1854 

1855 

1856 

1857 

1858 

1859 

1860 

1861 

1862 

1863 

1864 

1 

1 

1 

1 

865 

866 

867 

868 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1966 04 22 23 27 20.5 57.40 152.30 

1966 05 03 12 06 55.8 51.60 176.70 

1966 05 14 14 46 14.6 51.90 177.70 

1966 05 15 14 46 06.5 51.40 178.40 

1966 05 19 07 06 24.4 54.10 164.10 

1966 06 04 10 

1966 06 22 11 38 50.7 61.30 147.70 

1966 06 28 06 25 

1966 07 04 18 33 37.1 51.90 179.80E 

1966 07 07 02 13 58 

1966 07 19 19 20 33.5 51.70 173.30 

1966 07 22 10 17 23.0 51.70 173.50 

1966 08 07 02 13 04.7 50.60 171.20 

1966 08 17 20 58 36.6 52.20 175.00E 

1966 08 24 00 50 47.5 51.90 176.20 

1966 08 26 07 13 06.3 

1966 08 26 10 19 34.8 67.10 161.50 

1966 08 30 20 20 53.9 61.30 14 7.50 

1966 08 30 20 23 18.2 61.50 147.50 

1966 09 01 15 00 

1966 09 01 23 19 08.1 61.70 149.70 

1966 09 08 22 31 50.7 52.80 173.40E 

1966 10 02 07 23 38.1 51.60 174.60 

1966 10 05 02 59 58.5 52.30 173.90 

1966 10 07 20 55 56.4 61.70 150.10 

1966 10 08 07 55 42.8 

1966 10 08 10 03 47.0 61.30 150.50 

1966 10 12 14 23 

1966 10 12 18 35 24.1 

1966 10 20 09 29 59.1 51.40 176.60 

72 U.S. Geological Survey Bulletin 1840 

Mag Dep 

km 

5.9 26 

4.7 33 

5.9 66 

5.7 30 

5.1 9 

5.2 28 

6.0 15 

5.4 47 

5.4 55 

6.2 33 

5.5 33 

4.2 59 

5.2 14 

5.8 35 

5.5 33 

5.1 63 

5.0 52 

5.1 58 

4.8 78 

5.6 57 

3.7 33 

5.1 54 

INTENSITY INFORMATION 

6. Obs. Location INT Locality 

km Lat 0 N Lon °W MM 

41 57.75 152.50 3 Kodiak 

29 51.86 176.66 3 Adak 

72 51.86 176.66 3 Adak 

131 51.86 176.66 3 Adak 

159 55.18 162.50 4 Cold Bay 

62.85 149.11 3 High Lake Lodge 

118 61.21 149.89 3 Anchorage 

59.63 151.55 3 Homer 

216 51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

233 51.86 176.66 3 Adak 

219 51.86 176.66 3 Adak 

406 51.86 176.66 3 Adak 

119 52.76 173.50E 3 Near Islands 

32 51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

57 66.82 162.60 5 Kotzebue 

128 61.12 149.86 5 Turnagain 

129 61.21 149.89 5 Anchorage 

69 61.11 146.28 3 Valdez 

91 61.60 149.08 3 Palmer 

126 60.55 145.75 3 Cordova 

137 62.11 145.55 3 Glennallen 

217 63.03 145.58 3 Paxson 

221 60.58 151.31 3 Kenai 

132 61.21 149.89 5 Anchorage 

78 61.11 146.28 3 Valdez 

85 61.60 149.08 3 Palmer 

123 62.11 145.55 3 Glennallen 

142 60.55 145.75 3 Cordova 

197 63.03 145.58 3 Paxson 

230 60.58 151.31 3 Kenai 

60.95 149.30 3 Girdwood 

86 60.95 149.30 3 Girdwood 

56 61.21 149.89 3 Anchorage 

246 51.86 176.66 3 Adak 

145 51.86 176.66 3 Adak 

195 51.86 176.66 3 Adak 

56 61.21 149.89 4 Anchorage 

141 60.58 151.31 3 Kenai 

181 60.11 149.41 3 Seward 

214 61.11 146.28 3 Valdez 

61.21 149.89 3 Anchorage 

34 61.21 149.89 3 Anchorage 

64.85 147.71 4 Fairbanks 

64.86 147.80 3 College 

64.66 147.10 3 Eielson AFB 

64.85 147.55 3 Fort Wainwright 

51.86 176.66 3 Adak 

51 51.86 176.66 3 Adak 
~Eq. No. 

1869 

1870 

1871 

1872 

1873 

1874 

1875 

1876 

1877 

1878 

1879 

1880 

1881 

1882 

1883 

1884 

1885 

1886 

1887 

1888 

1889 

1890 

1891 

1892 

1893 

1894 

1895 

1896 

1 

1 

1 

1 

897 

898 

899 

900 

901 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1966 11 14 00 12 

1966 11 1'1 13 54 01.7 51.40 176.30 

1966 11 17 14 43 11.9 51.30 176.30 

1966 11 20 09 29 59.3 51.40 176.50 

1966 11 21 02 22 35.9 51.80 1 79.90E 

1966 11 27 05 20 

1966 12 11 20 01 03.8 52.90 176.00 

1966 12 14 03 44 02.2 52.80 1 '1'1.60 

1966 12 16 21 59 46.2 61.40 149.50 

1966 12 20 00 26 27.9 66. 'TO 148.60 

1966 12 20 00 57 53.2 66. 'TO 148.80 

1966 12 24 22 28 59.7 59.80 153.40 

1966 12 25 23 03 22.3 51.80 1 76.10E 

1966 12 26 03 43 1 '1 64.60 14'1.60 

196'1 01 02 1'1 30 

196'1 01 0'1 04 55 29.2 51.86 175.15 

1967 01 0'1 21 06 27 51.91 176.63 

1967 01 18 10 42 54.1 60.48 152.44 

196'1 01 28 13 52 58.2 52.38 169.52 

1967 02 06 03 26 35.5 60.15 152. '1'1 

1967 02 06 14 48 39.6 64.72 146.86 

196'1 02 10 20 55 

1967 02 1 '1 08 00 

1967 02 24 00 23 52.3 51.'19 1'16.94 

196'1 02 28 04 00 13.1 64.92 148.71 

1967 03 20 08 23 00.4 60.44 149.58 

1967 03 26 04 24 12.4 64.14 146.84 

1967 03 31 04 18 31.3 63.12 148.50 

196'1 04 03 1'1 33 12.5 61.8'1 148.55 

1967 04 04 20 43 04.0 60.23 148.51 

196'1 04 12 00 54 40.0 56.12 136.12 

1967 04 1 '1 00 00 42.7 

196'1 04 21 02 22 32.1 64.65 14'1.1'1 

Ma.g Dep 

km 

4.6 61 

4.8 52 

5.3 54 

4.6 49 

5.1 215 

5.2 252 

4.1 53 

4.8 33 

4.9 33 

5.0 112 

4.8 39 

3.8 39 

4.5 48 

4.3 35 

4.5 96 

5.9 43 

4.9 108 

4.5 32 

4.2 119 

29 

4.2 60 

4.4 18 

4.5 82 

3.8 32 

4.1 49 

4.6 15 

4.0 35 

INTENSITY INFORMATION 

t:l Obs. Location INT Locality 

km Lat 0 N Lon ow MM 

67.00 146.50 3 Venetie 

57 51.86 176.66 3 Adak 

67 51.86 176.66 3 Adak 

52 51.86 176.66 3 Adak 

223 51.86 176.66 3 Adak 

64.85 147.71 4 Fairbanks 

124 51.86 176.66 3 Adak 

123 51.86 176.66 3 Adak 

30 61.21 149.89 3 Anchorage 

137 66.90 151.69 4 Bettles 

129 66.90 151.69 4 Bettles 

106 59.63 151.55 3 Homer 

232 52.94 173.25E 3 Attu 

81 64.33 149.16 3 Clear 

59.63 151.55 3 Homer 

104 51.86 176.66 3 Adak 

6 51.86 176.66 3 Adak 

107 59.63 151.55 3 Homer 

132 53.26 168.21 3 Umnak 

197 61.21 149.89 3 Anchorage 

90 59.63 151.55 3 Homer 

94 60.58 151.31 3 Kenai 

268 57.75 152.50 3 Kodiak 

13 64.66 147.10 5 Eielson AFB 

43 64.85 147.71 5 Fairbanks 

44 64.98 147.55 5 Gilmore Creek 

75 64.95 148.35 5 Murphy Dome 

97 63.99 145.75 5 Fort Greely 

119 64.58 149.33 5 Nenana 

61.18 149.99 4 Anchorage Airport 

61.21 149.89 4 Anchorage 

21 51.86 176.66 3 Adak 

48 64.85 147.71 3 Fairbanks 

91 65.00 150.63 3 Manley Hot Springs 

17 64.95 148.35 3 Murphy Dome 

67 64.74 147.35 3 North Pole 

87 61.21 149.89 3 Anchorage 

55 64.03 145.73 4 Delta Junction 

37 63.38 148.95 3 Cantwell 

43 62.85 149.11 3 High Lake Lodge 

41 61.60 149.08 2 Palmer 

183 59.63 151.55 3 Homer 

186 59.68 151.65 3 Homer (5 mi NW. of) 

111 57.06 135.50 3 Sitka 

52.72 174.11E 3 Shemya 

37 64.86 147.77 3 Aurora Lodge 

4 64.66 147.10 3 Eielson AFB 

34 64.85 147.72 3 Lemeta 

34 64.85 147.71 4 Fairbanks 

Table 1-Earthquakes and Intensity Data 73 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~~~- Date Time Epicenter Mag Dep 1:1 Obs. Locat.ion INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat. 0 N Lon °W km km Lat 0 N Lon °W MM 

1901 1967 04 21 02 22 32.1 64.65 147.17 4.0 35 406 61.05 146.00 3 Richardson Hwy (mi 16.0) 

406 61.05 145.94 3 Richardson Hwy (mi 17.0) 

1902 1967 04 29 03 55 20.8 51.44 178.32 5.9 48 124 51.86 176.66 3 Adak 

1903 1967 04 29 12 25 32.9 51.41 178.26 5.3 51 122 51.86 176.66 2 Adak 

1904 1967 05 01 04 19 62.85 149.11 3 High Lake Lodge 

1905 1967 05 05 17 06 15.3 63.71 148.45 5.0 103 138 64.03 145.73 4 Delta Junction 

77 64.33 149.16 3 Clear 

106 64.58 149.33 3 Nenana 

129 64.80 147.53 3 Badger Road 

132 64.85 147.71 3 Fairbanks 

136 63.99 145.75 3 Fort Greely 

191 62.16 150.07 3 Sunshine 

1906 1967 05 08 06 40 29.3 62.15 149.84 3.8 65 73 61.60 149.08 3 Palmer 

1907 1967 05 19 16 43 52 51.70 176.92 4.7 57 25 51.86 176.66 3 Adak 

1908 1967 06 01 03 36 19 53.70 165.60 5.7 60 64 53.88 166.53 4 Dutch Harbor 

180 53.26 168.21 3 Umnak 

260 55.18 162.50 3 Cold Bay 

774 51.86 176.66 3 Adak 

1909 1967 06 08 19 08 40.4 51.86 176.66 3 Adak 

1910 1967 06 21 01 00 64.00 144.00 39 63.65 144.11 6 Dot Lake 

38 63.66 144.06 3 Dot Lake Lodge 

1911 1967 06 21 18 00 66.37 147.50 4 Beaver 

1912 1967 06 21 18 13 02.9 64.80 147.40 5.6 17 12 64.73 147.22 7 Richardson Hwy (mi 16.5) 

13 64.72 147.21 7 Richardson Hwy (mi 17.0) 

9 64.85 147.55 7 Fort Wainwright 

16 64.85 147.71 7 Fairbanks 

36 64.53 146.99 7 Richardson Hwy (mi 35.0) 

20 64.86 147.80 6 College 

21 64.98 147.55 6 Gilmore Creek 

95 64.58 149.33 6 Nenana 

103 64.16 145.85 6 Big Delta 

118 64.03 145.73 6 Delta Junction 

192 63.50 150.00 6 Healy Canyon 

36 64.83 148.15 5 Ester 

99 64.33 149.16 5 Clear 

140 63.73 148.91 5 McKinley Park 

175 63.38 148.95 5 Cantwell 

85 64.89 149.18 4 Minto 

133 63.83 149.01 4 Healy Fork 

145 65.57 144.90 4 Central 

175 66.37 147.50 4 Beaver 

228 65.18 152.16 4 Tanana 

272 63.31 142.98 4 Tok 

120 63.99 145.75 3 Fort Greely 

131 65.53 145.20 3 Miller House 

259 63.90 152.36 3 Lake Minchumina 

314 62.11 145.55 3 Glennallen 

367 61.60 149.08 3 Palmer 

420 61.21 149.89 3 Anchorage 

1913 1967 06 21 22 15 64.01 144.80 4 Healy River 

1914 1967 06 21 23 31 46.6 64.73 14 7.42 3.9 14 19 64.85 147.71 3 Fairbanks 

23 64.86 147.80 3 College Observatory 

1915 1967 06 22 00 27 54.3 64.90 147.10 4.1 13 33 64.86 147.80 3 College Observatory 

74 U.S. Geological Survey Bulletin 1840 
BARTHQUAKE PARAMETERS INTENSITY INFORMATION 

l~q. Dat.e Time Epicent.er Mag Dep ~ Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Ln.t 0 N Lon °W km km Lat 0 N Lon °W MM 

1916 1967 06 22 14 11 30.8 64.80 14 7.50 3.8 13 16 64.86 147.80 3 College Observat.ory 

11 64.85 147.71 3 Fairbanks 

1917 1967 06 22 15 36 38.9 51.70 176.80 5.3 54 20 51.86 176.66 3 Adak 

1918 1967 06 22 18 57 36.4 64.81 147.40 4.1 14 15 64.85 147.71 2 Fairbanks 

100 64.33 149.16 2 Clear 

1919 1967 06 22 20 19 3.8 64.85 147.71 3 Fairbanks 

1920 1967 06 22 21 16 56.2 64.80 147.30 4.1 10 25 64.86 147.80 3 College 

20 64.85 147.71 2 Fairbanks 

1921 1967 06 22 22 44 64.86 147.80 3 College Observatory 

1922 1967 06 22 23 08 3.6 64.86 147.80 3 College Observatory 

1923 1967 06 23 03 54 64.86 147.80 3 College Observatory 

1924 1967 06 23 05 18 64.86 147.80 3 College Observatory 

1925 1967 06 23 06 06 23.2 64.70 147.40 4.0 17 22 64.85 147.71 2 Fairbanks 

1926 1967 06 23 06 34 64.86 147.80 3 College Observatory 

1927 1967 06 23 06 44 64.86 147.80 3 College Observatory 

1928 1967 06 23 11 54 33.5 64.81 147.45 4.6 9 13 64.85 147.71 6 Fairbanks 

1929 1967 06 23 11 56 3.9 64.85 147.71 3 Fairbanks 

1930 1967 06 23 11 57 5.0 64.85 147.71 3 Fairbanks 

1931 1967 06 23 11 58 64.85 147.71 3 Fairbanks 

1932 1967 06 23 12 01 3.5 64.85 147.71 3 Fairbanks 

1933 1967 06 23 12 04 64.85 147.71 3 Fairbanks 

1934 1967 06 23 15 27 64.85 147.71 3 Fairbanks 

1935 1967 06 23 20 10 40.9 64.83 147.31 3.5 3 19 64.85 147.71 3 Fairbanks 

1936 1967 06 24 11 02 56.9 64.78 14 7.50 3.9 12 13 64.85 147.71 3 Fairbanks 

1937 1967 06 25 02 53 3.6 64.86 147.80 3 College Observatory 

1938 1967 06 25 15 18 39.7 64.76 14 7.38 3.3 16 19 64.85 147.71 3 Fairbanks 

1939 1967 06 25 17 35 64.85 147.71 3 Fairbanks 

1940 1967 06 25 22 38 64.85 147.71 3 Fairbanks 

1941 1967 06 26 14 38 4.1 64.85 147.71 3 Fairbanks 

1942 1967 06 27 11 02 64.86 147.80 3 College Observatory 

1943 1967 06 28 06 57 64.86 147.80 3 College Observatory 

1944 1967 06 28 07 10 64.78 147.10 3 Eielson AFB {8 miN. of) 

1945 1967 06 28 20 28 11.3 64.80 147.50 3.8 11 64.85 147.71 3 Fairbanks 

1946 1967 06 29 04 53 25 51.70 177.00 4.6 58 29 51.86 176.66 3 Adak 

1947 1967 07 01 23 10 07.2 54.40 158.00 6.2 33 184 55.91 159.18 4 Perryville 

192 55.33 160.51 3 Sand Point 

302 55.18 162.50 3 Cold Bay 

1948 1967 07 06 05 06 13.4 62.40 147.40 5.1 59 62 62.06 146.45 3 Tazlina 

101 62.11 145.55 3 Glennallen 

106 62.26 145.38 3 Gulkan~ 

187 61.21 149.89 3 Anchorage 

232 64.33 149.16 3 Clear 

1949 1967 07 07 20 37 64.85 147.71 3 Fairbanks 

1950 1967 07 08 07 00 57.2 62.30 156.30 4.0 33 81 62.97 155.67 4 McGrath 

1951 1967 07 08 09 18 16.7 62.30 156.30 4.0 33 81 62.97 155.67 4 McGrath 

1952 1967 07 12 01 47 30.6 51.80 175.00 4.5 17 115 51.86 176.66 3 Adak 

1953 1967 07 16 09 44 51.86 176.66 3 Adak 

1954 1967 07 16 14 39 51.86 176.66 3 Adak 

Table 1-Earthquakes and Intensity Data 75 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

l~q. Date Time Epicenter Mag Dep 6 Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km La.t 0 N Lon °W MM 

1955 1967 07 17 10 19 64.85 147.71 3 Fairbanks 

1956 1967 07 19 18 35 59.68 151.65 3 Homer (5 mi NW. of) 

1957 1967 07 24 12 30 65.00 150.63 3 Manley Hot Springs 

1958 1967 07 24 16 18 45.1 65.70 152.20 20 107 65.00 150.63 3 Manley Hot Springs 

1959 1967 07 25 14 37 51.86 176.66 3 Adak 

1960 1967 07 26 06 20 51.86 176.66 3 Adak 

1961 1967 07 27 16 35 31.3 52.00 176.20 4.4 63 35 51.86 176.66 3 Adak 

1962 1967 08 04 10 59 26.9 51.86 176.66 3 Adak 

1963 1967 08 05 23 46 22.5 64.66 147.10 3 Eielson AFB 

64.85 147.71 3 Fairbanks 

1964 1967 08 08 08 58 32.3 64.85 147.71 3 Fairbanks 

1965 1967 08 12 00 49 37 64.85 147.71 3 Fairbanks 

1966 1967 08 12 10 49 19.2 64.85 147.71 3 Fairbanks 

1967 1967 08 12 18 41 30.5 51.86 176.66 3 Adak 

1968 1967 08 14 01 46 47.5 64.85 147.71 3 Fairbanks 

1969 1967 08 17 22 42 09.3 59.40 151.40 5.0 55 276 61.60 149.08 3 Palmer 

1970 1967 08 18 05 50 29 61.50 151.00 4.5 19 103 61.60 149.08 3 Palmer 

1971 1967 08 20 19 24 00.9 64.86 147.80 3 College 

64.85 147.71 3 Fairbanks 

1972 1967 08 23 07 48 40.5 64.86 147.80 3 College 

64.85 147.71 3 Fairbanks 

1973 1967 08 23 10 29 33.7 64.86 147.80 3 College 

64.85 147.71 3 Fairbanks 

1974 1967 08 26 00 05 32.5 64.85 147.71 3 Fairbanks 

1975 1967 08 28 09 25 30.6 64.85 147.71 3 Fairbanks 

1976 1967 08 30 22 12 17.5 64.86 147.80 3 College 

1977 1967 09 03 11 30 51.7 60.50 151.60 4.7 79 122 61.21 149.89 3 Anchorage 

1978 1967 09 06 22 29 18 64.33 149.16 4 Clear 

1979 1967 09 08 51.86 176.66 3 Adak 

1980 1967 09 09 05 37 47.2 64.86 147.80 3 College 

1981 1967 09 11 08 00 53.4 64.85 147.71 3 Fairbanks 

1982 1967 09 16 08 31 58.4 52.00 176.40 5.4 65 24 51.86 176.66 3 Adak 

1983 1967 09 19 05 54 49.1 64.86 147.80 3 College 

1984 1967 09 21 03 01 19.7 64.86 147.80 3 College 

1985 1967 09 22 07 10 04.4 64.86 147.80 3 College 

1986 1967 09 25 19 48 59.63 151.55 3 Homer 

1987 1967 09 26 01 10 58.3 64.86 147.80 3 College 

1988 1967 09 28 15 14 55.7 59.50 147.10 5.6 28 44 59.43 146.33 3 Middleton Island 

139 60.55 145.75 3 Cordova 

1989 1967 10 02 09 30 02.2 64.86 147.80 3 College 

1990 1967 10 10 02 52 56.3 52.30 176.10 5.0 78 62 51.86 176.66 3 Adak 

1991 1967 10 10 12 14 11.8 64.80 147.20 10 25 64.85 147.71 3 Fairbanks 

1992 1967 10 11 07 56 36.1 63.00 151.10 4.6 115 188 61.60 149.08 3 Palmer 

1993 1967 10 25 20 07 32.6 60.80 150.40 33 53 61.21 149.89 3 Anchorage 

1994 1967 10 28 10 13 09.1 64.80 14 7. 70 33 6 64.85 147.71 3 Fairbanks 

1995 1967 10 29 19 31 59.68 151.65 3 Homer (5 mi NW. of) 

1996 1967 10 so 23 03 12.5 64.85 147.71 3 Fairbanks 

76 U.S. Geological Survey Bulletin 1840 
~~- No. 

1997 

1998 

1999 

2000 

2001 

2002 

2003 

2004 

2005 

2006 

2007 

2008 

2009 

2010 

2011 

2012 

2013 

2014 

2015 

2016 

2017 

2018 

2019 

2020 

2021 

2022 

2023 

2024 

2025 

2026 

2027 

2028 

2029 

2030 

2031 

2032 

2033 

2034 

2 

2 

2 

2 

2 

2 

2 

035 

036 

037 

038 

039 

040 

041 

EARTHQUAKE PARAMETERS 

Date Time Epicenter Mag 

Yr Mo Dy Hr Mn Sec Lat. 0 N Lon ow 

1967 11 01 03 10 43 

1967 11 10 18 29 57.3 62.30 151.40 4.9 

1967 11 16 18 35 58 

1967 11 18 09 20 53.5 

1967 11 21 21 04 07.3 

1967 11 22 08 59 

1967 11 24 10 13 36.8 

1967 11 25 08 59 06.9 52.00 175.20 3.9 

1967 11 27 04 27 02.4 60.30 140.80 4.6 

1967 11 29 09 20 01.7 

1967 12 04 06 53 17.5 

1967 12 12 04 48 34.5 65.00 147.30 

1967 12 13 09 36 24.2 65.10 147.30 

1967 12 15 02 13 36.3 

1967 12 19 04 48 38.8 

1967 12 19 14 40 41.3 51.70 176.90 4.8 

1968 01 09 13 27 08.9 64.90 146.60 

1968 01 14 17 43 10.0 52.70 171.20 5.5 

1968 02 18 14 03 24.2 51.70 177.70 4.2 

1968 02 20 02 45 49.2 60.00 142.00 3.9 

1968 02 20 05 06 11.9 58.40 151.70 4.9 

1968 02 21 06 18 21.6 52.30 175.30 5.2 

1968 02 21 06 21 03.6 52.30 175.30 5.3 

1968 02 21 19 08 39.3 51.40 176.10 4.7 

1968 02 21 19 30 04.9 51.60 176.00 4.7 

1968 02 21 19 32 32.2 51.70 175.90 4.8 

1968 02 21 21 07 56.9 51.40 176.00 5.2 

1968 02 21 21 15 08.0 51.40 175.80 4.4 

1968 02 21 21 28 17 51.70 176.00 4.2 

1968 02 22 00 54 14.4 

1968 02 22 17 46 57.4 51.40 176.30 5.1 

1968 02 23 00 10 39.5 51.50 176.30 4.6 

1968 02 23 01 40 12.4 51.60 177.20 4.5 

1968 02 23 08 12 55.7 51.60 175.90 4.5 

1968 02 23 09 32 26.1 51.50 176.30 4.6 

1968 02 23 20 29 38.4 51.90 179.10 5.2 

1968 02 23 21 22 06.9 

1968 02 25 18 08 19.9 51.40 176.00 5.3 

1968 02 27 23 49 07.2 

1968 02 28 04 04 

1968 02 28 08 36 40.8 

1968 03 03 14 23 04.1 64.70 14 7.80 

1968 03 05 21 18 07.7 64.80 14 7.30 

1968 03 10 03 49 25 52.10 177.30 5.4 

1968 03 13 10 55 27.9 51.70 176.80 4.8 

INTENSITY INFORMATION 

Dep tl. Obs. Location INT Locality 

km km Lat 0 N Lon °W MM 

64.85 147.71 3 Fairbanks 

90 145 61.21 149.89 3 Anchorage 

61.21 149.89 3 Anchorage 

64.86 147.80 3 College 

64.85 147.71 3 Fairbanks 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

64.85 147.71 3 Fairbanks 

33 102 51.86 176.66 3 Adak 

16 93 60.07 142.41 3 Cape Yakataga 

64.85 147.71 4 Fairbanks 

51.86 176.66 3 Adak 

33 26 64.85 147.71 3 Fairbanks 

33 34 64.85 147.71 3 Fairbanks 

64.85 147.71 3 Fairbanks 

64.85 147.71 3 Fairbanks 

59 24 51.86 176.66 3 Adak 

33 36 64.66 147.10 3 Eielson AFB 

34 160 52.94 168.86 4 Nikolski 

72 74 51.86 176.66 3 Adak 

33 24 60.07 142.41 3 Cape Yakataga 

34 329 61.21 149.89 3 Anchorage 

108 105 51.86 176.66 3 Adak 

107 105 51.86 176.66 3 Adak 

49 64 51.86 176.66 3 Adak 

57 54 51.86 176.66 3 Adak 

54 55 51.86 176.66 3 Adak 

47 69 51.86 176.66 3 Adak 

52 79 51.86 176.66 3 Adak 

49 49 51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

49 57 51.86 176.66 3 Adak 

65 47 51.86 176.66 3 Adak 

54 47 51.86 176.66 3 Adak 

55 60 51.86 176.66 3 Adak 

49 47 51.86 176.66 3 Adak 

89 168 51.86 176.66 3 Adak 

64.86 147.80 3 College 

50 69 51.86 176.66 3 Adak 

64.86 147.80 3 College 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

16 17 64.85 147.71 3 Fairbanks 

16 20 64.85 147.71 3 Fairbanks 

25 64.86 147.80 3 College 

7 51 51.86 176.66 4 Adak 

60 20 51.86 176.66 3 Adak 

Table 1-Earthquakes and Intensity Data 77 
IEq. 

No. 

2042 

2043 

2044 

2045 

2046 

2047 

2048 

2049 

2050 

2051 

2052 

2053 

2054 

2055 

2056 

2057 

2058 

2059 

2060 

2061 

2062 

2063 

2064 

2065 

2066 

2067 

2068 

2069 

2070 

2071 

2072 

2073 

2074 

2075 

2076 

2 077 

2078 

2 

2 

2 

2 

2 

2 

2 

079 

080 

081 

082 

083 

084 

085 

EARTHQUAKE PARAMETERS 

Da.te Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1968 03 15 02 13 35.6 64.70 147.30 

1968 03 17 10 10 47.7 

1968 03 22 17 01 23.3 

1968 04 01 14 22 41 64.80 147.20 

1968 04 08 10 59 25.9 

1968 04 17 19 52 

1968 04 23 20 29 14.5 58.70 150.00 

1968 04 24 15 52 38.9 60.90 147.50 

1968 05 08 19 06 47 61.90 148.70 

1968 05 09 07 22 47 61.40 149.80 

1968 05 15 23 13 39.3 

1968 05 16 04 07 14.5 

1968 05 18 06 50 27.4 61.20 147.60 

1968 05 28 08 11 30.2 

1968 05 29 15 25 39 62.30 149.10 

1968 06 13 13 54 09 

1968 06 15 13 38 06.5 61.00 146.90 

1968 06 23 05 40 32.2 

1968 07 02 21 27 05 65.00 147.70 

1968 07 05 19 33 10.3 60.90 147.00 

1968 07 13 08 47 05.7 

1968 07 13 11 49 31.6 

1968 07 16 09 46 31.2 64.90 147.20 

1968 07 26 16 08 20.9 

1968 08 08 15 48 53 

1968 08 11 12 37 28.1 52.10 179.90 

1968 08 14 12 10 03.5 60.20 153.00 

1968 08 18 22 07 24 65.90 155.20 

1968 08 31 23 39 26.8 64.70 147.40 

1968 09 01 02 19 41.2 

1968 09 01 02 45 53.2 64.80 147.40 

1968 09 01 04 41 47.7 

1968 09 01 05 08 44.2 64.79 147.35 

1968 09 02 01 04 33.3 

1968 09 02 01 29 03.4 64.70 147.50 

1968 09 08 16 22 58.6 64.80 147.60 

1968 09 17 07 00 08.7 64.70 147.60 

1968 09 17 21 59 40.6 51.90 176.20 

1968 09 18 01 18 34.2 64.80 147.60 

1968 09 20 19 08 38.7 

1968 09 21 18 30 46.3 

1968 09 22 06 34 16.7 

1968 09 22 11 33 18.7 51.30 177.60 

1968 09 24 06 44 16.9 61.44 149.87 

78 U.S. Geological Survey Bulletin 1840 

Ma.g Dep 

km 

8 

6.3 23 

3.9 56 

5 

29 

4.3 33 

4.0 51 

4.9 19 

33 

4.1 28 

12 

5.5 159 

4.6 103 

3.9 34 

3.8 3 

10 

10 

4.0 3 

4.5 12 

3.7 16 

4.3 74 

4.1 12 

4.2 37 

3.7 50 

INTENSITY INFORMATION 

fl. Obs. Location INT Locality 

km Lat 0 N Lon °W MM 

26 64.85 147.71 3 Fairbanks 

30 64.86 147.80 3 ColJege 

64.86 147.80 3 College 

64.85 147.71 3 Fairbanks 

25 64.85 147.71 3 Fairbanks 

64.85 147.71 3 Fairbanks 

51.86 176.66 3 Adak 

181 57.75 152.50 3 Kodiak 

115 61.60 149.08 3 Palmer 

39 61.60 149.08 3 Palmer 

44 61.60 149.08 3 Palmer 

64.85 147.71 3 Fairbanks 

61.60 149.08 3 Palmer 

91 61.60 149.08 3 Palmer 

64.85 147.71 3 Fairbanks 

78 61.60 149.08 3 Palmer 

64.85 147.71 3 Fairbanks 

36 61.11 146.28 3 Valdez 

107 60.75 148.80 3 Whittier 

163 61.21 149.89 3 Anchorage 

61.11 146.28 3 Valdez 

17 64.85 147.71 3 Fairbanks 

45 61.11 146.28 3 Valdez 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

25 64.85 147.71 3 Fairbanks 

64.85 147.71 3 Fairbanks 

64.85 147.71 3 Fairbanks 

224 51.86 176.66 3 Adak 

204 61.21 149.89 3 Anchorage 

42 66.22 155.67 4 Hogatza 

22 64.85 147.71 3 Fairbanks 

64.85 147.71 3 Fairbanks 

16 64.85 147.71 4 Fairbanks 

64.85 147.71 3 Fairbanks 

18 64.85 147.71 3 Fairbanks 

64.85 147.71 3 Fairbanks 

19 64.85 147.71 3 Fairbanks 

8 64.85 147.71 3 Fairbanks 

18 64.85 147.71 3 Fairbanks 

32 51.86 176.66 3 Adak 

8 64.85 147.71 3 Fairbanks 

64.85 147.71 3 Fairbanks 

64.85 147.71 3 Fairbanks 

64.85 147.71 3 Fairbanks 

90 51.86 176.66 1 Adak 

46 61.60 149.08 4 Palmer 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~ Date Time Epicent.er Mag Dep !::.. Obg. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon ow km km Lat 0 N Lon ow MM 

2086 1968 09 24 16 28 14.2 61.60 149.08 3 Palmer 

2087 1968 09 28 13 51 55.9 64.80 147.40 3.5 12 16 64.85 147.71 3 Fairbanks 

2088 1968 09 29 02 02 50.2 64.85 147.71 3 Fairbanks 

2089 1968 10 03 11 08 38.9 51.60 17 4.10 5.0 46 179 51.86 176.66 3 Adak 

2090 1968 10 07 18 54 53.6 61.40 150.30 4.2 55 69 61.60 149.08 4 Palmer 

30 61.21 149.89 3 Anchorage 

104 62.33 150.11 3 Talkeetna 

2091 1968 10 24 13 11 58.8 64.70 147.40 14 22 64.85 147.71 3 Fairbanks 

2092 1968 10 26 17 03 52.3 64.80 14 7.50 10 11 64.85 147.71 3 Fairbanks 

2093 1968 10 29 22 16 15.6 65.40 150.10 6.0 7 7 65.46 150.10 8 Hunter Creek 

13 65.48 150.30 8 Rampart 

34 65.10 150.20 6 Baker Creek 

51 65.00 150.63 6 Manley Hot Springs 

71 64.89 149.18 6 Minto 

73 65.52 148.54 6 Livengood 

98 64.58 149.33 6 Nenana 

99 65.18 152.16 6 Tanana 

119 65.10 147.65 5 Chatanika 

128 64.85 147.71 5 Fairbanks 

163 64.66 147.10 5 Eielson AFB 

206 66.03 154.33 5 Hughes 

270 66.22 155.67 5 Hogatza 

316 66.63 143.82 5 Chalkyitsik 

183 63.83 149.01 4 Healy Fork 

199 63.90 152.36 4 Lake Minchumina 

224 67.41 150.10 4 Wiseman 

232 63.38 148.95 4 Cantwell 

254 66.57 145.30 4 Fort Yukon 

258 64.03 145.73 4 Delta Junction 

333 64.71 157.00 4 Galena 

348 66.91 156.87 4 Kobuk 

383 62.97 155.67 4 McGrath 

415 63.31 142.98 4 Tok 

474 66.58 160.16 4 Selawik 

316 68.15 151.79 3 Anaktuvuk Pass 

467 61.21 149.89 3 Anchorage 

2094 1968 10 29 23 25 36.1 65.55 150.26 4.2 33 64 65.00 150.63 3 Manley Hot Springs 

142 64.85 147.71 3 Fairbanks 

2095 1968 10 29 23 43 32.9 65.64 150.00 3.9 16 77 65.00 150.63 3 Manley Hot Springs 

138 64.85 147.71 3 Fairbanks 

2096 1968 10 30 00 25 11.7 65.58 150.13 4.0 65 139 64.85 147.71 3 Fairbanks 

2097 1968 10 30 06 15 33.6 65.55 150.11 4.0 33 137 64.85 147.71 3 Fairbanks 

2098 1968 10 30 14 08 40.6 65.40 150.00 3.9 33 124 64.85 147.71 3 Fairbanks 

2099 1968 10 31 00 25 45.1 65.42 150.09 4.5 16 73 65.52 148.54 4 Livengood 

53 65.00 150.63 3 Manley Hot Springs 

128 64.85 147.71 3 Fairbanks 

2100 1968 10 31 08 00 16.2 64.85 147.71 3 Fairbanks 

2101 1968 10 31 19 23 54.3 65.50 150.00 4.0 9 63 65.00 150.63 3 Manley Hot Springs 

2102 1968 11 02 19 41 46.2 64.90 149.40 4.4 13 59 65.00 150.63 3 Manley Hot Springs 

80 64.85 147.71 3 Fairbanks 

80 65.52 148.54 3 Livengood 

2103 1968 11 03 07 37 40.2 65.60 149.90 4.4 14 132 64.85 147.71 3 Fairbanks 

Table 1-Earthquakes and Intensity Data 79 
IEq. 

No. 

2104 

2105 

2106 

2107 

2108 

2109 

2110 

2111 

2112 

2113 

2114 

2115 

2116 

2117 

2118 

2119 

2120 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

121 

122 

123 

124 

125 

126 

127 

128 

129 

130 

131 

132 

EARTHQUAKE PARAMETERS 

Dat.e Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon ow 

1968 11 03 07 57 41 65.64 150.06 

1968 11 03 08 08 11.7 65.62 149.89 

1968 11 03 23 30 

1968 11 07 00 48 33.6 54.30 164.60 

1968 11 11 03 49 30.9 61.60 150.10 

1968 11 11 08 53 52 57.30 155.30 

1968 11 13 19 30 09.9 

1968 12 07 22 54 31.5 61.80 149.10 

1968 12 09 20 04 49.7 51.80 176.80 

1968 12 13 12 21 15.8 62.00 147.90 

1968 12 17 12 02 15 60.20 152.80 

1968 12 19 21 48 50.5 

1968 12 26 19 03 39.1 51.50 177.80 

1968 12 28 04 15 55 63.00 148.20 

1968 12 29 02 45 10.9 61.70 152.20 

1968 12 30 07 03 11.7 57.60 151.40 

1969 01 03 11 38 03.4 61.00 151.00 

1969 01 03 13 28 12.8 51.20 179.40 

1969 01 05 21 21 05 64.80 14 7.40 

1969 02 05 23 07 15.2 64.81 14 7.24 

1969 02 06 09 33 46.5 51.60 176.20 

1969 02 15 08 34 55.6 

1969 03 04 02 24 56.2 59.97 152.75 

1969 03 09 02 46 09.2 64.80 14 7. 70 

1969 03 14 18 28 12.9 65.40 150.10 

1969 03 15 13 35 35.3 51.20 179.10 

1969 03 21 09 46 28.3 59.90 152.70 

1969 03 31 23 00 08 51.90 178.00 

1969 04 01 21 33 10 55.80 161.30 

80 U.S. Geological Survey Bulletin 1840 

Mag Dep 

km 

3.9 33 

33 

5.1 37 

33 

5.3 59 

33 

4.2 62 

3.8 44 

5.9 86 

4.2 49 

4.6 80 

4.5 77 

5.4 34 

33 

5.8 29 

28 

8 

5.0 58 

121 

30 

4.4 65 

5.6 46 

4.5 105 

4.5 84 

4.6 58 

INTENSITY INFORMATION 

~ Obs. Location INT Locality 

km Lat 0 N Lon °W MM 

141 64.85 147.71 3 Fairbanks 

63 65.52 148.54 3 Livengood 

133 64.85 147.71 3 Fairbanks 

65.00 150.63 3 Manley Hot Springs 

35 54.56 164.90 3 Cape Sarichef 

151 53.98 166.85 3 Driftwood Bay 

54 61.60 149.08 3 Palmer 

80 56.94 154.16 5 Akhiok 

51.86 176.66 3 Adak 

22 61.60 149.08 2 Palmer 

12 51.86 176.66 2 Adak 

76 61.60 149.08 3 Palmer 

61 60.06 151.73 6 Ninilchik 

83 60.35 151.33 6 Cohoe 

92 60.58 151.31 6 Kenai 

94 59.63 151.55 5 Homer 

119 60.54 150.76 5 Sterling 

167 60.49 149.83 5 Cooper Landing 

188 60.11 149.41 5 Seward 

195 61.21 149.89 5 Anchorage 

225 61.42 149.50 5 Chugiak 

255 61.60 149.08 5 Palmer 

273 57.75 152.50 5 Kodiak 

278 62.33 150.11 5 Talkeetna 

343 61.78 147.36 5 Glenn Hwy (mi 113.5) 

370 61.11 146.28 5 Valdez 

444 62.11 145.55 5 Glennallen 

460 62.26 145.38 5 Gulkana 

408 63.38 148.95 4 Cantwell 

581 64.85 147.71 3 Fairbanks 

61.60 149.08 3 Palmer 

88 51.86 176.66 2 Adak 

163 61.60 149.08 3 Palmer 

166 61.60 149.08 3 Palmer 

68 57.75 152.50 3 Kodiak 

464 61.60 149.08 3 Palmer 

64 61.21 149.89 3 Anchorage 

204 51.86 176.66 2 Adak 

16 64.85 147.71 3 Fairbanks 

23 64.85 147.71 3 Fairbanks 

43 51.86 176.66 5 Adak 

60.07 142.41 3 Cape Yakataga 

209 61.21 149.89 3 Anchorage 

6 64.85 147.71 3 Fairbanks 

128 64.85 147.71 3 Fairbanks 

185 51.86 176.66 1 Adak 

212 61.21 149.89 3 Anchorage 

273 61.60 149.08 3 Palmer 

92 51.86 176.66 1 Adak 

106 55.04 162.31 3 King Cove 
l~q. No. 

2133 

2134 

2135 

2136 

2137 

2138 

2139 

2140 

2141 

2142 

2143 

2144 

2145 

2146 

2147 

2148 

2149 

2150 

2151 

2152 

2153 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

154 

155 

156 

157 

158 

159 

160 

161 

162 

163 

164 

165 

166 

167 

EARTHQUAKE PARAMETERS 

Dat.e Time Epicent.er 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon ow 

1969 04 09 06 49 03.9 67.10 162.30 

1969 04 09 22 34 43.3 64.80 147.50 

1969 04 10 02 04 07.6 

1969 04 15 10 _02 35.4 64.80 147.40 

1969 04 19 19 26 17.3 60.30 146.00 

1969 04 22 10 10 36.3 57.00 154.00 

1969 05 14 10 26 51.3 61.20 149.80 

1969 05 14 19 32 54.2 51.30 179.90 

1969 05 14 20 10 39.3 51.32 179.86 

1969 05 14 22 46 31 51.45 179.73 

1969 05 18 08 44 03.6 60.30 146.00 

1969 05 23 15 44 51.6 51.40 176.60 

1969 05 28 06 48 14.3 60.30 145.80 

1969 06 06 18 05 30 64.90 147.50 

1969 06 09 08 02 17.2 62.40 149.00 

1969 06 11 00 58 10.1 59.60 144.80 

1969 06 11 01 05 01.3 59.59 144.76 

1969 06 18 01 38 46.4 59.50 145.00 

1969 06 19 20 24 59.6 54.20 164.00 

1969 06 21 08 41 21.1 65.20 147.80 

1969 06 22 10 45 24.5 51.50 179.90 

1969 06 22 15 58 17.9 51.58 179.97 

1969 07 03 18 01 48.5 51.70 178.00E 

1969 07 17 20 51 37.5 64.10 147.60 

1969 07 17 20 55 04.3 64.04 14 7.33 

1969 07 17 22 03 36.7 63.98 147.48 

1969 07 31 12 06 44.5 64.90 151.20 

1969 08 01 08 17 

1969 08 04 10 23 28.9 51.40 179.60 

1969 08 06 00 38 42.8 61.40 150.70 

1969 08 25 20 07 57.7 65.10 147.40 

1969 08 27 04 53 13.6 60.10 153.00 

1969 09 12 07 15 50 51.30 179.20 

1969 09 12 08 57 07.3 51.22 179.15 

1969 09 15 14 45 42 51.90 175.50E 

!Mag Dep 

km 

4.2 6 

26 

17 

5.1 21 

3.7 67 

3.9 40 

6.2 21 

5.3 15 

4.6 37 

5.4 6 

4.4 55 

3.3 46 

33 

4.1 54 

5.3 5 

4.9 12 

5.2 33 

5.0 25 

4.1 16 

6.1 56 

4.9 57 

5.1 84 

4.9 31 

4.5 20 

4.2 12 

4.4 33 

5.3 41 

4.8 53 

4.0 52 

4.5 107 

5.0 44 

6.0 48 

5.2 50 

INTENSITY INFORMATION 

6. Obs. Location INT Locality 

km Lat 0 N Lon °W MM 

3 Kotzebue (Near) 

16 64.86 147.80 4 College 

73 65.05 146.06 3 Chena Hot Springs 

51.86 176.66 3 Adak 

16 64.85 147.71 3 Fairbanks 

31 60.55 145.75 3 Cordova 

51 56.55 154.16 4 Sitkinak Island 

5 61.21 149.89 3 Anchorage 

48 51.41 179.23E 5 Amchitka 

233 51.86 176.66 5 Adak 

230 51.86 176.66 1 Adak 

217 51.86 176.66 1 Adak 

31 60.55 145.75 5 Cordova 

235 61.21 149.89 3 Anchorage 

51 51.86 176.66 2 Adak 

28 60.55 145.75 3 Cordova 

11 64.85 147.71 2 Fairbanks 

15 64.86 147.80 2 College 

89 61.60 149.08 3 Palmer 

118 60.55 145.75 3 Cordova 

120 60.55 145.75 3 Cordova 

124 60.55 145.75 3 Cordova 

146 55.18 162.50 3 Cold Bay 

39 64.85 147.71 4 Fairbanks 

48 51.41 179.23E 3 Amchitka 

228 51.86 176.66 3 Adak 

55 51.41 179.23E 3 Amchitka 

91 51.41 179.23E 3 Amchitka 

98 64.98 147.55 4 Gilmore Creek 

84 64.85 147.71 3 Fairbanks 

92 64.85 147.71 2 Fairbanks 

105 64.98 147.55 2 Gilmore Creek 

98 64.85 147.71 3 Fairbanks 

112 64.58 149.33 3 Nenana 

55 65.18 152.16 4 Tanana 

55.18 162.50 4 Cold Bay 

26 51.41 179.23E 3 Amchitka 

48 61.21 149.89 4 Anchorage 

108 62.33 150.11 4 Talkeetna 

89 61.60 149.08 3 Palmer 

97 60.58 151.31 3 Kenai 

33 64.86 147.80 4 College 

31 64.85 147.71 3 Fairbanks 

97 59.63 151.55 3 Homer 

12 51.41 179.23E 3 Amchitka 

22 51.41 179.23E 3 Amchitka 

187 51.86 176.66 3 Adak 

132 52.72 174.11E 3 Shemya 

Table !-Earthquakes and Intensity Data 81 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~~- Date Time Epicent.er Mag Dep b.. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

2108 1969 09 19 07 00 66.88 151.67 4 Bettles Field 

2169 1969 09 26 11 25 17.6 60.10 153.00 4.7 97 93 59.66 151.58 3 Diamond Ridge 

2170 1969 09 29 21 37 36.4 51.70 177.10 4.4 60 35 51.86 176.66 3 Adak 

2171 1969 10 04 08 26 53.9 62.20 149.80 3.7 34 22 62.33 150.11 3 Talkeetna 

110 61.21 149.89 3 Anchorage 

2172 1969 10 10 09 36 09.8 64.80 147.20 3.9 26 25 64.85 147.71 3 Fairbanks 

2173 1969 10 10 10 20 46.5 64.72 147.23 4.0 16 27 64.85 147.71 3 Fairbanks 

2174 1969 10 10 18 56 30.5 60.50 148.70 3.8 6 28 60.75 148.80 3 Whittier 

2175 1969 10 16 21 00 46.5 62.50 151.30 4.0 94 64 62.33 150.11 3 Talkeetna 

162 61.21 149.89 3 Anchorage 

2176 1969 10 18 08 44 00.0 52.50 173.50E 5.6 24 48 52.72 174.11E 4 Shemya 

2177 1969 10 31 11 33 04.8 51.30 179.00 6.0 49 174 51.86 176.66 4 Adak 

2178 1969 11 06 20 20 18.5 51.50 178.90 5.5 36 25 51.41 179.23E 3 Amchitka 

160 51.86 176.66 3 Adak 

2179 1969 11 07 01 52 35.7 62.00 150.30 3.8 61 35 61.70 150.13 4 Willow 

2180 1969 11 16 07 51 11 64.10 147.50 4.4 34 84 64.85 147.71 4 Fairbanks 

86 64.86 147.80 4 College 

87 64.03 145.73 4 Delta Junction 

103 64.58 149.33 4 Nenana 

2181 1969 11 16 19 57 40.3 64.07 147.53 4.4 30 87 64.85 147.71 4 Fairbanks 

89 64.86 147.80 4 College 

104 64.58 149.33 4 Nenana 

2182 1969 11 20 23 46 11.6 56.60 153.20 5.1 33 59 56.55 154.16 4 Sitkinak Island 

2183 1969 11 21 00 29 50.1 56.37 153.60 5.2 12 40 56.55 154.16 4 Sitkinak Island 

2184 1969 11 23 10 30 55.18 162.50 4 Cold Bay 

2185 1969 11 24 09 42 00.0 55.20 162.50 2 55.18 162.50 5 Cold Bay 

22 55.04 162.31 5 King Cove 

2186 1969 11 24 22 51 50.1 56.20 153.60 5.5 33 52 56.55 154.16 4 Sitkinak Island 

2187 1969 12 26 02 30 00.0 55.00 162.30 4 55.04 162.31 5 King Cove 

2188 1969 12 29 09 30 00.0 55.00 162.30 4 55.04 162.31 4 King Cove 

2189 1970 01 06 05 47 54.8 3.5 62.33 150.11 3 Talkeetna 

2190 1970 01 16 05 23 12.2 64.86 147.80 3 College-Fairbanks Area 

2191 1970 01 16 08 05 39.6 60.30 152.70 5.6 91 93 60.48 151.05 5 Soldotna 

98 59.63 151.55 4 Homer 

184 61.21 149.89 4 Anchorage 

220 60.75 148.80 4 Whittier 

567 64.86 147.80 4 College-Fairbanks Area 

138 59.75 154.92 3 Iliamna 

244 61.60 149.08 3 Palmer 

2192 1970 01 16 19 00 59.63 151.55 3 Homer 

2193 1970 01 22 07 33 24.2 64.85 147.71 3 Fairbanks 

2194 1970 02 06 05 59 42.4 64.85 147.71 3 Fairbanks 

2195 1970 02 18 19 20 60.07 142.41 4 Cape Yakataga 

2196 1970 02 27 07 07 58.1 50.10 179.60 6.0 20 148 51.41 179.23E 3 Amchitka 

2197 1970 02 28 10 52 31.2 52.70 175.10 6.1 162 142 51.86 176.66 3 Adak 

318 51.41 179.23E 3 Amchitka 

2198 1970 03 11 22 38 34.6 57.50 153.90 6.0 29 107 56.55 154.16 5 Sitkinak Island 

88 57.75 152.50 4 Kodiak 

2199 1970 03 17 22 00 12.4 59.20 147.90 5.1 47 93 59.43 146.33 2 Middleton Island 

82 U.S. Geological Survey Bulletin 1840 
tEq 

No. 

2200 

2201 

2202 

2203 

2204 

2205 

2206 

2207 

2208 

2209 

2210 

2211 

2212 

2213 

2214 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

215 

216 

217 

218 

219 

220 

221 

222 

223 

224 

225 

226 

227 

228 

229 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1970 03 19 23 33 29.1 51.30 173.80E 

1970 03 27 08 00 52 

1970 04 03 20 19 35.8 

1970 04 05 05 58 31.7 61.43 152.25 

1970 04 07 14 39 20.7 61.80 150.00 

1970 04 11 04 05 41.1 59.70 142.70 

1970 04 11 04 19 39.3 

1970 04 16 05 33 17.5 59.80 142.60 

1970 04 16 18 19 37.5 59.85 142.56 

1970 04 18 08 50 40.5 59.90 152.80 

1970 04 19 01 15 46.8 59.60 142.80 

19'10 04 25 08 35 10.6 65.50 150.00 

1970 05 01 20 58 12.5 63.60 149.40 

1970 05 10 21 32 53.2 61.70 150.00 

1970 06 02 02 59 31.3 61.60 151.70 

1970 06 09 20 10 19.1 64.90 148.80 

1970 06 19 16 38 57.1 

1970 06 19 23 11 43.5 60.30 151.50 

1970 07 04 08 47 45.3 61.50 149.40 

1970 07 06 11 32 39.7 64.80 147.40 

1970 07 13 16 00 41.4 60.40 152.00 

1970 07 18 01 48 38.9 51.40 178.50 

1970 07 18 02 39 59.4 51.03 178.38 

1970 07 19 16 14 50.5 

1970 07 20 13 34 54.6 

1970 07 30 02 16 08.8 60.60 148.60 

1970 08 02 09 01 05.4 51.70 176.90 

1970 08 12 10 41 12.9 51.40 179.20 

1970 08 13 23 03 40.4 51.80 175.50 

1970 08 13 23 04 04.5 

Mag Dep 

km 

5.8 16 

3.2 

3.9 82 

50 

5.2 7 

5.5 7 

4.1 16 

5.7 94 

5.8 20 

3.2 33 

4.0 33 

3.7 55 

5.5 95 

4.1 16 

3.8 62 

3.8 40 

3.7 25 

4.8 104 

5.7 46 

4.4 33 

3.3 

4.7 24 

4.0 52 

4.6 37 

4.1 63 

4.4 

INTENSITY INFORMATION 

ll Obs. Location INT Locality 

km Lat 0 N Lon °W ~M 

159 52.72 174.11E 3 Shemya 

60.11 149.41 3 Seward 

61.60 149.08 2 Palmer 

68 61.01 151.33 4 Tyonek 

53 61.60 149.08 3 Palmer 

164 59.55 139.81 3 Yakutat 

44 60.07 142.41 2 Cape Yakataga 

59.43 146.33 3 Middleton Island 

59.55 139.81 3 Yakutat 

32 60.07 142.41 4 Cape Yakataga 

160 59.55 139.81 3 Yakutat 

194 60.55 145.75 2 Cordova 

26 60.07 142.41 3 Cape Yakataga 

76 59.63 151.55 5 Homer 

96 60.35 151.33 5 Cohoe 

216 61.21 149.89 5 Anchorage 

240 57.75 152.50 3 Kodiak 

277 61.60 149.08 3 Palmer 

368 59.43 146.33 3 Middleton Island 

397 60.55 145.75 3 Cordova 

463 62.11 145.55 3 Glennallen 

486 61.50 144.52 3 Chitina 

169 59.55 139.81 3 Yakutat 

125 64.86 147.80 3 College 

109 64.58 149.33 4 Nenana 

32 63.83 149.02 3 Healy 

33 63.33 149.13 3 Summit 

30 61.58 149.50 4 Wasilla 

50 61.60 149.08 3 Palmer 

55 61.21 149.89 2 Anchorage 

106 61.21 149.89 4 Anchorage 

116 62.33 150.11 3 Talkeetna 

139 61.60 149.08 3 Palmer 

17 64.75 148.79 3 Dunbar 

52 64.85 147.71 3 Fairbanks 

61.60 149.08 3 Palmer 

32 60.48 151.05 3 Soldotna 

42 61.21 149.89 3 Anchorage 

20 64.86 147.80 4 College 

86 61.00 151.00 3 Upper Cook Inlet 

119 60.00 150.00 3 Kenai Peninsula 

137 51.86 176.66 4 Adak 

151 51.86 176.66 4 Adak 

61.60 149.08 3 Palmer 

64.85 147.71 3 Fairbanks 

98 61.21 149.89 3 Anchorage 

24 51.86 176.66 4 Adak 

183 51.86 176.66 2 Adak 

80 51.86 176.66 1 Adak 

51.86 176.66 1 Adak 

Table 1-Earthquakes and Intensity Data 83 
I:Eq. 

No. 

2230 

2231 

2232 

2233 

2234 

2235 

2236 

2237 

2238 

2239 

2240 

2241 

2242 

2 243 

2244 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

245 

246 

247 

248 

249 

250 

251 

252 

253 

254 

255 

256 

257 

258 

259 

260 

EARTHQUAKE PARAMETERS 

Da.te Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon ow 

1970 08 14 03 39 33.5 64.90 147.80 

1970 08 14 05 56 07.7 64.73 147.68 

1970 08 15 17 52 06 

1970 08 16 17 27 39 

1970 08 18 16 07 20.3 64.70 147.50 

1970 08 18 17 52 06.3 60.70 145.38 

1970 08 24 12 43 34.6 

1970 08 28 22 08 18.5 

1970 08 29 16 40 

1970 08 29 22 20 12.7 

1970 08 30 17 29 

1970 09 02 22 04 07.9 64.60 150.90 

1970 09 03 05 04 61.78 166.03 

1970 09 03 08 52 20.8 64.60 150.90 

1970 09 17 02 41 39 62.80 150.40 

1970 09 19 02 25 31 60.90 151.50 

1970 09 23 21 02 54.6 51.40 179.40 

1970 09 23 21 07 20 

1970 09 23 22 59 00.7 64.79 147.75 

1970 10 04 21 14 51.3 51.60 178.90E 

1970 10 09 11 07 20.2 51.40 178.40 

1970 10 11 19 30 

1970 10 16 07 03 26.5 62.00 146.60 

1970 10 21 17 56 10.1 62.40 151.10 

1970 10 26 13 49 06.3 61.50 145.90 

1970 10 26 17 30 08.1 

1970 10 31 14 27 04.5 

1970 10 31 15 51 38.4 62.19 148.68 

1970 10 31 16 08 41.7 51.20 179.40 

1970 11 01 17 12 00.7 60.30 154.20 

1970 11 03 02 30 11.4 62.00 151.20 

84 U.S. Geological Survey Bulletin 1840 

Mag Dep 

km 

5.0 19 

4.0 15 

3.4 15 

5.6 16 

4.6 16 

3.9 14 

3.9 94 

4.6 66 

5.2 43 

15 

3.5 67 

5.2 41 

104 

3.9 44 

102 

4.7 45 

4.2 44 

5.0 39 

4.4 182 

5.6 70 

INTENSITY INFORMATION 

~ Obs. Location INT Locality 

km Lat 0 N Lon ow tMM 

4 64.86 147.80 5 College 

7 64.85 147.71 5 Fairbanks 

43 64.66 147.10 5 Eielson AFB 

81 64.58 149.33 5 Nenana 

47 64.70 148.68 4 Nenana Road (mi 17.0} 

77 65.52 148.54 4 Livengood 

141 63.99 145.75 3 Fort Greely 

155 65.57 144.90 3 Central 

298 67.41 150.10 3 Wiseman 

13 64.85 147.71 4 Fairbanks 

64.86 147.80 3 College 

64.86 147.80 3 College 

19 64.85 147.71 4 Fairbanks 

20 64.66 147.10 3 Eielson AFB 

26 60.55 145.75 4 Cordova 

251 61.21 149.89 4 Anchorage 

223 61.60 149.08 3 Palmer 

57.75 152.50 3 Kodiak 

64.86 147.80 3 College 

61.21 149.89 4 Anchorage 

64.86 147.80 3 Col1ege 

64.50 165.41 4 Nome 

46 65.00 150.63 4 Manley Hot Springs 

150 64.86 147.80 3 Col1ege 

6 61.82 166.10 4 Cape Romanzof 

150 64.86 147.80 3 College 

150 61.60 149.08 2 Palmer 

93 61.21 149.89 3 Anchorage 

12 51.41 179.23E 2 Amchitka 

197 51.86 176.66 2 Adak 

51.86 176.66 3 Adak 

8 64.86 147.80 3 College 

31 51.41 179.23E 3 Amchitka 

131 51.86 176.66 1 Adak 

59.05 138.56 3 Alsek River 

70 62.26 145.38 3 Gulkana 

138 61.60 149.08 3 Palmer 

48 61.11 146.28 4 Valdez 

64.85 147.71 3 Fairbanks 

51.86 176.66 1 Adak 

69 61.60 149.08 3 Palmer 

204 51.86 176.66 1 Adak 

166 59.08 152.50 3 Cook Inlet 

256 61.21 149.89 3 Anchorage 

313 61.60 149.08 3 Palmer 

68 62.33 150.11 5 Talkeetna 

182 63.33 149.13 4 Summit 

220 63.90 152.36 4 Lake Minchumina 

112 61.21 149.89 3 Anchorage 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~· Date Time Epicent.er Mag Dep fj. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

2260 1970 11 03 02 30 11.4 62.00 151.20 5.6 70 120 61.60 149.08 3 Palmer 

2261 1970 11 03 23 03 13.6 62.03 150.69 3.7 57 97 61.60 149.08 3 Palmer 

2262 1970 11 13 12 28 12.2 64.86 147.80 3 College 

2263 1970 11 13 13 10 25.4 51.60 175.30 4.9 51 98 51.86 176.66 1 Adak 

2264 1970 11 14 08 26 51.2 64.85 147.71 3 Fairbanks 

2265 1970 11 20 11 13 07.3 51.40 178.30 5.1 34 125 51.86 176.66 1 Adak 

2266 1970 11 21 06 54 41.8 61.60 149.08 3 Palmer 

2267 1970 11 30 18 19 06.1 59.70 150.60 4.0 50 54 59.63 151.55 3 Homer 

55 59.66 151.58 3 Diamond Ridge 

2268 1970 12 01 21 09 37.2 51.40 175.30 5.6 36 107 51.86 176.66 2 Adak 

2269 1970 12 02 02 34 59.5 51.40 175.20 5.4 57 113 51.86 176.66 1 Adak 

2270 1970 12 02 09 03 14.6 51.43 175.24 5.2 52 109 51.86 176.66 1 Adak 

2271 1970 12 06 23 06 43 51.86 176.66 1 Adak 

2272 1970 12 15 03 44 01.5 52.40 176.20 4.8 189 68 51.86 176.66 1 Adak 

2273 1970 12 20 06 01 36.1 63.10 151.40 5.3 130 102 62.41 150.10 3 Susitna River Valley 

206 61.60 149.08 3 Palmer 

225 61.21 149.89 3 Anchorage 

2274 1970 12 24 08 22 20.8 51.50 178.30 5.3 53 120 51.86 176.66 3 Adak 

2275 1970 12 25 14 43 41 51.80 175.20 4.7 64 101 51.86 176.66 1 Adak 

2276 1970 12 28 02 56 57.5 61.60 149.60 3.8 47 28 61.60 149.08 3 Palmer 

2277 1971 01 05 05 55 34.0 61.42 147.55 4.5 46 127 61.21 149.89 3 Anchorage 

2278 1971 01 05 14 45 32.8 3.5 61.21 149.89 3 Anchorage 

2279 1971 01 07 02 49 57.5 52.44 173.32 5.8 87 238 51.86 176.66 4 Adak 

2280 1971 01 08 22 49 54.6 4.0 51.86 176.66 1 Adak 

2281 1971 01 16 17 44 64.85 147.71 3 Fairbanks 

2282 1971 01 25 16 08 15.1 51.47 177.69 5.9 38 83 51.86 176.66 5 Adak 

232 52.12 174.50 4 Atka Island 

2283 1971 01 25 22 35 32.1 3.0 64.86 147.80 3 College 

2284 1971 01 26 19 32 04.9 51.67 174.92 5.4 36 58 52.12 174.50 3 Atka Island 

122 51.86 176.66 3 Adak 

2285 1971 01 29 23 38 11.6 64.85 147.71 3 Fairbanks 

2286 1971 02 01 14 59 12.6 62.33 145.68 4.6 15 17 62.26 145.38 5 Gulkana 

2287 1971 02 02 02 16 30.3 62.23 151.15 3.5 79 55 62.33 150.11 3 Talkeetna 

2288 1971 02 03 19 42 48.8 64.85 147.71 3 Fairbanks 

2289 1971 02 03 19 52 25.4 64.85 147.71 3 Fairbanks 

2290 1971 02 04 20 42 57.3 64.85 147.71 3 Fairbanks 

2291 1971 02 07 02 29 28.2 51.36 176.72 6.0 50 56 51.86 176.66 5 Adak 

2292 1971 02 07 02 33 39.1 51.36 176.72 56 51.86 176.66 3 Adak 

2293 1971 02 07 02 42 04.5 51.20 177.10 5.8 49 80 51.86 176.66 3 Adak 

2294 1971 02 07 03 03 18.3 51.75 177.26 4.5 52 43 51.86 176.66 1 Adak 

2295 1971 02 07 03 19 12.2 51.20 176.96 5.2 21 76 51.86 176.66 1 Adak 

2296 1971 02 07 03 20 59.9 51.10 177.00 5.4 43 88 51.86 176.66 2 Adak 

2297 1971 02 08 02 29 11.4 51.29 178.83 5.2 44 163 51.86 176.66 1 Adak 

2 298 1971 02 18 09 52 22.2 64.86 147.80 4 College 

64.85 147.71 3 Fairbanks 

2 299 1971 02 23 05 50 64.85 147.71 3 Fairbanks 

2 300 1971 03 02 09 42 12.6 51.81 176.80 4.5 59 11 51.86 176.66 1 Adak 

Table 1-Earthquakes and Intensity Data 85 
~Eq No. 

2301 

2302 

2303 

2304 

2305 

2306 

2307 

2308 

2309 

2310 

2311 

2312 

2313 

2314 

2315 

2316 

2317 

2318 

2319 

2320 

2321 

2322 

2323 

2324 

2325 

2326 

2327 

2328 

2329 

2330 

2331 

2332 

2 

2 

2 

2 

333 

334 

335 

336 

EARTHQUAKE PARAMETERS 

Date Time Epicent.er 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1971 03 10 11 58 01.4 

1971 03 11 15 25 45.9 59.33 146.65 

1971 03 19 03 32 19.4 

1971 03 25 03 31 53.6 52.52 176.76 

1971 03 25 17 43 15.0 

1971 03 26 17 35 18.0 60.34 140.99 

1971 03 27 17 09 52.3 52.55 174.53 

1971 03 30 11 30 38.9 51.19 177.49 

1971 04 01 07 39 29.7 60.09 149.24 

1971 04 02 14 50 49.8 61.44 150.09 

1971 04 09 00 51 13.4 51.52 178.78E 

1971 04 13 20 18 21.2 

1971 04 14 15 18 12.6 64.90 147.70 

1971 04 15 11 38 32.8 62.21 150.72 

1971 04 16 20 38 50.3 64.60 147.13 

1971 04 24 17 48 42.2 

1971 04 30 14 05 49.0 51.70 179.93E 

1971 04 30 15 48 06.5 52.80 172.50E 

1971 05 01 06 49 54.7 64.90 148.00 

1971 05 02 06 08 27.3 51.43 177.21 

1971 05 02 09 08 59.2 51.54 177.21 

1971 05 03 11 26 23.7 

1971 05 10 22 58 05.2 51.42 177.24 

1971 05 10 23 02 20.7 

1971 05 13 01 02 00.0 

1971 05 18 06 34 54.4 61.71 149.56 

1971 05 18 14 13 46.9 60.00 151.90 

1971 05 21 18 56 43.7 52.55 173.22 

1971 05 ·31 04 55 08.7 

1971 06 02 19 06 32.9 61.03 151.26 

1971 06 07 16 02 04.1 51.53 176.92 

1971 06 07 16 06 15.7 

1971 06 11 13 58 37.7 51.49 176.G8E 

1971 06 12 14 00 34.0 

1971 06 17 21 00 38.9 61.80 149.80 

1971 06 21 09 36 52.6 51.68 177.25 

86 U.S. Geological Survey Bulletin 1840 

Mag Dep 

km 

3.5 

5.0 18 

4.5 

5.3 11 

5.0 

5.5 7 

5.6 138 

5.7 20 

4.3 16 

3.7 47 

4.9 55 

3.7 

4.1 24 

3.3 27 

4.2 25 

3.2 

5.2 93 

5.5 37 

3.3 26 

6.0 43 

5.3 47 

5.3 50 

2.9 9 

3.9 74 

5.7 36 

3.5 

5.0 29 

4.3 49 

5.9 32 

3.8 65 

4.6 57 

INTENSITY INFORMATION 

~ Obs. Location INT Locality 

km Lat 0 N Lon °W ~M 

51.86 176.66 1 Adak 

21 59.43 146.33 2 Middleton Island 

51.86 176.66 1 Adak 

74 51.86 176.66 1 Adak 

59.55 139.81 1 Yakutat 

110 59.55 139.81 4 Yakutat 

165 51.86 176.66 1 Adak 

94 51.86 176.66 3 Adak 

10 60.11 149.41 4 Seward 

28 61.21 149.89 3 Anchorage 

34 51.41 179.23E 3 Amchitka 

51.86 176.66 1 Adak 

7 64.86 147.80 5 College 

9 64.85 147.55 5 Fort Wainwright 

34 62.33 150.11 1 Talkeetna 

19 64.74 147.35 3 North Pole 

26 64.41 146.83 3 Harding Lake 

61.60 149.08 3 Palmer 

58 51.41 179.23E 4 Amchitka 

53 52.94 173.25E 2 Attu 

109 52.72 174.11E 2 Shemya 

10 64.86 147.80 4 College 

15 64.85 147.71 4 Fairbanks 

22 64.85 147.55 4 Fort Wainwright 

61 51.86 176.66 4 Adak 

141 51.41 179.23E 3 Amchitka 

52 51.86 176.66 3 Adak 

64.86 147.80 3 College 

63 51.86 176.66 2 Adak 

51.86 176.66 3 Adak 

64.86 147.80 4 College 

15 61.58 149.50 2 Wasilla 

28 61.60 149.08 2 Palmer 

30 61.70 150.13 2 Willow 

58 61.21 149.89 1 Anchorage 

46 59.63 151.55 2 Homer 

247 51.86 176.66 2 Adak 

51.86 176.66 1 Adak 

76 61.21 149.89 4 Anchorage 

50 60.58 151.31 2 Kenai 

133 61.60 149.08 1 Palmer 

41 51.86 176.66 1 Adak 

51.86 176.66 1 Adak 

192 52.72 174.11E 4 Shemya 

64.86 147.80 4 College 

64.85 147.55 4 Fort Wainwright 

44 61.60 149.08 1 Palmer 

45 51.86 176.66 2 Adak 
~~·. o. 

2337 

2338 

2339 

2340 

2341 

2342 

2343 

2344 

2345 

2346 

2347 

2348 

2349 

2350 

2351 

2352 

2353 

2354 

2355 

2356 

2357 

2358 

2359 

2360 

2 361 

2362 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

363 

364 

365 

366 

367 

368 

369 

370 

371 

372 

373 

374 

375 

376 

EARTHQUAKE PARAMETERS 

Da.t.e Time Epicent.er 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1971 06 29 14 03 19.0 54.65 161.59 

1971 06 29 20 01 23.2 61.35 145.20 

1971 07 12 09 03 

1971 07 15 00 24 02.3 54.22 133.73 

1971 07 25 14 54 

1971 07 25 15 41 21.3 52.15 173.10E 

1971 07 26 16 17 35.6 63.28 149.73 

1971 07 30 06 05 56.7 

1971 08 05 13 51 08.3 55.65 165.00 

1971 08 05 20 44 12.6 51.40 176.74 

1971 08 10 14 42 24.6 65.47 149.96 

1971 08 13 12 51 09.0 51.80 176.54 

1971 08 21 22 43 38.4 54.28 162.49 

1971 08 26 14 05 29.0 

1971 08 27 14 05 13.7 51.40 177.80 

1971 09 04 15 53 25.4 54.98 163.36 

1971 09 06 05 56 14.9 64.79 147.68 

1971 09 16 23 27 45.5 51.79 175.64 

1971 09 18 02 12 39.3 51.89 178.63E 

1971 09 19 09 24 07.3 51.77 176.94 

1971 09 19 19 41 

1971 09 20 20 15 

1971 09 24 04 25 

1971 09 30 11 52 36.6 51.31 178.78E 

1971 10 12 16 45 35.0 52.64 174.19E 

1971 10 13 14 01 47.3 51.95 179.59 

1971 10 15 18 26 12.8 45.45 176.69 

1971 10 29 13 16 36.2 60.22 153.46 

1971 11 03 15 44 58.6 52.02 177.31 

1971 11 06 22 00 00.1 51.47 179.11E 

1971 11 15 09 32 02.2 51.68 176.14 

1971 11 22 00 46 11.1 52.27 17 4.32E 

1971 11 23 10 02 00.6 51.85 176.19 

1971 11 24 19 35 29.1 52.90 159.20E 

1971 11 24 22 36 45.1 

1971 11 29 15 24 52.3 64.82 147.34 

1971 11 30 06 43 56.5 51.11 179.54E 

1971 11 30 08 50 56.0 

1971 12 01 08 03 57.7 61.65 149.28 

1971 12 03 07 27 25.8 51.63 177.18 

Ma.g Dep 

km 

5.1 24 

3.9 33 

5.2 33 

5.8 28 

4.1 33 

5.2 33 

4.1 40 

4.3 33 

4.1 59 

5.2 33 

5.0 52 

5.8 107 

3.2 24 

4.6 64 

4.6 112 

4.2 57 

5.0 41 

4.4 29 

5.3 95 

4.9 16 

4.7 141 

4.4 97 

6.8 2 

5.2 54 

5.6 43 

4.8 68 

6.3 106 

3.8 

3.1 25 

5.0 44 

3.7 24 

4.7 63 

INTENSITY INFORMATION 

A Obft. Locnt.ion INT Localit.y 

km La.t 0 N Lon °W MM 

63 55.04 162.31 4 King Cove 

83 55.18 162.50 4 Cold Bay 

94 60.55 145.75 1 Cordova 

122 61.43 142.92 1 McCarthy 

63.33 149.13 4 Summit 

188 55.36 131.58 3 Ketchikan 

335 57.06 135.50 3 Sitka 

52.72 174.11E 3 Shemya 

93 52.72 174.11E 1 Shemya 

31 63.33 149.13 4 Summit 

41 63.38 148.95 4 Cantwell 

51.86 176.66 1 Adak 

167 55.18 162.50 5 Cold Bay 

51 51.86 176.66 2 Adak 

122 64.86 147.80 3 College 

11 51.86 176.66 2 Adak 

100 55.18 162.50 3 Cold Bay 

51.86 176.66 1 Adak 

94 51.86 176.66 1 Adak 

59 55.18 162.50 4 Cold Bay 

7 64.85 147.71 3 Fairbanks 

71 51.86 176.66 1 Adak 

68 51.41 179.23E 3 Amchitka 

22 51.86 176.66 3 Adak 

65.00 150.63 4 Manley Hot Springs 

64.86 147.80 3 College 

65.00 150.63 3 Manley Hot Springs 

63.90 152.36 4 Lake Minchumina 

33 51.41 179.23E 3 Amchitka 

10 52.72 174.11E 5 Shemya 

202 51.86 176.66 1 Adak 

713 51.86 176.66 1 Adak 

125 59.63 151.55 3 Homer 

48 51.86 176.66 1 Adak 

175 51.86 176.66 4 Adak 

41 51.86 176.66 4 Adak 

52 52.72 174.11E 4 Shemya 

120 52.12 174.50 5 Atka Island 

32 51.86 176.66 4 Adak 

1006 52.72 174.11E 4 Shemya 

51.86 176.66 1 Adak 

22 64.86 147.80 4 College 

40 51.41 179.23E 3 Amchitka 

61.60 149.08 2 Palmer 

12 61.60 149.08 4 Palmer 

59 61.21 149.89 3 Anchorage 

44 51.86 176.66 3 Adak 

Table 1-Earthquakes and Intensity Data 87 
I~· No. 

2377 

2378 

2379 

2380 

2381 

2382 

2383 

2384 

2385 

2386 

2387 

2388 

2389 

2390 

2391 

2392 

2393 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

394 

395 

396 

397 

398 

399 

400 

401 

402 

403 

404 

405 

406 

407 

408 

409 

410 

411 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1971 12 08 13 00 15.0 51.72 178.43E 

1971 12 09 00 23 24.4 

1971 12 17 00 05 19.1 55.10 161.18 

1971 12 23 20 18 36.3 60.66 151.57 

1971 12 26 13 19 02.0 50.57 175.14 

1971 12 30 17 56 03.5 61.15 150.36 

1971 12 31 19 51 18.8 51.90 179.93 

1972 01 03 17 06 22.3 51.14 178.90E 

1972 01 14 00 21 29.2 64.69 147.61 

1972 01 15 23 30 

1972 01 23 11 35 59.7 52.03 178.67 

1972 01 30 02 12 11.4 51.80 176.59 

1972 01 31 22 31 44.3 62.07 150.48 

1972 02 01 00 24 30.7 51.77 177 .66E 

1972 02 13 22 40 16.2 59.94 154.20 

1972 02 15 11 21 49.7 51.41 177.45 

1972 02 21 19 34 50.9 55.90 158.27 

1972 02 22 19 07 29.1 51.40 175.98 

1972 02 23 04 35 

1972 02 24 01 43 04.5 55.83 158.25 

1972 02 25 09 26 59 61.16 149.41 

1972 03 02 19 07 08.6 51.40 177.52 

1972 03 14 05 16 49.8 59.99 147.70 

1972 03 19 06 24 09.3 62.41 150.58 

1972 03 20 23 31 48.8 51.29 179.22 

1972 03 21 09 47 38.3 50.01 176.17 

1972 03 23 11 00 

1972 03 24 03 38 27.1 56.14 157.18 

1972 04 02 00 29 02 

1972 04 05 02 19 39.3 

1972 04 05 13 

1972 04 06 11 10 04.8 52.05 174.98E 

1972 04 07 03 16 22.6 60.13 152.75 

1972 04 16 18 35 39.3 63.53 147.71 

1972 04 17 01 02 01.5 51.55 177.37 

88 U.S. Geological Survey Bulletin 1840 

~ag Dep 

km 

5.2 81 

4.5 33 

3.7 67 

5.2 33 

4.1 41 

5.4 99 

5.5 46 

4.1 12 

4.9 102 

4.4 70 

3.7 74 

5.2 57 

4.9 153 

4.9 50 

5.7 60 

4.2 43 

5.3 66 

3.5 45 

4.2 56 

4.4 34 

3.2 25 

6.0 46 

5.4 33 

6.0 69 

4.8 56 

5.1 98 

4.1 11 

4.6 53 

INTENSITY INFORMATION 

!::. Obs. Location INT Locality 

km Lat 0 N Lon °W MM 

65 51.41 179.23E 2 Amchitka 

123 51.86 176.66 1 Adak 

57.06 135.50 4 Sitka 

72 55.04 162.31 3 King Cove 

17 60.58 151.31 3 Kenai 

110 61.21 149.89 2 Anchorage 

170 61.60 149.08 1 Palmer 

179 51.86 176.66 2 Adak 

26 61.21 149.89 4 Anchorage 

85 61.60 149.08 1 Palmer 

225 51.86 176.66 2 Adak 

175 51.86 176.66 2 Adak 

18 64.85 147.71 3 Fairbanks 

64.50 165.41 3 Nome 

140 51.86 176.66 3 Adak 

8 51.86 176.66 3 Adak 

35 62.33 150.11 2 Talkeetna 

156 63.33 149.13 2 Summit 

116 51.41 179.23E 2 Amchitka 

153 59.63 151.55 1 Homer 

175 60.58 151.31 1 Kenai 

275 61.21 149.89 1 Anchorage 

335 61.60 149.08 1 Palmer 

74 51.86 176.66 4 Adak 

46 56.30 158.45 5 Chignik 

345 54.86 163.40 4 False Pass 

446 54.75 165.00 4 Unimak Island 

1286 56.91 158.68 2 Port Heiden 

52.72 174.11E 5 Shemya 

54 56.30 158.45 4 Chignik 

344 54.86 163.40 3 False Pass 

445 54.75 165.00 3 Unimak Island 

26 61.21 149.89 3 Anchorage 

79 51.86 176.66 2 Adak 

11 60.00 147.50 3 Montague Island 

26 62.33 150.11 3 Talkeetna 

13 51.41 179.23E 4 Amchitka 

188 51.86 176.66 4 Adak 

209 51.86 176.66 3 Adak 

64.85 147.71 4 Fairbanks 

126 56.91 158.68 4 Port Heiden 

283 58.67 156.66 2 King Salmon 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

52.72 174.11E 4 Shemya 

95 52.72 174.11E 5 Shemya 

87 59.63 151.55 5 Homer 

148 64.86 147.80 3 College-Fairbanks Area 

60 51.86 176.66 3 Adak 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

IF4· Date Time Epicenter Mag Dep ll Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

2412 1972 04 20 15 14 49.4 60.19 152.14 4.7 85 71 59.63 151.55 5 Homer 

2413 1972 04 21 01 28 09.5 54.01 166.85 5.8 103 27 53.86 166.53 5 Unalaska 

141 54.56 164.90 3 Cape Sarichef 

179 52.94 168.86 3 Nikolski 

2414 1972 04 24 07 18 55.6 4.4 51.86 176.66 2 Adak 

2415 1972 04 25 13 35 54.1 61.98 148.82 4.6 58 30 61.71 148.86 3 Sutton 

103 61.21 149.89 3 Anchorage 

2416 1972 04 27 07 40 06.4 64.85 147.71 3 Fairbanks 

64.85 147.55 2 Fort Wainwright 

2417 1972 04 27 19 30 22.6 51.86 176.66 2 Adak 

2418 1972 05 03 04 49 06.8 51.45 179.21 5.3 56 182 51.86 176.66 2 Adak 

2419 1972 05 07 03 18 59.63 151.55 5 Homer 

2420 1972 05 07 05 28 07.6 51.44 176.84 40 48 51.86 176.66 2 Adak 

2421 1972 05 08 03 44 08.8 64.75 147.50 8 15 64.85 147.71 3 Fairbanks 

2422 1972 05 12 06 53 04.4 66.12 157.19 4.0 33 55 66.00 156.00 5 Hog River 

2423 1972 05 20 06 43 43.1 57.83 153.82 5.2 59 79 57.75 152.50 2 Kodiak 

2424 1972 05 23 17 32 36.5 61.21 149.89 2 Anchorage 

2425 1972 06 06 02 19 41.6 51.58 178.27 5.3 51 116 51.86 176.66 3 Adak 

2426 1972 06 09 06 53 16.7 5L86 176.66 3 Adak 

2427 1972 06 12 19 47 37.2 53.35 166.79 5.8 44 59 53.86 166.53 3 Unalaska 

2428 1972 06 14 00 52 35.7 60.50 153.41 5.2 152 3 Anchorage-Palmer Area 

197 60.00 150.00 3 Kenai Peninsula 

2429 1972 06 19 01 02 53.9 52.19 175.03E 5.3 53 86 52.72 174.11E 5 Shemya 

147 52.94 173.25E 3 Attu 

2430 1972 06 19 01 09 17.7 52.05 175.15E 4.7 62 103 52.72 174.11E 3 Shemya 

2431 1972 06 22 05 57 34.2 61.42 147.49 4.5 48 114 61.09 145.48 2 Valdez Hwy (mi 36.0) 

2432 1972 07 18 02 50 52.72 174.11E 3 Shemya 

2433 1972 07 20 01 35 52.7 61.15 146.65 3.5 33 20 61.11 146.28 4 Valdez 

2434 1972 07 20 17 17 15 61.11 146.28 4 Valdez 

2435 1972 07 25 18 06 22 51.23 176.79 4.0 48 71 51.86 176.66 2 Adak 

2436 1972 07 27 10 12 32.1 51.08 179.26 4.8 46 200 51.86 176.66 2 Adak 

2437 1972 07 28 08 49 03.1 52.57 173.21E 5.3 46 41 52.94 173.25E 5 Attu 

63 52.72 174.11E 5 Shemya 

2438 1972 07 30 21 45 14.1 56.82 135.68 6.5 25 8 56.88 135.60 7 Onboard Ship 

19 56.99 135.70 '1 Saint Lazaria Islands 

29 57.06 135.50 7 Sitka 

159 55.67 134.17 7 Onboard Ship 

10 56.85 135.53 6 Biorka Island 

49 56.70 134.91 6 Auoss Lake 

131 57.96 136.22 6 Pelican 

143 58.10 135.41 6 Hoonah 

182 58.30 134.41 6 Juneau 

389 59.55 139.81 6 Yakutat 

5 Hoonah Mountain 

45 56.58 135.08 5 Whale Bay 

110 57.77 135.21 5 Tenakee Springs 

167 56.81 132.95 5 Petersburg 

177 58.41 135.83 5 Gustavus 

202 56.45 132.46 5 Wrangell 

213 55.58 133.06 5 Klawock 

Table 1-Earthquakes and Intensity Data 89 
~Eq. No. 

2438 

2439 

2440 

2441 

2442 

2443 

2444 

2445 

2446 

2447 

2448 

2449 

2450 

2451 

2452 

2453 

2454 

2455 

2456 

2457 

2458 

2459 

2460 

2461 

2462 

2463 

2464 

2465 

2 

2 

466 

467 

2468 

2 

2 

2 

2 

2 

2 

2 

2 

469 

470 

471 

472 

473 

474 

475 

476 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat. 0 N Lon °W 

1972 07 30 21 45 14.1 56.82 135.68 

1972 07 30 23 02 29.5 

1972 08 01 11 20 38.3 

1972 08 03 03 51 14.1 63.39 147.59 

1972 08 03 04 40 54.9 51.20 178.12 

1972 08 03 04 46 05.9 

1972 08 03 05 35 16.4 51.21 177.87 

1972 08 03 06 59 45.9 51.21 178.15 

1972 08 03 07 03 14.2 51.20 177.96 

1972 08 04 01 28 31.1 51.50 178.47 

1972 08 04 09 48 11 56.22 135.53 

1972 08 04 11 38 08.3 56.20 135.34 

1972 08 04 16 52 39.1 51.17 177.99 

1972 08 06 15 23 15.6 

1972 08 07 08 33 53 

1972 08 08 22 42 45 

1972 08 08 23 57 27.7 51.26 177.95 

1972 08 10 21 40 10.6 

1972 08 11 07 26 41 

1972 08 12 09 42 05.2 51.38 179.32 

1972 08 15 10 56 12.8 56.25 135.50 

1972 08 15 21 39 04.2 65.15 148.75 

1972 08 18 00 41 56.5 

1972 08 23 01 21 17.7 51.43 176.64 

1972 08 23 08 47 16 58.25 153.58 

1972 08 26 04 56 14.7 

1972 08 27 20 31 17.5 

1972 08 28 15 21 01.8 51.37 179.22 

1972 08 28 15 25 24.1 

1972 08 29 08 25 40.5 

1972 08 29 20 29 43.8 

1972 09 01 14 30 50.6 51.38 178.13 

1972 09 07 17 19 24 61.68 150.63 

1972 09 11 03 03 50.0 59.63 148.94 

1972 09 13 21 09 32.0 51.36 175.43 

1972 09 14 07 02 

1972 09 20 22 10 15.4 51.79 174.02E 

1972 09 23 10 40 12.9 51.23 175.01 

1972 09 24 08 02 06.6 

90 U.S. Geological Survey Bulletin 1840 

tMag Dep 

km 

6.5 25 

3.8 16 

5.8 49 

4.8 49 

5.5 45 

5.4 48 

5.0 60 

5.1 18 

5.6 20 

4.2 46 

4.9 67 

5.9 29 

5.6 21 

4.3 20 

3.8 43 

5.5 61 

5.5 45 

5.2 63 

83 

5.1 27 

4.2 52 

5.0 26 

4.8 41 

INTENSITY INFORMATION 

f1 Obs. Location INT Locality 

km Lat 0 N Lon ow MM 

286 59.38 135.33 5 Skagway 

303 55.36 131.58 5 Ketchikan 

324 55.05 131.56 4 Annette 

318 55.13 131.58 3 Metlakatla 

57.06 135.50 3 Sitka 

57.06 135.50 1 Sitka 

214 61.60 149.08 2 Palmer 

125 51.86 176.66 6 Adak 

51.86 176.66 2 Adak 

111 51.86 176.66 3 Adak 

126 51.86 176.66 3 Adak 

116 51.86 176.66 4 Adak 

131 51.86 176.66 2 Adak 

94 57.06 135.50 2 Sitka 

96 57.06 135.50 5 Sitka 

162 56.81 132.95 5 Petersburg 

248 58.41 135.83 5 Gustavus 

241 58.30 134.41 4 Juneau 

120 51.86 176.66 2 Adak 

57.06 135.50 1 Sitka 

57.06 135.50 3 Sitka 

51.86 176.66 1 Adak 

112 51.86 176.66 3 Adak 

57.06 135.50 1 Sitka 

57.06 135.50 1 Sitka 

192 51.86 176.66 3 Adak 

241 58.41 135.83 5 Gustavus 

90 57.06 135.50 3 Sitka 

238 58.30 134.41 3 Juneau 

55 64.86 147.80 4 College-Fairbanks Area 

62.33 150.11 2 Talkeetna 

48 51.86 176.66 2 Adak 

85 57.75 152.50 4 Kodiak 

57.06 135.50 2 Sitka 

57.06 135.50 3 Sitka 

186 51.86 176.66 4 Adak 

51.86 176.66 3 Adak 

57.06 135.50 1 Sitka 

57.06 135.50 1 Sitka 

115 51.86 176.66 5 Adak 

66 61.21 149.89 2 Anchorage 

184 61.21 149.89 2 Anchorage 

102 51.86 176.66 2 Adak 

64.86 147.80 3 College 

64.85 147.71 2 Fairbanks 

104 52.72 174.11E 2 Shemya 

134 51.86 176.66 2 Adak 

64.85 147.71 3 Fairbanks 
IEq 

No. 

2477 

2478 

2479 

2480 

2481 

2482 

2483 

2484 

2485 

2486 

2487 

2488 

2489 

2490 

2491 

2492 

2493 

2494 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

495 

496 

497 

498 

499 

500 

501 

502 

503 

504 

505 

506 

507 

508 

509 

510 

511 

EARTHQUAKE PARAMETERS 

Date Time Epicent.er 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1972 10 01 10 08 49.7 62.74 149.08 

1972 10 01 21 43 44.7 51.69 177.07 

1972 10 02 20 05 

1972 10 04 05 41 08.6 62.90 159.59 

1972 10 12 07 32 10.1 64.61 148.12 

1972 10 13 10 54 33.9 51.73 175.89 

1972 10 14 03 29 33.1 51.75 175.30 

1972 10 15 19 34 42.6 51.78 175.35 

1972 10 20 07 55 

1972 10 21 19 52 05.4 63.15 151.06 

1972 10 23 00 40 

1972 10 25 15 03 33.1 61.30 150.50 

1972 10 27 18 18 14.7 61.52 150.35 

1972 10 27 20 45 

1972 10 30 20 46 24.3 51.97 177.55 

1972 10 30 22 20 28 

1972 11 02 22 57 30.8 64.56 147.63 

1972 11 13 09 25 51.2 53.79 169.04 

1972 11 17 16 41 34.7 56.04 135.53 

1972 11 21 17 01 55.3 52.45 173.61E 

1972 11 28 13 35 37.4 65.75 145.69 

1972 11 30 15 30 16.5 51.99 175.35 

1972 12 07 22 19 51.3 

1972 12 15 16 21 54.6 60.74 151.37 

1972 12 15 20 09 01.6 61.20 149.33 

1972 12 18 17 11 38.9 

1972 12 22 01 24 01 

1972 12 23 02 17 40.9 51.27 179.12E 

1972 12 26 22 03 42.2 51.67 176.28 

1972 12 31 13 59 59.8 

1973 01 05 07 13 30.2 

1973 01 09 11 57 21 60.31 146.00 

1973 01 09 17 07 55.5 51.41 178.21 

1973 01 10 17 13 08.7 55.22 159.94 

1973 01 13 01 00 37.6 51.77 177.00 

Mag Dep 

km 

4.7 76 

5.2 58 

4.6 33 

27 

4.7 64 

5.1 62 

4.9 62 

5.4 132 

3.2 30 

3.7 54 

4.1 98 

3.7 35 

5.1 129 

5.0 33 

5.5 50 

4.1 36 

4.4 64 

4.4 89 

45 

5.2 45 

5.5 57 

5.1 18 

5.1 52 

4.2 58 

5.4 61 

INTENSITY INFORMATION 

6 Obs. Location INT Locality 

km Lat 0 N Lon °W MM 

127 61.60 149.08 2 Palmer 

34 51.86 176.66 4 Adak 

64.50 165.41 4 Nome 

41 62.66 160.20 5 Anvik 

32 64.86 147.80 4 College 

55 51.86 176.66 4 Adak 

95 51.86 176.66 4 Adak 

91 51.86 176.66 3 Adak 

55.04 162.31 5 King Cove 

99 63.33 149.13 4 Summit 

103 62.33 150.11 4 Talkeetna 

109 63.38 148.95 3 Cantwell 

201 61.60 149.08 3 Palmer 

225 61.21 149.89 3 Anchorage 

62.66 160.20 3 Anvik 

34 61.21 149.89 3 Anchorage 

46 61.58 149.50 3 Wasilla 

55.04 162.31 2 King Cove 

62 51.86 176.66 3 Adak 

51.86 176.66 1 Adak 

33 64.85 147.71 3 Fairbanks 

85 53.15 168.33 3 Umnak Island 

95 52.94 168.86 3 Nikolski 

451 55.18 162.50 3 Cold Bay 

114 57.06 135.50 3 Sitka 

181 56.81 132.95 3 Petersburg 

45 52.72 174.11E 5 Shemya 

41 65.57 144.90 4 Central 

70 65.83 144.18 4 Circle 

80 65.05 146.06 4 Chena Hot Springs 

93 66.57 145.30 4 Fort Yukon 

138 64.85 147.71 4 Fairbanks 

91 51.86 176.66 2 Adak 

57.06 135.50 1 Sitka 

18 60.58 151.31 2 Kenai 

34 60.48 151.05 2 Soldotna 

56 60.24 151.38 2 Clam Gulch 

30 61.21 149.89 2 Anchorage 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

17 51.41 179.23E 4 Amchitka 

34 51.86 176.66 6 Adak 

51.86 176.66 1 Adak 

51.86 176.66 3 Adak 

30 60.55 145.75 3 Cordova 

118 51.86 176.66 2 Adak 

152 55.04 162.31 2 King Cove 

25 51.86 176.66 5 Adak 

Table 1-Earthquakes and Intensity Data 91 
IEq. 

No. 

2512 

2513 

2514 

2515 

2516 

2517 

2518 

2519 

2520 

2521 

2522 

2523 

2524 

2525 

2526 

2527 

2528 

2529 

2530 

2531 

2532 

2533 

2534 

2535 

2536 

2537 

2538 

2 539 

2540 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

541 

542 

543 

544 

545 

546 

547 

548 

549 

550 

551 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1973 01 13 13 36 28.3 51.74 176.98 

1973 01 15 10 34 33.5 

1973 01 16 09 57 38.6 54.12 165.54 

1973 01 17 07 46 11.2 

1973 01 17 17 48 07.2 ' 52.36 175.92 

1973 02 01 17 24 00.9 51.79 176.26E 

1973 02 07 18 52 23.1 61.26 150.48 

1973 02 08 15 00 48.9 61.76 150.18 

1973 02 13 19 53 53.5 51.25 179.22 

1973 03 06 06 09 19.1 

1973 03 11 01 17 22.5 64.83 147.81 

1973 03 11 08 03 53.8 56.91 136.43 

1973 03 19 11 41 07.7 52.84 173.77E 

1973 03 20 11 14 48.7 61.63 150.89 

197S OS 21 05 40 37.9 64.84 147 .8S 

197S 03 22 20 58 36 51.18 179.24E 

1973 OS 23 06 55 SS.1 51.SO 174.22E 

197S OS 26 21 47 5S.7 52.82 17S.82E 

197S OS 27 12 S2 05 52.58 172.87E 

197S OS 28 07 26 S3.9 64.77 147.54 

197S 04 02 16 49 29.S 51.94 177.40 

197S 04 05 09 30 38.S 51.98 176.01 

197S 04 06 01 46 18.2 51.42 178.44 

1973 04 06 05 22 57.3 61.23 149.47 

197S 04 11 05 12 18.1 64.61 160.05 

197S 04 11 18 59 53.4 

197S 04 16 14 48 02.8 51.12 178.8S 

197S 04 22 21 42 16.1 51.13 179.84 

197S 04 27 21 02 16.6 

1973 04 so 11 55 29.2 60.95 151.1S 

197S 04 so 23 32 S6 51.60 177.79E 

197S 05 06 08 05 

197S 05 10 11 39 31.5 51.37 179.52 

197S 05 15 15 21 27.2 

1973 05 18 18 S2 55.7 63.07 150.95 

197S 05 20 04 01 

197S 05 20 04 05 

197S 05 20 04 53 

197S 05 20 14 20 S3.7 51.70 176.68 

197S 05 20 18 18 18 60.97 152.44 

92 U.S. Geological Survey Bulletin 1840 

Mag Dep 

km 

4.7 58 

5.3 81 

3.9 123 

5.3 51 

3.6 45 

3.8 54 

5.4 46 

3.0 19 

33 

5.8 81 

81 

18 

4.9 40 

5.8 27 

5.0 102 

5.6 4S 

S.3 21 

5.2 63 

3.9 59 

5.0 50 

3.8 39 

4.2 15 

4.6 

5.5 54 

4.8 54 

3.4 ss 

4.8 61 

5.3 61 

4.2 

4.7 128 

4.6 56 

4.9 118 

INTENSITY INFORMATION 

1:1 Obs. Location INT Locality 

km Lat 0 N Lon °W MM 

26 51.86 176.66 4 Adak 

51.86 176.66 2 Adak 

64 54.56 164.90 3 Cape Sarichef 

256 52.94 168.86 2 Nikolski 

51.86 176.66 2 Adak 

75 51.86 176.66 1 Adak 

180 52.72 174.11E 2 Shemya 

32 61.21 149.89 2 Anchorage 

3 Whites Crossing 

7 61.70 150.13 3 Willow 

190 51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

5 64.85 147.71 3 Fairbanks 

59 57.06 135.50 2 Sitka 

27 52.72 174.11E 5 Shemya 

96 61.60 149.08 2 Palmer 

6 64.85 147.71 s Fairbanks 

392 52.72 174.11E 4 Shemya 

194 51.86 176.66 2 Adak 

158 52.72 174.11E s Shemya 

23 52.72 174.11E 2 Shemya 

85 52.72 174.11E 5 Shemya 

48 52.94 173.25E 3 Attu 

16 64.86 147.80 4 ColJege-Fairbanks Area 

52 51.86 176.66 4 Adak 

47 51.~6 176.66 2 Adak 

133 51.86 176.66 2 Adak 

23 61.21 149.89 2 Anchorage 

35 61.49 149.09 2 Goat Creek 

46 61.60 149.08 2 Palmer 

149 64.74 156.94 5 Galena Airport 

92 63.86 160.83 4 Unalakleet 

51.86 176.66 2 Adak 

172 51.86 176.66 4 Adak 

53 51.41 179.23E s Amchitka 

64.86 147.80 2 College 

73 61.21 149.89 s Anchorage 

99 60.75 149.36 3 Silvertip 

102 51.41 179.23E 3 Amchitka 

52.72 174.11E 4 Shemya 

21 51.41 179.23E s Amchitka 

51.86 176.66 2 Adak 

96 63.33 149.13 2 Summit 

52.72 174.11E s Shemya 

52.72 174.11E s Shemya 

52.72 174.11E s Shemya 

18 51.86 176.66 4 Adak 

140 61.21 149.89 2 Anchorage 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~~- Date Time Epicenter Mag Dep 6 Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

2551 1973 05 20 18 18 18 60.97 152.44 4.9 118 193 61.60 149.08 2 Palmer 

2552 1973 05 24 18 47 11.6 51.63 173.44 5.4 43 224 51.86 176.66 4 Adak 

91 52.12 174.50 2 Atka Island 

2553 1973 05 26 03 06 53.5 51.73 175.42 4.6 59 87 51.86 176.66 2 Adak 

2554 1973 05 26 12 19 34.4 51.37 179.74 5.8 39 220 51.86 176.66 5 Adak 

36 51.41 179.23E s Amchitka 

2555 1973 05 26 23 04 38 60.16 153.96 4.4 171 251 61.21 149.89 2 Anchorage 

310 61.60 149.08 2 Palmer 

2556 1973 05 29 06 14 22.3 54.01 163.76 6.0 30 154 55.18 162.50 5 Cold Bay 

96 54.56 164.90 s Cape Sarichef 

2557 1973 05 31 15 23 53.9 4.3 51.86 176.66 1 Adak 

2558 1973 06 01 04 52 44.6 65.06 147.26 3.6 32 32 64.85 147.71 5 Fairbanks 

2559 1973 06 12 01 18 25.2 51.86 176.66 2 Adak 

2560 1973 06 15 12 11 02.3 51.30 179.39 5.8 48 199 51.86 176.66 4 Adak 

2561 1973 06 15 13 38 23.1 51.27 179.42 5.4 50 202 51.86 176.66 3 Adak 

2562 1973 06 18 01 49 05.4 65.14 147.02 4.0 29 48 64.86 147.80 4 College 

46 64.85 147.71 s Fairbanks 

2563 1973 06 19 16 13 13.3 64.79 14 7.55 3.8 26 14 64.86 147.80 4 College 

10 64.85 147.71 s Fairbanks 

2564 1973 06 23 05 26 49 51.88 176.90 5.5 62 17 51.86 176.66 5 Adak 

2565 1973 06 23 15 00 50 64.86 147.47 22 16 64.86 147.80 4 College 

2566 1973 06 25 04 36 59.8 61.67 150.06 3.4 15 375 64.23 145.25 s Anchorage Hwy (mi 60.5) 

2567 1973 06 26 05 35 17 52.24 174.11E 4.9 41 53 52.72 174.11E 2 Shemya 

2568 1973 06 30 17 55 55.9 52.75 172.26E 5.4 44 125 52.72 174.11E s Shemya 

2569 1973 07 01 13 33 34.6 57.84 137 .ss 6.1 ss 109 58.41 135.83 5 Gustavus 

11.7 58.10 135.41 5 Hoonah 

140 57.06 135.50 5 Sitka 

180 58.30 134.41 5 Juneau 

239 59.55 139.81 5 Yakutat 

126 57.77 135.21 4 Tenakee Springs 

2570 1973 07 01 15 12 05 57.78 137.29 5.2 33 134 57.06 135.50 3 Sitka-Juneau 

2571 1973 07 03 16 59 35.1 57.98 138.02 6.0 ss 137 58.41 135.83 5 Gustavus 

203 59.55 139.81 4 Yakutat 

216 58.30 134.41 4 Juneau 

182 57.06 135.50 s Sitka 

2572 1973 07 04 19 54 30.7 64.77 14 7.53 3.2 6 12 64.85 147.71 s Fairbanks 

2573 1973 07 05 07 49 04.5 57.91 137.90 5.4 33 134 58.41 135.83 4 Gustavus 

172 57.06 135.50 4 Sitka 

2574 1973 07 08 13 47 58.21 136.65 s Cape Spencer 

58.30 134.41 s Juneau 

2575 1973 07 11 23 23 11.7 51.97 176.10 5.1 63 40 51.86 176.66 4 Adak 

2576 1973 07 12 07 51 07.9 52.22 174.21E 5.2 47 56 52.72 174.11E 5 Shemya 

2577 1973 07 15 05 53 27.7 61.57 150.30 3.1 65 61.60 149.08 1 Palmer 

2578 1973 07 18 07 30 22.2 57.06 135.50 2 Sitka 

2 579 1973 08 06 11 19 10 51.53 178.05 4.6 55 103 51.86 176.66 2 Adak 

2580 1973 08 16 12 16 59.8 51.29 176.64 5.6 47 63 51.86 176.66 4 Adak 

2581 1973 08 16 12 36 28.6 51.30 176.64 5.2 48 62 51.86 176.66 s Adak 

2582 1913 08 16 14 25 34.4 51.45 176.63 5.6 62 46 51.86 176.66 s Adak 

2583 1973 08 17 10 08 10 51.38 176.61 4.9 51 54 51.86 176.66 2 Adak 

Table 1-Earthquakes and Intensity Data 93 
I:Eq. 

No. 

2584 

2585 

2586 

2587 

2588 

2589 

2590 

2591 

2592 

2593 

2594 

2595 

2596 

2597 

2598 

2599 

2600 

2601 

2602 

2603 

2604 

2605 

2606 

2607 

2608 

2609 

2610 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

611 

612 

613 

614 

615 

616 

617 

618 

619 

620 

621 

622 

623 

624 

EARTHQUAKE PARAMETERS 

Dat.e Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1973 08 22 08 02 14.5 62.62 149.25 

1973 08 22 18 14 37.2 57.07 154.10 

1973 08 26 21 47 12 51.25 179.26 

1973 08 27 00 07 26.5 51.46 178.39 

1973 08 27 01 58 08.3 51.31 175.94 

1973 08 27 04 37 05.4 51.70 173.69 

1973 08 28 03 22 14.7 

1973 08 31 02 30 57.9 61.10 147.41 

1973 09 06 10 59 36.7 61.04 146.83 

1973 09 08 01 13 52.2 51.30 179.23 

1973 09 11 22 54 33.5 

1973 09 14 07 01 31.4 

1973 09 20 07 30 20.3 

1973 10 05 09 22 06.3 66.31 157.37 

1973 10 05 19 52 53.8 

1973 10 08 02 36 22.3 

1973 11 01 16 50 22 62.00 150.62 

1973 11 02 08 30 

1973 11 02 17 35 

1973 11 06 09 18 24 

1973 11 06 09 36 05 51.62 175.40 

1973 11 06 09 50 59.7 

1973 11 06 10 07 55.5 61.62 150.02 

1973 11 06 18 26 35.1 51.58 175.25 

1973 11 06 18 39 47.5 51.79 175.31 

1973 11 07 04 44 59.5 52.61 175.09 

1973 11 07 13 44 30.7 

1973 11 08 07 27 49.8 

1973 11 08 22 39 34.8 51.09 175.18 

1973 11 09 06 22 47.7 

~973 11 09 21 35 22.4 61.85 150.59 

1973 11 11 17 03 

1973 11 26 12 56 01.3 

1973 11 27 11 06 46.8 51.26 175.96 

1973 12 03 19 18 41 

1973 12 09 17 41 29.1 51.36 179.14 

1973 12 09 17 48 17.1 58.40 151.85 

1973 12 13 11 40 35.5 64.76 148.02 

1973 12 14 03 44 43.7 51.32 178.30 

1973 12 14 05 36 30.8 

1973 12 14 17 37 35.4 51.41 177.87 

94 U.S. Geological Survey Bulletin 1840 

Mag Dep 

km 

3.6 83 

5.9 38 

5.2 48 

5.2 59 

4.7 40 

4.8 45 

5.1 49 

5.5 29 

4.9 54 

4.1 68 

4.4 

4.4 

3.9 69 

3.5 

5.8 34 

4.5 

52 

5.9 41 

4.5 49 

4.6 162 

4.5 

162 

3.9 16 

60 

4.5 

3.9 19 

4.4 

4.8 48 

4.2 39 

11 

5.2 54 

5.8 53 

INTENSITY INFORMATION 

~ Obs. Location INT Locality 

krn Lat 0 N Lon ow MM 

114 61.60 149.08 3 Palmer 

53 57.33 153.36 3 Kodiak Island 

193 51.86 176.66 3 Adak 

128 51.86 176.66 4 Adak 

79 51.86 176.66 2 Adak 

206 51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

134 61.21 149.89 3 Anchorage 

61 61.11 146.28 1 Valdez 

105 61.60 149.08 1 Palmer 

109 60.55 145.75 1 Cordova 

155 60.11 149.41 1 Seward 

31 61.11 146.28 3 Valdez 

166 61.21 149.89 3 Anchorage 

189 51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

51.86 176.66 3 Adak 

77 66.22 155.67 4 Hogatza 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

30 61.96 151.18 4 Skwentna 

52.12 174.50 4 Atka Island 

52.12 174.50 4 Atka Island 

51.86 176.66 1 Adak 

91 51.86 176.66 4 Adak 

51.86 176.66 2 Adak 

46 61.21 149.89 3 Anchorage 

102 51.86 176.66 4 Adak 

93 51.86 176.66 3 Adak 

136 51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

134 51.86 176.66 1 Adak 

51.86 176.66 3 Adak 

80 61.21 149.89 1 Anchorage 

84 61.60 149.08 1 Palmer 

59.63 151.55 4 Homer 

51.86 176.66 2 Adak 

83 51.86 176.66 4 Adak 

51.86 176.66 2 Adak 

181 51.86 176.66 2 Adak 

149 57.33 153.36 3 Kodiak Island 

18 64.85 147.71 2 Fairbanks 

129 51.86 176.66 3 Adak 

51.86 176.66 2 Adak 

98 51.86 176.66 5 Adak 
~Eq. No. 

2625 

2626 

2627 

2628 

2629 

2630 

2631 

2632 

2633 

2634 

2635 

2636 

2637 

2638 

2639 

2640 

2641 

2642 

2643 

2644 

2 645 

2646 

2 

2 

2 

2 

2 

647 

648 

649 

650 

651 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1973 12 17 07 11 24.8 

1974 01 01 04 29 16.8 

1974 01 07 17 47 03 64.88 14 7.56 

1974 01 08 17 17 47.6 

1974 01 24 18 43 26.8 61.59 147.63 

1974 01 25 01 00 21.3 61.53 14 7.60 

1974 01 31 15 09 27.7 61.93 148.67 

1974 02 01 09 02 17.7 62.14 147.83 

1974 02 02 14 36 02.1 61.46 147.47 

1974 02 02 15 55 28.3 61.60 147.60 

1974 02 05 02 25 22 62.70 148.85 

1974 02 06 04 04 07.2 53.80 164.67 

1974 02 16 17 52 52 51.26 179.29 

1974 02 17 00 54 42.3 

1974 03 09 14 18 52.3 61.40 149.62 

1974 03 10 00 12 40.4 50.53 175.11 

1974 03 10 10 00 14.1 63.16 150.50 

1974 03 25 09 29 47.6 

1974 03 26 16 56 34 64.89 150.99 

1974 03 29 21 50 35.3 57.59 153.92 

1974 03 31 15 34 24.7 51.71177.29 

1974 04 06 01 53 47.3 55.10 160.44 

1974 04 06 02 27 21.8 55.34 160.60 

1974 04 06 03 56 01.8 55.12 160.44 

1974 04 06 13 27 36.4 

1974 04 06 15 13 32.2 

1974 04 14 03 30 

Mag Dep 

km 

4.3 

10 

4.8 40 

28 

66 

3.5 63 

3.8 69 

5.1 48 

5.0 75 

5.9 2 

4.2 33 

42 

4.7 28 

4.5 117 

33 

5.7 44 

4.4 61 

5.7 27 

4.3 33 

6.0 40 

INTENSITY INFORMATION 

l:l Obs. Location INT Locality 

km Lat 0 N Lon °W MM 

51.86 176.66 2 Adak 

51.86 176.66 3 Adak 

8 64.85 147.71 2 Fairbanks 

51.86 176.66 2 Adak 

27 61.83 147.52 5 Sheep Mountain Lodge 

77 61.60 149.08 4 Palmer 

124 62.11 145.55 4 Glennallen 

128 61.21 149.89 4 Anchorage 

90 61.11 146.28 3 Valdez 

70 61.71 148.86 2 Sutton 

43 61.60 149.08 2 Palmer 

89 61.60 149.08 2 Palmer 

87 61.60 149.08 2 Palmer 

109 61.58 149.50 2 Wasilla 

132 61.21 149.89 2 Anchorage 

78 61.60 149.08 2 Palmer 

130 61.21 149.89 2 Anchorage 

69 63.26 149.45 5 Gold Creek 

58 63.15 149.43 4 Colorado 

94 62.08 150.07 4 Montana 

130 61.63 149.84 4 Houston 

123 61.60 149.08 3 Palmer 

175 61.21 149.89 3 Anchorage 

246 64.85 147.71 3 Fairbanks 

208 55.18 162.50 5 CoJd Bay 

86 54.56 164.90 3 Cape Sarichef 

145 53.58 166.83 2 Unalaska Island 

194 51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

21 61.58 149.50 2 Wasilla 

183 51.86 176.66 2 Adak 

54 63.26 149.45 2 Gold Creek 

51.86 176.66 2 Adak 

21 65.00 150.63 2 Manley Hot Springs 

96 57.78 152.35 5 Woody Island 

87 57.75 152.50 4 Kodiak 

464 61.21 149.89 2 Anchorage 

47 51.86 176.66 4 Adak 

26 55.33 160.51 5 Sand Point 

99 55.99 160.57 3 Port Moller 

132 55.18 162.50 3 Cold Bay 

6 55.33 160.51 2 Sand Point 

131 55.18 162.50 5 Cold Bay 

24 55.33 160.51 3 Sand Point 

97 55.99 160.57 3 Port Moller 

55.33 160.51 2 Sand Point 

55.18 162.50 2 Cold Bay 

55.99 160.57 2 Port Moller 

55.33 160.51 2 Sand Point 

55.99 160.57 4 Port Moller 

Table 1-Earthquakes and Intensity Data 95 
I:Eq. 

No. 

2652 

2653 

2654 

2655 

2656 

2657 

2658 

2659 

2660 

2661 

2662 

2663 

2664 

2665 

2666 

2667 

2668 

2669 

2670 

2671 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

672 

673 

674 

675 

676 

677 

678 

679 

680 

681 

682 

683 

684 

685 

686 

687 

EARTHQUAKEPARAMETERB 

Date Time Epicent.er 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1974 04 15 16 27 35.5 59.19 136.43 

1974 04 18 21 54 26.4 59.16 139.97 

1974 04 22 02 29 40.1 51.99 176.06 

1974 04 25 10 16 15.3 

1974 04 26 01 07 08.7 51.76 176.75 

1974 04 28 16 27 39.8 61.67 149.02 

1974 05 08 04 27 13.1 63.67 150.73 

1974 05 11 04 17 34.7 61.66 150.59 

1974 05 13 16 50 

1974 05 21 23 31 41.2 63 .. 31 151.25 

1974 05 26 15 52 50.6 62.93 148.23 

1974 05 26 18 13 58.6 61.57 150.24 

1974 05 27 14 01 43.5 60.33 146.02 

1974 05 28 08 21 59.4 60.61 149.78 

1974 06 04 08 13 12.6 

1974 06 06 10 53 08.2 52.02 175.40 

1974 06 11 20 20 44.9 51.92 173.53 

1974 06 15 11 47 20.1' 

1974 06 22 20 35 37 51.25 178.24 

1974 06 27 23 21 51.7 

1974 07 06 05 06 50.1 

1974 07 13 12 44 50.7 61.49 145.01 

1974 07 13 14 48 50 62.23 151.22 

1974 07 29 11 37 44 59.71 152.73 

1974 07 31 09 20 51.6 60.53 150.05 

1974 08 06 02 37 42.3 60.25 153.32 

1974 08 11 12 57 48.1 66.02 165.51 

1974 08 13 03 46 20.3 51.53 178.11 

1974 08 14 05 34 54.4 51.56 178.15 

1974 08 16 09 41 31.7 51.50 177.83 

1974 08 20 20 45 01.4 52.24 174.97E 

1974 08 22 01 30 

1974 08 22 03 58 31.6 51.42 176.32 

1974 08 24 18 16 56 51.66 178.62 

1974 08 26 17 14 57.9 

1974 08 26 19 44 32.7 

96 U.S. Geological Survey Bulletin 1840 

Mag Dep 

km 

4.2 7 

3.9 28 

4.9 70 

4.7 64 

32 

4.6 11 

3.8 67 

4.2 12 

88 

3 

5.5 21 

3.4 27 

4.1 62 

4.8 58 

4.5 49 

4.7 55 

4.4 85 

4.5 84 

4.3 44 

5.0 136 

4.1 33 

5.8 52 

5.7 56 

5.7 46 

5.6 58 

4.1 44 

4.0 66 

INTENSITY INFORMATION 

fl. Obs. Location INT Locality 

km Lat 0 N Lon °W MM 

60 59.18 135.38 4 Haines 

44 59.55 139.81 2 Yakutat 

44 51.86 176.66 4 Adak 

51.86 176.66 3 Adak 

13 51.86 176.66 2 Adak 

8 61.60 149.08 2 Palmer 

27 61.58 149.50 2 Wasilla 

197 64.85 147.71 4 Fairbanks 

63 61.21 149.89 2 Anchorage 

188 63.26 149.45 2 Gold Creek 

64.86 147.80 3 College 

221 61.60 149.08 2 Palmer 

169 61.70 150.13 2 Willow 

16 61.70 150.13 2 Willow 

10 60.40 146.13 3 Boswell Bay 

29 60.55 145.75 3 Cordova 

232 61.21 149.89 2 Anchorage 

59 60.11 149.41 2 Seward 

67 61.21 149.89 2 Anchorage 

51.86 176.66 2 Adak 

88 51.86 176.66 2 Adak 

216 51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

129 51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

20 61.65 145.17 4 Ton sin a 

26 61.50 144.52 4 Chitina 

80 61.11 146.28 4 Valdez 

54 61.95 145.30 3 Copper Center 

75 62.11 145.55 3 Glennallen 

59 62.33 150.11 5 Talkeetna 

74 61.85 150.06 4 Kashwitna 

67 59.63 151.55 5 Homer 

130 59.63 151.55 4 Homer 

76 61.21 149.89 3 Anchorage 

121 59.63 151.55 4 Homer 

215 61.21 149.89 3 Anchorage 

133 65.00 164.00 2 Seward Peninsula 

107 51.86 176.66 5 Adak 

108 51.86 176.66 2 Adak 

240 52.12 174.50 4 Atka Island 

79 52.72 174.11E 3 Shemya 

3 Grand Centra] River 

54 51.86 176.66 2 Adak 

137 51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

51.86 176.66 2 Adak 
~~- No. 

2688 

2689 

2690 

2691 

2692 

2693 

2694 

2695 

2696 

2697 

2698 

2699 

2700 

2701 

2702 

2703 

2704 

2705 

2706 

2707 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

708 

709 

710 

711 

712 

713 

714 

715 

716 

717 

718 

719 

720 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1974 08 27 19 24 55 51.94 178.84 

1974 08 28 02 33 40 

1974 09 10 05 26 19.3 59.90 151.71 

1974 09 11 10 56 48.4 60.27 151.04 

1974 09 24 12 40 51.1 

1974 09 27 03 36 25.7 61.58 149.95 

1974 09 28 02 51 54 64.48 147.73 

1974 10 03 11 30 08.5 

1974 10 09 16 00 04.7 

1974 10 13 15 26 14.4 61.43 148.02 

1974 10 14 01 20 

1974 11 04 23 32 

1974 11 07 18 45 41.1 52.61 17 4.01 

1974 11 07 20 19 

1974 11 11 01 20 01.4 

1974 11 11 05 17 51 51.63 178.11 

1974 11 14 04 48 54.7 58.80 154.62 

1974 11 15 05 43 43 58.84 154.45 

1974 11 15 14 18 54 

1974 11 28 05 28 48.2 51.87 175.27 

1974 11 28 08 28 00.1 

1974 11 28 18 27 02.8 61.63 148.35 

1974 11 30 12 57 20.6 53.27 172.96 

1974 11 31 02 51 58.1 51.56 176.75 

1974 12 10 15 00 58 64.75 149.05 

1974 12 22 05 32 12.3 51.44 178.52 

1974 12 25 02 49 13 51.70 174.64E 

1974 12 28 22 03 33.6 

1974 12 29 18 25 00.7 61.60 150.51 

1974 12 30 03 33 16.6 61.98 149.69 

1975 01 01 03 55 12 61.91149.74 

1975 01 01 21 15 54.8 61.41 150.06 

1975 01 08 17 38 19.1 52.40 175.55 

!Mag Dep 

km 

4.4 36 

3.7 86 

4.3 33 

3.7 72 

3.6 30 

51 

4.5 21 

5.8 68 

5.5 37 

3.8 60 

5.2 63 

12 

5.2 17 

55 

61 

4.6 55 

5.7 40 

5.6 67 

5.1 62 

5.9 66 

3.8 63 

5.1 114 

INTENSITY INFORMATION 

/:). Obs. Location INT Locality 

km Lat 0 N Lon °W ~M 

150 51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

96 60.00 150.00 5 Kenai Peninsula 

31 59.63 151.55 3 Homer 

18 60.35 151.33 5 Cohoe 

51.86 176.66 2 Adak 

3 Kashwitna-Willow 

41 61.21 149.89 2 Anchorage 

46 61.60 149.08 2 Palmer 

42 64.86 147.80 4 College Observatory 

51.86 176.66 2 Adak 

64.85 147.71 4 Fairbanks 

382 64.85 147.71 4 Fairbanks 

64.85 147.71 4 Fairbanks 

64.86 147.80 3 College 

64.85 147.71 3 Fairbanks 

14 52.72 174.11E 4 Shemya 

52.72 174.11E 4 Shemya 

64.86 147.80 2 College 

103 51.86 176.66 5 Adak 

107 59.75 154.92 4 Uiamna 

58 58.65 153.66 3 King Salmon-Homer 

181 59.48 151.75 3 Seldovia 

129 58.67 156.66 5 King Salmon 

51.86 176.66 2 Adak 

96 51.86 176.66 4 Adak 

51.86 176.66 2 Adak 

39 61.60 149.08 2 Palmer 

42 52.94 173.25E 4 Attu 

34 51.86 176.66 2 Adak 

65 64.85 147.71 4 Fairbanks 

137 51.86 176.66 2 Adak 

119 52.72 174.11E 4 Shemya 

51.86 176.66 3 Adak -

54 61.58 149.50 5 Wasilla 

53 61.23 149.90 5 Elmendorf AFB 

79 61.01 151.33 5 Tyonek 

84 62.33 150.11 5 Talkeetna 

76 61.60 149.08 4 Palmer 

55 61.21 149.89 3 Anchorage 

53 61.60 149.08 5 Palmer 

86 61.21 149.89 5 Anchorage 

45 62.33 150.11 3 Talkeetna 

49 61.60 149.08 5 Palmer 

78 61.21 149.89 5 Anchorage 

24 61.21 149.89 3 Anchorage 

35 61.58 149.50 3 Wasilla 

56 61.60 149.08 3 Palmer 

97 51.86 176.66 3 Adak 

Table 1-Earthquakes and Intensity Data 97 
~Eq. No. 

2721 

2722 

2723 

2724 

2725 

2726 

2727 

2728 

2729 

2730 

2731 

2732 

2733 

2734 

2735 

2736 

2737 

2738 

2739 

2740 

2741 

2742 

2743 

2744 

2745 

2746 

2747 

2748 

2749 

2750 

2751 

2 

2 

2 

752 

753 

754 

EARTHQUAKE PARAMETERS 

Dat.e Time Epicent.er 

Yr Mo Dy Hr Mn Sec Lat. 0 N Lon °W 

1975 01 10 20 40 39.6 51.59 178.46 

1975 01 13 00 31 55.6 61.43 150.49 

1975 01 16 14 05 48.8 62.90 148.31 

1975 01 22 23 20 41.2 

1975 01 24 11 07 09.8 64.80 147.41 

1975 01 24 22 43 00.2 51.81 175.31 

1975 01 26 01 12 17.7 61.75 149.70 

1975 01 27 00 23 09.7 61.28 149.81 

1975 01 27 21 33 32.2 52.49 176.19 

1975 01 28 07 25 01.2 61.35 149.97 

1975 01 31 02 27 37.2 52.92 168.47 

1975 02 02 06 55 

1975 02 02 07 24 53.3 53.05 173.45E 

1975 02 02 08 43 39.1 53.11 173.50E 

1975 02 02 11 50 02.3 

1975 02 02 15 19 48.4 51.81 175.40 

1975 02 02 15 38 

1975 02 02 15 53 06.9 52.94 173.56E 

1975 02 05 03 56 

1975 02 07 10 22 46.2 52.40 174.24E 

1975 02 09 11 01 19.4 52.82 174.49E 

1975 02 10 10 05 38.0 60.70 147.00 

1975 02 12 15 45 35.1 63.52 148.73 

1975 02 15 07 51 15.6 51.84 175.26 

1975 02 15 17 53 57.7 

1975 02 21 22 51 17.0 

1975 02 22 08 36 07.4 51.38 179.42 

1975 02 23 01 56 35.0 

1975 02 23 05 09 43.3 51.27 179.27 

1975 03 04 11 09 45.2 

1975 04 02 14 43 21.9 51.62 178.29 

1975 04 05 13 43 50.1 

1975 04 06 06 16 07.8 

1975 04 07 22 13 46.1 61.56 150.57 

98 U.S. Geological Survey Bulletin 1840 

Mag Dep 

km 

4.9 63 

4.8 66 

33 

22 

4.6 56 

28 

3.9 46 

4.9 150 

3.7 42 

4.2 59 

5.9 25 

6.1 10 

4.1 56 

4.9 31 

4.4 33 

5.4 14 

4.3 33 

4.0 33 

4.4 49 

5.0 50 

4.9 62 

3.6 11 

INTENSITY INFORMATION 

ll Obs. Locat.ion INT Locality 

km Lat. 0 N Lon °W MM 

128 51.86 176.66 2 Adak 

65 61.01 151.33 5 f'yonek 

70 60.91 149.75 5 Hope 

40 61.21 149.89 4 Anchorage 

77 61.60 149.08 4 Palmer 

55 61.58 149.50 2 Wasilla 

209 59.63 151.55 2 Homer 

65 62.89 149.59 2 Chulitna 

150 61.60 149.08 2 Palmer 

51.86 176.66 2 Adak 

15 64.85 147.71 2 Fairbanks 

93 51.86 176.66 4 Adak 

2 Palmer Area 

9 61.21 149.89 3 Anchorage 

37 61.58 149.50 3 Wasilla 

53 61.60 149.08 3 Palmer 

77 51.86 176.66 2 Adak 

16 61.21 149.89 3 Anchorage 

26 61.42 149.50 3 Chugiak 

55 61.60 149.08 3 Palmer 

26 52.94 168.86 2 Nikolski 

52.94 173.25E 2 Attu 

58 52.72 174.11E 2 Shemya 

255 51.86 176.66 2 Adak 

60 52.72 174.11E 9 Shemya 

25 52.94 173.25E 5 Attu 

52.72 174.11E 4 Shemya 

87 51.86 176.66 2 Adak 

52.94 173.25E 4 Attu 

44 52.72 174.11E 2 Shemya 

52.72 174.11E 4 Shemya 

37 52.72 174.11E 5 Shemya 

28 52.72 174.11E 5 Shemya 

150 61.60 149.08 2 Palmer 

166 61.21 149.89 2 Anchorage 

19 63.38 148.95 4 Cantwell 

37 63.83 149.02 3 Healy 

156 64.85 147.71 3 Fairbanks 

96 51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

64.86 147.80 2 College Observatory 

198 51.86 176.66 6 Adak 

51.86 176.66 2 Adak 

193 51.86 176.66 2 Adak 

51.86 176.66 2 Adak 

116 51.86 176.66 3 Adak 

51.86 176.66 2 Adak 

57.06 135.50 2 Sitka 

39 61.63 149.84 2 Houston 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~Eq. Date Tim to Epinmter Mag D~p 6 Ob~. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec La.t 0 N Lon °W km km Lat 0 N Lon °W MM 

2754 1975 04 07 22 13 46.1 61.56 150.57 3.6 11 55 61.18 149.91 2 Spenard 

2755 1975 04 09 14 19 42.1 65.84 149.89 150 64.85 147.71 2 Fairbanks 

2756 1975 04 11 10 47 15.3 54.10 163.25 5.5 20 130 55.18 162.50 4 Cold Bay 

2757 1975 04 12 10 43 33.1 51.53 177.75 84 51.86 176.66 4 Adak 

2758 1975 04 12 14 05 31.5 61.92 150.31 2 Palmer-Anchorage 

2759 1975 04 13 14 16 43.4 65.34 150.09 37 124 64.85 147.71 4 Fairbanks 

2760 1975 04 14 16 42 32.8 57.95 156.94 4.3 155 913 64.85 147.71 4 Fairbanks 

2761 1975 04 14 18 30 35.5 64.85 147.71 s Fairbanks 

2762 1975 04 16 09 01 39.7 64.93 148.71 29 48 64.85 147.71 4 Fairbanks 

49 64.58 149.33 4 Nenana 

2763 1975 04 16 23 51 64.86 147.80 3 College Observatory 

2764 1975 04 17 17 39 29.2 51.85 175.29 94 51.86 176.66 4 Adak 

2765 1975 04 18 08 52 32.6 61.81 150.56 3.5 41 82 61.60 149.08 s Palmer 

2766 1975 04 18 22 47 08.9 52.93 173.34E 4.6 33 6 52.94 173.25E s Attu 

2767 1975 04 20 00 13 55.3 64.85 147.71 s Fairbanks 

2768 1975 04 20 07 11 35.7 51.26 179.63 217 51.86 176.66 2 Adak 

2769 1975 04 20 07 so 38.8 51.32 179.56 210 51.86 176.66 2 Adak 

2770 1975 04 22 16 14 55.18 162.50 4 Cold Bay 

2771 1975 04 26 06 40 58.1 51.86 176.66 2 Adak 

2772 1975 04 29 23 25 04.0 64.85 147.71 4 Fairbanks 

2773 1975 05 12 23 51 25.0 51.57 176.22 4.3 55 44 51.86 176.66 4 Adak 

2774 1975 05 15 12 05 38.5 51.72 175.42 4.0 65 87 51.86 176.66 2 Adak 

2775 1975 05 16 07 57 47.5 54.09 163.09 5.4 9 88 54.86 163.40 5 False Pass 

117 55.04 162.31 4 King Cove 

127 55.18 162.50 4 Cold Bay 

129 54.56 164.90 4 Cape Sarichef 

227 53.88 166.53 2 Dutch Harbor 

247 53.98 166.85 2 Driftwood Bay 

2 776 1975 05 18 15 42 59.1 63.17 150.26 5.4 106 247 61.01 151.33 5 Tyonek 

59 63.33 149.13 4 Summit 

70 63.38 148.95 4 Cantwell 

94 62.33 150.11 4 Talkeetna 

96 63.83 149.02 4 Healy 

143 61.96 151.18 4 Skwentna 

164 64.58 149.33 4 Nenana 

212 64.83 148.15 4 Ester 

225 63.10 154.72 4 Medfra 

332 60.24 151.38 4 Clam Gulch 

182 61.58 149.50 s Wasilla 

185 61.60 149.08 s Palmer 

205 65.00 150.63 3 Manley Hot Springs 

219 61.21 149.89 3 Anchorage 

244 65.28 148.90 3 Hot Springs 

269 62.11 145.55 3 Glennallen 

132 63.90 152.36 2 Lake Minchumina 

164 61.70 150.13 2 Willow 

208 61.33 149.63 2 Eagle River 

225 64.85 147.71 2 Fairbanks 

280 60.75 148.80 2 Whittier 

309 61.11 146.28 2 Valdez 

388 59.77 151.87 2 Anchor Point 

Table 1-Earthquakes and Intensity Data 99 
I~ No. 

2777 

2778 

2779 

2780 

2781 

2782 

2783 

2784 

2785 

2786 

2787 

2788 

2789 

2790 

2791 

2792 

2793 

2794 

2795 

2796 

2797 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

798 

799 

800 

801 

802 

803 

804 

805 

806 

807 

808 

809 

810 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1975 05 21 06 34 54.9 60.18 147.58 

1975 06 04 20 35 56.8 51.94 179.58 

1975 06 11 05 14 08.2 62.17 149.64 

1975 07 08 20 57 22.7 51.55 178.29 

1975 07 14 18 09 31.7 60.70 151.28 

1975 07 25 10 40 25.0 55.06 160.38 

1975 08 02 10 18 17.9 53.39 161.49 

1975 08 21 22 19 21.1 60.36 151.19 

1975 09 08 23 19 02.2 61.53 146.24 

1975 09 21 21 05 

1975 09 2·9 07 46 33.4 51.55 177.87 

1975 09 30 08 28 12.2 51.71 179.45 

1975 10 22 15 27 04.0 61.69 149.88 

1975 10 23 23 11 31.6 61.73 150.12 

1975 10 28 06 40 59.0 61.42 152.42 

1975 10 30 12 36 11.5 51.36 179.35 

1975 11 06 01 06 42.1 51.87 176.23E 

1975 11 07 16 19 

1975 11 13 02 54 01.2 54.37 162.66 

1975 11 30 05 31 25.7 52.30 176.27 

1975 12 01 22 15 21.2 61.47 149.14 

1975 12 03 07 38 10.2 61.67 150.83 

1975 12 21 13 24 05.1 53.16 168.97 

1975 12 25 16 50 42.0 61.82 148.68 

1975 12 26 13 40 07.8 62.47 150.04 

1975 12 29 17 52 33.5 62.30 148.63 

1976 01 07 17 18 46.7 61.86 150.67 

1976 01 13 23 48 22.6 51.79 174.70 

1976 01 15 02 17 20.4 61.7 4 149.7.7 

1976 01 15 13 12 31.2 62.26 150.46 

1976 01 17 09 09 51.4 61.44 148.38 

1976 01 22 07 59 20 61.57 149.96 

1976 01 23 13 03 04.7 53.52 166.49 

1976 02 05 09 36 36.5 59.99 149.35 

100 U.S. Geological Survey Bulletin 1840 

Mag Dep 

km 

4.8 35 

4.5 75 

4.3 59 

5.0 57 

109 

5.8 17 

6.2 33 

4.9 67 

33 

4.2 49 

4.6 33 

61 

33 

4.5 132 

5.0 50 

5.4 61 

5.3 33 

4.8 99 

3.7 42 

78 

4.3 72 

25 

58 

71 

44 

3.9 33 

30 

3.3 33 

2.6 28 

59 

3.7 104 

5.2 35 

INTENSITY INFORMATION 

fl. Obs. Location INT Locality 

km Lat 0 N Lon °W MM 

109 59.43 146.33 2 Middleton Island 

170 61.21 149.89 2 Anchorage 

201 51.86 176.66 2 Adak 

70 61.60 149.08 2 Palmer 

108 61.21 149.89 2 Anchorage 

118 51.86 176.66 3 Adak 

105 60.00 150.00 2 Kenai Peninsula 

155 61.60 149.08 2 Palmer 

136 55.18 162.50 4 Cold Bay 

191 55.04 162.31 5 King Cove 

210 55.18 162.50 4 Cold Bay 

84 59.63 151.55 5 Homer 

47 61.11 146.28 2 Valdez 

64.85 147.71 4 Fairbanks 

90 51.86 176.66 3 Adak 

193 51.86 176.66 2 Adak 

5 61.69 149.98 4 Nancy 

44 61.60 149.08 4 Palmer 

53 61.21 149.89 4 Anchorage 

3 61.70 150.13 3 Willow 

57 61.60 149.08 3 Palmer 

137 61.21 149.89 3 Anchorage Area 

194 51.86 176.66 2 Adak 

173 52.72 174.11E 5 Shemya 

52.72 174.11E 3 Shemya 

91 55.18 162.50 5 Cold Bay 

56 51.86 176.66 3 Adak 

15 61.60 149.08 4 Palmer 

20 61.42 149.50 4 Chugiak 

23 61.58 149.50 4 Wasilla 

49 61.21 149.89 2 Anchorage 

72 61.21 149.89 2 Anchorage 

93 61.60 149.08 2 Palmer 

26 52.94 168.86 4 Nikolski 

16 61.71 148.86 2 Sutton 

16 62.33 150.11 4 Talkeetna 

93 63.26 149.45 3 Gold Creek 

77 62.33 150.11 4 Talkeetna 

89 61.60 149.08 3 Palmer 

135 51.86 176.66 2 Adak 

20 61.70 150.13 2 Willow 

20 62.33 150.11 4 Talkeetna 

41 61.60 149.08 2 Palmer 

12 61.68 149.98 2 Nancy Lake 

38 53.86 166.53 4 Unalaska 

40 53.88 166.53 4 Dutch Harbor 

14 60.11 149.41 5 Seward 

55 60.48 149.40 4 Moose Pass Area 

90 60.75 148.80 3 Whittier 
I~· No. 

2810 

2811 

2812 

2813 

2814 

2815 

2816 

2817 

2818 

2819 

2820 

2821 

2822 

2823 

2824 

2825 

2826 

2827 

2828 

2829 

2830 

2831 

2832 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

833 

834 

835 

836 

837 

838 

839 

840 

841 

842 

843 

844 

EARTHQUAKE PARAMETERS 

Date Time Epicent.er 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1976 02 05 09 36 36.5 59.99 149.35 

1976 02 18 08 00 58.6 51.57 178.68 

1976 02 19 10 28 33.5 52.50 179.52 

1976 02 22 07 21 25.8 51.73 176.87 

1976 02 28 09 43 58 51.56 178.54 

1976 03 08 02 28 47.7 51.34 178.04 

1976 03 13 14 33 42.5 63.50 148.67 

1976 03 13 15 18 57.8 63.51 148.70 

1976 03 21 17 20 27.9 60.87 149.69 

1976 03 25 07 49 33.6 57.01 153.71 

1976 03 26 14 40 14.2 63.60 14 7.65 

1976 04 11 07 36 

1976 04 14 04 16 16.3 62.15 150.26 

1976 04 17 06 08 44.5 64.90 148.31 

1976 04 25 10 12 09.4 64.79 14 7.67 

1976 04 27 11 26 57.5 64.81 147.49 

1976 04 27 11 34 20 64.73 147.58 

1976 04 27 11 39 20 64.73 147.58 

1976 05 08 11 25 36.3 61.62 151.52 

1976 05 09 00 09 50.7 59.86 153.07 

1976 05 11 16 46 15.8 61.49 146.97 

1976 05 26 17 38 22.2 57.97 153.30 

1976 06 01 16 30 55.5 64.70 147.80 

1976 06 10 08 57 59.6 51.52 176.54 

1976 06 14 12 39 39 51.47 176.85 

1976 06 24 13 36 59.2 61.97 150.90 

1976 07 05 18 25 17.7 51.30 179.14 

1976 07 05 18 28 28 51.33 179.16 

1976 07 15 08 09 47.4 62.70 149.83 

1976 07 22 14 so 17.7 51.49 177.86 

1976 07 30 13 54 32.2 61.33 147.45 

1976 08 11 20 43 45.5 51.70 175.42 

1976 08 16 05 11 38.9 51.50 178.38 

1976 08 16 10 11 33.3 51.49 178.05 

1976 08 22 02 01 47.4 60.22 153.30 

Mag Dep 

km 

5.2 35 

4.9 39 

4.9 212 

5.0 58 

4.8 32 

4.7 54 

3.9 22 

3.3 45 

59 

5.0 28 

4.1 33 

3.1 33 

4.0 33 

3.3 34 

3.8 33 

3.0 29 

3.0 29 

4.4 16 

4.7 38 

4.2 67 

4.5 33 

2.9 9 

4.5 58 

4.1 50 

4.8 73 

4.6 61 

5.2 54 

4.2 24 

4.9 58 

3.9 40 

4.6 33 

5.1 65 

4.8 55 

5.5 144 

INTENSITY INFORMATION 

l:l. Obs. Location INT Locality 

km Lnt 0 N Lon °W MM 

139 61.21 149.89 3 Anchorage 

180 61.60 149.08 2 Palmer 

143 51.86 176.66 4 Adak 

208 51.86 176.66 2 Adak 

20 51.86 176.66 4 Adak 

134 51.86 176.66 2 Adak 

112 51.86 176.66 3 Adak 

19 63.38 148.95 5 Cantwell 

30 63.33 149.13 5 Summit 

40 63.85 148.84 3 Suntrana 

42 63.23 149.27 3 Broad Pass 

19 63.38 148.95 3 Cantwell 

36 60.96 149.06 3 Alyeska 

39 61.21 149.89 3 Anchorage 

88 61.60 149.08 3 Palmer 

32 57.21 153.33 3 Old Harbor 

58 56.55 154.16 3 Sitkinak Island 

139 64.85 147.71 4 Fairbanks 

64.86 147.80 4 College 

22 62.33 150.11 4 Talkeetna 

29 64.85 147.71 5 Fairbanks 

49 64.74 147.35 2 North Pole 

7 64.85 147.71 5 Fairbanks 

11 64.85 147.71 4 Fairbanks 

15 64.85 147.71 5 Fairbanks 

15 64.85 147.71 3 Fairbanks 

116 60.58 151.31 4 Kenai 

108 62.33 150.11 2 Talkeetna 

89 59.63 151.55 4 Homer 

104 59.75 154.92 4 Iliamna 

56 61.11 146.28 3 Valdez 

71 57.33 153.36 3 Kodiak Island 

2 Central Alaska 

39 51.86 176.66 2 Adak 

45 51.86 176.66 s Adak 

57 62.33 150.11 s Talkeetna 

183 51.86 176.66 2 Adak 

183 51.86 176.66 2 Adak 

44 62.33 150.11 4 Talkeetna 

93 51.86 176.66 2 Adak 

67 61.11 146.28 2 Valdez 

87 51.86 176.66 s Adak 

126 51.86 176.66 2 Adak 

105 51.86 176.66 2 Adak 

89 60.06 151.73 6 Ninilchik 

117 60.58 151.31 6 Kenai 

90 60.00 154.86 5 Nondalton 

94 59.77 151.87 5 Anchor Point 

106 60.24 151.38 5 Clam Gulch 

Table 1-Earthquakes and Intensity Data 101 
1r~· No. 

2844 

2845 

2846 

2847 

2848 

2849 

2850 

2851 

2852 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

853 

854 

855 

856 

857 

858 

859 

860 

861 

862 

863 

864 

865 

866 

867 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1976 08 22 02 01 47.4 60.22 153.30 

1976 08 25 11 04 18.9 60.61 150.17 

1976 08 28 02 30 09.2 52.60 175.34 

1976 09 05 10 33 49 51.40 178.77 

1976 09 15 16 44 29.6 61.08 150.62 

1976 09 21 03 01 04.6 57.84 152.12 

1976 09 22 02 30 25.7 51.72 175.95 

1976 09 27 05 59 45.7 60.46 145.17 

1976 10 18 00 36 31.6 63.29 150.74 

1976 10 24 17 19 53.7 62.65 149.14 

1976 11 11 18 18 30.5 61.31 149.79 

1976 11 30 I 

06 22 35.3 59.92 153.36 

1976 12 15 09 51 32.3 61.35 150.25 

1976 12 15 13 35 53.8 64.83 14 7.87 

1977 01 03 01 34 34.2 51.43 179.08 

1977 01 06 16 02 07.6 51.48 175.48 

1977 01 13 22 05 59.3 59.43 142.23 

1977 01 18 17 07 10.8 61.39 146.56 

1977 01 25 17 12 19.1 60.98 149.99 

1977 01 26 21 38 45 61.23 150.13 

1977 01 30 03 02 50.6 51.57 175.53 

1977 02 19 22 34 04.1 53.57 170.03E 

1977 02 24 13 50 

1977 03 03 10 14 02.3 51.75 175.97 

102 U.S. Geological Survey Bulletin 1840 

Mag Dep 

km 

5.5 144 

47 

5.1 145 

4.4 68 

74 

4.9 33 

4.8 43 

4.0 41 

4.9 126 

4.9 75 

3.2 33 

4.7 127 

3.7 51 

3.0 31 

4.8 33 

5.2 38 

4.5 33 

3.2 28 

3.5 37 

52 

4.1 44 

6.2 33 

4.1 63 

INTENSITY INFORMATION 

6 Obs. Location INT Locality 

km Lat 0 N Lon ow MM 

109 60.38 151.35 5 Kasilof 

118 59.63 151.55 5 Homer 

128 59.35 151.82 5 Port Graham 

127 60.48 151.05 5 Soldotna 

144 60.54 150.76 5 Sterling 

216 61.21 149.89 5 Anchorage 

216 60.11 149.41 5 Seward 

256 61.58 149.50 5 Wasilla 

263 57.87 152.88 5 Port Lions 

120 59.48 151.75 4 Seldovia 

246 61.42 149.50 4 Chugiak 

259 57.93 152.50 4 Ouzinkie 

291 62.33 150.11 4 Talkeetna 

335 57.21 153.33 4 Old Harbor 

371 61.58 159.55 4 Aniak 

374 61.01 159.95 4 Nyac 

272 57.83 152.34 3 Mill Bay 

276 61.60 149.08 3 Palmer 

279 57.75 152.50 3 Kodiak 

3 Northern Kenai Peninsula 

69 61.21 149.89 3 Anchorage 

122 51.86 176.66 3 Adak 

155 51.86 176.66 2 Adak 

42 61.21 149.89 2 Anchorage 

25 57.75 152.50 3 Kodiak 

51 51.86 176.66 4 Adak 

33 60.55 145.75 3 Cordova 

68 63.15 149.43 4 Colorado 

90 63.38 148.95 4 Cantwell 

207 61.60 149.08 2 Palmer 

236 61.21 149.89 2 Anchorage 

3 South-Central Alaska 

2 Southern Alaska 

4 Kenai-Anchor Point Area 

107 59.63 151.55 3 Homer 

238 61.21 149.89 3 Anchorage 

25 61.21 149.89 3 Anchorage 

44 61.41 149.44 3 Peters Creek 

8 64.85 147.71 4 Fairbanks 

174 51.86 176.66 2 Adak 

92 51.86 176.66 4 Adak 

292 61.11 146.28 3 Valdez 

35 61.11 146.28 3 Valdez 

201 61.11 146.28 3 Valdez 

29 61.33 149.63 2 Eagle River 

70 61.60 149.08 2 Palmer 

85 51.86 176.66 2 Adak 

226 52.94 173.25E 4 Attu 

289 52.72 174.11E 4 Shemya 

59.63 151.55 4 Homer 

49 51.86 176.66 3 Adak 
~Eq. No. 

2868 

2869 

2870 

2871 

2872 

2873 

2874 

2875 

2876 

2877 

2878 

2879 

2880 

2881 

2882 

2 

2 

2 

2 

2 

883 

884 

885 

886 

887 

EARTHQUAKE PARAMETERS 

Dat.e Time Epicent.er 

Yr Mo Dy Hr Mn Sec Lat. 0 N Lon °W 

1977 03 18 02 56 

1977 03 25 13 39 45.2 60.84 148.14 

1977 03 26 04 36 14.7 52.30 168.26 

1977 03 30 17 41 38 52.55 172.52E 

1977 04 12 13 06 00.3 60.80 149.22 

1977 04 18 23 44 

1977 04 20 12 11 49.1 59.45 150.61 

1977 04 23 17 59 

1977 04 27 13 29 08.4 62.29 150.97 

1977 05 05 00 22 38.3 64.84 148.36 

1977 05 11 17 33 30.7 61.70 150.47 

1977 05 12 15 08 

1977 05 25 18 06 34.1 67.38 150.30 

1977 05 30 15 16 01.6 52.43 169.71 

1977 05 30 18 40 26.6 60.89 149.69 

1977 06 02 16 29 46.3 61.31 150.33 

1977 06 06 10 08 11.5 62.16 149.55 

1977 06 12 21 09 14.4 61.63 146.15 

1977 06 17 05 32 12 58.27 151.82 

1977 06 17 08 26 28.9 61.49 150.32 

Mag Dep tl 

km km 

3.6 

4.6 55 37 

64 

97 

103 

107 

134 

80 

98 

99 

105 

103 

5.7 38 82 

5.0 31 109 

4.4 39 58 

90 

4.1 

4.8 33 57 

3.1 38 133 

3.7 9 27 

31 

3.9 76 18 

27 

53 

63 

126 9 

5.6 33 81 

42 19 

37 

86 

3.6 67 38 

26 

74 

4.1 60 67 

4.2 35 

58 

62 

4.0 36 70 

4.3 74 25 

39 

43 

44 

45 

69 

81 

108 

67 

94 

123 

INTENSITY INFORMATION 

Obs. Location INT Locality 

Lat. 0 N Lon ow MM 

64.85 147.71 3 Fairbanks 

60.75 148.80 5 Whittier 

60.95 149.30 5 Girdwood 

61.33 149.63 5 Eagle River 

61.21 149.89 5 Anchorage 

60.11 149.41 5 Seward 

60.55 145.75 5 Cordova 

60.48 149.40 4 Moose Pass 

61.42 149.50 4 Chugiak 

61.60 149.08 4 Palmer 

61.11 146.28 4 Valdez 

61.21 149.89 3 Anchorage 

52.94 168.86 4 Nikolski 

52.72 174.11E 4 Shemya 

61.21 149.89 3 Anchorage 

60.01 149.54 3 Indian House 

62.97 155.67 3 McGrath 

65.32 148.30 3 Tatalina 

59.63 151.55 4 Homer 

64.85 147.71 2 Fairbanks 

63.26 149.45 2 Gold Creek 

64.86 147.80 3 College 

64.85 147.71 3 Fairbanks 

61.70 150.13 4 Willow 

61.85 150.06 3 Kashwitna 

61.58 149.50 2 Wasilla 

61.21 149.89 2 Anchorage 

67.41 150.10 3 Wiseman 

67.41 150.10 3 Wiseman 

52.94 168.86 4 Nikolski 

61.05 149.79 2 Potter 

61.21 149.89 2 Anchorage 

61.60 149.08 2 Palmer 

61.33 149.63 6 Eagle River 

61.21 149.89 4 Anchorage 

61.60 149.08 4 Palmer 

61.60 149.08 3 Palmer 

3 Taps Sheep Camp 

61.11 146.28 3 Valdez 

62.11 145.55 3 Glennallen 

57.75 152.50 3 Kodiak 

61.70 150.13 5 Willow 

61.21 149.89 5 Anchorage 

61.25 149.68 5 Fort Richardson 

61.42 149.50 5 Chugiak 

61.58 149.50 5 Wasilla 

61.96 151.18 5 Skwentna 

60.95 149.30 5 Girdwood 

60.54 150.76 5 Sterling 

61.60 149.08 4 Palmer 

62.33 150.11 4 Talkeetna 

60.48 149.40 3 Moose Pass 

Table 1-Earthquakes and Intensity Data 103 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~Eq. Date Time Epicenter Mag Dep !::J. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

2888 1977 06 29 08 47 15.6 51.77 176.22 5.0 60 32 51.86 176.66 4 Adak 

2889 1977 07 08 19 59 39.9 61.17 150.85 4.7 72 52 61.21 149.89 5 Anchorage 

77 61.42 149.50 5 Chugiak 

63 61.25 149.68 3 Fort Richardson 

142 60.11 149.41 3 Seward 

2890 1977 07 08 20 32 46.7 62.33 150.10 3.7 18 1 62.33 150.11 3 Talkeetna 

2891 1977 07 11 15 57 17.2 64.56 147.27 4.5 14 39 64.85 147.71 5 Fairbanks 

52 64.83 148.15 5 Ester 

14 64.66 147.10 4 Eielson AFB 

42 64.86 147.80 4 College Observatory 

99 64..58 149.33 2 Nenana 

2892 1977 07 20 13 24 25.9 54.61 161.60 5.3 53 66 55.04 162.31 5 King Cove 

86 55.18 162.50 5 Cold Bay 

106 55.33 160.51 5 Sand Point 

119 54.86 163.40 5 False Pass 

2893 1977 07 22 05 57 00.5 61.03 150.40 3.8 51 34 61.21 149.89 3 Anchorage 

95 61.60 149.08 3 Palmer 

2894 1977 07 26 18 39 21.7 62.53 149.04 69 60 62.33 150.11 4 Talkeetna 

104 61.60 149.08 3 Palmer 

109 61.58 149.50 3 Wasilla 

154 61.21 149.89 2 Anchorage 

2895 1977 08 04 15 10 24.6 59.53 152.89 102 311 61.60 149.08 2 Palmer 

2896 1977 08 15 00 24 33.2 51.59 176.38 4.5 63 36 51.86 176.66 4 Adak 

2897 1977 08 16 06 30 18.5 67.52 150.25 3.5 39 14 67.41 150.10 4 Wiseman 

2898 1977 08 17 16 48 31.3 51.87 175.34 5.4 57 91 51.86 176.66 4 Adak 

2899 1977 08 18 19 02 49 51.83 175.18 4.2 33 102 51.86 176.66 2 Adak 

2900 1977 08 29 20 59 59.2 51.56 173.97 5.4 25 189 51.86 176.66 2 Adak 

2901 1977 08 30 06 50 39.9 63.16 151.11 5.0 130 111 63.38 148.95 5 Cantwell 

127 63.73 148.91 5 McKinley Park 

218 61.33 149.63 5 Eagle River 

106 62.33 150.11 4 Talkeetna 

170 61.70 150.13 4 Willow 

195 61.58 149.50 4 Wasilla 

211 61.42 149.50 4 Chugiak 

203 61.60 149.08 3 Palmer 

226 61.21 149.89 3 Anchorage 

2 902 1977 08 30 15 12 27.6 51.38 173.79 5.4 33 206 51.86 176.66 2 Adak 

2 903 1977 09 04 15 40 57.3 51.21 178.39E 5.6 34 140 51.86 176.66 2 Adak 

339 52.72 174.11E 2 Shemya 

2 904 1977 09 04 17 10 30.6 51.10 178.27E 5.5 31 140 51.86 176.66 2 Adak 

338 52.72 174.11E 2 Shemya 

2 905 1977 09 04 17 24 42.8 51.14 177.95E 5.8 8 120 51.86 176.66 2 Adak 

317 52.72 174.11E 2 Shemya 

2 906 1977 09 09 15 58 56.4 62.19 149.53 4.6 59 70 61.60 149.08 2 Palmer 

111 61.21 149.89 2 Anchorage 

2 907 1977 09 17 15 42 42.2 60.86 150.84 3.7 33 40 60.58 151.31 4 Kenai 

2 908 1977 09 17 18 26 29.9 61.03 152.92 4.8 150 101 60.58 151.31 4 Kenai 

164 61.21 149.89 2 Anchorage 

1,93 61.58 149.50 2 Wasilla 

226 60.75 148.80 2 Whittier 

2 909 1977 09 17 21 25 21.4 64.82 14 7.43 4.0 20 14 64.85 147.71 4 Fairbanks 

104 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

l~q. Date Time Epicenter Mag Dep A Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

2910 1977 10 03 13 31 16.4 65.15 146.84 3.3 33 53 64.85 147.71 3 Fairbanks 

2911 1977 10 16 04 25 40 59.88 152.55 4.6 82 63 59.63 151.55 5 Homer 

60 59.66 151.58 3 Diamond Ridge 

2912 1977 10 18 10 48 37.3 60.70 150.79 3.7 33 31 60.58 151.31 2 Kenai 

75 61.21 149.89 2 Anchorage 

2913 1977 10 19 02 16 02.6 62.88 150.56 5.0 102 75 63.50 150.00 3 McKinley N atl. Park 

189 61.21 149.89 3 Anchorage 

2914 1977 10 27 08 53 20.5 64.65 164.97 33 27 64.50 165.41 2 Nome 

2915 1977 10 28 08 53 34.5 60.91 149.72 3.4 26 35 61.21 149.89 2 Anchorage 

2916 1977 11 04 01 22 26.5 61.13 150.30 42 24 61.21 149.89 2 Anchorage Area 

2917 1977 11 04 09 52 55.7 51.66 175.95 5.7 33 54 51.86 176.66 6 Adak 

112 52.12 174.50 6 Atka Island 

2918 1977 11 04 18 07 31.3 51.43 175.56 5.4 33 90 51.86 176.66 4 Adak 

2919 1977 11 06 19 11 02.7 62.10 144.94 3.3 33 32 62.11 145.55 2 Glennallen 

2920 1977 11 17 03 33 56 64.97 14 7.91 3.9 16 13 64.86 147.80 4 College 

19 64.83 148.15 4 Ester 

16 64.85 147.71 3 Fairbanks 

2921 1977 11 17 05 00 09.6 64.61 149.54 3.3 25 87 64.86 147.80 2 College 

2922 1977 11 17 12 27 06.3 61.29 149.40 39 13 61.33 149.63 3 Eagle River 

2923 1977 11 20 18 53 57.8 62.43 150.66 4~9 79 31 62.33 150.11 4 Talkeetna 

124 61.71 148.86 4 Sutton 

137 63.38 148.95 4 Cantwell 

124 61.60 149.08 3 Palmer 

2924 1977 11 27 15 05 06.8 58.56 155.38 4.9 116 75 58.67 156.66 4 King Salmon 

166 57.87 152.88 4 Port Lions 

250 59.63 151.55 4 Homer 

192 57.75 152.50 2 Kodiak 

2925 1977 12 08 01 58 05.8 59.45 151.36 4.7 65 23 59.63 151.55 4 Homer 

2 926 1977 12 15 01 29 22.6 61.37 150.01 3.0 38 19 61.21 149.89 3 Anchorage 

2927 1977 12 16 21 49 21.7 59.77 153.45 4.9 118 314 61.60 149.08 2 Palmer 

2 928 1977 12 27 15 09 51 60.39 153.70 5.1 175 129 60.24 151.38 5 Clam Gulch 

147 61.01 151.33 5 Tyonek 

147 59.63 151.55 5 Homer 

224 60.91 149.75 5 Hope 

227 61.21 149.89 5 Anchorage 

245 61.33 149.63 5 Eagle River 

255 61.42 149.50 5 Chugiak 

263 61.58 149.50 5 Wasilla 

123 59.77 151.87 4 Anchor Point 

133 60.58 151.31 4 Kenai 

162 60.54 150.76 4 Sterling 

213 60.49 149.83 4 Cooper Landing 

237 60.48 149.40 4 Moose Pass 

239 60.11 149.41 4 Seward 

289 62.33 150.11 4 Talkeetna 

412 61.11 146.28 4 Valdez 

130 60.38 151.35 8 Kasilof 

302 57.75 152.50 3 Kodiak 

2 929 1977 12 29 21 48 16.7 61.65 146.38 4.3 57 60 61.11 146.28 8 Valdez 

2 Palmer-Wasilla Area 

2 930 1978 01 05 19 56 09.8 61.33 151.65 4.4 110 95 61.21 149.89 3 Anchorage 

Table !-Earthquakes and Intensity Data 105 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~· Date Time Epicenter Mag Dep A. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon ow MM 

2930 1978 01 05 19 56 09.8 61.33 151.65 4.4 110 118 61.58 149.50 3 Wasilla 

140 61.60 149.08 2 Palmer 

2931 1978 01 06 07 08 43.8 51.78 176.01 5.3 63 46 51.86 176.66 4 Adak 

2932 1978 01 06 21 59 01.1 60.91 149.38 4.6 45 6 60.95 149.30 5 Girdwood 

36 60.75 148.80 4 Whittier 

43 61.21 149.89 4 Anchorage 

49 61.33 149.63 4 Eagle River 

53 60.49 149.83 4 Cooper Landing 

57 61.42 149.50 4 Chugiak 

89 60.11 149.41 4 Seward 

103 60.48 151.05 4 Soldotna 

111 60.58 151.31 4 Kenai 

133 60.24 151.38 4 Clam Gulch 

376 57.93 152.50 4 Ouzinkie 

45 61.23 149.90 3 Elmendorf AFB 

48 60.48 149.40 3 Moose Pass 

79 61.60 149.08 3 Palmer 

2933 1978 01 09 07 06 05.8 62.00 148.82 3.5 9 3 Lower Susitna Valley 

56 61.54 149.23 3 Matanuska 

105 61.21 149.89 3 Anchorage 

2934 1978 01 09 22 18 14.6 51.61 177.17 3.9 121 45 51.86 176.66 2 Adak 

2935 1978 01 10 12 09 16.4 64.74 147.44 2.8 24 18 64.85 147.71 3 Fairbanks 

2936 1978 01 18 17 04 18.1 52.92 166.43 70 105 53.86 166.53 4 Unalaska 

2937 1978 01 22 02 02 54.0 60.24 152.33 115 171 61.21 149.89 3 Anchorage 

2938 1978 01 27 18 52 59.2 60.37 151.12 4.7 70 13 60.48 151.05 3 Soldotna 

26 60.58 151.31 3 Kenai 

115 61.21 149.89 3 Anchorage 

134 61.33 149.63 3 Eagle River 

2939 1978 01 28 18 53 06.8 60.07 151.33 4.5 77 57 60.58 151.31 3 Kenai 

75 60.74 151.33 3 Nikishka 

149 61.21 149.89 2 Anchorage 

2940 1978 02 12 08 56 38.9 59.45 152.62 5.4 72 49 59.48 151.75 4 Seldovia 

55 59.77 151.87 4 Anchor Point 

64 59.63 151.55 4 Homer 

169 57.93 152.50 4 Ouzinkie 

47 59.35 151.82 3 Port Graham 

126 59.44 154.85 3 Kokhanok 

189 57.75 152.50 3 Kodiak 

41 59.35 151.92 2 English Bay 

247 58.67 156.66 2 King Salmon 

2941 1978 02 16 20 53 49.0 61.31 144.89 4.1 29 61.50 144.52 4 Chitina 

2942 1978 03 06 18 40 23.6 51.76 175.81 4.7 65 60 51.86 176.66 2 Adak 

2943 1978 03 20 03 59 05.0 60.18 153.61 4.9 153 130 59.63 151.55 2 Homer 

233 61.21 149.89 2 Anchorage 

2944 1978 03 20 08 15 37.5 59.84 153.24 3.8 134 141 60.48 151.05 3 Soldotna 

98 59.63 151.55 2 Homer 

135 60.58 151.31 2 Kenai 

2 945 1978 03 31 00 38 13.4 61.77 151.41 5.1 90 24 61.96 151.18 4 Skwentna 

68 61.70 150.13 4 Willow 

85 61.01 151.33 4 Tyonek 

92 62.33 150.11 4 Talkeetna 

102 61.21 149.89 4 Anchorage 

106 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

IEq. Dat.e Time Epicenter Mag Dep !:!. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat. 0 N Lon °W MM 

2945 1978 03 31 00 38 13.4 61.77 151.41 5.1 90 103 61.58 149.50 4 Wasilla 

109 61.42 149.50 4 Chugiak 

133 60.58 151.31 4 Kenai 

145 60.95 149.30 4 Girdwood 

155 60.38 151.35 4 Kasilof 

166 60.49 149.83 4 Cooper Landing 

180 60.75 148.80 4 Whittier 

100 61.23 149.90 3 Elmendorf AFB 

125 61.60 149.08 3 Palmer 

180 60.48 149.40 3 Moose Pass 

239 59.63 151.55 3 Homer 

2946 1978 04 09 17 12 59.9 60.69 151.84 4.5 101 31 60.58 151.31 3 Kenai 

120 61.21 149.89 3 Anchorage 

119 59.63 151.55 2 Homer 

2947 1978 04 12 03 42 03.5 56.42 152.69 6.0 14 92 56.55 154.16 5 Sitkinak Island 

96 57.21 153.33 4 Old Harbor 

149 57.75 152.50 4 Kodiak 

169 57.93 152.50 3 Ouzinkie 

129 57.17 154.29 2 Olga Bay 

147 57.58 153.83 2 Zachar Bay 

2948 1978 04 19 01 49 03.5 60.14 153.54 4.6 158 232 61.21 149.89 2 Anchorage 

2949 1978 04 19 14 52 18.1 61.00 146.49 3.3 40 17 61.11 146.28 4 Valdez 

2950 1978 04 21 20 40 37.7 64.53 147.95 3.7 30 37 64.86 147.80 2 College 

2951 1978 04 24 04 28 47.0 51.64 176.09 5.2 53 46 51.86 176.66 3 Adak 

2952 1978 05 05 05 32 47.4 63.30 150.97 5.2 134 4 Wide Pass 

117 62.33 150.11 4 Talkeetna 

150 61.96 151.18 4 Skwentna 

183 61.70 150.13 4 Willow 

213 61.60 149.08 3 Palmer 

240 61.21 149.89 3 Anchorage 

2953 1978 05 11 00 23 37.6 51.67 176.10 5.6 59 44 51.86 176.66 4 Adak 

2954 1978 05 12 12 16 03.9 62.25 149.40 5.1 67 38 62.33 150.11 4 Talkeetna 

56 61.85 150.06 4 Kashwitna 

74 61.60 149.08 4 Palmer 

75 61.58 149.50 4 Wasilla 

93 61.42 149.50 4 Chugiak 

98 61.96 151.18 4 Skwentna 

113 63.26 149.45 4 Gold Creek 

117 61.23 149.90 4 Elmendorf AFB 

119 61.21 149.89 4 Anchorage 

145 60.95 149.30 4 Girdwood 

167 63.73 148.91 4 McKinley Park 

170 60.75 148.80 4 Whittier 

201 62.11 145.55 4 Glennallen 

220 62.33 145.15 4 Gakona 

314 59.63 151.55 4 Homer 

302 64.85 147.71 3 Fairbanks 

197 60.48 149.40 2 Moose Pass 

294 64.83 148.15 2 Ester 

2955 1978 05 24 06 16 55.4 51.23 179.21 6.0 25 190 51.86 176.66 4 Adak 

2956 1978 05 24 09 53 03.4 51.13 179.20 5.2 33 194 51.86 176.66 3 Adak 

2957 1978 05 25 10 39 57.4 64.55 152.59 4.0 33 73 65.18 152.16 4 Tanana 

2958 1978 05 31 18 29 25.6 61.36 149.70 3.0 44 42 61.60 149.08 2 Palmer 

Table 1-Earthquakes and Intensity Data 107 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

l~q. Date Time Epicent.er Mag Dep A Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat. 0 N Lon °W MM 

2959 1978 06 10 08 23 59.6 57.92 156.72 4.5 10 49 58.18 157.40 2 Egegik 

84 58.67 156.66 1 King Salmon 

2960 1978 06 10 19 35 10.2 60.30 146.45 4.8 20 48 60.55 145.75 4 Cordova 

91 61.11 146.28 3 Valdez 

213 61.21 149.89 3 Anchorage 

2961 1978 06 12 07 30 39.3 59.86 150.76 4.0 55 51 59.63 151.55 3 Homer 

2962 1978 06 22 05 41 27.7 51.61 179.41 4.8 33 192 51.86 176.66 3 Adak 

2963 1978 07 13 15 27 33.5 61.11 149.95 3.5 40 72 61.60 149.08 2 Palmer 

2964 1978 07 16 05 03 02.3 63.57 150.52 3.5 31 82 63.73 148.91 3 McKinley Park 

2965 1978 07 19 18 54 32.8 61.33 149.98 3.0 13 17 61.27 150.27 2 Susitna Flats 

19 61.33 149.63 2 Eagle River 

28 61.42 149.50 2 Chugiak 

2966 1978 07 23 15 19 35.5 63.31 147.26 5.0 33 276 65.57 144.90 3 Central Alaska 

2967 1978 07 27 14 18 48.0 65.00 147.60 3.8 20 18 64.85 147.71 4 Fairbanks 

2968 1978 07 27 15 51 42.2 64.85 147.59 3.6 10 6 64.85 147.71 3 Fairbanks 

2969 1978 07 27 17 11 21.1 64.93 148.02 3.7 10 17 64.85 147.71 3 Fairbanks 

2970 1978 08 03 06 33 30.9 59.78 151.15 89 28 59.63 151.55 3 Homer 

2971 1978 08 08 09 30 03.3 61.39 146.91 4.3 53 118 61.60 149.08 5 Palmer 

46 61.11 146.28 4 Valdez 

108 62.11 145.55 4 Glennallen 

124 60.75 148.80 4 Whittier 

300 64.03 145.73 4 Delta Junction 

138 60.95 149.30 3 Girdwood 

161 61.21 149.89 3 Anchorage 

138 61.42 149.50 2 Chugiak 

2972 1978 08 13 00 49 41.0 62.28 149.71 4.1 65 85 61.96 151.18 4 Skwentna 

96 61.42 149.50 4 Chugiak 

120 61.21 149.89 4 Anchorage 

79 61.58 149.50 3 Wasilla 

83 61.60 149.08 3 Palmer 

582 67.50 149.44 3 Big Lake (Settlement) 

2973 1978 08 18 18 52 28.4 59.89 153.53 5.4 123 126 60.24 151.38 6 Clam Gulch 

170 60.54 150.76 5 Sterling 

110 59.48 151.75 4 Seldovia 

115 59.63 151.55 4 Homer 

145 60.58 151.31 4 Kenai 

174 61.01 151.33 4 Tyonek 

216 60.49 149.83 4 Cooper Landing 

228 57.87 152.88 4 Port Lions 

238 60.48 149.40 4 Moose Pass 

248 61.21 149.89 4 Anchorage 

261 60.95 149.30 4 Girdwood 

263 61.96 151.18 4 Skwentna 

265 57.52 153.99 4 Larsen Bay 

267 61.33 149.63 4 Eagle River 

278 60.75 148.80 4 Whittier 

279 61.42 149.50 4 Chugiak 

152 60.48 151.05 3 Soldotna 

224 58.67 156.66 3 King Salmon 

245 61.18 149.91 3 Spenard 

246 57.75 152.50 3 Kodiak· 

274 61.70 150.13 3 Willow 

437 60.55 145.75 3 Cordova 

108 U.S. Geological Survey Bulletin 1840 
l~q. No. 

2973 

2974 

2975 

2976 

2977 

2978 

2979 

2980 

2981 

2982 

2983 

2 

2 

2 

2 

2 

2 

2 

2 

2 

2 

984 

985 

986 

987 

988 

989 

990 

991 

992 

993 

I EARTHQUAKE PARAMETERS 

Dat.e Time Epicent.er 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1978 08 18 18 52 28.4 59.89 153.53 

1978 08 22 04 13 55.3 65.16 151.99 

1978 08 22 09 53 24.2 65.23 152.12 

1978 08 22 10 12 02.8 64.92 152.53 

1978 08 22 10 29 08.0 64.99 152.31 

1978 08 26 13 44 31.2 65.08 152.36 

1978 09 03 06 27 05.4 64.58 147.16 

1978 09 18 17 02 54.9 63.66 147.59 

1978 09 19 08 37 56.0 61.34 147.18 

1978 09 20 11 46 05.9 61.92 149.23 

1978 09 21 14 45 19.6 61.11 151.81 

1978 09 25 09 37 01.9 51.79 175.28 

1978 09 26 16 08 18.6 64.99 147.55 

1978 09 28 23 53 13.7 63.99 147.71 

1978 10 04 18 53 00.1 51.81 177.05 

1978 10 04 19 55 17.5 50.93 173.53E 

1978 10 06 05 54 05.2 61.93 150.67 

1978 10 17 20 50 48.7 51.72 176.94 

1978 10 27 04 29 31.5 62.20 151.05 

1978 10 30 11 11 38.4 60.96 150.32 

1978 10 31 12 28 30.1 61.91 149.57 

Mag Dep 

km 

5.4 123 

4.0 14 

3.8 17 

3.8 1 

3.4 1 

3.3 33 

3.9 11 

88 

3.9 32 

3.8 8 

4.5 81 

4.6 62 

3.7 27 

4.4 33 

4.5 58 

5.3 33 

4.6 6 

5.0 61 

102 

3.3 48 

3.5 33 

INTENSITY INFORMATION 

A Obs. Location INT Locality 

km Lat 0 N Lon °W ~M 

499 63.83 149.02 3 Healy 

154 60.74 151.33 2 Nikishka 

629 64.85 147.71 2 Fairbanks 

8 65.18 152.16 2 Tanana 

6 65.18 152.16 2 Tanana 

34 65.18 152.16 2 Tanana 

22 65.18 152.16 2 Tanana 

15 65.18 152.16 2 Tanana 

9 64.66 147.10 2 Eielson AFB 

40 64.85 147.71 2 Fairbanks 

63 63.86 148.78 4 Usibelli 

74 63.38 148.95 4 Cantwell 

196 62.33 150.11 2 Talkeetna 

254 61.70 150.13 2 Willow 

146 61.21 149.89 3 Anchorage 

55 61.11 146.28 2 Valdez 

154 62.33 145.15 2 Gakona 

30 61.71 148.86 4 Sutton 

37 61.60 149.08 4 Palmer 

108 60.95 149.30 4 Girdwood 

2 Independence Mine Area 

87 61.21 149.89 2 Anchorage 

102 61.96 151.18 2 Skwentna 

65 60.58 151.31 4 Kenai 

81 60.48 151.05 4 Soldotna 

85 60.54 150.76 4 Sterling 

104 61.21 149.89 4 Anchorage 

120 61.33 149.63 4 Eagle River 

137 60.95 149.30 4 Girdwood 

156 61.60 149.08 4 Palmer 

171 61.71 148.86 2 Sutton 

95 51.86 176.66 2 Adak 

17 64.85 147.71 3 Fairbanks 

29 64.74 147.35 3 North Pole 

43 64.66 147.10 3 Eielson AFB 

3 Solcha 

67 63.83 149.02 3 Healy 

85 64.74 147.35 3 North Pole 

93 64.16 145.85 3 Big Delta 

96 64.85 147.71 3 Fairbanks 

97 64.03 145.73 3 Delta Junction 

102 64.58 149.33 3 Nenana 

27 51.86 176.66 4 Adak 

203 52.72 174.11E 3 Shemya 

3 Willow-Hatcher Pass Area 

73 61.58 149.50 2 Wasilla 

92 61.60 149.08 2 Palmer 

25 51.86 176.66 6 Adak 

51 62.33 150.11 2 Talkeetna 

36 61.21 149.89 3 Anchorage Area 

2 Palmer Area 

Table 1-Earthquakes and Intensity Data 109 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~Eq Date Time Epicenter Mag Dep A Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat 0 N Lon °W MM 

2994 1978 11 14 22 27 45.7 64.54 147.03 3.7 25 47 64.85 147.71 2 Fairbanks 

2995 1978 11 19 19 42 35.7 52.70 172.48E 5.3 47 110 52.72 174.11E 5 Shemya 

2996 1978 11 24 00 28 12.8 62.03 150.52 4.5 74 40 62.33 150.11 2 Talkeetna 

90 61.60 149.08 2 Palmer 

2997 1978 11 24 08 50 45.4 61.99 150.51 3.2 77 38 61.70 150.13 2 Willow 

2998 1978 12 02 21 57 20.0 59.69 151.66 3.7 13 9 59.63 151.55 5 Homer 

2999 1978 12 03 19 39 31.2 62.31 149.75 4.7 74 19 62.33 150.11 4 Talkeetna 

100 61.42 149.50 4 Chugiak 

71 61.70 150.13 3 Willow 

87 61.60 149.08 3 Palmer 

123 61.21 149.89 3 Anchorage 

82 61.58 149.50 2 Wasilla 

3000 1978 12 04 12 11 06.4 65.04 147.51 3.3 24 23 64.85 147.71 2 Fairbanks 

3001 1978 12 08 10 01 51.5 68.33 145.17 4.0 33 404 64.85 147.71 2 Fairbanks 

3002 1978 12 15 08 30 34.7 52.11 175.23E 5.6 47 195 52.72 174.11E 5 Shemya 

245 52.94 173.25E 4 Attn 

3003 1978 12 17 13 15 26.0 63.95 147.42 4.8 22 95 64.33 149.16 4 Clear 

101 64.85 147.71 4 Fairbanks 

104 64.83 148.15 4 Ester 

3004 1978 12 22 03 25 29.9 55.57 160.37 4.5 12 28 55.33 160.51 4 Sand Point 

3005 1978 12 24 13 13 08.1 63.56 157.59 5.0 33 135 64.74 156.94 4 Galena Airport 

3006 1979 01 04 15 35 04.0 61.73 150.04 3.4 34 6 61.70 150.13 3 Willow 

50 61.33 149.63 3 Eagle River 

3007 1979 01 08 10 11 00.8 61.77 150.08 2.5 45 56 61.60 149.08 2 Palmer 

3008 1979 01 10 00 34 48.1 61.58 150.06 3.0 42 52 61.60 149.08 2 Palmer 

3009 1979 01 25 02 49 03.5 63.32 151.16 3.5 33 239 64.85 147.71 3 Fairbanks 

3010 1979 01 25 19 30 06.1 60.13 153.12 5.5 105 97 60.24 151.38 4 Clam Gulch 

104 59.63 151.55 4 Homer 

106 59.48 151.75 4 Seldovia 

112 60.58 151.31 4 Kenai 

121 60.48 151.05 4 Soldotna 

138 60.54 150.76 4 Sterling 

139 61.01 151.33 4 Tyonek 

186 60.49 149.83 4 Cooper Landing 

206 60.11 149.41 4 Seward 

214 61.21 149.89 4 Anchorage 

295 57.52 153.99 4 Larsen Bay 

67 59.79 154.11 3 Pedro Bay 

120 60.74 151.33 3 Nikishka 

268 57.75 152.50 3 Kodiak 

274 61.60 149.08 3 Palmer 

294 62.33 150.11 3 Talkeetna 

299 57.55 154.53 3 Karluk 

337 57.17 154.29 3 Olga Bay 

595 64.85 147.71 3 Fairbanks 

3 011 1979 01 27 16 48 11.5 60.96 149.38 3.6 49 39 61.21 149.89 4 Anchorage 

52 61.42 149.50 4 Chugiak 

88 61.71 148.86 4 Sutton 

136 60.24 151.38 4 Clam Gulch 

157 62.33 150.11 4 Talkeetna 

147 61.96 151.18 3 Skwentna 

113 60.58 151.31 2 Kenai 

110 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~· Date Time Epicenter Mag Dep l:J. Obs. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km Lat. 0 N Lon °W MM 

3012 1979 01 27 18 57 55.0 54.77 161.25 6.0 17 78 55.33 160.51 5 Sand Point 

92 55.18 162.50 5 Cold Bay 

74 55.04 162.31 4 King Cove 

183 55.91 159.18 4 Perryville 

139 54.86 163.40 3 False Pass 

3013 1979 01 31 03 07 32.0 51.72 175.81 5.0 64 61 51.86 176.66 3 Adak 

3014 1979 02 01 12 29 05.4 60.24 152.84 4.8 109 92 60.58 151.31 4 Kenai 

102 60.48 151.05 4 Soldotna 

191 60.11 149.41 4 Seward 

99 59.63 151.55 3 Homer 

194 61.21 149.89 3 Anchorage 

3015 1979 02 06 22 52 00.6 60.72 151.77 87 30 60.58 151.31 3 Kenai 

48 60.48 151.05 3 Soldotna 

3016 1979 02 07 13 33 29.1 61.03 150.15 3.0 32 24 61.21 149.89 3 Anchorage 

3017 1979 02 09 18 49 25.1 60.06 152.59 4.8 88 49 60.04 151.71 3 Kenai Peninsula 

195 61.21 149.89 3 Anchorage 

3018 1979 02 13 05 34 25.9 55.45 157.16 5.9 33 124 56.30 158.45 4 Chignik 

137 55.91 159.18 4 Perryville 

188 56.91 158.68 4 Port Heiden 

237 57.57 157.58 4 Pilot Point 

213 55.33 160.51 3 Sand Point 

304 58.18 157.40 3 Egegik 

360 58.67 156.66 3 King Salmon 

368 58.75 157.00 2 Naknek 

3019 1979 02 17 08 01 24.6 62.80 148.28 95 140 61.60 149.08 2 Palmer 

3020 1979 02 17 10 48 08.7 62.31 149.50 4.9 54 32 62.33 150.11 3 Talkeetna 

124 61.21 149.89 3 Anchorage 

216 61.11 146.28 3 Valdez 

3021 1979 02 23 09 42 03.6 64.98 147.85 4.3 24 16 64.85 147.71 5 Fairbanks 

3022 1979 02 23 18 14 64.85 147.71 3 Fairbanks 

3023 1979 02 27 14 42 45.2 62.29 149.81 2.7 34 16 62.33 150.11 3 Talkeetna 

3024 1979 02 28 02 47 10.4 52.94 169.06 4.5 79 13 52.94 168.86 3 Nikolski 

3025 1979 02 28 21 27 06.1 60.64 141.59 6.4 15 73 59.99 141.72 7 Icy Bay Lumber Camp 

6 Mendenhall 

78 60.07 142.41 6 Cape Yakataga 

157 59.55 139.81 6 Yakutat 

164 61.37 138.95 6 Burwash Landing, Y.T. 

166 61.25 138.80 6 Destruction Bay, Y. T. 

173 61.30 138.70 6 Kluane Lake Camp, Y.T. 

196 62.36 140.86 6 Beaver Creek, Y.T. 

228 62.67 141.10 6 Border City 

259 61.13 146.25 6 Valdez Airport 

383 59.18 135.38 6 Haines 

470 58.39 134.57 6 Juneau Airport 

114 61.43 142.92 5 McCarthy 

159 61.60 139.40 5 Kluane Winderness, Y. T. 

159 61.99 140.60 5 Koidern, Y.T. 

161 62.00 140.60 5 White River, Y.T. 

165 59.51 139.66 5 Yakutat Airport 

174 61.20 138.60 5 Bayshore Esso, Y.T. 

224 60.75 137.50 5 Haines Junction,Y.T. 

228 60.55 145.75 5 Cordova 

253 60.40 137.00 5 Dezadeash, Y.T. 

Table 1-Earthquakes and Intensity Data 111 
~~- No. 

3025 

3 

3 

3 

3 

3 

3 

3 

3 

026 

027 

028 

029 

030 

031 

032 

033 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Oy Hr Mn Sec Lat 0 N Lon °W 

1979 02 28 21 27 06.1 60.64 141.59 

1979 03 01 07 08 53.7 60.63 141.24 

1979 03 02 09 34 45.4 60.37 140.70 

1979 03 14 07 56 31.4 59.79 151.92 

1979 03 14 13 31 34.5 60.98 149.39 

1979 03 24 18 37 41.8 61.53 149.93 

1979 03 26 23 11 

1979 03 27 11 39 09.0 51.82 175.33 

1979 03 27 18 38 42.2 60.49 148.98 

112 U.S. Geological Survey Bulletin 1840 

Mag Dep A 

km km 

6.4 15 356 

383 

410 

464 

173 

185 

247 

260 

260 

264 

267 

268 

271 

335 

349 

376 

452 

454 

454 

483 

502 

531 

700 

857 

99 

436 

449 

491 

515 

534 

697 

707 

749 

1193 

298 

480 

495 

532 

564 

5.4 11 90 

5.4 2 71 

100 

3.4 87 4 

27 

4.0 41 21 

37 

71 

52 36 

5.0 43 92 

2.9 26 53 

54 

38 

INTENSITY INFORMATION 

Obs. Location INT Locality 

Lat 0 N Lon °W MM 

60.73 135.08 5 Whitehorse, Y.T. 

60.17 134.70 5 Carcross, Y. T. 

58.41 135.83 5 Gustavus 

58.40 134.67 5 Auke Bay 

61.00 138.50 4 Arctic Institute, Y.T. 

61.50 144.52 4 Chitina 

61.95 145.30 4 Copper Center 

62.97 141.92 4 Northway 

61.11 146.28 4 Valdez 

62.12 145.45 4 Gulkana (FAA Airport) 

62.33 145.15 4 Gakona 

62.11 145.55 4 Glennallen 

60.10 136.80 4 DPW, Y.T. 

59.44 136.08 4 Thirty-Three Mile Cafe 

59.40 135.83 4 Klukwan 

59.38 135.33 4 Skagway 

60.49 149.83 4 Cooper Landing 

61.21 149.89 4 Anchorage 

59.57 133.70 4 Atlin, B.C. 

58.30 134.41 4 Juneau 

60.54 150.76 4 Sterling 

61.01 151.33 4 Tyonek 

59.79 154.11 4 Pedro Bay 

55.98 129.95 4 Stewart, B.C. 

61.35 142.69 3 May Creek 

61.42 149.50 3 Chugiak 

63.62 135.80 3 Mayo, Y.T. 

62.33 150.11 3 Talkeetna 

62.00 132.40 3 Ross River, Y.T. 

61.96 151.18 3 Skwentna 

58.46 130.04 3 Dease Lake, B.C. 

60.16 128.80 3 Watson Lake, Y.T. 

67.00 146.50 3 Venetie 

59.88 163.10 3 Kontiginak 

59.50 136.75 2 Customs, Y. T. 

62.20 133.20 2 Faro, Y.T. 

60.20 132.65 F Teslin, Y. T. 

57.06 135.50 F Sitka 

64.85 147.71 F Fairbanks 

60.07 142.41 3 Cape Yakataga 

59.99 141.72 3 ley Bay Lumber Camp 

60.07 142.41 3 Cape Yakataga 

59.77 151.87 3 Anchor Point 

59.63 151.55 3 Homer 

60;91 149.75 4 Hope 

61.21 149.89 4 Anchorage 

61.60 149.08 4 Palmer 

61.21 149.89 3 Anchorage 

62.24 150.10 3 Fish Lake 

62.33 150.11 3 Talkeetna 

51.86 176.66 4 Adak 

60.96 149.06 3 Alyeska 

60.95 149.30 3 Girdwood 

60.83 148.98 3 Portage 
~· o. 

3034 

3035 

3036 

3037 

3038 

3039 

3040 

3041 

3042 

3043 

3044 

3045 

3046 

3047 

3048 

3049 

3050 

3051 

3052 

3053 

3054 

3 

3 

3 

3 

055 

056 

057 

058 

EARTHQUAKE PARAMETERS 

Dat.e Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1979 04 02 02 15 31.4 64.81 147.43 

1979 04 04 08 16 15.3 60.32 153.59 

1979 04 17 02 59 20.3 61.68 150.12 

1979 04 18 17 06 19.5 62.16 149.52 

1979 04 20 12 49 06.9 60.32 140.87 

1979 04 25 00 27 57.6 63.35 149.50 

1979 04 25 09 39 00.0 64.88 148.83 

1979 04 28 07 33 06.0 64.61 149.46 

1979 05 05 06 50 38.8 62.97 148.23 

1979 05 09 14 22 21.0 61.93 148.92 

1979 05 13 18 51 

1979 05 14 20 14 36.0 61.73 150.89 

1979 05 18 05 35 22.6 64.41147.08 

1979 05 20 08 14 00.1 56.65 156.73 

1979 05 20 22 28 38.1 62.83 149.17 

1979 05 21 10 05 11.6 64.71 148.43 

1979 05 25 16 45 27.3 52.61 167.02 

1979 05 28 17 50 14.3 61.64 150.02 

1979 05 31 04 22 54.3 61.7 4 149.88 

1979 06 20 08 18 30.8 60.88 147.69 

1979 06 23 10 46 58.6 61.87 150.28 

1979 06 23 18 39 32.2 58.03 134.91 

1979 06 26 19 08 21.3 62.36 147.83 

1979 07 10 04 04 20.5 63.20 150.72 

1979 07 11 12 28 02.9 55.32 134.97 

Mag Dep D. 

km km 

3.1 10 14 

4.5 174 254 

2.7 33 56 

79 67 

5.3 15 90 

47 

104 

3.9 119 66 

86 

3.3 11 53 

3.0 28 7 

87 

4.6 77 159 

214 

2.9 12 38 

45 97 

3.2 28 8 

12 

58 

6.4 71 192 

113 

173 

190 

287 

283 

115 

123 

160 

175 

225 

269 

278 

95 22 

28 

3.0 33 38 

6.0 23 129 

45 28 

48 

50 

3.4 55 59 

3.3 33 

101 

3.1 33 21 

3.8 15 41 

58 

3.8 86 107 

118 

4.9 130 226 

5.1 10 105 

120 

INTENSITY INFORMATION 

Obs. Location INT Locality 

Lat 0 N Lon °W ~M 

64.85 147.71 3 Fairbanks 

61.42 149.50 3 Chugiak 

61.60 149.08 2 Palmer 

61.60 149.08 2 Palmer 

60.07 142.41 4 Cape Yakataga 

60.00 141.42 4 Icy Bay 

59.55 139.81 4 Yakutat 

62.76 149.69 3 Gold Creek (Town) 

62.61 150.01 3 Curry 

64.85 147.71 3 Fairbanks 

64.58 149.33 3 Nenana 

64.85 147.71 3 Fairbanks 

61.60 149.08 3 Palmer 

61.21 149.89 3 Anchorage 

61.60 149.08 3 Palmer 

51.86 176.66 3 Adak 

61.60 149.08 2 Palmer 

64.47 146.98 3 Salcha River 

64.41 146.83 3 Harding Lake 

64.85 147.71 3 Fairbanks 

57.52 153.99 6 Larsen Bay 

56.30 158.45 5 Chignik 

55.91 159.18 5 Perryville 

55.90 159.48 5 lvanof Bay 

59.05 158.50 5 Dillingham 

57.75 152.50 5 Kodiak 

57.57 157.58 4 Pilot Point 

56.91 158.68 4 Port Heiden 

56.94 154.16 4 Akhiok 

58.18 157.40 4 Egegik 

58.67 156.66 4 King Salmon 

57.87 152.88 4 Port Lions 

55.33 160.51 4 Sand Point 

62.89 149.59 3 Chulitna 

62.76 149.69 3 Gold Creek (Town) 

64.85 147.71 2 Fairbanks 

52.94 168.86 4 Nikolski 

61.58 149.50 2 Wasilla 

61.21 149.89 2 Anchorage 

61.60 149.08 2 Palmer 

61.21 149.89 3 Anchorage 

3 George Parks Hwy {mi 2.0) 

61.49 149.09 3 Goat Creek 

61.70 150.13 4 Willow 

58.28 134.40 4 Douglas 

58.39 134.20 4 Juneau-Douglas Area 

61.60 149.08 4 Palmer 

62.33 150.11 4 Talkeetna 

61.21 149.89 2 Anchorage 

56.25 134.65 4 Port Alexander 

55.48 133.10 4 Craig 

Table 1-Earthquakes and Intensity Data 113 
!Eq. 

No. 

3058 

3059 

3060 

3061 

3062 

3063 

3064 

3065 

3066 

3 067 

3 

3 

3 

3 

3 

3 

3 

3 

3 

3 

3 

3 

3 

3 

3 

3 

3 

3 

068 

069 

070 

071 

072 

073 

074 

075 

076 

077 

078 

079 

080 

081 

082 

083 

084 

085 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lotl ow 

1979 07 11 12 28 02.9 55.32 134.97 

1979 07 16 23 45 58.5 60.86 153.02 

1979 07 17 20 44 29.5 62.27 148.14 

1979 07 23 08 38 13.0 58.63 151.51 

1979 07 23 09 07 07.7 61.64 150.51 

1979 07 30 02 24 04.6 62.04 145.44 

1979 08 04 20 12 10.6 62.49 149.77 

1979 08 07 18 15 09.5 51.32 176.11 

1979 08 10 00 02 25.4 61.97 150.94 

1979 08 27 18 15 

1979 08 29 19 38 11.4 61.91 150.80 

1979 08 31 20 42 27.4 54.39 161.84 

1979 09 01 OS 27 17.6 53.98 165.20 

1979 09 14 07 29 

1979 09 23 10 17 20.8 52.29 17 4.03E 

1979 09 24 03 19 56.7 52.19 174.02E 

1979 09 26 07 18 

1979 09 27 22 18 

1979 10 07 OS 59 21.8 61.22 150.43 

1979 10 10 23 36 45.1 56.15 135.75 

1979 10 15 06 24 01.2 51.77 175.24 

1979 10 16 21 16 05.2 51.85 175.36E 

1979 10 18 03 35 26.9 51.86 177.13E 

1979 10 27 06 32 02.3 61.70 149.58 

1979 10 27 22 16 59.2 59.38 152.90 

1979 10 28 06 24 09.8 59.86 151.67 

1979 11 02 03 21 04.1 51.16 178.05 

1979 11 07 OS 14 36.1 60.59 150.68 

114 U.S. Geological Survey Bulletin 1840 

Mag ~ep 

km 

5.1 10 

4.6 141 

5.3 58 

4.4 33 

2.9 49 

3.5 14 

4.1 99 

4.6 33 

4.3 81 

4.0 

3.9 88 

5.1 20 

5.8 69 

5.8 43 

4.8 

3.2 

3.1 

3.1 9 

4.4 33 

4.8 54 

5.3 34 

6.0 62 

3.0 44 

4.1 77 

3.6 82 

4.8 33 

3.5 90 

INTENSITY INFORMATION 

.6 Obs. Location INT Locality 

km Lat 0 N Lon ow MM 

124 55.58 133.06 4 Klawock 

136 55.25 132.83 4 Hydaburg 

208 56.81 132.95 4 Petersburg 

217 55.13 131.58 4 Metlakatla 

197 57.06 135.50 2 Sitka 

215 55.36 131.58 2 Ketchikan 

173 61.21 149.89 3 Anchorage 

56 61.79 148.46 4 Chickaloon 

73 61.71 148.86 4 Sutton 

119 61.42 149.50 4 Chugiak 

150 61.21 149.89 4 Anchorage 

159 60.95 149.30 4 Girdwood 

173 60.75 148.80 4 Whittier 

211 60.48 149.40 4 Moose Pass 

89 61.60 149.08 3 Palmer 

102 62.33 150.11 3 Talkeetna 

122 61.70 150.13 3 Willow 

136 62.11 145.55 3 Glennallen 

162 61.96 151.18 3 Skwentna 

162 61.11 146.28 3 Valdez 

288 64.85 147.71 2 Fairbanks 

114 57.75 152.50 2 Kodiak 

76 61.60 149.08 2 Palmer 

10 62.11 145.55 2 GlennaJien 

25 62.33 150.11 3 Talkeetna 

30 62.76 149.69 3 Gold Creek (Town) 

106 61.60 149.08 2 Palmer 

71 51.86 176.66 3 Adak 

59 62.33 150.11 3 Talkeetna 

51.86 176.66 3 Adak 

78 61.58 149.50 3 Wasilla 

80 61.77 149.31 3 Hatcher Pass 

98 55.18 162.50 3 Cold Bay 

88 53.88 166.53 4 Dutch Harbor 

52.72 174.11E 3 Shemya 

48 52.72 174.11E 4 Shemya 

59 52.72 174.11E 4 Shemya 

51.86 176.66 3 Adak 

51.86 176.66 3 Adak 

29 61.21 149.89 3 Anchorage 

102 57.06 135.50 3 Sitka 

98 51.86 176.66 4 Adak 

129 52.72 174.11E 2 Shemya 

227 52.72 174.11E 3 Shemya 

29 61.60 149.08 2 Palmer 

81 59.63 151.55 3 Homer 

26 59.63 151.55 3 Homer 

124 51.86 176.66 3 Adak 

8 60.53 150.75 3 Naptown 

7 60.54 150.76 2 Sterling 
,~. No. 

3085 

3086 

3087 

3088 

3089 

3090 

3091 

3092 

3093 

3094 

3095 

3096 

3097 

3098 

3099 

3100 

3101 

3 

3 

102 

103 

EARTHQUAKE PARAMETERS 

Date Time Epicenter 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1979 11 07 03 14 36.1 60.59 150.68 

1979 11 14 23 00 42.8 61.38 150.09 

1979 11 15 02 08 34.8 61.26 150.00 

1979 11 15 07 15 13.2 60.18 149.68 

1979 12 26 13 12 16.7 61.42 151.62 

1980 01 04 03 47 36.9 61.66 147.44 

1980 01 19 07 02 35.0 51.32 178.49 

1980 02 03 20 40 13.3 64.65 149.55 

1980 02 08 05 51 16.7 64.68 146.87 

1980 02 13 15 49 03.0 64.95 147.72 

1980 03 02 00 28 23.0 59.62 151.36 

1980 03 10 11 48 52.2 54.47 162.92 

1980 03 12 23 04 35.4 52.15 168.98 

1980 03 13 03 29 35.8 64.97 147.57 

1980 03 17 07 37 33.7 59.99 153.14 

1980 03 24 03 59 51.3 52.97 167.67 

1980 03 27 22 20 26.9 52.79 167.75 

1980 03 28 09 23 40.9 53.00 167.62 

1980 04 03 03 46 04.3 63.15 149.57 

Mag Dep ~ 

km km 

3.5 90 24 

5.1 57 24 

39 

22 

32 

75 

87 

99 

22 

59 

97 

111 

36 

3.8 49 8 

3.6 69 17 

4.1 111 96 

3.7 66 140 

5.8 50 140 

3.0 33 13 

3.3 10 11 

44 

33 29 

4.4 13 11 

4.8 52 84 

5.4 40 88 

3.1 21 13 

15 

16 

28 

37 

4.9 132 121 

224 

6.2 33 80 

125 

126 

180 

4.7 33 77 

4.9 30 84 

5.0 92 40 

45 

81 

88 

95 

164 

175 

175 

217 

246 

156 

165 

193 

INTENSITY INFORMATION 

Obs. Location INT Localit.y 

Lat 0 N Lon °W MM 

60.48 151.05 2 Soldotna 

61.18 149.91 5 Spenard 

61.58 149.50 5 Wasilla 

61.21 149.89 4 Anchorage 

61.42 149.50 4 Chugiak 

61.71 148.86 4 Sutton 

61.96 151.18 4 Skwentna 

60.75 148.80 4 Whittier 

3 Big Lake Area 

61.23 149.81 3 Anchorage(Mountain View) 

61.60 149.08 3 Palmer 

60.72 151.25 3 North Kenai 

60.58 151.31 3 Kenai 

61.70 150.13 2 Willow 

61.21 149.89 4 Anchorage 

60.11 149.41 4 Seward 

61.21 149.89 2 Anchorage 

61.21 149.89 3 Anchorage 

51.86 176.66 3 Adak 

64.58 149.33 3 Nenana 

64.66 147.10 4 Eielson AFB 

64.85 147.71 3 Fairbanks 

64.74 147.35 3 North Pole 

59.63 151.55 4 Homer 

55.18 162.50 4 Cold Bay 

52.94 168.86 2 Nikolski 

64.85 147.55 3 Fort Wainwright 

64.85 147.71 3 Fairbanks 

64.86 147.80 3 College 

64.74 147.35 3 North Pole 

64.95 148.35 3 Murphy Dome 

60.58 151.31 3 Kenai 

61.21 149.89 2 Anchorage 

52.94 168.86 5 Nikolski 

53.86 166.53 5 Unalaska 

53.88 166.53 4 Dutch Harbor 

54.13 165.77 3 Akutan 

52.94 168.86 4 Nikolski 

52.94 168.86 3 Nikolski 

63.38 148.95 4 Cantwell 

63.50 150.00 4 McKinley Natl. Park 

63.83 149.02 4 Healy 

63.86 148.78 4 Usibelli 

62.33 150.11 4 Talkeetna 

61.70 150.13 4 Willow 

61.60 149.08 4 Palmer 

61.58 149.50 4 Wasilla 

61.21 149.89 4 Anchorage 

60.95 149.30 4 Girdwood 

61.96 151.18 3 Skwentna 

61.71 148.86 3 Sutton 

61.42 149.50 3 Chugiak 

Table 1-Earthquakes and Intensity Data 115 
I~Eq. No. 

3103 

3104 

3105 

3106 

3107 

3108 

3109 

3110 

3 111 

3112 

3 

3 

3 

3 

3 

3 

3 

113 

114 

115 

116 

117 

118 

119 

EARTHQUAKE PARAMETERS 

Dat.e Time Epicent.er 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1980 04 03 03 46 04.3 63.15 149.57 

1980 04 03 08 37 29.5 61.60 150.56 

1980 04 06 14 47 43.2 61.38 147.82 

1980 04 13 02 08 32.2 55.04 160.31 

1980 04 14 22 07 36.8 52.98 167.84 

1980 04 15 07 50 19.5 51.87 175.96 

1980 05 01 08 22 52.9 61.89 146.94 

1980 05 07 03 06 16.0 62.99 150.80 

1980 05 14 06 40 37.2 68.41 148.90 

1980 05 29 07 04 39.9 64.91 147.43 

1980 06 03 10 59 25.2 60.00 152.67 

1980 06 09 08 51 47.0 61.51 150.71 

1980 06 12 10 49 23.3 59.82 151.75 

1980 06 25 07 22 19.6 59.62 150.31 

1980 06 28 18 51 49.4 62.92 151.10 

1980 06 30 18 07 39.0 60.01 141.05 

1980 06 30 18 59 31.7 60.02 141.11 

116 U.S. Geological Survey Bulletin 1840 

Mag Dep 

km 

5.0 92 

3.6 58 

4.9 49 

5.4 57 

4.7 46 

5.1 69 

4.3 66 

5.0 118 

4.4 19 

3.6 33 

3.7 117 

4.5 73 

3.3 97 

33 

4.3 124 

5.0 13 

4.9 15 

INTENSITY INFORMATION 

A Obs. Location INT Locality 

km Lat 0 N Lon °W MM 

210 64.85 147.71 3 Fairbanks 

217 61.21 149.89 3 Anchorage 

220 61.18 149.91 3 Spenard -

250 60.91 149.75 3 Hope 

256 61.01 15L33 3· Tyonek 

214 64.03 145.73 2 Delta Junction 

271 60.75 148.80 2 Whittier 

43 61.60 149.74 3 Big Lake (Village) 

5 Gunsight Mountain Lodge 

90 61.42 149.50 5 Chugiak 

4 King Mountain Lodge 

4 Mountain Lodge View 

57 61.79 148.46 4 Chickaloon 

66 61.71 148.86 4 Sutton 

71 61.60 149.08 4 Palmer 

88 61.11 146.28 4 Valdez 

88 60.75 148.80 4 Whittier 

92 61.58 149.50 4 Wasilla 

93 60.95 149.30 4 Girdwood 

112 61.21 149.89 4 Anchorage 

112 61.22 149.89 4 Eastchester 

116 60.91 149.75 4 Hope 

145 60.55 145.75 4 Cordova 

160 62.33 150.11 4 Talkeetna 

132 60.48 149.40 3 Moose Pass 

189 61.96 151.18 3 Skwentna 

193 61.01 151.33 3 Tyonek 

141 55.18 162.50 3 Cold Bay 

131 53.86 166.53 4 Unalaska 

48 51.86 176.66 3 Adak 

86 61.95 145.30 4 Copper Center 

94 61.11 146.28 4 Valdez 

103 61.71 148.86 3 Sutton 

117 61.66 149.10 3 Matanuska Valley 

174 61.21 149.89 3 Anchorage 

82 62.33 150.11 2 Talkeetna 

179 61.60 149.08 2 Palmer 

400 64.85 147.71 3 Fairbanks 

15 64.85 147.71 3 Fairbanks 

18 64.86 147.80 3 College 

75 59.63 151.55 2 Homer 

37 61.70 150.13 4 Willow 

48 61.63 149.84 4 Houston 

65 61.58 149.50 3 Wasilla 

87 61.60 149.08 3 Palmer 

24 59.63 151.55 3 Homer 

179 61.21 149.89 3 Anchorage 

194 61.33 149.63 3 Eagle River 

181 61.60 149.08 3 Palmer 

21 60.00 141.42 4 Icy Bay 

17 60.00 141.42 4 Icy Bay 

90 59.55 139.81 4 Yakutat 
I~ No. 

3120 

3121 

3122 

3123 

3124 

3125 

3126 

3127 

3 

3 

3 

3 

3 

3 

128 

129 

130 

131 

132 

133 

EARTHQUAKE PARAMETERS 

Date Time Epicent.er 

Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W 

1980 07 04 05 45 14.5 61.90 151.06 

1980 07 05 15 50 24.5 61.61 150.11 

1980 07 06 18 45 30.8 56.56 154.24 

1980 07 24 17 53 27.8 51.75 176.56 

1980 07 27 09 05 35.0 63.72 152.79 

1980 08 01 23 07 14.7 59.62 148.94 

1980 08 04 17 31 00.8 61.09 151.87 

1980 08 07 19 16 06.5 63.52 151.29 

1980 08 13 03 52 55.8 59.25 151.78 

1980 08 18 22 50 23.7 63.05 150.51 

1980 08 30 00 18 21.1 59.52 152.84 

1980 09 09 08 25 10.4 61.01 150.91 

1980 09 13 07 24 12.2 59.84 152.25 

1980 09 19 22 34 50.2 65.60 148.05 

Mag Dep 6 

km km 

4.3 80 71 

99 

3.7 49 55 

5.2 26 169 

4.1 62 14 

4.7 21 29 

119 

167 

173 

276 

5.4 26 61 

99. 

109 

185 

147 

164 

170 

186 

203 

233 

288 

126 

3.8 96 123 

132 

5.2 10 64 

118 

120 

130 

146 

211 

117 

138 

152 

174 

228 

228 

237 

242 

266 

267 

280 

291 

68 

4.0 53 44 

4.5 39 53 

55 

4.5 81 74 

62 

200 

3.6 33 59 

4.3 100 23 

46 

3.8 16 83 

INTENSITY INFORMATION 

Obs. Location INT Locality 

Lat 0 N Lon °W MM 

61.63 149.84 4 Houston 

61.21 149.89 4 Anchorage 

61.60 149.08 3 Palmer 

57.75 152.50 3 Kodiak 

51.86 176.66 3 Adak 

63.90 152.36 4 Lake Minchumina 

63.10 154.72 4 Medfra 

62.97 155.67 4 McGrath 

64.68 155.58 4 Ruby 

64.85 147.71 3 Fairbanks 

60.11 149.41 4 Seward 

60.48 149.40 4 Moose Pass 

60.49 149.83 4 Cooper Landing 

61.21 149.89 4 Anchorage 

59.63 151.55 3 Homer 

60.06 151.73 3 Ninilchik 

60.58 151.31 3 Kenai 

61.22 149.89 3 Eastchester 

61.42 149.50 3 Chugiak 

61.71 148.86 3 Sutton 

61.96 151.18 3 Skwentna 

60.75 148.80 2 Whittier 

61.33 149.63 3 Eagle River 

61.42 149.50 3 Chugiak 

63.50 150.00 4 McKinley Natl. Park 

63.38 148.95 4 Cantwell 

64.01 149.11 4 Ferry 

63.86 148.78 4 Usibelli 

62.33 150.11 4 Talkeetna 

64.83 148.15 4 Ester 

63.83 149.02 3 Healy 

64.33 149.16 3 Clear 

64.58 149.33 3 Nenana 

61.96 151.18 3 Skwentna 

64.85 147.71 3 Fairbanks 

62.97 155.67 3 McGrath 

61.71 148.86 3 Sutton 

61.60 149.08 3 Palmer 

61.22 149.89 3 Eastchester 

61.21 149.89 3 Anchorage 

64.03 145.73 3 Delta Junction 

63.03 145.58 3 Paxson 

63.90 152.36 2 Lake Minchumina 

59.63 151.55 3 Homer 

62.76 149.69 3 Gold Creek (Town) 

62.61 150.01 3 Curry 

59.63 151.55 4 Homer 

59.48 151.75 3 Seldovia 

60.49 149.83 2 Cooper Landing 

61.21 149.89 3 Anchorage 

59.77 151.87 3 Anchor Point 

59.63 151.55 3 Homer 

64.86 147.80 3 College 

Table 1-Earthquakes and Intensity Data 117 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

~· Date Time Epicenter Mag Dep ~ Obs. Location INT Locality 

0. Yr Mo Dy Hr Mn Sec Lat 0 N Lon °W km km La.c. 0 N Lon °W MM 

3133 1980 09 19 22 34 50.2 65.60 148.05 3.8 16 85 64.85 147.71 3 Fairbanks 

3134 1980 10 06 14 57 35.2 66.73 155.06 4.6 33 102 65.99 153.70 3 Indian Mountain AFS 

3135 1980 10 14 15 53 38.8 54.03 165.99 4.5 85 40 53.86 166.53 4 Unalaska 

3136 1980 10 15 09 20 12.9 55.67 161.13 5.0 24 102 55.18 162.50 4 Cold Bay 

3137 1980 10 20 00 51 64.85 147.71 3 Fairbanks 

3138 1980 10 30 03 45 26.6 62.51 149.62 80 32 62.33 150.11 3 Talkeetna 

146 61.21 149.89 3 Anchorage 

105 61.60 149.08 2 Palmer 

132 61.33 149.63 2 Eagle River 

3139 1980 11 12 09 05 19.7 59.64 153.30 145 99 59.63 151.55 2 Homer 

152 60.58 151.31 2 Kenai 

156 60.48 151.05 2 Soldotna 

3140 1980 11 21 14 56 13.4 51.80 176.14 5.6 53 36 51.86 176.66 5 Adak 

3141 1980 11 23 18 52 52.6 60.08 152.83 138 101 60.58 151.31 3 Kenai 

3142 1980 11 27 22 54 14.9 59.19 136.43 4.1 33 60 59.18 135.38 3 Haines 

3143 1980 11 30 21 31 47.3 59.43 153.28 4.9 87 140 60.24 151.38 5 Clam Gulch 

100 59.63 151.55 4 Homer 

193 57.75 152.50 4 Kodiak 

230 60.11 149.41 4 Seward 

62 59.79 154.11 3 Pedro Bay 

87 59.48 151.75 3 Seldovia 

226 60.49 149.83 3 Cooper Landing 

246 60.48 149.40 3 Moose Pass 

273 61.21 149.89 3 Anchorage 

3144 1980 12 11 22 10 57.4 60.03 152.70 118 98 60.58 151.31 3 Kenai 

104 60.48 151.05 3 Soldotna 

3145 1981 08 01 01 42 16.5 60.14 153.19 5.2 114 100 60.24 151.38 5 Clam Gulch 

235 61.33 149.63 5 Eagle River 

292 61.71 148.86 5 Sutton 

141 60.54 150.76 5 Sterling 

4 Huffman 

81 60.06 151.73 4 Ninilchik 

105 60.38 151.35 4 Kasilof 

107 59.63 151.55 4 Homer 

109 59.48 151.75 4 Seldovia 

114 60.58 151.31 4 Kenai 

117 59.35 151.82 4 Port Graham 

122 60.74 151.33 4 Nikishka 

189 60.49 149.83 4 Cooper Landing 

212 60.48 149.40 4 Moose Pass 

216 61.21 149.89 4 Anchorage 

230 61.96 151.18 4 Skwentna 

246 61.42 149.50 4 Chugiak 

296 57.52 153.99 4 Larsen Bay 

471 61.95 145.30 4 Copper Center 

65 59.79 154.11 3 Pedro Bay 

124 60.48 151.05 3 Soldotna 

140 61.01 151.33 3 Tyonek 

209 60.11 149.41 3 Seward 

216 61.23 149.90 3 Elmendorf AFB 

240 61.70 150.13 3 Willow 

249 57.93 152.50 3 Ouzinkie 

325 58.18 157.40 3 Egegik 

118 U.S. Geological Survey Bulletin 1840 
EARTHQUAKE PARAMETERS INTENSITY INFORMATION 

I~ Dat.e Time F~picent.er Mag Dep ~ Ob~. Location INT Locality 

No. Yr Mo Dy Hr Mn Sec Lat. 0 N Lon °W km km Lat oN Lon °W MM 

3145 1981 08 01 01 42 16.5 60.14 153.19 5.2 114 269 57.75 152.50 2 Kodiak 

276 61.60 149.08 2 Palmer 

Table 1-Earthquakes and Intensity Data 119 

Table 2. Earthquakes from table 1 grouped according to their maximum Modified Mercalli Intensity (lo) rating and 

listed chronologically. Explanation of column headings follows: 

Eq. No.-Consecutive earthquake identification number assigned to each event and used for cross-reference with 

tables 1 and 3. 

Date-Year, month, and day that event occurred. 

Epicenter-Identifies the geographic epicenter by latitude (N) and longitude (W), in decimal degrees. The few 

east longitudes (E) are so noted. 

Mag-Generally a body-wave (mb) magnitude, but can be an M5 , ML, or Me magnitude. Further magnitude 

information is given in table 3. 

Table 2-Maximum Intensity 121 
Io XI 

Eq.No. Year MoDy Lat 0 NLon °W Mag 

15 1899 09 10 60.00 140.00 8.6 

13'15 1958 07 10 58.60 137.10 7.9 

Io X 

Eq.No. Year MoDy Lat. 0 N Lon °W Mag 

14 1899 09 04 60.00 142.00 8.3 

1653 1964 03 28 61.04 147.73 8.3 

Io IX 

Eq.No. Year MoDy Lat. 0 N Lon °W Mag 

39 1911 09 22 60.50 149.00 6.9 

2'134 1975 02 02 53.11 173.50E 6.1 

122 U.S. Geological Survey Bulletin 1840 
I0 VIII 

!Eq.No. Year Mo Dy Lat. 0 N Lon ow Mag 

16 1900 10 09 58.00 152.00 8.3 

690 1937 07 22 64.75 146.75 7.3 

898 1947 10 16 64.50 148.80 7.0 

1139 1954 10 03 60.50 151.00 6.8 

1235 1957 03 09 51.30 175.80 8.3 

1359 1958 04 07 66.03 156.59 7.3 

2093 1968 10 29 65.40 150.10 6.0 

Io VII 

Eq.No. Year Mo Dy La.t 0 N Lon °W Mag 

7 1818 54.00 167.00 

50 1925 02 23 62.00 146.00 

51 1925 02 23 62.00 146.00 

172 1929 05 26 51.00 131.00 7.0 

293 1932 03 25 62.50 152.50 6.9 

338 1933 04 27 61.25 150.75 7.0 

1618 1963 06 24 59.50 151.70 5.7 

1912 1967 06 21 64.80 147.40 5.6 

2438 1972 07 30 56.82 135.68 6.5 

3025 1979 02 28 60.64 141.59 6.4 

Table 2-Maximum Intensity 123 
lo VI 

E_g_.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

5 1812 52.00 174.50 769 1940 07 19 61.00 150.00 

20 1903 07 26 59.00 138.00 797 1941 07 30 61.00 151.00 6.3 

22 1904 08 27 64.00 151.00 8.3 881 1946 04 01 52.75 163.50 7.4 

30 1907 12 29 66.00 168.00 1039 1952 12 07 52.50 174.20E 6.3 

31 1908 02 14 61.00 146.25 1455 1960 02 19 60.50 151.00 

32 1908 05 15 59.00 141.00 1530 1961 09 05 60.00 150.60 6.1 

33 1908 10 29 60.50 144.00 1598 1962 10 21 61.10 149.70 

34 1908 11 02 60.50 144.00 1694 1964 04 14 58.00 152.60 5.4 

40 1912 07 07 64.00 147.00 7.4 1747 1964 12 13 64.90 165.70 5.4 

41 1915 10 16 62.00 146.00 1756 1965 02 04 51.30 178.60E 6.0 

60 1925 02 24 60.00 148.00 1779 1965 04 16 64.70 160.10 5.8 

122 1927 10 24 57.50 137.00 7.1 1790 1965 07 02 53.10 167.60 6.7 

135 1928 01 25 60.00 150.00 1910 1967 06 21 64.00 144.00 

152 1928 06 21 60.00 146.50 7.0 1928 1967 06 23 64.81 147.45 4.6 

164 1929 01 21 64.00 148.00 6.3 2114 1968 12 17 60.20 152.80 5.9 

230 1931 05 30 53.00 173.00E 6.0 2442 1972 08 03 51.20 178.12 5.8 

323 1933 01 04 61.00 148.00 6.3 2505 1972 12 26 51.67 176.28 5.5 

487 1934 05 04 61.25 147.50 7.2 2747 1975 02 22 51.38 179.42 

499 1934 05 14 57.75 152.25 6.5 2844 1976 08 22 60.22 153.30 5.5 

635 1936 10 23 61.40 149.70 2883 1977 06 02 61.31 150.33 3.6 

657 1936 10 25 2917 1977 11 04 51.66 175.95 5.7 

709 1938 11 10 55.50 158.00 8.7 2973 1978 08 18 59.89 153.53 5.4 

718 1939 02 23 2990 1978 10 17 51.72 176.94 5.0 

738 1939 10 16 3047 1979 05 20 56.65 156.73 6.4 

Io V 

E_q.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

1 1786 59.00 154.00 44 1920 06 26 65.00 148.00 

2 1788 07 27 45 1922 09 21 61.00 150.00 

3 1796 05 54.00 167.00 63 1925 02 24 61.50 149.00 

4 1802 54.00 167.00 105 1926 11 15 64.20 147.00 

6 1817 04 53.00 168.00 127 1927 11 21 56.40 136.00 

8 1826 06 54.00 167.00 128 1927 11 21 57.00 136.00 

9 1899 04 02 55.50 161.00 131 1927 12 09 

11 1899 07 11 61.00 151.00 133 1927 12 31 

29 1907 09 24 59.50 135.25 137 1928 02 07 61.00 149.00 

36 1909 02 16 139 1928 02 19 61.00 147.00 

37 1909 05 06 59.50 139.50 150 1928 06 08 60.00 146.00 

42 1917 05 31 55.00 161.00 168 1929 03 07 51.00 170.00 8.6 

43 1917 12 15 57.00 136.00 170 1929 04 06 62.00 149.00 

124 U.S. Geological Survey Bulletin 1840 
lo=V-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

175 1929 08 19 58.00 153.00 766 1940 05 24 

178 1929 11 12 771 1940 08 30 65.00 148.00 

189 1930 04 20 850 1943 11 03 61.75 151.00 7.3 

229 1931 05 29 63.00 149.00 5.6 933 1949 06 19 

232 1931 06 11 942 1949 09 27 59.75 149.00 7.0 

236 1931 06 28 957 1950 08 26 65.00 162.00 6.5 

238 1931 07 06 57.50 156.00 983 1951 06 25 61.00 150.10 6.3 

239 1931 07 13 60.50 149.00 999 1952 03 09 59.50 136.00 6.0 

250 1931 10 17 63.00 147.00 5.6 1034 1952 11 21 66.00 166.00 

255 1931 11 20 1038 1952 12 06 

260 1931 11 21 60.50 149.00 1086 1953 07 18 

290 1932 03 03 60.50 149.00 1116 1954 03 03 61.50 146.50 

291 1932 03 04 1132 1954 05 16 56.50 170.00 

299 1932 04 21 1138 1954 08 23 61.00 148.50 

312 1932 09 14 61.00 148.00 6.3 1145 1954 11 03 

316 1932 10 06 59.50 151.50 1210 1956 03 31 63.00 155.50 

340 1933 04 27 59.50 151.50 1215 1956 05 18 65.00 148.00 

346 1933 04 27 61.00 150.00 1220 1956 06 09 64.00 148.00 

348 1933 04 27 1234 1957 03 09 65.00 149.00 

349 1933 04 27 1352 1958 01 13 65.00 148.00 

350 1933 04 27 1356 1958 02 16 63.00 155.00 

353 1933 04 28 1358 1958 03 31 65.50 156.00 

354 1933 04 28 1360 1958 04 09 56.50 139.00 

389 1933 05 04 1361 1958 04 11 66.00 162.50 

433 1933 07 28 54.00 166.00 1362 1958 04 13 66.00 156.00 6.8 

434 1933 08 31 59.25 137.50 5.3 1365 1958 05 05 57.50 136.50 

460 1934 02 12 58.00 134.50 1366 1958 05 10 65.23 152.01 6.4 

479 1934 04 19 61.00 150.00 1367 1958 05 10 64.50 152.50 

502 1934 05 15 1368 1958 05 11 65.10 151.94 6.4 

513 1934 06 18 60.50 151.00 6.8 1384 1958 08 31 63.27 144.23 5.9 . 521 1934 08 02 61.50 147.50 6.0 1385 1958 09 01 63.00 144.00 

548 1934 11 29 58.00 136.00 1397 1958 11 19 60.50 150.50 

592 1935 08 23 61.00 150.00 1399 1958 11 26 59.50 139.50 

593 1935 08 23 1445 1960 01 03 61.00 152.00 

667 1936 10 30 1462 1960 03 03 64.50 150.00 

689 1936 12 23 1463 1960 03 05 

694 1937 10 24 61.00 147.00 1464 1960 03 10 64.00 149.00 

715 1939 02 14 65.00 148.00 1475 1960 07 16 65.89 167.03 4.5 

732 1939 08 17 1476 1960 07 16 65.65 167.04 4.4 

733 1939 08 20 1485 1960 10 14 60.00 136.40 

744 1940 01 06 1507 1961 01 30 65.30 149.90 5.5 

748 1940 02 12 55.00 161.50 6.8 1569 1962 05 10 62.00 150.10 6.0 

749 1940 02 12 1582 1962 07 16 62.30 153.10 6.0 

752 1940 03 05 64.00 147.50 1587 1962 08 18 62.30 152.50 6.1 

756 1940 03 06 63.90 150.50 1588 1962 08 18 62.30 152.50 6.4 

Table 2-Maximum Intensity 125 
lo=V-continued 

Eq.No . Year MoDy Lat 0 NLon °W Mag Eq.No . Year MoDy Lat 0 NLon °W Mag 

1603 1962 12 13 61.40 147.20 2485 1972 10 20 

1637 1963 12 08 65.00 148.00 2496 1972 11 21 52.45 173.61E 5.5 

1643 1964 01 06 59.50 151.50 2511 1973 01 13 51.77 177.00 5.4 

1649 1964 02 06 55.70 155.80 6.9 2524 1973 03 19 52.84 173.77E 5.8 

1650 1964 02 06 55.80 155.90 5.4 2530 1973 03 27 52.58 172.87E 5.6 

1665 1964 03 28 59.80 148.70 5.8 2536 1973 04 11 64.61 160.05 4.2 

1682 1964 04 03 61.60 147.60 5.7 2554 1973 05 26 51.37 179.74 5.8 

1783 1965 04 26 54.50 162.60 5.9 2556 1973 05 29 54.01 163.76 6.0 

1822 1965 12 22 58.40 153.10 6.5 2558 1973 06 01 65.06 147.26 3.6 

1855 1966 08 26 67.10 161.50 5.2 2564 1973 06 23 51.88 176.90 5.5 

1856 1966 08 30 61.30 147.50 5.8 2569 1973 07 01 57.84 137.33 6.1 

1857 1966 08 30 61.50 147.50 5.5 2571 1973 07 03 57.98 138.02 6.0 

1889 1967 02 06 64.72 146.86 4.5 2576 1973 07 12 52.22 174.21E 5.2 

2109 1968 11 11 57.30 155.30 5.3 2624 1973 12 14 51.41 177.87 5.8 

2124 1969 02 06 51.60 176.20 5.0 2629 1974 01 24 61.59 147.63 4.8 

2140 1969 05 14 51.30 179.90 6.2 2635 1974 02 05 62.70 148.85 5.0 

2143 1969 05 18 60.30 146.00 5.4 2636 1974 02 06 53.80 164.67 5.9 

2185 1969 11 24 55.20 162.50 2644 1974 03 29 57.59 153.92 5.7 

2187 1969 12 26 55.00 162.30 2646 1974 04 06 55.10 160.44 5.7 

2191 1970 01 16 60.30 152.70 5.6 2648 1974 04 06 55.12 160.44 6.0 

2198 1970 03 11 57.50 153.90 6.0 2674 1974 07 13 62.23 151.22 4.4 

2209 1970 04 18 59.90 152.80 5.7 2675 1974 07 29 59.71 152.73 4.5 

2230 1970 08 14 64.90 147.80 5.0 2679 1974 08 13 51.53 178.11 5.8 

2260 1970 11 03 62.00 151.20 5.6 2690 1974 09 10 59.90 151.71 3.7 

2282 1971 01 25 51.47 177.69 5.9 2691 1974 09 11 60.27 151.04 4.3 

2286 1971 02 01 62.33 145.68 4.6 2703 1974 11 11 51.63 178.11 5.8 

2291 1971 02 07 51.36 176.72 6.0 2705 1974 11 15 58.84 154.45 3.8 

2313 1971 04 14 64.90 147.70 4.1 2716 1974 12 29 61.60 150.51 5.6 

2345 1971 08 05 55.65 165.00 5.2 2717 1974 12 30 61.98 149.69 5.1 

2361 1971 10 12 52.64 174.19E 4.4 2718 1975 01 01 61.91 149.74 5.9 

2369 1971 11 23 51.85 176.19 4.8 2722 1975 01 13 61.43 150.49 4.8 

2393 1972 02 21 55.90 158.27 5.7 2740 1975 02 07 52.40 174.24E 4.4 

2395 1972 02 23 2741 1975 02 09 52.82 174.49E 5.4 

2408 1972 04 06 52.05 174.98E 4.8 2775 1975 05 16 54.09 163.09 5.4 

2409 1972 04 07 60.13 152.75 5.1 2776 1975 05 18 63.17 150.26 5.4 

2412 1972 04 20 60.19 152.14 4.7 2783 1975 08 02 53.39 161.49 6.2 

2413 1972 04 21 54.01 166.85 5.8 2784 1975 08 21 60.36 151.19 4.9 

2419 1972 05 07 2793 1975 11 06 51.87 176.23E 5.4 

2422 1972 05 12 66.12 157.19 4.0 2795 1975 11 13 54.37 162.66 5.3 

2429 1972 06 19 52.19 175.03E 5.3 2810 1976 02 05 59.99 149.35 5.2 

2437 1972 07 28 52.57 173.21E 5.3 2816 1976 03 13 63.50 148.67 3.9 

2449 1972 08 04 56.20 135.34 5.6 2823 1976 04 17 64.90 148.31 4.0 

2458 1972 08 15 56.25 135.50 5.6 2824 1976 04 25 64.79 147.67 3.3 

2469 1972 09 01 51.38 178.13 5.2 2826 1976 04 27 64.73 147.58 3.0 

2480 1972 10 04 62.90 159.59 4.6 2869 1977 03 25 60.84 148.14 4.6 

126 U.S. Geological Survey Bulletin 1840 
lo=V-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

2887 1977 06 17 61.49 150.32 4.3 2998 1978 12 02 59.69 151.66 3.7 

2889 1977 07 08 61.17 150.85 4.7 3002 1978 12 15 52.11 175.23E 5.6 

2891 1977 07 11 64.56 147.27 4.5 3012 1979 01 27 54.77 161.25 6.0 

2892 1977 07 20 54.61 161.60 5.3 3021 1979 02 23 64.98 147.85 4.3 

2901 1977 08 30 63.16 151.11 5.0 3086 1979 11 14 61.38 150.09 5.1 

2911 1977 10 16 59.88 152.55 4.6 3100 1980 03 24 52.97 167.67 6.2 

2928 1977 12 27 60.39 153.70 5.1 3105 1980 04 06 61.38 147.82 4.9 

2932 1978 01 06 60.91 149.38 4.6 3140 1980 11 21 51.80 176.14 5.6 

2947 1978 04 12 56.42 152.69 6.0 3143 1980 11 30 59.43 153.28 4.9 

2971 1978 08 08 61.39 146.91 4.3 3145 1981 08 01 60.14 153.19 5.2 

2995 1978 11 19 52.70 172.48E 5.3 

lo IV 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

27 1905 12 08 61.00 162.00 266 1931 12 03 

48 1924 10 17 270 1931 12 24 60.00 152.00 6.3 

49 1924 11 29 274 1932 01 12 

'12 1925 02 25 297 1932 04 01 

80 1925 03 05 305 1932 06 06 

81 1925 03 05 310 1932 09 01 

84 1925 04 29 59.00 135.50 339 1933 04 27 

87 1925 12 23 56.00 150.00 342 1933 04 27 

93 1926 05 21 56.00 135.00 425 1933 06 19 

94 1926 05 21 436 1933 09 19 60.00 138.00 5.6 

95 1926 05 24 454 1934 01 19 

96 1926 05 25 457 1934 01 25 

110 1927 01 24 465 1934 03 30 

113 1927 03 30 62.00 150.00 467 1934 03 30 

116 1927 04 08 469 1934 04 03 

11'1 1927 04 09 4'10 1934 04 03 

118 1927 04 17 485 1934 04 29 

124 1927 10 31 486 1934 05 04 

125 1927 11 12 56.40 136.00 498 1934 05 14 

132 1927 12 31 56.40 136.00 501 1934 05 15 

142 1928 02 20 503 1934 05 15 

145 1928 04 10 60.00 150.00 515 1934 06 19 

167 1929 03 03 57.00 136.00 516 1934 06 19 

169 1929 04 06 62.00 149.00 51'1 1934 06 19 

200 1930 08 15 520 1934 07 20 

261 1931 11 22 525 1934 08 24 

Table 2-Maximum Intensity 127 
lo=IV-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

530 1934 10 11 914 1948 08 17 

536 1934 11 01 915 1948 08 19 

537 1934 11 03 917 1948 09 03 

539 1934 11 09 919 1948 11 20 

547 1934 11 28 920 1948 12 05 

569 1935 03 31 921 1949 02 23 62.00 154.00 

589 1935 08 18 923 1949 03 07 

606 1935 12 26 924 1949 03 12 61.00 147.00 

618 1936 05 29 56.80 132.70 926 1949 04 07 

634 1936 09 29 927 1949 04 08 

679 1936 11 24 934 1949 06 19 61.00 150.00 

716 1939 02 21 936 1949 07 09 

720 1939 03 07 939 1949 09 02 

724 1939 03 31 61.00 147.00 940 1949 09 03 62.00 148.00 

736 1939 09 24 943 1950 01 02 

750 1940 03 05 64.50 145.50 944 1950 01 03 

751 1940 03 05 64.50 145.50 947 1950 03 09 61.00 151.00 

758 1940 03 06 949 1950 04 22 

768 1940 06 13 950 1950 04 22 

770 1940 08 22 51.90 164.90 951 1950 05 23 

772 1940 09 13 952 1950 05 25 

774 1940 10 11 60.00 150.00 6.0 954 1950 05 25 

784 1941 03 28 955 1950 08 08 

809 1941 10 05 963 1950 10 11 63.00 160.00 

811 1941 10 27 61.00 161.00 964 1950 10 13 

830 1942 05 30 970 1951 02 13 

837 1942 12 05 991 1951 11 15 

846 1943 07 28 59.80 149.00 996 1952 01 26 52.20 178.50 

847 1943 08 25 998 1952 02 22 61.80 150.90 

863 1945 01 22 1025 1952 09 27 52.30 177.30 

877 1946 01 12 59.25 14 7.25 7.2 1027 1952 10 06 

878 1946 03 02 1028 1952 10 06 

879 1946 03 11 1033 1952 11 15 

880 1946 04 01 1041 1952 12 13 

884 1946 07 01 1042 1952 12 14 

893 1947 06 06 1045 1952 12 28 

894 1947 06 29 1046 1952 12 28 

895 1947 07 28 1047 1952 12 28 

896 1947 08 05 1048 1952 12 29 

899 1948 01 29 1051 1952 12 30 

900 1948 02 11 1053 1953 01 11 

901 1948 02 11 1054 1953 01 16 

904 1948 02 28 1060 1953 02 19 

906 1948 05 29 1081 1953 06 10 

911 1948 07 28 1088 1953 07 23 

128 U.S. Geological Survey Bulletin 1840 
lo=IV-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

1091 1953 08 28 64.00 142.00 1585 1962 08 17 

1095 1953 09 28 1586 1962 08 17 

1096 1953 09 28 1615 1963 05 08 54.90 163.80 5.8 

1103 1953 12 18 1619 1963 06 24 

1106 1953 12 18 1652 1964 03 28 

1119 1954 03 28 1657 1964 03 28 58.80 149.50 6.1 

1121 1954 04 06 1686 1964 04 12 61.20 151.10 5.0 

1122 1954 04 06 1689 1964 04 14 61.57 149.76 4.1 

1123 1954 04 06 1690 1964 04 14 61.30 147.30 5.4 

1125 1954 04 24 1691 1964 04 14 

1135 1954 07 03 1692 1964 04 14 61.40 150.80 5.1 

1146 1954 11 15 1693 1964 04 14 

1162 1955 03 01 65.30 132.90 6.8 1695 1964 04 16 61.40 149.20 4.6 

1171 1955 05 25 54.00 165.50 1722 1964 06 29 62.70 152.00 5.6 

1172 1955 05 25 54.00 165.50 1724 1964 07 25 

1178 1955 07 19 60.50 145.50 1730 1964 08 26 

1190 1955 08 31 63.50 147.00 1146 1964 11 27 62.60 151.50 5.4 

1192 1955 09 17 1766 1965 02 06 53.30 161.80 6.1 

1200 1955 12 29 59.50 154.00 1784 1965 05 11 61.40 149.60 5.5 

1202 1956 01 07 1814 1965 11 06 60.70 147.30 5.2 

1205 1956 03 02 63.50 149.50 1831 1966 02 06 60.40 152.30 5.3 

1206 1956 03 26 61.50 151.00 1843 1966 05 19 54.10 164.10 5.1 

1208 1956 03 29 1863 1966 10 07 61.70 150.10 5.6 

1211 1956 04 27 1866 1966 10 12 

1219 1956 06 09 1874 1966 11 27 

1226 1956 10 26 1878 1966 12 20 66.70 148.60 4.8 

1228 1956 11 17 54.50 134.00 6.5 1879 1966 12 20 66.70 148.80 4.9 

1321 1957 04 04 58.17 155.04 6.0 1890 1967 02 10 

1328 1957 04 25 1891 1967 02 17 

1330 1957 04 26 60.00 147.00 1895 1967 03 26 64.14 146.84 4.4 

1345 1957 11 07 1901 1967 04 21 64.65 147.17 4.0 

1354 1958 01 24 60.00 152.00 6.5 1905 1967 05 05 63.71 148.45 5.0 

1371 1958 05 11 65.00 153.50 1908 1967 06 01 53.70 165.60 5.7 

1389 1958 10 04 1911 1967 06 21 

1404 1959 01 09 1913 1967 06 21 

1410 1959 02 04 59.50 138.00 19.7 1967 07 01 54.40 158.00 6.2 

1414 1959 03 07 1950 1967 07 08 62.30 156.30 4.0 

1424 1959 07 03 58.53 151.76 1951 1967 07 08 62.30 156.30 4.0 

1440 1959 12 24 1978 1967 09 06 

1466 1960 05 13 55.00 161.50 6.3 2006 1967 11 29 

1526 1961 08 05 60.80 148.70 2014 1968 01 14 52.70 171.20 5.5 

1559 1961 12 24 65.90 150.20 2040 1968 03 10 52.10 177.30 5.4 

1564 1962 03 15 2069 1968 08 18 65.90 155.20 3.9 

1565 1962 03 26 2072 1968 09 01 64.80 147.40 

1578 1962 06 29 62.40 152.00 4.8 2085 1968 09 24 61.44 149.87 3.7 

Table 2-Maximum Intensity 129 
lo=IV-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 N Lon °W Mag 

2090 1968 10 07 61.40 150.30 4.2 2320 1971 05 02 51.43 177.21 6.0 

2099 1968 10 31 65.42 150.09 4.5 2325 1971 05 13 

2134 1969 04 09 64.80 147.50 2330 1971 06 02 61.03 151.26 5.0 

2138 1969 04 22 57.00 154.00 3.7 2333 1971 06 11 51.49 176.08E 5.9 

2152 1969 06 21 65.20 147.80 4.1 2334 1971 06 12 

2156 1969 07 17 64.10 147.60 4.9 2337 1971 06 29 54.65 161.59 5.1 

2159 1969 07 31 64.90 151.20 4.4 2339 1971 07 12 

2160 1969 08 01 2343 1971 07 26 63.28 149.73 4.1 

2162 1969 08 06 61.40 150.70 4.8 2352 1971 09 04 54.98 163.36 5.8 

2163 1969 08 25 65.10 147.40 4.0 2357 1971 09 19 

2168 1969 09 19 2359 1971 09 24 

2176 1969 10 18 52.50 173.50E 5.6 2366 1971 11 06 51.47 179.11E 6.8 

2177 1969 10 31 51.30 179.00 6.0 2367 1971 11 15 51.68 176.14 5.2 

2179 1969 11 07 62.00 150.30 3.8 2368 1971 11 22 52.27 174.32E 5.6 

2180 1969 11 16 64.10 147.50 4.4 2370 1971 11 24 52.90 159.20E 6.3 

2181 1969 11 16 64.07 147.53 4.4 2372 1971 11 29 64.82 147.34 3.1 

2182 1969 11 20 56.60 153.20 5.1 2375 1971 12 01 61.65 149.28 3.7 

2183 1969 11 21 56.37 153.60 5.2 2378 1971 12 09 

2184 1969 11 23 2382 1971 12 30 61.15 150.36 4.1 

2186 1969 11 24 56.20 153.60 5.5 2392 1972 02 15 51.41 177.45 4.9 

2188 1969 12 29 55.00 162.30 2396 1972 02 24 55.83 158.25 5.3 

2195 1970 02 18 2401 1972 03 20 51.29 179.22 6.0 

2203 1970 04 05 61.43 152.25 3.9 2403 1972 03 23 

2207 1970 04 16 59.80 142.60 5.5 2404 1972 03 24 56.14 157.18 6 .. 0 

2212 1970 05 01 63.60 149.40 4.0 2407 1972 04 05 

2213 1970 05 10 61.70 150.00 3.7 2433 1972 07 20 61.15 146.65 3.5 

2214 1970 06 02 61.60 151.70 5.5 2434 1972 07 20 

2219 1970 07 06 64.80 147.40 3.7 2446 1972 08 03 51.20 177.96 5.4 

2221 1970 07 18 51.40 178.50 5.7 2459 1972 08 15 65.15 148.75 4.3 

2222 1970 07 18 51.03 178.38 4.4 2462 1972 08 23 58.25 153.58 5.5 

2226 1970 08 02 51.70 176.90 4.0 2465 1972 08 28 51.37 179.22 5.5 

2231 1970 08 14 64.73 147.68 4.0 2478 1972 10 01 51.69 177.07 5.2 

2234 1970 08 18 64.70 147.50 3.4 2479 1972 10 02 

2235 1970 08 18 60.70 145.38 5.6 2481 1972 10 12 64.61 148.12 

2238 1970 08 29 2482 1972 10 13 51.73 175.89 4.7 

2240 1970 08 30 2483 1972 10 14 51.75 175.30 5.1 

2241 1970 09 02 64.60 150.90 4.6 2486 1972 10 21 63.15 151.06 5.4 

2242 1970 09 03 61.78 166.03 2497 1972 11 28 65.75 145.69 4.1 

2254 1970 10 26 61.50 145.90 4.7 2504 1972 12 23 51.27 179.12E 5.2 

2279 1971 01 07 52.44 173.32 5.8 2512 1973 01 13 51.74 176.98 4.7 

2298 1971 02 18 2527 1973 03 22 51.18 179.24E 4.9 

2306 1971 03 26 60.34 140.99 5.5 2531 1973 03 28 64.77 147.54 3.3 

2309 1971 04 01 60.09 149.24 4.3 2532 1973 04 02 51.94 177.40 5.2 

2317 1971 04 30 51.70 179.93E 5.2 2538 1973 04 16 51.12 178.83 5.5 

2319 1971 05 01 64.90 148.00 3.3 2543 1973 05 06 

130 U.S. Geological Survey Bulletin 1840 
lo=IV-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag tEq.No. Year MoDy Lat 0 N Lon °W Mag 

2550 1973 05 20 51.70 176.68 4.6 2'159 1975 04 13 65.34 150.09 

2552 1973 05 24 51.63 173.44 5.4 2'160 1975 04 14 57.95 156.94 4.3 

2560 1973 06 15 51.30 179.39 5.8 2'162 1975 04 16 64.93 148.71 

2562 1973 06 18 65.14 147.02 4.0 2164 1975 04 17 51.85 175.29 

2563 1973 06 19 64.79 147.55 3.8 27'10 1975 04 22 

2565 1973 06 23 64.86 147.47 2'172 1975 04 29 

25'13 1973 07 05 57.91 137.90 5.4 2'1'13 1975 05 12 51.57 176.22 4.3 

2575 1973 07 11 51.97 176.10 5.1 2'182 1975 07 25 55.06 160.38 5.8 

2580 1973 08 16 51.29 176.64 5.6 2'186 1975 09 21 

2587 1973 08 27 51.46 178.39 5.2 2'189 1975 10 22 61.69 149.88 

2597 1973 10 05 66.31 157.37 4.1 279'1 1975 12 01 61.47 149.14 3.7 

2600 1973 11 01 62.00 150.62 3.9 2'199 1975 12 21 53.16 168.97 4.3 

2601 1973 11 02 2801 1975 12 26 62.47 150.04 

2602 1973 11 02 2802 1975 12 29 62.30 148.63 

2604 1973 11 06 51.62 175.40 5.8 2806 1976 01 15 62.26 150.46 3.3 

2607 1973 11 06 51.58 175.25 5.9 2809 1976 01 23 53.52 166.49 3.7 

2615 1973 11 11 2811 1976 02 18 51.57 178.68 4.9 

261'1 1973 11 27 51.26 175.96 3.9 2813 1976 02 22 51.73 176.87 5.0 

2645 1974 03 31 51.71 177.29 4.4 2820 1976 03 26 63.60 147.65 4.1 

2651 1974 04 14 2821 1976 04 11 

2652 1974 04 15 59.19 136.43 4.2 2822 1976 04 14 62.15 150.26 3.1 

2654 1974 04 22 51.99 176.06 4.9 2825 1976 04 27 64.81 147.49 3.8 

2658 1974 05 08 63.67 150.73 4.6 2828 1976 05 08 61.62 151.52 4.4 

26'13 1974 07 13 61.49 145.01 4.7 2829 1976 05 09 59.86 153.07 4.7 

2676 1974 07 31 60.53 150.05 4.3 2838 1976 07 15 62.70 149.83 4.2 

267'1 1974 08 06 60.25 153.32 5.0 2850 1976 09 22 51.72 175.95 4.8 

2681 1974 08 16 51.50 177.83 5.7 2852 1976 10 18 63.29 150.74 4.9 

2694 1974 09 28 64.48 147.73 3.6 2855 1976 11 30 59.92 153.36 4.7 

2696 1974 10 09 285'1 1976 12 15 64.83 147.87 3.0 

269'1 1974 10 13 61.43 148.02 2859 1977 01 06 51.48 175.48 5.2 

2698 1974 10 14 2865 1977 02 19 53.57 170.03E 6.2 

2'100 1974 11 07 52.61 174.01 4.5 2866 1977 02 24 

2'101 1974 11 07 28'10 1977 03 26 52.30 168.26 5.7 

2'104 1974 11 14 58.80 154.62 5.5 28'11 1977 03 30 52.55 172.52E 5.0 

2'10'1 1974 11 28 51.87 175.27 5.2 28'14 1977 04 20 59.45 150.61 4.8 

2710 1974 11 30 53.27 172.96 5.2 28'18 1977 05 11 61.70 150.47 3.9 

2712 1974 12 10 64.75 149.05 2881 1977 05 30 52.43 169.71 5.6 

2714 1974 12 25 51.70 174.64E 5.7 2888 1977 06 29 51.77 176.22 5.0 

2726 1975 01 24 51.81 175.31 4.6 2894 1977 07 26 62.53 149.04 

2735 1975 02 02 2896 1977 08 15 51.59 176.38 4.5 

2'13'1 1975 02 02 289'1 1977 08 16 67.52 150.25 3.5 

2'139 1975 02 05 2898 1977 08 17 51.87 175.34 5.4 

2'143 1975 02 12 63.52 148.73 4.0 290'1 1977 09 17 60.86 150.84 3.7 

2756 1975 04 11 54.10 163.25 5.5 2908 1977 09 17 61.03 152.92 4.8 

2757 1975 04 12 51.53 177.75 2909 1977 09 17 64.82 147.43 4.0 

Table 2-Maximum Intensity 131 
lo=IV-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

2918 1977 11 04 51.43 175.56 5.4 3032 1979 03 27 51.82 175.33 5.0 

2920 1977 11 17 64.97 147.91 3.9 3038 1979 04 20 60.32 140.87 5.3 

2923 1977 11 20 62.43 150.66 4.9 3050 1979 05 25 52.61 167.02 6.0 

2924 1977 11 27 58.56 155.38 4.9 3054 1979 06 23 61.87 150.28 3.1 

2925 1977 12 08 59.45 151.36 4.7 3055 1979 06 23 58.03 134.91 3.8 

2931 1978 01 06 51.78 176.01 5.3 3056 1979 06 26 62.36 147.83 3.8 

2936 1978 01 18 52.92 166.43 3058 1979 07 11 55.32 134.97 5.1 

2940 1978 02 12 59.45 152.62 5.4 3060 1979 07 17 62.27 148.14 5.3 

2941 1978 02 16 61.31 144.89 4.1 3070 1979 09 01 53.98 165.20 5.8 

2945 1978 03 31 61.77 151.41 5.1 3072 1979 09 23 52.29 174.03E 5.8 

2949 1978 04 19 61.00 146.49 3.3 3073 1979 09 24 52.19 174.02E 4.8 

2952 1978 05 05 63.30 150.97 5.2 3078 1979 10 15 51.77 175.24 4.8 

2953 1978 05 11 51.67 176.10 5.6 3087 1979 11 15 61.26 150.00 3.8 

2954 1978 05 12 62.25 149.40 5.1 3088 1979 11 15 60.18 149.68 3.6 

2955 1978 05 24 51.23 179.21 6.0 3093 1980 02 08 64.68 146.87 3.3 

2957 1978 05 25 64.55 152.59 4.0 3095 1980 03 02 59.62 151.36 4.4 

2960 1978 06 10 60.30 146.45 4.8 3096 1980 03 10 54.47 162.92 4.8 

2967 1978 07 27 65.00 147.60 3.8 3101 1980 03 27 52.79 167.75 4.7 

2972 1978 08 13 62.28 149.71 4.1 3103 1980 04 03 63.15 149.57 5.0 

2980 1978 09 18 63.66 147.59 3107 1980 04 14 52.98 167.84 4.7 

2982 1978 09 20 61.92 149.23 3.8 3109 1980 05 01 61.89 146.94 4.3 

2983 1978 09 21 61.11 151.81 4.5 3114 1980 06 09 61.51 150.71 4.5 

2987 1978 10 04 51.81 177.05 4.5 3118 1980 06 30 60.01 141.05 5.0 

2999 1978 12 03 62.31 149.75 4.7 3119 1980 06 30 60.02 141.11 4.9 

3003 1978 12 17 63.95 147.42 4.8 3120 1980 07 04 61.90 151.06 4.3 

3004 1978 12 22 55.57 160.37 4.5 3124 1980 07 27 63.72 152.79 4.7 

3005 1978 12 24 63.56 157.59 5.0 3125 1980 08 01 59.62 148.94 5.4 

3010 1979 01 25 60.13 153.12 5.5 3127 1980 08 07 63.52 151.29 5.2 

3011 1979 01 27 60.96 149.38 3.6 3130 1980 08 30 59.52 152.84 4.5 

3014 1979 02 01 60.24 152.84 4.8 3135 1980 10 14 54.03 165.99 4.5 

3018 1979 02 13 55.45 157.16 5.9 3136 1980 10 15 55.67 161.13 5.0 

3029 1979 03 14 60.98 149.39 4.0 

132 U.S. Geological Survey Bulletin 1840 
Io III 

Eq.No. Year MoDy Lat 0 NLon °W Mag EQ.No. Year MoDy Lat 0 NLon °W Mag 

10 1899 06 08 155 1928 11 13 61.00 149.00 

12 1899 07 14 156 1928 11 27 60.00 148.00 

13 1899 07 1S 157 1928 12 04 54.00 166.00 

17 1900 10 11 158 1928 12 19 61.00 146.00 

18 1900 10 12 159 1928 12 24 6S.OO 148.00 

19 1900 10 13 160 1929 01 10 S4.00 161.00 

21 1903 09 10 161 1929 01 16 S4.00 161.00 

23 1904 09 10 162 1929 01 18 S8.00 1S2.00 

24 190S 02 06 163 1929 01 20 62.00 148.00 

25 190S 08 165 1929 01 2S 

26 190S 11 23 166 1929 02 26 S4.00 163.00 

28 1906 171 1929 04 06 

35 1908 12 20 173 1929 07 03 62.SO 149.00 6.3 

38 1909 07 16 174 1929 07 04 64.00 141.00 

46 1923 06 19 176 1929 09 21 S8.00 1SO.OO 

47 1924 OS 06 177 1929 09 26 61.00 146.00 

85 192S 08 10 179 1929 11 27 61.00 146.00 

86 192S 12 23 S6.00 1SO.OO 180 1929 11 27 

88 1926 02 16 181 1930 01 12 62.00 146.SO 

89 1926 02 26 182 1930 01 23 S7.SO 1S2.00 

90 1926 04 09 183 1930 02 21 

91 1926 04 18 184 1930 02 28 

92 1926 OS 14 185 1930 02 28 6S.SO 147.00 

97 1926 08 22 186 1930 03 09 S3.SO 167.00 

98 1926 08 28 187 1930 03 22 

99 1926 08 28 188 1930 04 01 

100 1926 09 11 190 1930 04 23 

101 1926 10 13 191 1930 04 30 60.00 149.00 

102 1926 10 14 192 1930 OS 14 

103 1926 10 14 193 1930 OS 26 

104 1926 11 14 194 1930 OS 26 

106 1926 11 19 195 1930 06 18 S6.SO 1S8.SO 

107 1926 12 08 196 1930 06 21 

108 1926 12 30 197 1930 06 2S 

134 1928 01 23 198 1930 08 03 

136 1928 02 02 S9.00 13S.OO 199 1930 08 13 

138 1928 02 08 60.00 1SO.OO 201 1930 09 29 

140 1928 02 20 202 1930 10 01 S8.SO 136.SO 

141 1928 02 20 203 1930 10 2S 62.00 1S7.00 

143 1928 03 02 61.00 149.00 204 1930 11 02 

144 1928 04 06 60.00 1SO.OO 205 1930 12 09 65.00 145.00 

148 1928 04 27 206 1930 12 09 

151 1928 06 20 207 1930 12 25 

153 1928 10 30 61.00 149.00 208 1930 12 26 

154 1928 10 30 61.00 149.00 209 1930 12 31 

Table 2-Maximum Intensity 133 
lo=lll-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

210 1931 01 03 265 1931 11 29 

211 1931 01 08 26'1 1931 12 05 

212 1931 01 23 268 1931 12 06 

213 1931 01 27 269 1931 12 17 

214 1931 01 27 60.75 149.00 5.6 2'11 1932 01 10 

215 1931 01 27 2'12 1932 01 10 

216 1931 01 27 2'13 1932 01 12 

21'1 1931 01 28 2'15 1932 01 14 

218 1931 01 31 276 1932 01 18 

219 1931 03 22 2'1'1 1932 01 24 

220 1931 03 23 2'18 1932 01 24 

221 1931 03 30 2'19 1932 01 24 

222 1931 04 29 280 1932 01 24 

223 1931 05 13 281 1932 01 27 

224 1931 05 13 282 1932 02 08 

225 1931 05 13 283 1932 02 08 

226 1931 05 15 284 1932 02 13 

22'1 1931 05 24 285 1932 02 15 

228 1931 05 28 286 1932 02 21 

231 1931 06 02 287 1932 02 24 

233 1931 06 13 288 1932 02 24 

234 1931 06 20 289 1932 03 01 

235 1931 06 21 292 1932 03 08 

23'1 1931 07 01 294 1932 03 26 

240 1931 07 14 295 1932 03 26 

241 1931 07 16 296 1932 03 30 

242 1931 07 18 298 1932 04 19 

243 1931 08 13 300 1932 04 26 

244 1931 08 23 301 1932 05 27 

245 1931 09 11 302 1932 06 02 

246 1931 09 15 303 1932 06 05 

24'1 1931 10 12 304 1932 06 06 

248 1931 10 17 306 1932 06 06 

249 1931 10 17 307 1932 06 07 

251 1931 10 20 308 1932 06 08 63.00 155.00 

252 1931 10 26 309 1932 06 08 

253 1931 10 27 311 1932 09 03 

254 1931 11 04 :us 1932 10 03 

256 1931 11 20 314 1932 10 06 

25'1 1931 11 20 315 1932 10 06 

258 1931 11 20 31'1 1932 10 12 

259 1931 11 20 318 1932 10 12 

262 1931 11 25 319 1932 11 17 

263 1931 11 26 320 1932 11 19 

264 1931 11 27 821 1932 12 06 

134 U.S. Geological Survey Bulletin 1840 
lo=lll-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

322 1932 12 10 378 1933 05 01 

324 1933 01 04 61.00 148.00 879 1933 05 02 

325 1933 01 17 880 1933 05 02 

326 1933 03 02 881 1933 05 02 

327 1933 03 02 382 1933 05 02 

328 1933 03 17 888 1933 05 02 

329 1933 03 18 384 1933 05 03 

330 1933 03 19 385 1933 05 03 

331 1933 03 21 386 1933 05 03 

332 1933 03 28 58.25 149.00 5.6 387 1933 05 04 

333 1933 04 02 388 1933 05 04 

334 1933 04 19 890 1933 05 04 

335 1933 04 22 891 1933 05 04 

336 1933 04 26 392 1933 05 05 

337 1933 04 27 898 1933 05 05 

341 1933 04 27 894 1933 05 06 

343 1933 04 27 395 1933 05 06 

344 1933 04 27 896 1933 05 06 

345 1933 04 27 397 1933 05 06 

347 1933 04 27 398 1933 05 06 

351 1933 04 27 399 1933 05 07 

352 1933 04 28 400 1933 05 07 

355 1933 04 28 401 1933 05 08 

356 1933 04 28 402 1933 05 08 

357 1933 04 28 403 1933 05 13 

358 1933 04 28 404 1933 05 15 

359 1933 04 28 405 1933 05 15 

360 1933 04 28 406 1933 05 16 

361 1933 04 29 40'1 1933 05 18 

362 1933 04 29 408 1933 05 19 

363 1933 04 29 409 1933 05 22 

364 1933 04 29 410 1933 05 23 

365 1933 04 29 411 1933 05 25 

366 1933 04 29 412 1933 06 12 

367 1933 04 29 413 1933 06 12 

368 1933 04 30 414 1933 06 12 61.50 150.50 5.6 

369 1933 04 30 415 1933 06 13 

370 1933 04 30 416 1933 06 13 

371 1933 04 30 41'1 1933 06 13 61.00 151.00 6.3 

372 1933 04 30 418 1933 06 14 

373 1933 04 30 419 1933 06 15 

374 1933 04 30 420 1933 06 16 

375 1933 05 01 421 1933 06 17 

376 1933 05 01 422 1933 06 17 

87'1 1933 05 01 423 1933 06 17 

Table 2-Maximum Intensity 135 
lo=lll-continued 

Eq.No. Year MoDy Lat 0 N Lon °W Mag Eq.No. Year MoDy Lat 0 N Lon °W Mag 

424 1933 06 19 482 1934 04 24 

426 1933 06 19 61.25 150.50 6.0 483 1934 04 24 

427 1933 06 19 484 1934 04 28 

428 1933 06 28 53.50 165.00 488 1934 05 04 

429 1933 06 28 489 1934 05 04 

430 1933 06 28 490 1934 05 04 

431 1933 06 28 53.50 165.00 6.0 491 1934 05 04 

432 1933 06 29 53.50 165.00 492 1934 05 04 

435 1933 08 31 493 1934 05 04 

438 1933 09 24 494 1934 05 05 

439 1933 09 24 495 1934 05 14 

440 1933 09 27 496 1934 05 14 

441 1933 09 27 497 1934 05 14 

442 1933 09 29 500 1934 05 15 

443 1933 10 11 504 1934 05 26 

444 1933 11 06 505 1934 05 29 

445 1933 11 07 506 1934 05 30 

446 1933 11 11 507 1934 06 02 61.25 147.00 6.3 

447 1933 11 24 508 1934 06 04 

448 1933 11 28 509 1934 06 12 

449 1933 12 05 510 1934 06 15 

450 1933 12 18 511 1934 06 17 

451 1933 12 29 512 1934 06 18 

452 1934 01 15 514 1934 06 18 

453 1934 01 19 518 1934 07 14 

455 1934 01 20 519 1934 07 16 

456 1934 01 20 522 1934 08 02 

458 1934 02 11 523 1934 08 02 

459 1934 02 12 524 1934 08 18 

461 1934 03 06 526 1934 09 15 

462 1934 03 20 527 1934 09 22 

463 1934 03 26 528 1934 10 04 

464 1934 03 30 529 1934 10 06 

466 1934 03 30 531 1934 10 15 

468 1934 04 02 532 1934 10 18 

471 1934 04 06 533 1934 10 28 

472 1934 04 07 534 1934 10 28 

473 1934 04 08 535 1934 10 29 

474 1934 04 08 538 1934 11 07 

475 1934 04 08 540 1934 11 09 

476 1934 04 10 541 1934 11 09 

477 1934 04 10 542 1934 11 10 

478 1934 04 13 543 1934 11 12 

480 1934 04 19 544 1934 11 20 

481 1934 04 21 545 1934 11 22 

136 U.S. Geological Survey Bulletin 1840 
lo=lll-continued 

lEq.No. Year MoDy Lat 0 N Lon °W Ma~ Eq.No. Year MoDy Lat 0 NLon °W Mag 

546 1934 11 22 597 1935 09 24 

549 1934 11 30 598 1935 10 13 

550 1934 11 30 599 1935 10 26 

551 1934 12 19 600 1935 11 06 

552 1934 12 20 601 1935 11 07 

553 1934 12 22 602 1935 11 17 

554 1934 12 22 603 1935 12 19 

555 1934 12 28 604 1935 12 25 

556 1934 12 29 605 1935 12 25 

557 1934 12 29 607 1936 01 22 

558 1934 12 29 608 1936 01 31 

559 1935 01 02 609 1936 02 04 

560 1935 01 05 610 1936 03 03 

561 1935 01 05 611 1936 03 04 

562 1935 01 07 612 1936 03 10 

563 1935 01 13 618 1936 03 11 

564 1935 01 23 52.25 169.50 6.8 614 1936 03 12 

565 1935 01 24 615 1936 04 10 

566 1935 01 29 616 1936 04 16 

567 1935 02 24 617 1936 05 08 61.00 153.00 5.8 

568 1935 03 31 619 1936 05 30 

570 1935 04 09 620 1936 05 30 

571 1935 04 10 621 1936 06 02 

572 1935 04 10 622 1936 06 22 

573 1935 04 11 628 1936 06 22 

514 1935 04 19 624 1936 06 22 

575 1935 04 21 625 1936 06 23 

576 1935 04 21 626 1936 06 29 

577 1935 05 19 627 1936 07 03 

578 1935 05 29 628 1936 07 03 

579 1935 06 12 629 1936 07 04 

580 1935 06 20 680 1936 08 27 

581 1935 07 06 59.00 139.00 631 1936 09 09 

582 1935 07 06 632 1936 09 19 

583 1935 07 14 633 1936 09 19 

584 1935 08 04 636 1936 10 23 

585 1935 08 04 637 1936 10 23 

586 1935 08 05 638 1936 10 23 

587 1935 08 15 689 1936 10 23 

588 1935 08 15 640 1936 10 23 

590 1935 08 23 641 1936 10 23 

591 1935 08 23 642 1936 10 23 

594 1935 08 28 643 1936 10 23 

595 1935 09 04 644 1936 10 23 

596 1935 09 22 645 1936 10 23 

Table 2-Maximum Intensity 137 
lo=lll-continued 

IEq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

646 1936 10 23 697 1937 12 07 

647 1936 10 23 698 1937 12 11 

648 1936 10 23 699 1938 02 25 

649 1936 10 23 700 1938 02 25 

650 1936 10 23 701 1938 02 26 

651 1936 10 23 702 1938 02 26 

652 1936 10 23 703 1938 03 17 

653 1936 10 24 704 1938 03 17 

654 1936 10 24 705 1938 03 23 

655 1936 10 25 706 1938 04 16 

656 1936 10 25 707 1938 04 18 

658 1936 10 25 708 1938 06 11 

659 1936 10 26 710 1938 11 15 

660 1936 10 26 711 1938 12 30 

661 1936 10 26 712 1939 01 09 

662 1936 10 27 713 1939 01 12 

663 1936 10 28 714 1939 01 25 

664 1936 10 29 717 1939 02 22 

665 1936 10 29 719 1939 03 05 

666 1936 10 29 721 1939 03 27 

668 1936 10 30 722 1939 03 27 

669 1936 11 02 723 1939 03 28 65.20 148.00 

670 1936 11 03 725 1939 03 31 

671 1936 11 05 726 1939 04 01 

672 1936 11 05 727 1939 04 01 

673 1936 11 11 728 1939 04 27 

674 1936 11 11 729 1939 04 28 

675 1936 11 14 730 1939 07 10 62.50 148.00 

676 1936 11 16 731 1939 08 07 

677 1936 11 16 734 1939 09 02 

678 1936 11 17 735 1939 09 11 

680 1936 11 25 737 1939 10 05 

681 1936 11 29 739 1939 11 04 

682 1936 11 29 740 1939 12 17 

683 1936 12 13 741 1939 12 19 

684 1936 12 15 742 1940 01 03 

685 1936 12 16 743 1940 01 06 

686 1936 12 20 745 1940 01 07 

687 1936 12 22 146 1940 01 27 

688 1936 12 22 747 1940 01 27 

691 1937 09 03 52.50 177.50 7.3 753 1940 03 06 

692 1937 09 28 58.60 137.70 754 1940 03 06 

693 1937 10 01 755 1940 03 06 

695 1937 11 24 757 1940 03 06 

/696 1937 11 30 759 1940 03 06 

138 U.S. Geological Survey Bulletin 1840 
lo=lll-continued 

lEq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 N Lon °W Mag 

760 1940 03 06 817 1941 12 08 

761 1940 03 07 818 1941 12 14 

762 1940 03 09 819 1941 12 20 

763 1940 03 23 820 1941 12 29 

164 1940 04 12 821 1941 12 29 

765 1940 05 04 822 1941 12 29 

767 1940 06 12 823 1942 01 01 

773 1940 09 22 824 1942 01 01 

776 1941 01 12 825 1942 01 30 

777 1941 01 22 826 1942 04 13 

778 1941 02 02 827 1942 05 19 

779 1941 02 07 828 1942 05 19 

780 1941 03 02 829 1942 05 19 

781 1941 03 05 831 1942 06 05 

782 1941 03 05 832 1942 07 21 

783 1941 03 05 833 1942 09 10 

785 1941 03 31 834 1942 09 14 

786 1941 04 21 53.00 166.00 835 1942 09 18 

787 1941 04 30 836 1942 11 19 

788 1941 05 01 838 1942 12 14 

789 1941 05 17 839 1943 02 15 

790 1941 05 18 840 1943 02 17 

791 1941 06 11 841 1943 04 03 

792 1941 06 13 842 1943 04 09 

793 1941 07 01 843 1943 05 02 

794 1941 07 21 844 1943 05 19 

795 1941 07 25 845 1943 07 06 

796 1941 07 26 848 1943 09 27 

798 1941 07 30 849 1943 11 02 

799 1941 07 30 851 1943 11 12 

800 1941 07 30 852 1943 11 14 

801 1941 08 10 853 1943 12 30 

802 1941 08 10 854 1944 01 26 

803 1941 08 12 855 1944 01 29 

804 1941 08 31 856 1944 02 26 

805 1941 09 15 857 1944 02 26 

806 1941 09 19 858 1944 02 28 

807 1941 09 21 859 1944 07 18 

808 1941 09 23 860 1944 07 30 

810 1941 10 15 861 1944 10 20 

812 1941 10 28 862 1945 01 18 

813 1941 11 01 864 1945 02 09 

814 1941 11 15 865 1945 02 11 

815 1941 12 06 866 1945 03 06 

816 1941 12 08 867 1945 04 12 

Table 2-Maximum Intensity 139 
lo=lll-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag 1EQ.No. Year MoDy Lat 0 N Lou 0 W Mag 

868 1945 06 03 956 1950 08 13 51.50 177.00 

869 1945 09 18 958 1950 08 27 65.00 162.00 

8'10 1945 10 10 959 1950 08 27 65.00 162.00 

8'11 1945 10 15 960 1950 08 27 

8'12 1945 10 15 961 1950 09 24 64.00 156.00 

8'18 1945 11 15 59.00 138.00 962 1950 09 28 54.50 134.50 

8'14 1945 11 17 965 1950 11 22 51.50 176.50 6.8 

8'15 1945 11 18 966 1950 12 26 

8'16 1945 12 02 96'1 1951 01 17 

882 1946 04 19 968 1951 01 23 

888 1946 06 26 969 1951 02 08 

885 1946 08 29 9'11 1951 02 25 

886 1946 10 19 9'12 1951 03 07 

88'1 1946 10 30 61.00 149.00 9'13 1951 03 15 

888 1947 01 02 9'14 1951 03 15 

889 1947 02 03 9'15 1951 03 28 

890 1947 02 03 9'16 1951 03 30 

891 1947 02 03 9'1'1 1951 03 31 

892 1947 04 30 9'18 1951 03 31 

89'1 1947 08 28 9'19 1951 04 03 

902 1948 02 14 980 1951 04 09 

908 1948 02 14 981 1951 05 08 

905 1948 05 03 982 1951 05 14 

90'1 1948 06 21 984 1951 07 20 

908 1948 06 21 985 1951 07 20 

909 1948 06 26 986 1951 08 17 

910 1948 07 15 98'1 1951 09 12 

912 1948 07 28 988 1951 09 26 

913 1948 08 01 989 1951 09 27 

916 1948 08 30 990 1951 11 04 

918 1948 10 09 992 1951 11 24 

922 1949 02 26 993 1951 12 30 62.00 148.80 

925 1949 04 03 994 1951 12 31 

928 1949 04 11 995 1952 01 01 

929 1949 04 12 66.50 153.00 99'1 1952 02 02 51.40 179.20 

930 1949 04 12 1000 1952 05 09 

931 1949 05 12 1001 1952 05 18 

935 1949 06 20 1002 1952 05 22 

93'1 1949 08 27 1008 1952 05 23 

938 1949 08 31 62.00 153.00 1004 1952 06 14 

941 1949 09 15 1005 1952 06 16 

945 1950 01 30 61.50 150.00 1006 1952 06 28 

946 1950 02 24 100'1 1952 06 28 

948 1950 04 05 52.00 177.00 1008 1952 06 29 

953 1950 05 25 65.50 151.50 6.0 1009 1952 07 18 

140 U.S. Geological Survey Bulletin 1840 
lo=lll-contin ued 

IEQ.No. Year MoDy Lat 0 NLon °W Mag IEQ.No. Year MoDy Lat 0 NLon °W Mag 

1010 1952 07 25 1072 1953 05 08 

1011 1952 07 28 10'13 1953 05 12 52.30 177.30 

1012 1952 07 29 53.50 175.00 1074 1953 05 15 52.25 171.75 

1013 1952 08 07 1075 1953 05 20 

1014 1952 08 10 52.80 173.20 1076 1953 05 21 

1015 1952 08 13 1077 1953 05 23 

1016 1952 08 14 1078 1953 05 28 

1017 1952 08 14 1079 1953 05 28 

1018 1952 08 15 1080 1953 06 09 

1019 1952 08 16 1082 1953 06 20 

1020 1952 08 17 1083 1953 06 20 

1021 1952 08 17 1084 1953 06 27 

1022 1952 08 18 1085 1953 07 05 51.00 178.50 

1023 1952 08 18 1087 1953 07 20 

1024 1952 08 28 1089 1953 07 26 

1026 1952 09 28 58.50 137.00 1090 1953 07 31 

1029 1952 10 09 1092 1953 09 13 

1030 1952 10 10 1093 1953 09 21 

1031 1952 10 23 1094 1953 09 22 

1032 1952 11 05 1097 1953 10 09 

1035 1952 11 29 1098 1953 10 14 

1036 1952 12 05 1099 1953 10 15 

1037 1952 12 05 1100 1953 10 23 

1040 1952 12 07 1101 1953 12 04 

1043 1952 12 15 1102 1953 12 15 

1044 1952 12 26 1104 1953 12 18 

1049 1952 12 29 1105 1953 12 18 

1050 1952 12 29 1107 1954 01 07 

1052 1953 01 05 53.00 171.50E 7.1 1108 1954 01 14 

1055 1953 01 17 1109 1954 01 20 

1056 1953 01 29 1110 1954 01 20 

1057 1953 01 30 1111 1954 01 21 

1058 1953 02 05 1112 1954 01 21 

1059 1953 02 14 1113 1954 02 19 

1061 1953 02 19 1114 1954 03 03 

1062 1953 02 22 1115 1954 03 03 

1063 1953 03 06 58.50 156.50 1117 1954 03 03 

1064 1953 03 17 1118 1954 03 04 

1065 1953 04 10 1120 1954 03 31 

1066 1953 04 11 1124 1954 04 17 51.50 179.00 6.8 

1067 1953 04 13 1126 1954 04 24 63.00 148.00 

1068 1953 04 19 50.50 179.00 1127 1954 04 24 

1069 1953 04 22 1128 1954 04 29 

1070 1953 04 25 1129 1954 04 29 

1071 1953 05 05 1130 1954 05 11 

Table 2-Maximum Intensity 141 
lo=lll-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag !Eq.No. Year MoDy Lat 0 NLon °W Mag 

1131 1954 05 12 1186 1955 08 11 

1133 1954 06 24 1187 1955 08 11 

1134 1954 06 27 1188 1955 08 15 

1136 1954 07 30 1189 1955 08 16 

1137 1954 08 17 1191 1955 09 16 

1140 1954 10 04 1193 1955 10 08 

1141 1954 10 10 1194 1955 10 08 

1142 1954 10 10 1195 1955 10 28 58.50 138.00 

1143 1954 10 10 1196 1955 11 14 

1144 1954 10 22 1197 1955 12 10 

1147 1954 11 16 1198 1955 12 18 

1148 1954 11 21 1199 1955 12 21 

1149 1954 11 27 1201 1956 01 07 

1150 1954 11 28 1203 1956 01 20 

1151 1954 12 02 1204 1956 02 24 

1152 1954 12 10 1207 1956 03 29 

1153 1954 12 13 1209 1956 03 30 

1154 1954 12 13 1212 1956 04 28 

1155 1954 12 30 53.00 168.00 6.6 1213 1956 04 29 

1156 1955 01 13 53.00 167.50 6.9 1214 1956 05 07 

1157 1955 01 13 53.00 167.50 6.5 1216 1956 05 19 

1158 1955 01 21 53.00 168.00 1217 1956 05 19 

1159 1955 02 13 1218 1956 05 19 

1160 1955 02 27 1221 1956 08 18 

1161 1955 02 28 1222 1956 09 01 

1163 1955 03 30 1223 1956 09 01 

1164 1955 04 11 1224 1956 09 28 

1165 1955 04 18 1225 1956 09 29 

1166 1955 04 28 51.00 178.50 6.5 1227 1956 11 17 

1167 1955 05 14 59.50 151.50 1229 1956 12 07 

1168 1955 05 14 61.00 148.00 1230 1956 12 25 

1169 1955 05 15 1231 1956 12 25 

1170 1955 05 21 1232 1956 12 25 

1173 1955 05 29 1233 1956 12 25 

1174 1955 07 08 1236 1957 03 09 65.00 149.00 

1175 1955 07 11 1237 1957 03 09 50.50 177.00 

1176 1955 07 16 1238 1957 03 09 51.00 176.00 

1177 1955 07 17 54.00 168.00 5.9 1239 1957 03 09 51.50 174.00 

1179 1955 07 19 60.50 146.00 1240 1957 03 09 51.50 172.50 

1180 1955 07 24 1241 1957 03 09 51.00 173.00 

1181 1955 07 31 1242 1957 03 10 51.60 174.40 6.6 

1182 1955 08 05 1243 1957 03 10 51.50 174.00 

1183 1955 08 05 1244 1957 03 10 52.00 174.00 

1184 1955 08 08 1245 1957 03 10 52.00 176.00 

1185 1955 08 09 1246 1957 03 10 51.00 177.00 

142 U.S. Geological Survey Bulletin 1840 
lo=lll-continued 

IEq.No. Year MoDy Lat 0 NLon °W Mag EQ.No. Year MoDy Lat 0 N Lon °W Mag 

1247 1957 03 10 51.50 173.60 6.8 1292 1957 03 17 51.00 178.50 

1248 1957 03 10 51.50 173.50 1293 1957 03 17 51.00 179.00 

1249 1957 03 10 51.00 177.00 1294 1957 03 18 51.00 179.50 

1250 1957 03 10 52.00 173.00 1295 1957 03 18 51.50 179.00 

1251 1957 03 11 51.20 176.70 6.9 1296 1957 03 18 52.00 180.00 

1252 1957 03 11 51.50 177.00 1297 1957 03 19 

1253 1957 03 11 50.50 177.00 1298 1957 03 19 52.00 175.50 

1254 1957 03 11 51.00 177.00 1299 1957 03 19 51.60 176.67 

1255 1957 03 11 51.00 177.00 1300 1957 03 19 51.50 175.00 6.8 

1256 1957 03 11 51.50 178.50 1301 1957 03 20 52.00 173.00 

1257 1957 03 11 50.50 178.00 1302 1957 03 20 51.50 175.50 

1258 1957 03 11 51.51 178.75 6.8 1303 1957 03 20 52.00 172.00 

1259 1957 03 11 51.10 179.00 6.5 1304 1957 03 20 51.50 174.50 

1260 1957 03 11 52.00 173.00 1305 1957 03 21 52.00 173.00 

1261 1957 03 12 52.00 174.50 1306 1957 03 21 51.00 175.00 

1262 1957 03 12 52.00 173.00 1307 1957 03 21 51.50 177.00 

1263 1957 03 12 51.70 174.10 6.4 1308 1957 03 23 51.50 179.00 

1264 1957 03 12 51.00 178.20 6.4 1309 1957 03 23 51.00 179.50 

1265 1957 03 12 51.20 177.20 1310 1957 03 24 51.00 179.50 

1266 1957 03 12 51.50 174.50 1311 1957 03 24 51.00 179.50 

1267 1957 03 12 51.39 176.90 7.3 1312 1957 03 25 52.00 176.00 

1268 1957 03 12 51.50 175.00 1313 1957 03 26 51.00 177.50 

1269 1957 03 12 51.00 178.00 1314 1957 03 26 51.00 179.50 

1270 1957 03 12 52.00 174.00 1315 1957 03 28 51.50 174.50 

1271 1957 03 13 51.85 171.07 1316 1957 03 30 51.50 179.50 

1272 1957 03 13 51.40 175.30 1317 1957 03 30 51.50 178.00 

1273 1957 03 13 51.40 178.40 1318 1957 03 30 51.95 175.16 6.2 

1274 1957 03 13 51.00 177.00 1319 1957 03 31 51.51 178.47 6.1 

1275 1957 03 13 52.00 173.00 1320 1957 04 03 51.50 177.00 

1276 1957 03 13 51.50 177.00 1322 1957 04 04 

1277 1957 03 13 51.30 178.50 6.8 1323 1957 04 05 51.50 178.50 

1278 1957 03 13 51.00 175.00 1324 1957 04 08 

1279 1957 03 14 51.00 178.00 1325 1957 04 22 

1280 1957 03 14 51.32 176.44 7.2 1326 1957 04 24 

1281 1957 03 14 51.50 177.50 132'1 1957 04 25 

1282 1957 03 14 51.00 178.00 1329 1957 04 25 60.50 145.00 

1283 1957 03 14 51.50 176.00 1331 1957 06 01 

1284 1957 03 15 51.00 176.00 1332 1957 06 01 59.50 150.50 

1285 1957 03 15 51.00 173.00 1333 1957 06 06 

1286 1957 03 15 51.50 177.00 1334 1957 06 13 

1287 1957 03 16 51.50 175.00 1335 1957 06 18 

1288 1957 03 16 51.57 178.86 6.8 1336 1957 06 23 57.92 137.71 5.6 

1289 1957 03 16 52.00 174.00 1337 1957 07 16 

1290 1957 03 16 51.00 177.00 1338 1957 07 25 

1291 1957 03 17 51.00 180.00 1839 1957 08 13 61.00 148.00 

Table 2-Maximum Intensity 143 
lo=lll-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag IEQ.No. Year MoDy La.t 0 N Lon °W Mag 

1340 1957 08 18 1406 1959 01 21 

1341 1957 08 27 140'1 1959 01 25 

1342 1957 10 04 1408 1959 01 30 

1343 1957 10 04 1409 1959 02 03 60.00 151.00 

1344 1957 10 11 1411 1959 02 09 

1346 1957 11 22 1412 1959 02 18 

134'1 1957 12 03 1413 1959 02 19 

1348 1957 12 10 1415 1959 03 19 61.50 148.00 

1349 1957 12 20 1416 1959 03 25 

1350 1958 01 07 141'1 1959 04 12 

1351 1958 01 10 1418 1959 05 14 

1353 1958 01 20 59.60 151.70 1419 1959 06 04 59.50 153.00 5.5 

1355 1958 02 05 1420 1959 06 07 

135'1 1958 03 05 1421 1959 06 09 

1363 1958 04 18 1422 1959 06 09 

1364 1958 04 25 1423 1959 06 09 

1369 1958 05 11 65.00 151.50 1425 1959 07 17 60.50 153.50 

13'10 1958 05 11 65.00 152.50 1426 1959 07 23 

13'12 1958 05 13 142'1 1959 07 25 

13'13 1958 05 13 1428 1959 08 01 

13'14 1958 07 08 1429 1959 08 01 

13'16 1958 07 13 58.91 136.99 5.6 1430 1959 08 02 

13'1'1 1958 07 13 1431 1959 08 02 

13'18 1958 07 13 1432 1959 08 27 

13'19 1958 07 16 1433 1959 08 28 63.50 149.00 

1380 1958 07 17 57.50 137.00 1434 1959 08 29 

1381 1958 07 18 58.50 138.50 1435 1959 08 30 

1382 1958 07 31 61.50 151.00 1436 1959 11 02 59.00 152.00 

1383 1958 08 17 51.38 176.23 143'1 1959 11 30 59.50 152.00 

1386 1958 09 02 1438 1959 12 03 59.50 152.00 

138'1 1958 09 07 1439 1959 12 15 

1388 1958 09 11 1441 1959 12 26 59.50 151.50 6.3 

1390 1958 10 05 1442 1959 12 27 

1391 1958 10 07 1443 1959 12 29 

1392 1958 10 08 1444 1960 01 02 

1393 1958 10 20 51.90 175.15 1446 1960 01 13 

1394 1958 10 26 144'1 1960 01 16 

1395 1958 10 27 1448 1960 01 16 63.00 151.00 

1396 1958 11 05 1449 1960 01 17 

1398 1958 11 23 1450 1960 01 19 

1400 1958 11 29 1451 1960 01 27 

1401 1958 11 29 1452 1960 02 07 

1402 1958 12 11 1453 1960 02 16 

1403 1958 12 22 66.00 147.00 6.0 1454 1960 02 19 

1405 1959 01 09 1456 1960 02 19 

144 U.S. Geological Survey Bulletin 1840 
lo=lll-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

1457 1960 02 26 51.50 178.00 6.1 1510 1961 02 07 51.70 177.10 

1458 1960 02 27 51.50 178.00 1511 1961 02 17 

1459 1960 02 27 51.50 178.00 1512 1961 03 01 

1460 1960 03 01 1513 1961 03 14 67.80 164.90 

1461 1960 03 03 1514 1961 03 28 51.70 176.20 6.3 

1465 1960 03 30 51.00 178.50 1515 1961 03 28 52.00 176.00 

1467 1960 05 16 1516 1961 04 04 

1468 1960 05 23 1517 1961 04 27 

1469 1960 06 17 52.50 173.50 6.1 1518 1961 04 29 

1470 1960 06 30 60.00 151.00 1519 1961 05 17 52.20 173.90E 6.0 

1471 1960 07 03 1520 1961 05 26 

1472 1960 07 03 50.50 177.00 6.9 1521 1961 06 13 

1473 1960 07 10 1522 1961 06 15 

1474 1960 07 16 1523 1961 07 05 

1477 1960 07 18 1524 1961 07 09 

1478 1960 08 02 51.70 178.40 1525 1961 07 12 

1479 1960 08 04 51.20 179.00E 6.1 1527 1961 08 18 

1480 1960 08 10 1528 1961 08 23 

1481 1960 09 04 1529 1961 08 29 

1482 1960 09 12 60.50 153.80 1531 1961 09 05 

1483 1960 09 20 1532 1961 09 05 

1484 1960 09 20 1533 1961 09 05 

1486 1960 10 23 1534 1961 09 05 

1487 1960 10 30 1535 1961 09 06 

1488 1960 11 10 1536 1961 09 06 

1489 1960 11 17 1537 1961 09 06 

1490 1960 11 17 1538 1961 09 07 

1491 1960 11 18 1539 1961 09 07 

1492 1960 11 23 1540 1961 09 07 

1493 1960 11 25 1541 1961 09 12 63.40 149.40 

1494 1960 12 02 1542 1961 09 25 

1495 1960 12 03 52.70 177.40 1543 1961 09 25 60.50 153.00 5.9 

1496 1960 12 07 62.70 151.50 1544 1961 09 28 

1497 1960 12 09 1545 1961 10 12 

1498 1960 12 21 1546 1961 10 16 

1499 1960 12 21 61.50 152.90 5.8 1547 1961 10 27 

1500 1960 12 21 1548 1961 10 27 

1501 1960 12 22 1549 1961 10 30 

1502 1961 01 05 51.80 176.30 6.8 1550 1961 11 19 51.30 178.50 

1503 1961 01 05 51.50 176.60 1551 1961 11 19 

1504 1961 01 06 1552 1961 11 22 51.70 177.10 

1505 1961 01 16 1553 1961 12 03 

1506 1961 01 18 1554 1961 12 05 

1508 1961 02 05 50.90 176.90 1555 1961 12 05 

1509 1961 02 06 51.70 174.50 5.4 1556 1961 12 06 

Table 2-Maximum Intensity 145 
lo=lll-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag EQ.No. Year MoDy Lat 0 NLon °W Mag 

1557 1961 12 11 1614 1963 05 07 

1558 1961 12 19 1616 1963 05 12 57.30 154.00 6.1 

1560 1961 12 24 161'1 1963 06 23 

1561 1961 12 25 60.90 147.70 1620 1963 07 08 57.00 134.50 3.7 

1562 1962 02 27 63.00 150.00 1621 1963 07 27 

1563 1962 02 28 51.60 179.60 1622 1963 08 10 49.60 179.20E 4.3 

1566 1962 03 28 1623 1963 08 15 

156'1 1962 04 06 1624 1963 09 01 

1568 1962 04 14 59.60 152.10 1625 1963 09 29 

1570 1962 05 21 1626 1963 10 04 

15'11 1962 05 22 162'1 1963 10 07 

15'12 1962 05 29 51.80 177.10 1628 1963 10 12 

15'13 1962 06 13 1629 1963 10 15 59.00 136.80 4.3 

15'14 1962 06 18 60.50 153.70 1630 1963 10 16 

15'15 1962 06 20 1631 1963 10 18 

1576 1962 06 21 1632 1963 10 18 62.60 146.60 4.2 

157'1 1962 06 22 1633 1963 10 24 

15'19 1962 07 06 60.30 152.10 1634 1963 11 04 

1580 1962 07 09 1635 1963 11 04 

1581 1962 07 15 1636 1963 12 05 

1583 1962 08 15 51.80 177.00 1638 1963 12 09 

1584 1962 08 16 1639 1963 12 11 51.20 179.30E 5.3 

1589 1962 08 30 1640 1963 12 20 

1590 1962 08 31 51.30 179.70 6.8 1641 1963 12 23 

1591 1962 09 01 51.30 179.70 6.5 1642 1964 01 04 

1592 1962 09 01 51.30 179.90 1644 1964 01 08 51.40 179.00 4.2 

1593 1962 09 14 1645 1964 01 12 53.20 166.30 5.5 

1594 1962 09 15 1646 1964 01 20 

1595 1962 09 23 60.10 151.20 164'1 1964 01 24 60.40 146.50 3.7 

1596 1962 09 25 1648 1964 01 26 

159'1 1962 10 20 1651 1964 03 03 

1599 1962 11 08 1654 1964 03 28 

1600 1962 11 12 1655 1964 03 28 

1601 1962 12 12 1656 1964 03 28 59.80 149.40 6.1 

1602 1962 12 13 63.30 149.70 1658 1964 03 28 57.40 151.70 5.7 

1604 1963 03 14 1659 1964 03 28 57.50 151.60 5.4 

1605 1963 03 24 1660 1964 03 28 57.20 152.40 6.0 

1606 1963 03 29 1661 1964 03 28 60.30 146.60 5.4 

160'1 1963 04 01 1662 1964 03 28 56.50 154.00 6.1 

1608 1963 04 03 1663 1964 03 28 57.80 152.10 4.9 

1609 1963 04 11 51.90 176.20 4.4 1664 1964 03 28 57.80 151.30 4.8 

1610 1963 04 28 1666 1964 03 29 

1611 1963 04 30 166'1 1964 03 29 57.00 151.70 5.2 

1612 1963 05 01 1668 1964 03 29 

1618 1963 05 03 1669 1964 03 29 56.80 152.40 4.8 

146 U.S. Geological Survey Bulletin 1840 
lo=lll-continued 

1

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

1670 1964 03 29 1726 1964 08 02 56.20 149.90 5.4 

1671 1964 03 29 56.70 152.70 4.6 1727 1964 08 11 

1672 1964 03 29 56.10 154.50 4.8 1728 1964 08 11 

1673 1964 03 29 56.50 152.60 4.9 1729 1964 08 14 

1674 1964 03 29 1731 1964 08 30 

1675 1964 03 29 60.00 149.10 4.9 1732 1964 09 13 61.40 149.80 3.9 

1676 1964 03 30 1733 1964 09 16 60.00 147.10 

1677 1964 03 30 56.30 154.40 5.0 1734 1964 09 16 60.00 147.10 5.5 

1678 1964 03 30 56.40 152.50 5.2 1735 1964 09 23 61.60 150.00 4.1 

1679 1964 03 30 58.00 151.60 5.0 1736 1964 09 24 

1680 1964 03 30 56.50 152.70 5.3 1737 1964 09 28 61.00 147.40 4.5 

1681 1964 03 30 57.40 152.30 5.1 1738 1964 10 18 60.30 152.30 4.1 

1683 1964 04 04 56.90 152.70 5.9 1739 1964 10 27 

1684 1964 04 04 59.40 145.20 5.1 1740 1964 11 01 

1685 1964 04 10 1741 1964 11 07 

1687 1964 04 13 59.40 143.90 4.9 1742 1964 11 07 

1688 1964 04 13 56.60 .152.10 5.1 1743 1964 11 20 63.70 146.50 4.6 

1696 1964 04 16 59.50 147.80 4.5 1744 1964 11 23 

1697 1964 04 17 1745 1964 11 27 65.30 151.40 4.2 

1698 1964 04 20 61.40 147.30 5.7 1748 1964 12 17 51.40 177.90 5.5 

1699 1964 04 20 61.50 147.30 5.0 1749 1964 12 20 52.10 177.10 4.3 

1700 1964 04 21 1750 1964 12 29 

1701 1964 04 21 61.50 147.40 5.4 1751 1965 01 03 60.20 151.20 5.6 

1702 1964 04 25 1752 1965 01 04 59.90 153.60 5.4 

1703 1964 04 26 1753 1965 01 06 60.00 151.80 5.2 

1704 1964 04 29 58.20 150.70 1754 1965 01 07 

1705 1964 04 30 1755 1965 01 27 

1706 1964 04 30 1757 1965 02 04 50.90 177.70E 5.0 

1707 1964 05 03 1758 1965 02 04 

1708 1964 05 07 1759 1965 02 04 

1709 1964 05 12 1760 1965 02 04 

1710 1964 05 15 61.40 147.90 3.7 1761 1965 02 04 

1711 1964 05 21 1762 1965 02 04 

1712 1964 05 21 60.20 147.20 4.2 1763 1965 02 06 53.20 161.90 6.4 

1713 1964 05 21 59.00 153.50 5.3 1764 1965 02 06 

1714 1964 05 22 1765 1965 02 06 

1715 1964 05 25 1767 1965 02 12 

1716 1964 05 28 53.70 167.80 4.7 1768 1965 02 18 51.40 179.10E 5.4 

1717 1964 05 29 60.20 146.30 5.6 1769 1965 02 24 

1718 1964 06 02 59.70 144.40 5.1 1770 1965 03 16 52.10 175.00E 4.9 

1719 1964 06 05 60.40 146.00 5.2 1771 1965 03 17 51.10 178.30 4.2 

1720 1964 06 10 1772 1965 03 17 

1721 1964 06 12 1773 1965 03 17 52.80 171.90E 6.0 

1723 1964 07 23 59.90 149.20 5.4 1774 1965 03 23 

1725 1964 07 27 60.90 148.00 4.2 1775 1965 03 28 

Table 2-Maximum Intensity 147 
lo=lll-continued 

!Eq.No. Year MoDy Lat 0 NLon °W Mag !Eq.No. Year MoDy Lat 0 NLon °W Mag 

1776 1965 03 30 50.60 177.90E 7.3 1827 1966 01 21 

1777 1965 03 31 1828 1966 01 24 51.70 176.30 4.5 

1778 1965 04 10 50.80 175.80E 5.1 1829 1966 01 28 51.90 177.10 5.4 

1780 1965 04 17 52.60 173.10E 5.1 1830 1966 01 29 

1781 1965 04 20 52.40 172.00E 5.5 1832 1966 02 16 58.20 152.20 3.9 

1782 1965 04 26 1833 1966 02 24 51.80 177.30 4.2 

1785 1965 05 27 1834 1966 03 03 61.40 150.60 4.0 

1786 1965 06 01 65.10 147.00 4.0 1835 1966 03 08 

1787 1965 06 12 1836 1966 03 09 51.70 177.10 4.6 

1788 1965 06 24 1837 1966 03 13 

1789 1965 06 26 51.40 178.60 5.2 1838 1966 03 25 56.60 135.40 4.7 

1791 1965 07 06 59.90 149.30 3.9 1839 1966 04 22 57.40 152.30 5.9 

1792 1965 07 08 1840 1966 05 03 51.60 176.70 4.7 

1793 1965 07 13 1841 1966 05 14 51.90 177.70 5.9 

1794 1965 07 15 61.80 148.80 3.8 1842 1966 05 15 51.40 178.40 5.7 

1795 1965 07 27 51.20 177.60E 5.4 1844 1966 06 04 

1796 1965 07 29 50.90 171.40 6.3 1845 1966 06 22 61.30 147.70 5.2 

1797 1965 08 08 51.80 175.20 5.3 1846 1966 06 28 

1798 1965 09 03 1847 1966 07 04 51.90 179.80E 6.0 

1799 1965 09 04 58.20 152.70 6.2 1848 1966 07 07 

1800 1965 09 05 51.80 176.30 4.2 1849 1966 07 19 51.70 173.30 5.4 

1801 1965 09 08 57.50 152.20 5.6 1850 1966 07 22 51.70 173.50 5.4 

1802 1965 09 09 60.10 153.20 3.9 1851 1966 08 07 50.60 171.20 6.2 

1803 1965 09 23 59.80 152.30 3.9 1852 1966 08 17 52.20 175.00E 5.5 

1804 1965 10 01 50.10 178.20E 6.3 1853 1966 08 24 51.90 176.20 4.2 

1805 1965 10 07 51.70 176.00 4.7 1854 1966 08 26 

1806 1965 10 10 51.80 175.40 5.2 1858 1966 09 01 

1807 1965 10 12 52.10 174.80 5.1 1859 1966 09 01 61.70 149.70 5.1 

1808 1965 10 12 51.90 176.40 4.1 1860 1966 09 08 52.80 173.40E 5.0 

1809 1965 10 15 1861 1966 10 02 51.60 174.60 5.1 

1810 1965 10 15 1862 1966 10 05 52.30 173.90 4.8 

1811 1965 10 16 65.20 164.20 4.4 1864 1966 10 08 

1812 1965 10 24 52.10 176.10 4.9 1865 1966 10 08 61.30 150.50 3.7 

1813 1965 10 25 51.50 178.50 4.0 1867 1966 10 12 

1815 1965 11 08 51.60 177.00 4.3 1868 1966 10 20 51.40 176.60 5.1 

1816 1965 11 22 51.90 176.10 5.6 1869 1966 11 14 

1817 1965 11 23 51.40 179.70 5.6 1870 1966 11 17 51.40 176.30 4.6 

1818 1965 11 23 51.40 179.60 4.2 1871 1966 11 17 51.30 176.30 4.8 

1819 1965 11 24 63.20 150.90 5.0 1872 1966 11 20 51.40 176.50 5.3 

1820 1965 12 01 1873 1966 11 21 51.80 179.90E 4.6 

1821 1965 12 12 51.50 178.90 5.2 1875 1966 12 11 52.90 176.00 5.1 

1823 1965 12 30 54.10 164.30 5.7 1876 1966 12 14 52.80 177.60 5.2 

1824 1965 12 30 58.20 152.40 5.3 1877 1966 12 16 61.40 149.50 4.1 

1825 1966 01 18 61.40 151.90 4.1 1880 1966 12 24 59.80 153.40 5.0 

1826 1966 01 18 61.50 150.70 4.1 1881 1966 12 25 51.80 176.10E 4.8 

148 U.S. Geological Survey Bulletin 1840 
lo=lll-continued 

!Eq.No. Year MoDy Lat 0 NLon °W Mag IE<J.No. Year MoDy Lat 0 NLon °W Mag 

1882 1966 12 26 64.60 147.60 3.8 1943 1967 06 28 

1883 1967 01 02 1944 1967 06 28 

1884 1967 01 07 51.86 175.15 4.5 1945 1967 06 28 64.80 147.50 3.8 

1885 1967 01 07 51.91 176.63 4.3 1946 1967 06 29 51.70 177.00 4.6 

1886 1967 01 18 60.48 152.44 4.5 1948 1967 07 06 62.40 147.40 5.1 

1887 1967 01 28 52.38 169.52 5.9 1949 1967 07 07 

1888 1967 02 06 60.15 152.77 4.9 1952 1967 07 12 51.80 175.00 4.5 

1892 1967 02 24 51.79 176.94 4.2 1953 1967 07 16 

1893 1967 02 28 64.92 148.71 1954 1967 07 16 

1894 1967 03 20 60.44 149.58 4.2 1955 1967 07 17 

1896 1967 03 31 63.12 148.50 4.5 1956 1967 07 19 

1898 1967 04 04 60.23 148.51 4.1 1957 1967 07 24 

1899 1967 04 12 56.12 136.12 4.6 1958 1967 07 24 65.70 152.20 

1900 1967 04 17 1959 1967 07 25 

1902 1967 04 29 51.44 178.32 5.9 1960 1967 07 26 

1904 1967 05 01 1961 1967 07 27 52.00 176.20 4.4 

1906 1967 05 08 62.15 149.84 3.8 1962 1967 08 04 

1907 1967 05 19 51.70 176.92 4.7 1963 1967 08 05 

1909 1967 06 08 1964 1967 08 08 

1914 1967 06 21 64.73 147.42 3.9 1965 1967 08 12 

1915 1967 06 22 64.90 147.10 4.1 1966 1967 08 12 

1916 1967 06 22 64.80 147.50 3.8 1967 1967 08 12 

1917 1967 06 22 51.70 176.80 5.3 1968 1967 08 14 

1919 1967 06 22 3.8 1969 1967 08 17 59.40 151.40 5.0 

1920 1967 06 22 64.80 147.30 4.1 1970 1967 08 18 61.50 151.00 4.5 

1921 1967 06 22 1971 1967 08 20 

1922 1967 06 22 3.6 1972 1967 08 23 

1923 1967 06 23 1973 1967 08 23 

1924 1967 06 23 1974 1967 08 26 

1926 1967 06 23 1975 1967 08 28 

1927 1967 06 23 1976 1967 08 30 

1929 1967 06 23 3.9 1977 1967 09 03 60.50 151.60 4.7 

1930 1967 06 23 5.0 197'9 1967 09 08 

1931 1967 06 23 1980 1967 09 09 

1932 1967 06 23 3.5 1981 1967 09 11 

1933 1967 06 23 1982 1967 09 16 52.00 176.40 5.4 

1934 1967 06 23 1983 1967 09 19 

1935 1967 06 23 64.83 147.31 3.5 1984 1967 09 21 

1936 1967 06 24 64.78 147.50 3.9 1985 1967 09 22 

1937 1967 06 25 3.6 1986 1967 09 25 

1938 1967 06 25 64.76 147.38 3.3 1987 1967 09 26 

1939 1967 06 25 1988 1967 09 28 59.50 147.10 5.6 

1940 1967 06 25 1989 1967 10 02 

1941 1967 06 26 4.1 1990 1967 10 10 52.30 176.10 5.0 

1942 1967 06 27 1991 1967 10 10 64.80 147.20 

Table 2-Maximum Intensity 149 
lo=lll-continued 

IEQ.No. Year MoDy Lat 0 NLon °W MaR Eq.No. Year MoDy Lat 0 NLon °W Mag 

1992 1967 10 11 63.00 151.10 4.6 2039 1968 03 05 64.80 147.30 

1993 1967 10 25 60.80 150.40 2041 1968 03 13 51.70 176.80 4.8 

1994 1967 10 28 64.80 147.70 2042 1968 03 15 64.70 147.30 

1995 1967 10 29 2043 1968 03 17 

1996 1967 10 30 2044 1968 03 22 

1997 1967 11 01 2045 1968 04 01 64.80 147.20 

1998 1967 11 10 62.30 151.40 4.9 2046 1968 04 08 

1999 1967 11 16 2047 1968 04 17 

2000 1967 11 18 2048 1968 04 23 58.70 150.00 6.3 

2001 1967 11 21 2049 1968 04 24 60.90 147.50 3.9 

2002 1967 11 22 2050 1968 05 08 61.90 148.70 

2003 1967 11 24 2051 1968 05 09 61.40 149.80 

2004 1967 11 25 52.00 175.20 3.9 2052 1968 05 15 

2005 1967 11 27 60.30 140.80 4.6 2053 1968 05 16 

2007 1967 12 04 2054 1968 05 18 61.20 147.60 4.3 

2008 1967 12 12 65.00 147.30 2055 1968 05 28 

2009 1967 12 13 65.10 147.30 2056 1968 05 29 62.30 149.10 4.0 

2010 1967 12 15 2057 1968 06 13 

2011 1967 12 19 2058 1968 06 15 61.00 146.90 4.9 

2012 1967 12 19 51.70 176.90 4.8 2059 1968 06 23 

2013 1968 01 09 64.90 146.60 2060 1968 07 02 65.00 147.70 

2015 1968 02 18 51.70 177.70 4.2 2061 1968 07 05 60.90 147.00 4.1 

2016 1968 02 20 60.00 142.00 3.9 2062 1968 07 13 

2017 1968 02 20 58.40 151.70 4.9 2063 1968 07 13 

2018 1968 02 21 52.30 175.30 5.2 2064 1968 07 16 64.90 147.20 

2019 1968 02 21 52.30 175.30 5.3 2065 1968 07 26 

2020 1968 02 21 51.40 176.10 4.7 2066 1968 08 08 

2021 1968 02 21 51.60 176.00 4.7 2067 1968 08 11 52.10 179.90 5.5 

2022 1968 02 21 51.70 175.90 4.8 2068 1968 08 14 60.20 153.00 4.6 

2023 1968 02 21 51.40 176.00 5.2 2070 1968 08 31 64.70 147.40 3.8 

2024 1968 02 21 51.40 175.80 4.4 2071 1968 09 01 

2025 1968 02 21 51.70 176.00 4.2 2073 1968 09 01 

2026 1968 02 22 2074 1968 09 01 64.79 147.35 

2027 1968 02 22 51.40 176.30 5.1 2075 1968 09 02 

2028 1968 02 23 51.50 176.30 4.6 2076 1968 09 02 64.70 147.50 4.0 

2029 1968 02 23 51.60 177.20 4.5 2077 1968 09 08 64.80 147.60 4.5 

2030 1968 02 23 51.60 175.90 4.5 2078 1968 09 17 64.70 147.60 3.7 

2031 1968 02 23 51.50 176.30 4.6 2079 1968 09 17 51.90 176.20 4.3 

2032 1968 02 23 51.90 179.10 5.2 2080 1968 09 18 64.80 147.60 4.1 

2033 1968 02 23 2081 1968 09 20 

2034 1968 02 25 51.40 176.00 5.3 2082 1968 09 21 

2035 1968 02 27 2083 1968 09 22 

2036 1968 02 28 2086 1968 09 24 

2037 1968 02 28 2087 1968 09 28 64.80 147.40 3.5 

2038 1968 03 03 64.70 147.80 2088 1968 09 29 

150 U.S. Geological Survey Bulletin 1840 
lo=lll-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

2089 1968 10 03 51.60 174.10 5.0 2155 1969 07 03 51.70 178.00E 5.1 

2091 1968 10 24 64.70 147.40 2158 1969 07 17 63.98 147.48 4.2 

2092 1968 10 26 64.80 147.50 2161 1969 08 04 51.40 179.60 5.3 

2094 1968 10 29 65.55 150.26 4.2 2164 1969 08 27 60.10 153.00 4.5 

2095 1968 10 29 65.64 150.00 3.9 2165 1969 09 12 51.30 179.20 5.0 

2096 1968 10 30 65.58 150.13 4.0 2166 1969 09 12 51.22 179.15 6.0 

2097 1968 10 30 65.55 150.11 4.0 2167 1969 09 15 51.90 175.50E 5.2 

2098 1968 10 30 65.40 150.00 3.9 216.9 1969 09 26 60.10 153.00 4.7 

2100 1968 10 31 2170 1969 09 29 51.70 177.10 4.4 

2101 1968 10 31 65.50 150.00 4.0 2171 1969 10 04 62.20 149.80 3.7 

2102 1968 11 02 64.90 149.40 4.4 2172 1969 10 10 64.80 147.20 3.9 

2103 1968 11 03 65.60 149.90 4.4 2173 1969 10 10 64.72 147.23 4.0 

2104 1968 11 03 65.64 150.06 3.9 2174 1969 10 10 60.50 148.70 3.8 

2105 1968 11 03 65.62 149.89 2175 1969 10 16 62.50 151.30 4.0 

2106 1968 11 03 2178 1969 11 06 51.50 178.90 5.5 

2107 1968 11 07 54.30 164.60 5.1 2189 1970 01 06 3.5 

2108 1968 11 11 61.60 150.10 2190 1970 01 16 

2110 1968 11 13 2192 1970 01 16 

2113 1968 12 13 62.00 147.90 3.8 2193 1970 01 22 

2115 1968 12 19 2194 1970 02 06 

2117 1968 12 28 63.00 148.20 4.6 2196 1970 02 27 50.10 179.60 6.0 

2118 1968 12 29 61.70 152.20 4.5 2197 1970 02 28 52.70 175.10 6.1 

2119 1968 12 30 57.60 151.40 5.4 2200 1970 03 19 51.30 173.80E 5.8 

2120 1969 01 03 61.00 151.00 2201 1970 03 27 

2122 1969 01 05 64.80 147.40 2204 1970 04 07 61.80 150.00 

2123 1969 02 05 64.81 147.24 2205 1970 04 11 59.70 142.70 5.2 

2125 1969 02 15 2206 1970 04 11 

2126 1969 03 04 59.97 152.75 2208 1970 04 16 59.85 142.56 4.1 

2127 1969 03 09 64.80 147.70 2210 1970 04 19 59.60 142.80 5.8 

2128 1969 03 14 65.40 150.10 4.4 2211 1970 04 25 65.50 150.00 3.2 

2130 1969 03 21 59.90 152.70 4.5 2215 1970 06 09 64.90 148.80 4.1 

2132 1969 04 01 55.80 161.30 4.6 2216 1970 06 19 

2133 1969 04 09 67.10 162.30 4.2 2217 1970 06 19 60.30 151.50 3.8 

2135 1969 04 10 2218 1970 07 04 61.50 149.40 3.8 

2136 1969 04 15 64.80 147.40 2220 1970 07 13 60.40 152.00 4.8 

2137 1969 04 19 60.30 146.00 5.1 2223 1970 07 19 3.3 

2139 1969 05 14 61.20 149.80 3.9 2224 1970 07 20 

2145 1969 05 28 60.30 145.80 3.3 2225 1970 07 30 60.60 148.60 4.7 

2147 1969 06 09 62.40 149.00 4.1 2232 1970 08 15 

2148 1969 06 11 59.60 144.80 5.3 2233 1970 08 16 

2149 1969 06 11 59.59 144.76 4.9 2236 1970 08 24 

2150 1969 06 18 59.50 145.00 5.2 2237 1970 08 28 

2151 1969 06 19 54.20 164.00 5.0 2239 1970 08 29 

2153 1969 06 22 51.50 179.90 6.1 2243 1970 09 03 64.60 150.90 3.9 

2154 1969 06 22 51.58 179.97 4.9 2245 1970 09 19 60.90 151.50 4.6 

Table 2-Maximum Intensity 151 
lo=lll-continued 

Eq.No . Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

2247 1970 09 23 2358 1971 09 20 

2248 1970 09 23 64.79 147.75 2360 1971 09 30 51.31 178.78E 5.0 

2249 1970 10 04 51.60 178.90E 3.5 2364 1971 10 29 60.22 153.46 4.7 

2251 1970 10 11 2373 1971 11 30 51.11 179.54E 5.0 

2252 1970 10 16 62.00 146.60 3.9 2376 1971 12 03 51.63 177.18 4.7 

2253 1970 10 21 62.40 151.10 2379 1971 12 17 55.10 161.18 4.5 

2255 1970 10 26 2380 1971 12 23 60.66 151.57 3.7 

2257 1970 10 31 62.19 148.68 4.2 2385 1972 01 14 64.69 147.61 4.1 

2259 1970 11 01 60.30 154.20 4.4 2386 1972 01 15 

2261 1970 11 03 62.03 150.69 3.7 2387 1972 01 23 52.03 178.67 4.9 

2262 1970 11 13 2388 1972 01 30 51.80 176.59 4.4 

2264 1970 11 14 2397 1972 02 25 61.16 149.41 3.5 

2266 1970 11 21 2399 1972 03 14 59.99 147.70 4.4 

2267 1970 11 30 59.70 150.60 4.0 2400 1972 03 19 62.41 150.58 3.2 

2273 1970 12 20 63.10 151.40 5.3 2402 1972 03 21 50.01 176.17 5.4 

2274 1970 12 24 51.50 178.30 5.3 2405 1972 04 02 

2276 1970 12 28 61.60 149.60 3.8 2406 1972 04 05 

2277 1971 01 05 61.42 147.55 4.5 2410 1972 04 16 63.53 147.71 4.1 

2278 1971 01 05 3.5 2411 1972 04 17 51.55 177.37 4.6 

2281 1971 01 16 2415 1972 04 25 61.98 148.82 4.6 

2283 1971 01 25 3.0 2416 1972 04 27 

2284 1971 01 26 51.67 174.92 5.4 2421 1972 05 08 64.75 147.50 

2285 1971 01 29 2425 1972 06 06 51.58 178.27 5.3 

2287 1971 02 02 62.23 151.15 3.5 2426 1972 06 09 

2288 1971 02 03 2427 1972 06 12 53.35 166.79 5.8 

2289 1971 02 03 2428 1972 06 14 60.50 153.41 5.2 

2290 1971 02 04 2430 1972 06 19 52.05 175.15E 4.7 

2292 1971 02 07 51.36 176.72 2432 1972 07 18 

2293 1971 02 07 51.20 177.10 5.8 2439 1972 07 30 

2299 1971 02 23 2444 1972 08 03 51.21 177.87 4.8 

2308 1971 03 30 51.19 177.49 5.7 2445 1972 08 03 51.21 178.15 5.5 

2310 1971 04 02 61.44 150.09 3.7 2452 1972 08 07 

2311 1971 04 09 51.52 178.78E 4.9 2454 1972 08 08 51.26 177.95 4.9 

2315 1971 04 16 64.60 147.13 4.2 2457 1972 08 12 51.38 179.32 5.9 

2316 1971 04 24 3.2 2464 1972 08 27 

2321 1971 05 02 51.54 177.21 5.3 2466 1972 08 28 

2322 1971 05 03 2473 1972 09 14 

2324 1971 05 10 2476 1972 09 24 

2340 1971 07 15 54.22 133.73 5.2 2484 1972 10 15 51.78 175.35 4.9 

2341 1971 07 25 2487 1972 10 23 

2347 1971 08 10 65.47 149.96 4.3 2488 1972 10 25 61.30 150.50 3.2 

2349 1971 08 21 54.28 162.49 5.2 2489 1972 10 27 61.52 150.35 3.7 

2353 1971 09 06 64.79 147.68 3.2 2491 1972 10 30 51.97 177.55 4.1 

2355 1971 09 18 51.89 178.63E 4.6 2493 1972 11 02 64.56 147.63 3.7 

2356 1971 09 19 51.77 176.94 4.2 2494 1972 11 13 53.79 169.04 5.1 

152 U.S. Geological Survey Bulletin 1840 
lo=lll-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

2495 1972 11 17 56.04 135.53 5.0 2699 1974 11 04 

2502 1972 12 18 2715 1974 12 28 

2503 1972 12 22 2719 1975 01 01 61.41 150.06 3.8 

2507 1973 01 05 2720 1975 01 08 52.40 175.55 5.1 

2508 1973 01 09 60.31 146.00 5.1 2728 1975 01 27 61.28 149.81 3.9 

2514 1973 01 16 54.12 165.54 5.3 2730 1975 01 28 61.35 149.97 3.7 

2519 1973 02 08 61.76 150.18 3.8 2751 1975 04 02 51.62 178.29 4.9 

2522 1973 03 11 64.83 147.81 3.0 2761 1975 04 14 

2526 1973 03 21 64.84 147.83 2763 1975 04 16 

2528 1973 03 23 51.30 174.22E 5.8 2765 1975 04 18 61.81 150.56 3.5 

2539 1973 04 22 51.13 179.84 4.8 2766 1975 04 18 52.93 173.34E 4.6 

2541 1973 04 30 60.95 151.13 3.4 2767 1975 04 20 

2542 1973 04 30 51.60 177.79E 4.8 2780 1975 07 08 51.55 178.29 5.0 

2544 1973 05 10 51.37 179.52 5.3 2787 1975 09 29 51.55 177.87 4.2 

2547 1973 05 20 2790 1975 10 23 61.73 150.12 

2548 1973 05 20 2791 1975 10 28 61.42 152.42 4.5 

2549 1973 05 20 2794 1975 11 07 

2561 1973 06 15 51.27 179.42 5.4 2796 1975 11 30 52.30 176.27 4.8 

2566 1973 06 25 61.67 150.06 3.4 2803 1976 01 07 61.86 150.67 

2568 1973 06 30 52.75 172.26E 5.4 2815 1976 03 08 51.34 178.04 4.7 

2570 1973 07 01 57.78 137.29 5.2 2817 1976 03 13 63.51 148.70 3.3 

2572 1973 07 04 64.77 147.53 3.2 2818 1976 03 21 60.87 149.69 

2574 1973 07 08 2819 1976 03 25 57.01 153.71 5.0 

2581 1973 08 16 51.30 176.64 5.2 2827 1976 04 27 64.73 147.58 3.0 

2582 1973 08 16 51.45 176.63. 5.6 2830 1976 05 11 61.49 146.97 4.2 

2584 1973 08 22 62.62 149.25 3.6 2831 1976 05 26 57.97 153.30 4.5 

2585 1973 08 22 57.07 154.10 5.9 2834 1976 06 14 51.47 176.85 4.1 

2586 1973 08 26 51.25 179.26 5.2 2835 1976 06 24 61.97 150.90 4.8 

2591 1973 08 31 61.10 147.41 5.1 2841 1976 08 11 51.70 175.42 4.6 

2592 1973 09 06 61.04 146.83 5.5 2845 1976 08 25 60.61 150.17 

2596 1973 09 20 2846 1976 08 28 52.60 175.34 5.1 

2598 1973 10 05 4.4 2849 1976 09 21 57.84 152.12 4.9 

2599 1973 10 08 4.4 2851 1976 09 27 60.46 145.17 4.0 

2606 1973 11 06 61.62 150.02 2853 1976 10 24 62.65 149.14 4.9 

2608 1973 11 06 51.79 175.31 4.5 2856 1976 12 15 61.35 150.25 3.7 

2613 1973 11 09 2860 1977 01 13 59.43 142.23 4.5 

2620 1973 12 09 58.40 151.85 4.2 2861 1977 01 18 61.39 146.56 3.2 

2622 1973 12 14 51.32 178.30 5.2 2862 1977 01 25 60.98 149.99 3.5 

2626 1974 01 01 2867 1977 03 03 51.75 175.97 4.1 

2655 1974 04 25 2868 1977 03 18 3.6 

2660 1974 05 13 2872 1977 04 12 60.80 149.22 4.4 

2664 1974 05 27 60.33 146.02 5.5 2873 1977 04 18 4.1 

2682 1974 08 20 52.24 174.97E 5.6 2877 1977 05 05 64.84 148.36 3.7 

2683 1974 08 22 2879 1977 05 12 

2693 1974 09 27 61.58 149.95 3.7 2880 1977 05 25 67.38 150.30 

Table 2-Maximum Intensity 153 
lo=lll-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 N Lon °W Mag 

2884 1977 06 06 62.16 149.55 4.1 3028 1979 03 14 59.79 151.92 3.4 

2885 1977 06 12 61.63 146.15 4.2 3030 1979 03 24 61.53 149.93 

2886 1977 06 17 58.27 151.82 4.0 3031 1979 03 26 

2890 1977 07 08 62.33 150.10 3.7 3033 1979 03 27 60.49 148.98 2.9 

2893 1977 07 22 61.03 150.40 3.8 3034 1979 04 02 64.81 147.43 3.1 

2910 1977 10 03 65.15 146.84 3.3 3035 1979 04 04 60.32 153.59 4.5 

2913 1977 10 19 62.88 150.56 5.0 3039 1979 04 25 63.35 149.50 3.9 

2922 1977 11 17 61.29 149.40 3040 1979 04 25 64.88 148.83 3.3 

2926 1977 12 15 61.37 150.01 3.0 3041 1979 04 28 64.61 149.46 3.0 

2929 1977 12 29 61.65 146.38 4.3 3042 1979 05 05 62.97 148.23 4.6 

2930 1978 01 05 61.33 151.65 4.4 3043 1979 05 09 61.93 148.92 2.9 

2933 1978 01 09 62.00 148.82 3.5 3044 1979 05 13 

2935 1978 01 10 64.74 147.44 2.8 3046 1979 05 18 64.41 147.08 3.2 

2937 1978 01 22 60.24 152.33 3048 1979 05 20 62.83 149.17 

2938 1978 01 27 60.37 151.12 4.7 3052 1979 05 31 61.74 149.88 3.4 

2939 1978 01 28 60.07 151.33 4.5 3053 1979 06 20 60.88 147.69 3.3 

2944 1978 03 20 59.84 153.24 3.8 3059 1979 07 16 60.86 153.02 4.6 

2946 1978 04 09 60.69 151.84 4.5 3064 1979 08 04 62.49 149.77 4.1 

2951 1978 04 24 51.64 176.09 5.2 3065 1979 08 07 51.32 176.11 4.6 

2956 1978 05 24 51.13 179.20 5.2 3066 1979 08 10 61.97 150.94 4.3 

2961 1978 06 12 59.86 150.76 4.0 3067 1979 08 27 4.0 

2962 1978 06 22 51.61 179.41 4.8 3068 1979 08 29 61.91 150.80 3.9 

2964 1978 07 16 63.57 150.52 3.5 3069 1979 08 31 54.39 161.84 5.1 

2966 1978 07 23 63.31 147.26 5.0 3071 1979 09 14 

2968 1978 07 27 64.85 147.59 3.6 3074 1979 09 26 3.2 

2969 1978 07 27 64.93 148.02 3.7 3075 1979 09 27 3.1 

2970 1978 08 03 59.78 151.15 3076 1979 10 07 61.22 150.43 3.1 

2981 1978 09 19 61.34 147.18 3.9 3077 1979 10 10 56.15 135.75 4.4 

2985 1978 09 26 64.99 147.55 3.7 3080 1979 10 18 51.86 177.13E 6.0 

2986 1978 09 28 63.99 147.71 4.4 3082 1979 10 27 59.38 152.90 4.1 

2988 1978 10 04 50.93 173.53E 5.3 3083 1979 10 28 59.86 151.67 3.6 

2989 1978 10 06 61.93 150.67 4.6 3084 1979 11 02 51.16 178.05 4.8 

2992 1978 10 30 60.96 150.32 3.3 3085 1979 11 07 60.59 150.68 3.5 

3006 1979 01 04 61.73 150.04 3.4 3090 1980 01 04 61.66 147.44 3.7 

3009 1979 01 25 63.32 151.16 3.5 3091 1980 01 19 51.32 178.49 5.8 

3013 1979 01 31 51.72 175.81 5.0 3092 1980 02 03 64.65 149.55 3.0 

3015 1979 02 06 60.72 151.77 3094 1980 02 13 64.95 147.72 

3016 1979 02 07 61.03 150.15 3.0 3098 1980 03 13 64.97 147.57 3.1 

3017 1979 02 09 60.06 152.59 4.8 3099 1980 03 17 59.99 153.14 4.9 

3020 1979 02 17 62.31 149.50 4.9 3102 1980 03 28 53.00 167.62 4.9 

3022 1979 02 23 3104 1980 04 03 61.60 150.56 3.6 

3023 1979 02 27 62.29 149.81 2.7 3106 1980 04 13 55.04 160.31 5.4 

3024 1979 02 28 52.94 169.06 4.5 3108 1980 04 15 51.87 175.96 5.1 

3026 1979 03 01 60.63 141.24 5.4 3111 1980 05 14 68.41 148.90 4.4 

3027 1979 03 02 60.37 140.70 5.4 3112 1980 05 29 64.91 147.43 3.6 

154 U.S. Geological Survey Bulletin 1840 
lo=lll-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

3115 1980 06 12 59.82 151.75 3.3 3131 1980 09 09 61.01 150.91 3.6 

3116 1980 06 25 59.62 150.31 3132 1980 09 13 59.84 152.25 4.3 

3117 1980 06 28 62.92 151.10 4.3 3133 1980 09 19 65.60 148.05 3.8 

3121 1980 07 05 61.61 150.11 3.7 3134 1980 10 06 66.73 155.06 4.6 

3122 1980 07 06 56.56 154.24 5.2 3137 1980 10 20 

3123 1980 07 24 51.75 176.56 4.1 3138 1980 10 30 62.51 149.62 

3126 1980 08 04 61.09 151.87 3.8 3141 1980 11 23 60.08 152.83 

3128 1980 08 13 59.25 151.78 4.0 3142 1980 11 27 59.19 136.43 4.1 

3129 1980 08 18 63.05 150.51 4.5 3144 1980 12 11 60.03 152.70 

Io II 

!Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 N Lon °W Mag 

52 1925 02 24 111 1927 03 22 

53 1925 02 24 112 1927 03 25 

54 1925 02 24 119 1927 05 31 

55 1925 02 24 120 1927 06 30 

56 1925 02 24 121 1927 07 08 

57 1925 02 24 123 1927 10 24 

58 1925 02 24 126 1927 11 19 

59 1925 02 24 129 1927 11 23 

61 1925 02 24 130 1927 11 25 

62 1925 02 24 146 1928 04 19 56.00 160.00 

64 1925 02 24 147 1928 04 19 56.00 160.00 

65 1925 02 24 437 1933 09 20 

66 1925 02 24 775 1940 11 02 

61 1925 02 25 932 1949 06 07 

68 1925 02 25 1897 1967 04 03 61.87 148.55 3.8 

69 1925 02 25 1903 1967 04 29 51.41 178.26 5.3 

'TO 1925 02 25 1918 1967 06 22 64.81 147.40 4.1 

71 1925 02 25 1925 1967 06 23 64.70 147.40 4.0 

73 1925 02 25 2111 1968 12 07 61.80 149.10 

14 1925 02 25 2112 1968 12 09 51.80 176.80 4.2 

75 1925 02 25 2116 1968 12 26 51.50 177.80 4.2 

16 1925 02 26 2121 1969 01 03 51.20 179.40 5.8 

11 1925 02 27 2144 1969 05 23 51.40 176.60 4.4 

78 1925 02 27 2146 1969 06 06 64.90 147.50 

79 1925 02 27 2157 1969 07 17 64.04 147.33 4.5 

82 1925 03 11 2199 1970 03 17 59.20 147.90 5.1 

83 1925 03 11 2202 1970 04 03 3.2 

109 1927 01 16 2227 1970 08 12 51.40 179.20 4.6 

Table 2-Maximum Intensity 155 
lo=ll-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag EQ.No. Year MoDy Lat 0 N Lon ° W Mag 

2244 1970 09 17 62.80 150.40 3.9 2490 1972 10 27 

2246 1970 09 23 51.40 179.40 5.2 2498 1972 11 30 51.99 175.35 4.4 

2268 1970 12 01 51.40 175.30 5.6 2500 1972 12 15 60.74 151.37 4.4 

2296 1971 02 07 51.10 177.00 5.4 2501 1972 12 15 61.20 149.33 

2302 1971 03 11 59.33 146.65 5.0 2509 1973 01 09 51.41 178.21 5.1 

2318 1971 04 30 52.80 172.50E 5.5 2510 1973 01 10 55.22 159.94 4.2 

2323 1971 05 10 51.42 177.24 5.3 2513 1973 01 15 

2326 1971 05 18 61.71 149.56 2.9 2515 1973 01 17 

2327 1971 05 18 60.00 151.90 3.9 2517 1973 02 01 51.79 176.26E 5.3 

2328 1971 05 21 52.55 173.22 5.7 2518 1973 02 07 61.26 150.48 3.6 

2336 1971 06 21 51.68 177.25 4.6 2520 1973 02 13 51.25 179.22 5.4 

2346 1971 08 05 51.40 176.74 4.1 2521 1973 03 06 

2348 1971 08 13 51.80 176.54 4.1 2523 1973 03 11 56.91 136.43 

2374 1971 11 30 2525 1973 03 20 61.63 150.89 

2377 1971 12 08 51.72 178.43E 5.2 2529 1973 03 26 52.82 173.82E 5.0 

2381 1971 12 26 50.57 175.14 5.2 2533 1973 04 05 51.98 176.01 3.9 

2383 1971 12 31 51.90 179.93 5.4 2534 1973 04 06 51.42 178.44 5.0 

2384 1972 01 03 51.14 178.90E 5.5 2535 1973 04 06 61.23 149.47 3.8 

2389 1972 01 31 62.07 150.48 3.7 2537 1973 04 11 4.6 

2390 1972 02 01 51.77 177.66E 5.2 2540 1973 04 27 

2394 1972 02 22 51.40 175.98 4.2 2545 1973 05 15 4.2 

2398 1972 03 02 51.40 177.52 4.2 2546 1973 05 18 63.07 150.95 4.7 

2414 1972 04 24 4.4 2551 1973 05 20 60.97 152.44 4.9 

2417 1972 04 27 2553 1973 05 26 51.73 175.42 4.6 

2418 1972 05 03 51.45 179.21 5.3 2555 1973 05 26 60.16 153.96 4.4 

2420 1972 05 07 51.44 176.84 2559 1973 06 12 

2423 1972 05 20 57.83 153.82 5.2 2567 1973 06 26 52.24 174.11E 4.9 

2424 1972 05 23 2578 1973 07 18 

2431 1972 06 22 61.42 147.49 4.5 2579 1973 08 06 51.53 178.05 4.6 

2435 1972 07 25 51.23 176.79 4.0 2583 1973 08 17 51.38 176.61 4.9 

2436 1972 07 27 51.08 179.26 4.8 2588 1973 08 27 51.31 175.94 4.7 

2441 1972 08 03 63.39 147.59 3.8 2589 1973 08 27 51.70 173.69 4.8 

2443 1972 08 03 2590 1973 08 28 

2447 1972 08 04 51.50 178.47 5.0 2593 1973 09 08 51.30 179.23 4.9 

2448 1972 08 04 56.22 135.53 5.1 2594 1973 09 11 

2450 1972 08 04 51.17 177.99 4.2 2595 1973 09 14 

2460 1972 08 18 2605 1973 11 06 4.5 

2461 1972 08 23 51.43 176.64 3.8 2609 1973 11 07 52.61 175.09 4.6 

2463 1972 08 26 2610 1973 11 07 4.5 

2470 1972 09 07 61.68 150.63 2611 1973 11 08 

2471 1972 09 11 59.63 148.94 5.1 2616 1973 11 26 4.5 

2472 1972 09 13 51.36 175.43 4.2 2618 1973 12 03 4.4 

2474 1972 09 20 51.79 174.02E 5.0 2619 1973 12 09 51.36 179.14 4.8 

2475 1972 09 23 51.23 175.01 4.8 2621 1973 12 13 64.76 148.02 

2477 1972 10 01 62.74 149.08 4.7 2623 1973 12 14 

156 U.S. Geological Survey Bulletin 1840 
lo=ll-continued 

l~.No. Year MoDy Lat 0 NLon °W Mag IEQ.No. Year MoDy Lat 0 NLon °W Mag 

2625 1973 12 17 4.3 2'108 1974 11 28 

262'1 1974 01 07 64.88 147.56 2709 1974 11 28 61.63 148.35 

2628 1974 01 08 2711 1974 11 31 51.56 176.75 

2630 1974 01 25 61.53 147.60 2713 1974 12 22 51.44 178.52 4.6 

2631 1974 01 31 61.93 148.67 2721 1975 01 10 51.59 178.46 4.9 

2632 1974 02 01 62.14 147.83 3.5 2723 1975 01 16 62.90 148.31 

2633 1974 02 02 61.46 147.47 3.8 2724 1975 01 22 

2634 1974 02 02 61.60 147.60 5.1 2725 1975 01 24 64.80 147.41 

263'1 1974 02 16 51.26 179.29 4.2 2727 1975 01 26 61.75 149.70 

2638 1974 02 17 2729 1975 01 27 52.49 176.19 4.9 

2639 1974 03 09 61.40 149.62 2731 1975 01 31 52.92 168.47 4.2 

2640 1974 03 10 50.53 175.11 4.7 2'132 1975 02 02 

2641 1974 03 10 63.16 150.50 4.5 2733 1975 02 02 53.05 173.45E 5.9 

2642 1974 03 25 2736 1975 02 02 51.81 175.40 4.1 

2643 1974 03 26 64.89 150.99 2738 1975 02 02 52.94 173.56E 4.9 

264'1 1974 04 06 55.34 160.60 4.3 2742 1975 02 10 60.70 147.00 4.3 

2649 1974 04 06 2744 1975 02 15 51.84 175.26 4.4 

2650 1974 04 06 2'145 1975 02 15 

2653 1974 04 18 59.16 139.97 3.9 2746 1975 02 21 

2656 1974 04 26 51.76 176.75 4.7 2748 1975 02 23 

265'1 1974 04 28 61.67 149.02 2749 1975 02 23 51.27 179.27 5.0 

2659 1974 05 11 61.66 150.59 3.8 2750 1975 03 04 

2661 1974 05 21 63.31 151.25 4.2 2752 1975 04 05 

2662 1974 05 26 62.93 148.23 2753 1975 04 06 

2663 1974 05 26 61.57 150.24 2754 1975 04 07 61.56 150.57 3.6 

2665 1974 05 28 60.61 149.78 3.4 2755 1975 04 09 65.84 149.89 

2666 1974 06 04 2758 1975 04 12 61.92 150.31 

266'1 1974 06 06 52.02 175.40 4.1 2768 1975 04 20 51.26 179.63 

2668 1974 06 11 51.92 173.53 4.8 2769 1975 04 20 51.32 179.56 

2669 1974 06 15 2771 1975 04 26 

2670 1974 06 22 51.25 178.24 4.5 2774 1975 05 15 51.72 175.42 4.0 

2671 1974 06 27 2777 1975 05 21 60.18 147.58 4.8 

2672 1974 07 06 2778 1975 06 04 51.94 179.58 4.5 

2678 1974 08 11 66.02 165.51 4.1 2779 1975 06 11 62.17 149.64 4.3 

2680 1974 08 14 51.56 178.15 5.7 2781 1975 07 14 60.70 151.28 

2684 1974 08 22 51.42 176.32 4.1 2785 1975 09 08 61.53 146.24 

2685 1974 08 24 51.66 178.62 4.0 2788 1975 09 30 51.71 179.45 4.6 

2686 1974 08 26 2792 1975 10 30 51.36 179.35 5.0 

2687 1974 08 26 2798 1975 12 03 61.67 150.83 

2688 1974 08 27 51.94 178.84 4.4 2800 1975 12 25 61.82 148.68 

2689 1974 08 28 2804 1976 01 13 51.79 174.70 3.9 

2692 1974 09 24 2805 1976 01 15 61.74 149.77 

2695 1974 10 03 2807 1976 01 17 61.44 148.38 2.6 

2702 1974 11 11 2808 1976 01 22 61.57 149.96 

2'106 1974 11 15 2812 1976 02 19 52.50 179.52 4.9 

Table 2-Maximum Intensity 157 
lo=ll-continued 

Eq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

2814 1976 02 28 51.56 178.54 4.8 2958 1978 05 31 61.36 149.70 3.0 

2832 1976 06 01 64.70 147.80 2.9 2959 1978 06 10 57.92 156.72 4.5 

2833 1976 06 10 51.52 176.54 4.5 2963 1978 07 13 61.11 149.95 3.5 

2836 1976 07 05 51.30 179.14 4.6 2965 1978 07 19 61.33 149.98 3.0 

2837 1976 07 05 51.33 179.16 5.2 2974 1978 08 22 65.16 151.99 4.0 

2839 1976 07 22 51.49 177.86 4.9 2975 1978 08 22 65.23 152.12 3.8 

2840 1976 07 30 61.33 147.45 3.9 2976 1978 08 22 64.92 152.53 3.8 

2842 1976 08 16 51.50 178.38 5.1 2977 1978 08 22 64.99 152.31 3.4 

2843 1976 08 16 51.49 178.05 4.8 2978 1978 08 26 65.08 152.36 3.3 

2847 1976 09 05 51.40 178.77 4.4 2979 1978 09 03 64.58 147.16 3.9 

2848 1976 09 15 61.08 150.62 2984 1978 09 25 51.79 175.28 4.6 

2854 1976 11 11 61.31 149.79 3.2 2991 1978 10 27 62.20 151.05 

2858 1977 01 03 51.43 179.08 4.8 2993 1978 10 31 61.91 149.57 3.5 

2863 1977 01 26 61.23 150.13 2994 1978 11 14 64.54 147.03 3.7 

2864 1977 01 30 51.57 175.53 4.1 2996 1978 11 24 62.03 150.52 4.5 

2875 1977 04 23 2997 1978 11 24 61.99 150.51 3.2 

2876 1977 04 27 62.29 150.97 3.1 3000 1978 12 04 65.04 147.51 3.3 

2882 1977 05 30 60.89 149.69 3001 1978 12 08 68.33 145.17 4.0 

2895 1977 08 04 59.53 152.89 3007 1979 01 08 61.77 150.08 2.5 

2899 1977 08 18 51.83 175.18 4.2 3008 1979 01 10 61.58 150.06 3.0 

2900 1977 08 29 51.56 173.97 5.4 3019 1979 02 17 62.80 148.28 

2902 1977 08 30 51.38 173.79 5.4 3036 1979 04 17 61.68 150.12 2.7 

2903 1977 09 04 51.21 178.39E 5.6 3037 1979 04 18 62.16 149.52 

2904 1977 09 04 51.10 178.27E 5.5 3045 1979 05 14 61.73 150.89 

2905 1977 09 04 51.14 177.95E 5.8 3049 1979 05 21 64.71 148.43 3.0 

2906 1977 09 09 62.19 149.53 4.6 3051 1979 05 28 61.64 150.02 

2912 1977 10 18 60.70 150.79 3.7 3057 1979 07 10 63.20 150.72 4.9 

2914 1977 10 27 64.65 164.97 3061 1979 07 23 58.63 151.51 4.4 

2915 1977 10 28 60.91 149.72 3.4 3062 1979 07 23 61.64 150.51 2.9 

2916 1977 11 04 61.13 150.30 3063 1979 07 30 62.04 145.44 3.5 

2919 1977 11 06 62.10 144.94 3.3 3079 1979 10 16 51.85 175.36E 5.3 

2921 1977 11 17 64.61 149.54 3.3 3081 1979 10 27 61.70 149.58 3.0 

2927 1977 12 16 59.77 153.45 4.9 3089 1979 12 26 61.42 151.62 4.1 

2934 1978 01 09 51.61 177.17 3.9 3097 1980 03 12 52.15 168.98 5.4 

~942 1978 03 06 51.76 175.81 4.7 3110 1980 05 07 62.99 150.80 5.0 

2943 1978 03 20 60.18 153.61 4.9 3113 1980 06 03 60.00 152.67 3.7 

2948 1978 04 19 60.14 153.54 4.6 3139 1980 11 12 59.64 153.30 

2950 1978 04 21 64.53 147.95 3.7 

158 U.S. Geological Survey Bulletin 1840 
lo I 

iEq.No. Year MoDy Lat 0 NLon °W Mag Eq.No. Year MoDy Lat 0 NLon °W Mag 

2084 1968 09 22 51.30 177.60 4.2 2331 1971 06 07 51.53 176.92 4.3 

2129 1969 03 15 51.20 179.10 5.6 2332 1971 06 07 

2131 1969 03 31 51.90 178.00 4.5 2335 1971 06 17 61.80 149.80 3.8 

2141 1969 05 14 51.32 179.86 5.3 2338 1971 06 29 61.35 145.20 3.9 

2142 1969 05 14 51.45 179.73 4.6 2342 1971 07 25 52.15 173.10E 5.8 

2228 1970 08 13 51.80 175.50 4.1 2344 1971 07 30 

2229 1970 08 13 4.4 2350 1971 08 26 

2250 1970 10 09 51.40 178.40 5.2 2351 1971 08 27 51.40 177.80 5.0 

2256 1970 10 31 2354 1971 09 16 51.79 175.64 4.6 

2258 1970 10 31 51.20 179.40 5.0 2362 1971 10 13 51.95 179.59 5.3 

2263 1970 11 13 51.60 175.30 4.9 2363 1971 10 15 45.45 176.69 4.9 

2265 1970 11 20 51.40 178.30 5.1 2365 1971 11 03 52.02 177.31 4.4 

2269 1970 12 02 51.40 175.20 5.4 23'11 1971 11 24 3.8 

22'10 1970 12 02 51.43 175.24 5.2 2391 1972 02 13 59.94 154.20 4.9 

22'11 1970 12 06 2440 1972 08 01 

22'12 1970 12 15 52.40 176.20 4.8 2451 1972 08 06 

22'15 1970 12 25 51.80 175.20 4.7 2453 1972 08 08 

2280 1971 01 08 4.0 2455 1972 08 10 

2294 1971 02 07 51.75 177.26 4.5 2456 1972 08 11 

2295 1971 02 07 51.20 176.96 5.2 246'1 1972 08 29 

229'1 1971 02 08 51.29 178.83 5.2 2468 1972 08 29 

2300 1971 03 02 51.81 176.80 4.5 2492 1972 10 30 

2301 1971 03 10 3.5 2499 1972 12 07 

2303 1971 03 19 4.5 2506 1972 12 31 

2304 1971 03 25 52.52 176.76 5.3 2516 1973 01 17 52.36 175.92 3.9 

2305 1971 03 25 5.0 256'1 1973 05 31 4.3 

230'1 1971 03 27 52.55 174.53 5.6 25'1'1 1973 07 15 61.57 150.30 3.1 

2312 1971 04 13 3.7 2603 1973 11 06 3.5 

2314 1971 04 15 62.21 150.72 3.3 2612 1973 11 08 51.09 175.18 3.9 

2329 1971 05 31 3.5 2614 1973 11 09 61.85 150.59 

Table 2-Maximum Intensity 159 

Table 3. Earthquakes from table 1 that have one or more published magnitudes and their maximum intensities (lo). 

Explanation of column headings follows: 

Eq. No.-Consecutive earthquake identification number assigned to each event and used for cross-reference with 

tables 1 and 2. 

Date-Year, month, and day that event occurred. 

lo-Maximum intensity of the earthquake. 

Magnitude-The first magnitude for each event given is that from table 1. Subsequent magnitude entries are 

identified by type and magnitude source code. Source code (defined in glossary) refers to the data source of the 

given magnitude. 

Table 3-Magnitudes 161 
!Eq.No . Year MoDy Lat 0 NLon °W Io Magnitude Eq.No . Year MoDy Lat 0 N Lon °W Io Magnitude 

14 1899 09 04 60.00 142.00 10 8.3 172 1929 05 26 51.00 131.00 7 7.0 

7.9 Ms AN2 7.0 ML EPB 

7.7 m BG 7.0 Ms GR 

8.3 Ms CFR 7.0 Ms KA1 

8.2 Ms EPB 7.0 Ms SJD 

8.35 Ms GR 173 1929 07 03 62.50 149.00 3 6.3 

8.2 Ms SJD 6.25 Ms GR 

15 1899 09 10 60.00 140.00 11 8.6 214 1931 01 27 60.75 149.00 3 5.6 

8.0 Ms AN2 5.6 Ms GR 

7.9 m BG 229 1931 05 29 63.00 149.00 5 5.6 

8.6 Ms CFR 5.6 Ms GR 

8.6 Ms EPB 230 1931 05 30 53.00 173.00E 6 6.0 

8.35 Ms GR 6.0 Ms PAS 

8.6 Ms SJD 

16 1900 10 09 58.00 152.00 8 8.3 250 1931 10 17 63.00 147.00 5 5.6 

7.7 Ms AN2 5.6 Ms GR 

7.7 m BG 270 1931 12 24 60.00 152.00 4 6.3 

8.3 M·s CFR 6.25 Ms GR 

8.2 Ms EPB 293 1932 03 25 62.50 152.50 7 6.9 

8.2 Ms SJD 6.9 Ms GR 

22 1904 08 27 64.00 151.00 6 8.3 312 1932 09 14 61.00 148.00 5 6.3 

7.3 Ms AN2 6.25 Ms GR 

8.3 Ms CFR 323 1933 01 04 61.00 148.00 6 6.3 

7.75 Ms GR 6.25 Ms GR 

8.3 Ms SJD 

39 1911 09 22 60.50 149.00 8 6.9 332 1933 03 28 58.25 149.00 3 5.6 

6.9 Ms GR 5.6 Ms GR 

338 1933 04 27 61.25 150.75 7 7.0 

40 1912 07 07 64.00 147.00 6 7.4 7.0 Ms GR 

7.5 Ms AN1 7.1 m0 KA1 

7.4 Ms GR 6.9 Ms KAl 

7.1 Ms SJD 7.0 Ms SJD 

414 1933 06 12 61.50 150.50 3 5.6 

122 1927 10 24 57.50 137.00 6 7.1 5.6 Ms GR 

7.1 ML EPB 417 1933 06 13 61.00 151.00 3 6.3 

7.1 Ms GR 6.25 Ms GR 

7.1 mb KAl 426 1933 06 19 61.25 150.50 3 6.0 

7.t Ms KAt 6.0 Ms GR 

7.1 Ms SJD 

431 1933 06 28 53.50 165.00 3 6.0 

152 t928 06 21 60.00 t46.50 6 7.0 6.0 Ms GR 

7.0 Ms GR 434 1933 08 31 59.25 137.50 5 5.3 

7.3 mb KAt 5.2 ML EPB 

6.8 Ms KA1 5.25 Ms GR 

7.0 Ms SJD 436 1933 09 19 60.00 138.00 4 5.6 

5.5 ML EPB 

164 1929 Ot 21 64.00 t48.00 6 6.3 5.6 Ms GR 

6.25 Ms GR 481 1934 05 04 61.25 147.50 6 7.2 

7.2 Ms GR 

168 t929 03 07 51.00 170.00 5 8.6 7.1 mb KA1 

7.9 m DG 7.2 Ms SJD 

8.6 Ms CFR 499 1934 05 14 57.75 152.25 6 6.5 

8.1 Ms GR 6.5 Ms GR 

7.9 mb KA1 

7.5 Ms KA1 507 1934 06 02 61.25 147.00 3 6.3 

8.6 Ms SJD 6.25 Ms GR 

162 U.S. Geological Survey Bulletin 1840 
Eq.No . Year MoDy Lat 0 NLon °W Io Magnitude Eq.No . Year MoDy Lat 0 NLon °W Io Magnitude 

513 1934 06 18 60.50 151.00 5 6.8 942 1949 09 27 59.75 149.00 5 7.0 

6.75 Ms GR 7.0 Ms GR 

521 1934 08 02 61.50 147.50 5 6.0 7.0 mb KA1 

6.0 Ms GR 6.7 Ms KA1 

564 1935 01 23 52.25 169.50 3 6.8 7.0 Ms SJD 

6.75 Ms GR 953 1950 05 25 65.50 151.50 3 6.0 

617 1936 05 08 61.00 153.00 3 5.8 6.0 Ms PAS 

5.75 Ms GR 957 1950 08 26 65.00 162.00 5 6.5 

690 1937 07 22 64.75 146.75 8 7.3 6.5 Ms PAS 

7.3 Ms GR 965 1950 11 22 51.50 176.50 3 6.8 

7.1 mb KA1 6.75 Ms PAS 

7.3 Ms KA1 983 1951 06 25 61.00 150.10 5 ·6.3 

7.3 Ms SJD 6.25 Ms PAS 

691 1937 09 03 52.50 177.50 3 7.3 999 1952 03 09 59.50 136.00 5 6.0 

7.3 Ms GR 6.0 Ms PAS 

7.2 mb KAl 1039 1952 12 07 52.50 174.20E 6 6.3 

7.3 Ms SJD 6.25 Ms PAS 

709 1938 11 10 55.50 158.00 6 8.7 1052 1953 01 05 53.00 171.50E 3 7.1 

8.0 m BG 7.0 mb KAt 

8.7 Ms CFR 7.1 Ms KAt 

8.3 Ms GR 7.1 Ms PAS 

8.2 mb KA1 7.1 Ms SJD 

8.3 Ms KA1 1124 1954 04 17 51.50 179.00 3 6.8 

8.7 Ms SJD 6.75 Ms PAS 

748 1940 02 12 55.00 161.50 5 6.8 1139 1954 10 03 60.50 151.00 8 6.8 

6.75 Ms GR 6.75 Ms PAS 

774 1940 10 11 60.00 150.00 4 6.0 

6.0 Ms GR 1155 1954 12 30 53.00 168.00 3 6.6 

6.63 Ms PAS 

797 1941 07 30 61.00 151.00 6 6.3 1156 1955 01 13 53.00 167.50 3 6.9 

6.25 Ms GR 6.9 Ms PAS 

1157 1955 01 13 53.00 167.50 3 6.5 

850 1943 11 03 61.75 151.00 5 7.3 6.5 Ms PAS 

7.3 Ms GR 1162 1955 03 01 65.30 132.90 4 6.8 

7.1 mb KA1 6.6 ML EPB 

7.4 Ms KA1 6.75 Ms PAS 

7.3 Ms SJD 1166 1955 04 28 51.00 178.50 3 6.5 

6.5 Ms PAS 

877 1946 01 12 59.25 147.25 4 7.2 

7.2 Ms GR 1177 1955 07 17 54.00 168.00 ·3 5.9 

7.2 mb KA1 5.87 Ms PAS 

6.7 Ms KA1 1228 1956 11 17 54.50 134.00 4 6.5 

7.2 Ms SJD 6.4 Ms EPB 

6.5 Ms PAS 

881 1946 04 01 52.75 163.50 6 7.4 1235 1957 03 09 51.30 175.80 8 8.3 

7.4 Ms GR 7.7 mb KA1 

7.2 mb KA1 8.1 Ms KA1 

7.3 Ms KA1 8.3 Ms PAS 

7.4 Ms SJD 8.25 Ms SJD 

898 1947 10 16 64.50 148.80 8 7.0 1242 1957 03 10 51.60 174.40 3 6.6 

7.0 Ms GR 6.63 Ms PAS 

6.9 mb KA1 

7.2 Ms KAt 1247 1957 03 10 51.50 173.60 3 6.8 

7.0 Ms SJD 6.75 Ms BRK 

Table 3-Magnitudes 163 
Eq.No. Year MoDy Lat 0 NLon °W Ia Magnitude Eq.No. Year MoDy Lat 0 NLon °W Ia Mas;~;nitude 

1251 t957 03 11 51.20 176.70 3 6.9 1368 t958 05 11 65.t0 151.94 5 6.4 

6.87 Ms PAS 6.38 Ms PAS 

1258 t957 03 11 51.5t t78.75 3 6.8 1375 1958 07 10 58.60 137.10 11 7.9 

7.t mb KAt 7.9 ML EPB 

6.9 Ms KAt 7.4 mb KA1 

6.75 Ms PAS 7.9 Ms KAl 

. 7.2 Ms SJD 7.9 Ms PAS 

1259 t957 03 11 51. tO t79.00 3 6.5 7.9 Ms SJD 

6.5 Ms PAS 1376 t958 07 t3 58.9t t36.99 3 5.6 

1263 t957 03 t2 51.70 t74.t0 3 6.4 5.63 Ms BRK 

6.37 Ms PAS 5.6 ML EPB 

1264 t957 03 t2 51.00 t78.20 3 6.4 1384 t958 08 3t 63.27 t44.23 5 5.9 

6.37 Ms PAS 5.88 Ms BRK 

6.2 ML EPB 

1267 t957 03 t2 51.39 t76.90 3 7.3 1403 t958 t2 22 66.00 t47.00 3 6.0 

7.t mb KAt 6.0· Ms PAS 

7.0 Ms KAt 

7.3 Ms PAS 1419 t959 06 04 59.50 153.00 3 5.5 

7.3 Ms SJD 5.5 Ms PAS 

1277 t957 03 t3 51.30 t78.50 3 6.8 1441 t959 t2 26 59.50 t51.50 3 6.3 

6.75 Ms PAS 6.25 Ms PAS 

1280 1957 03 t4 51.32 t76.44 3 7.2 1457 t960 02 26 51.50 t78.00 3 6.1 

7.0 mb KAt 6.t3 Ms PAS 

7.t Ms KAt 1466 t960 05 t3 55.00 t61.50 4 6.3 

7.2 Ms PAS 6.25 Ms PAS 

7.2 Ms SJD 1469 t960 06 t7 52.50 t73.50 3 6.t 

1288 t957 03 t6 51.57 t78.86 3 6.8 6.13 Ms PAS 

7.0 mb KAt 

7.0 Ms KAt 1472 1960 07 03 50.50 t77 .00 3 6.9 

6.75 Ms PAS 6.2 mb KA2 

7.2 Ms SJD 6.9 Ms KA2 

1300 t957 03 t9 51.50 t75.00 3 6.8 6.88 Ms PAS 

6.75 Ms PAS 7.0 Ms SJD 

1475 1960 07 16 65.89 167.03 5 4.5 

1318 t957 03 30 51.95 t75.t6 3 6.2 1476 1960 07 16 65.65 167.04 5 4.4 

6.2 Ms UPP 1479 1960 08 04 51.20 179.00E 3 6.1 

1319 t957 03 3t 51.5t t78.47 3 6.t 6.13 Ms PAS 

6.t Ms UPP 1499 1960 12 21 61.50 152.90 3 5.8 

1321 t957 04 04 58.t7 t55.04 4 6.0 5.75 Ms PAS 

6.0 Ms UPP 

1336 t957 06 23 57.92 t37.7t 3 5.6 1502 196t 01 05 51.80 176.30 3 6.8 

5.63 Ms BRK 6.75 Ms PAS 

5.6 ML EPB 1507 1961 01 30 65.30 149.90 5 5.5 

1354 t958 Ot 24 60.00 t52.00 4 6.5 5.5 Ms PAL 

6.5 Ms PAS 1509 1961 02 06 51.70 t74.50 3 5.4 

5.38 Ms PAL 

1359 t958 04 07 66.03 t56.59 8 7.3 1514 1961 03 28 51.70 176.20 3 6.3 

7.t mb KAt 6.25 Ms PAS 

7.3 Ms KAt 1519 1961 05 17 52.20 t73.90E 3 6.0 

7.3 Ms PAS 6.0 Ms PAS 

7.3 Ms SJD 

1362 t958 04 t3 66.00 156.00 5 6.8 1530 1961 09 05 60.00 150.60 6 6.1 

6.75 Ms PAS 6.13 Ms PAS 

1366 t958 05 tO 65.23 t52.0t 5 6.4 1543 1961 09 25 60.50 153.00 3 5.9 

6.38 Ms PAS 5.88 Ms PAS 

164 U.S. Geological Survey Bulletin 1840 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

1569 1962 05 10 62.00 150.10 5 6.0 1653 1964 03 28 61.04 147.73 10 8:3 

6.0 Ms BRK 8.3 Ms CGS 

1578 1962 06 29 62.40 152.00 4. 4.8 8.4 ML EPB 

4.75 Ms BRK 6.7 mb ISC 

1582 1962 07 16 62.30 153.10 5 6.0 7.9 mb KA1 

6.0 Ms PAL 8.4 Ms KA1 

1587 1962 08 18 62.30 152.50 5 6.1 8.5 Ms PAS 

6.13 Ms PAS 8.5 Ms SJD 

1588 1962 08 18 62.30 152.50 5 6.4 1656 1964 03 28 59.80 149.40 3 6.1 

6.38 Ms PAS 6.1 mb CGS 

6.1 mb ISC 

1590 1962 08 31 51.30 179.70 3 6.8 1657 1964 03 28 58.80 149.50 4 6.1 

6.75 Ms PAS 6.1 mb CGS 

1591 1962 09 01 51.30 179.70 3 6.5 6.0 mb ISC 

6.5 Ms PAS 6.2 Ms PAS 

1609 1963 04 11 51.90 176.20 3 4.4 1658 1964 03 28 57.40 151.70 3 5.7 

4.4 mb CGS 5.7 mb CGS 

1615 1963 05 08 54.90 163.80 4. 5.8 5.6 mb ISC 

5.8 mb CGS 1659 1964 03 28 57.50 151.60 3 5.4 

1616 1963 05 12 57.30 154.00 3 6.1 5.4 mb CGS 

6.1 mb CGS 5.5 mb ISC 

1618 1963 06 24 59.50 151.70 7 5.7 1660 1964 03 28 57.20 152.40 3 6.0 

5.7 mb CGS 6.0 mb CGS 

6.75 Ms PAS 6.0 mb ISC 

1620 1963 07 08 57.00 134.50 3 3.7 6.3 Ms PAS 

3.7 mb CGS 1661 1964 03 28 60.30 146.60 3 5.4 

1622 1963 08 10 49.60 179.20E 3 4.3 5.4 mb CGS 

4.3 mb CGS 5.5 mb ISC 

1629 1963 10 15 59.00 136.80 3 4.3 1662 1964 03 28 56.50 154.00 3 6.1 

4.3 mb CGS 6.1 mb cas 

1632 1963 10 18 62.60 146.60 3 4.2 6.1 mb ISC 

4.2 mb CGS 6.5 Ms PAS 

1663 1964 03 28 57.80 152.10 3 4.9 

1639 1963 12 11 51.20 179.30E 3 5.3 4.9 mb CGS 

5.3 mb CGS 5.0 mb ISC 

164.4 1964 01 08 51.40 179.00 3 4.2 1664 1964 03 28 57.80 151.30 3 4.8 

4.2 mb CGS 4.8 mb CGS 

4.2 mb ISC 4.8 mb ISC 

164.5 1964 01 12 53.20 166.30 3 5.5 

5.5 mb CGS 1665 1964 03 28 59.80 148.70 5 5.8 

5.6 mb ISC 5.8 mb CGS 

1647 1964 01 24 60.40 146.50 3 3.7 6.2 mb ISC 

3.7 mb CGS 6.6 Ms PAS 

3.7 mb ISC 1667 1964 03 29 57.00 151.70 3 5.2 

1649 1964 02 06 55.70 155.80 5 6.9 5.2 mb CGS 

5.6 mb CGS 5.1 mb ISC 

6.1 mb ISC 1669 1964 03 29 56.80 152.40 3 4.8 

7.1 mb KA1 4.8 mb CGS 

7.0 Ms KA1 4.7 mb ISC 

6.88 Ms PAS 1671 1964 03 29 56.70 152.70 3 4.6 

7.1 Ms SJD 4.6 mb CGS 

4.6 mb ISC 

1650 1964 02 06 55.80 155.90 5 5.4 1672 1964 03 29 56.10 154.50 3 4.8 

5.4 mb CGS 4.8 mb CGS 

5.9 mb ISC 4.8 mb ISC 

Table 3-Magnitudes 165 
Eq.No. Year Mo Dy Lat 0 NLon °W Io MaRnitude EQ.No. Year MoDy Lat 0 NLon °W Io Magnitude 

1673 1964 03 29 56.50 152.60 3 4.9 1695 1964 04 16 61.40 149.20 4 4.6 

4.9 mb CGS 4.6 mb CGS 

4.8 mb ISC 4.5 mb ISC 

1675 1964 03 29 60.00 149.10 3 4.9 1696 1964 04 16 59.50 147.80 3 4.5 

4.9 mb CGS 4.5 mb CGS 

5.2 mb ISC 4.0 mb ISC 

1677 1964 03 30 56.30 154.40 3 5.0 1698 1964 04 20 61.40 147.30 3 5.7 

5.0 mb CGS 

5.0 mb ISC 

5.7 rnb CGS 

5.9 mb ISC 

1678 1964 03 30 56.40 152.50 3 5.2 6.5 Ms PAS 

5.2 mb CGS 1699 1964 04 20 61.50 14 7.30 3 5.0 

. 5.0 mb ISC 5.0 mb CGS 

1679 1964 03 30 58.00 151.60 3 5.0 5.0 mb ISC 

5.0 mb CGS 

5.0 mb ISC 

1701 1964 04 21 61.50 147.40 3 5.4 

5.4 mb CGS 

5.4 mb ISC 

1680 1964 03 30 56.50 152.70 3 5.3 6.0 Ms PAS 

5.3 mb CGS 

5.3 mb ISC 

1681 1964 03 30 57.40 152.30 3 5.1 

1710 1964 05 15 61.40 147.90 3 3.7 

3.7 mb CGS 

5.1 mb CGS 3.6 mb ISC 

5.0 mb ISC 1712 1964 05 21 60.20 147.20 3 4.2 

1682 1964 04 03 61.60 147.60 5 5.7 4.2 mb CGS 

5.7 mb CGS 4.3 mb ISC 

5.8 mb ISC 

6.0 Ms PAS 

1713 1964 05 21 59.00 153.50 3 5.3 

4.88 Ms BRK 

1683 1964 04 04 56.90 152.70 3 5.9 5.3 mb CGS 

5.9 mb CGS 5.3 mb ISC 

5.8 rnb ISC 1716 1964 05 28 53.70 167.80 3 4.7 

1684 1964 04 04 59.40 145.20 3 5.1 1717 1964 05 29 60.20 146.30 3 5.6 

5.1 rnb CGS 

5.1 mb ISC 

5.38 Ms BRK 

5.6 mb CGS 

5.6 mb ISC 

1686 1964 04 12 61.20 151.10 4 5.0 

5.0 mb CGS 

4.9 rnb ISC 

1687 1964 04 13 59.40 143.90 3 4.9 

1718 1964 06 02 59.70 144.40 3 5.1 

4.75 Ms BRK 

5.1 mb CGS 

4.9 rnb CGS 5.2 mb ISC 

5.0 rnb ISC 

1688 1964 04 13 56.60 152.10 3 5.1 

5.1 rnb CGS 

1719 1964 06 05 60.40 146.00 3 5.2 

5.2 mb CGS 

5.4 mb ISC 

5.1 rnb ISC 

1689 1964 04 14 61.57 149.76 4 4.1 

1722 1964 06 29 62.70 152.00 4 5.6 

5.6 mb CGS 

3.7 rnb ISC 5.4 mb ISC 

1690 1964 04 14 61.30 147.30 4 5.4 

5.4 mb CGS 

5.4 rnb ISC 

1723 1964 07 23 59.90 149.20 3 5.4 

5.4 mb CGS 

5.4 mb ISC 

1692 1964 04 14 61.40 150.80 4 5.1 

5.1 rnb CGS 

5.1 rnb ISC 

1725 1964 07 27 60.90 148.00 3 4.2 

4.2 mb CGS 

4.1 mb ISC 

1694 1964 04 14 58.00 152.60 6 5.4 

4.88 Ms BRK 

5.4 rnb CGS 

5.4 rnb ISC 

1726 1964 08 02 56.20 149.90 3 5.4 

5.4 mb CGS 

5.5 mb ISC 

6.0 Ms PAS 

166 U.S. Geological Survey Bulletin 1840 
Eq.No. Year MoDy Lat 0 NLon ow Io Magnitude Eq.No. Year MoDv Lat 0 N Lon °W Io Magnitude 

1732 1964 09 13 61.40 149.80 3 3.9 1757 1965 02 04 50.90 177.70E 6 5.0 

3.9 mb CGS 5.0 mb CGS 

3.9 mb ISC 4.9 mb ISC 

1734 1964 09 16 60.00 147.10 3 5.5 1763 1965 02 06 53.20 161.90 3 6.4 

5.5 mb CGS 6.4 mb cas 

5.5 mb ISC 6.5 mb ISC 

1735 1964 09 23 61.60 150.00 3 4.1 6.63 Ms PAS 

4.1 mb CGS 1766 1965 02 06 53.30 161.80 4 6.1 

4.1 mb ISC 6.1 IDb CGS 

1737 1964 09 28 61.00 147.40 3 4.5 6.1 mb ISC 

4.5 mb CGS 6.5 Ms PAS 

4.5 mb ISC 1768 1965 02 18 51.40 179.10E 3 5.4 

1738 1964 10 18 60.30 152.30 3 4.1 5.4 IDb CGS 

4.1 mb CGS 5.6 mb ISC 

4.3 mb ISC 6.0 Ms PAS 

1770 1965 03 16 52.10 175.00E 3 4.9 

1743 1964 11 20 63.70 146.50 3 4.6 4.9 mb cas 

4.6 mb CGS 4.6 mb ISC 

4.3 mb ISC 

1745 1964 11 27 65.30 151.40 3 4.2 1771 1965 03 17 51.10 178.30 3 4.2 

4.2 mb CGS 4.2 mb cas 

4.0 mb ISC 4.3 mb ISC 

1746 1964 11 27 62.60 151.50 4 5.4 1773 1965 03 17 52.80 171.90E 3 6.0 

4.63 Ms BRK 6.0 mb cas 

5.4 mb CGS 5.7 mb ISC 

5.0 mb ISC 1776 1965 03 30 50.60 177.90E 3 7.3 

1747 1964 12 13 64.90 165.70 6 5.4 7.2 IDb BD 

5.4 mb CGS 7.5 Ms BD 

5.3 mb ISC 7.3 IDb CGS 

6.0 Ms PAL 6.5 IDb ISC 

1748 1964 12 17 51.40 177.90 3 5.5 7.4 IDb KA1 

4.75 Ms BRK 7.4 Ms KA1 

5.5 mb CGS 7.13 Ms PAS 

5.5 mb ISC 1778 1965 04 10 50.80 175.80E 3 5.1 

5.1 mb cas 

1749 1964 12 20 52.10 177.10 3 4.3 4.9 mb ISC 

4.3 mb CGS 1779 1965 04 16 64.70 160.10 6 5.8 

4.1 mb ISC 5.8 mb cas 

1751 1965 01 03 60.20 151.20 3 5.6 5.8 mb ISC 

5.6 mb CGS 5.88 Ms PAS 

4.9 mb ISC 

1752 1965 01 04 59.90 153.60 3 5.4 1780 1965 04 17 52.60 173.10E 3 5.1 

5.4 mb CGS 5.1 mb CGS 

5.2 mb ISC 

1753 1965 01 06 60.00 151.80 3 5.2 1781 1965 04 20 52.40 172.00E 3 5.5 

5.2 mb CGS 5.5 mb CGS 

5.2 IDb ISC 5.5 mb ISC 

5.13 Ms PAS 

1756 1965 02 04 51.30 178.60E 6 6.0 1783 1965 04 26 54.50 162.60 5 5.9 

7.3 mb BD 5.13 Ms BRK 

8.1 Ms BD 5.9 fib cas 

6.0 mb CGS 5.8 IDb ISC 

6.1 mh ISC 1784 1965 05 11 61.40 149.60 4 5.5 

7.7 mb KA1 5.5 fib cas 

8.2 Ms KA1 5.2 fib ISC 

7.75 Ms PAS 5.75 Ms PAS 

Table 3-Magnitudes 167 
Eq.No . Year MoDy Lat 0 NLon °W Io Magnitude Eq.No . Year MoDy Lat 0 N Lon °W Io Magnitude 

1786 1965 06 01 65.10 147.00 3 4.0 1804 1965 10 01 50.10 178.20E 3 6.3 

4.0 fib CGS 6.3 fib CGS 

3.8 fib ISC 6.2 mb ISC 

1789 1965 06 26 51.40 178.60 3 5.2 6.5 Ms PAS 

5.2 fib CGS 1805 1965 10 07 51.70 176.00 3 4.7 

5.2 fib ISC 4.7 fib CGS 

1790 1965 07 02 53.10 167.60 6 6.7 4.6 fib ISC 

6.7 fib CGS 1806 1965 10 10 51.80 175.40 3 5.2 

6.7 fib ISC 5.2 fib CGS 

7.0 fib KAt 5.0 fib ISC 

6.5 Ms KAt 5.75 Ms PAL 

6.9 Ms PAS 1807 1965 10 12 52.10 174.80 3 5.1 

1791 1965 07 06 59.90 149.30 3 3.9 5.1 fib CGS 

3.9 fib CGS 5.0 fib ISC 

4.2 fib ISC 1808 1965 10 12 51.90 176.40 3 4.1 

1794 1965 07 15 61.80 148.80 3 3.8 4.1 fib CGS 

3.8 fib CGS 4.1 fib ISC 

3.8 fib ISC 

1811 1965 10 16 65.20 164.20 3 4.4 

1795 1965 07 27 51.20 177.60E 3 5.4 4.4 fib CGS 

5.4 fib CGS 4.4 fib ISC 

5.2 fib ISC 1812 1965 10 24 52.10 176.10 3 4.9 

1796 1965 07 29 50.90 171.40 3 6.3 4.9 fib CGS 

6.3 fib CGS 4.6 fib ISC 

6.3 fib ISC 1813 1965 10 25 51.50 178.50 3 4.0 

7.1 fib KA1 4.0 mb CGS 

6.7 Ms KAt 4.0 mb ISC 

6.75 Ms PAS 1814 1965 11 06 60.70 147.30 4 5.2 

1797 1965 08 08 51.80 175.20 3 5.3 5.2 fib CGS 

4.5 Ms BRK 5.2 fib ISC 

5.3 fib CGS 1815 1965 11 08 51.60 177.00 3 4.3 

5.2 fib ISC 4.3 fib CGS 

1799 1965 09 04 58.20 152.70 3 6.2 4.3 mb ISC 

7.0 fib BD 

7.1 Ms BD 1816 1965 11 22 51.90 176.10 3 5.6 

6.2 fib CGS 5.6 mb CGS 

6.1 fib ISC 5.5 fib ISC 

7.0 fib KA1 1817 1965 11 23 51.40 179.70 3 5.6 

6.8 Ms KAt 5.6 fib CGS 

6.88 Ms PAS 5.5 fib ISC 

1800 1965 09 05 51.80 176.30 3 4.2 5.75 Ms PAL 

4.2 fib CGS 1818 1965 11 23 51.40 179.60 3 4.2 

4.2 fib ISC 4.2 fib CGS 

4.2 fib ISC 

1801 1965 09 08 57.50 152.20 3 5.6 1819 1965 11 24 63.20 150.90 3 5.0 

5.0 Ms BRK 4.4 Ms BRK 

5.6 fib CGS 5.0 fib CGS 

5.5 fib ISC 4.9 mb ISC 

1821 1965 12 12 51.50 178.90 3 5.2 

1802 1965 09 09 60.10 153.20 3 3.9 5.2 fib CGS 

3.9 fib CGS 5.0 fib ISC 

3.9 fib ISC 

1822 1965 12 22 58.40 153.10 5 6.5 

1803 1965 09 23 59.80 152.30 3 3.9 6.5 fib CGS 

3.9 fib CGS 6.4 fib ISC 

3.9 fib ISC 6.88 Ms PAS 

168 U.S. Geological Survey Bulletin 1840 
!Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude [Eq.No. Year MoDy Lat 0 NLon °W Ia Magnitude 

1823 1965 12 30 54.10 164.30 3 5.7 1843 1966 05 19 54.10 164.10 4 5.1 

5.6 Ms BRK 5.1 mb CGS 

5.7 mb CGS 5.6 mb ISC 

5.4 mb ISC 6.0 Ms PAS 

1824 1965 12 30 58.20 152.40 3 5.3 1845 1966 06 22 61.30 147.70 3 5.2 

5.3 mb CGS 5.2 mb CGS 

4.9 mb ISC 5.1 mb ISC 

1825 1966 01 18 61.40 151.90 3 4.1 5.13 Ms PAL 

4.1 mb CGS 1847 1966 07 04 51.90 179.80E 3 6.0 

4.0 mb ISC 7.0 mb BD 

1826 1966 01 18 61.50 150.70 3 4.1 7.0 Ms BD 

4.1 mb CGS 6.0 mb CGS 

4.0 mb ISC 5.9 mb ISC 

1828 1966 01 24 51.70 176.30 3 4.5 7.0 mb KA1 

4.5 mb CGS 6.8 Ms KA1 

4.3 mb ISC 6.88 Ms PAS 

1849 1966 07 19 51.70 173.30 3 5.4 

1829 1966 01 28 51.90 177.10 3 5.4 5.2 Ms BRK 

5.4 mb CGS 5.4 mb CGS 

5.3 mb ISC 5.4 mb ISC 

1831 1966 02 06 60.40 152.30 4 5.3 1850 1966 07 22 51.70 173.50 3 5.4 

5.3 mb CGS 5.3 Ms BRK 

5.1 mb ISC 5.4 mb CGS 

1832 1966 02 16 58.20 152.20 3 3.9 5.6 mb ISC 

3.9 mb CGS 

3.6 mb ISC 1851 1966 08 07 50.60 171.20 3 6.2 

1833 1966 02 24 51.80 177.30 3 4.2 7.0 Ms BRK 

4.2 mb CGS 6.2 mb CGS 

4.0 mb ISC 6.3 mb ISC 

1834 1966 03 03 61.40 150.60 3 4.0 7.0 mb KA1 

4.0 mb CGS 6.4 Ms KAt 

3.9 mb ISC 1852 1966 08 17 52.20 175.00E 3 5.5 

5.5 mb CGS 

1836 1966 03 09 51.70 177.10 3 4.6 5.4 mb ISC 

4.6 mb CGS 1853 1966 08 24 51.90 176.20 3 4.2 

4.7 mb ISC 4.2 mb CGS 

1838 1966 03 25 56.60 135.40 3 4.7 4.2 mb ISC 

4.7 mb CGS 1855 1966 08 26 67.10 161.50 5 5.2 

4.7 mb EPB 5.2 mb CGS 

4.4 mb ISC 5.0 mb ISC 

1839 1966 04 22 57.40 152.30 3 5.9 1856 1966 08 30 61.30 147.50 5 5.8 

5.6 Ms BRK 5·.8 mb CGS 

5.9 mb CGS 5.7 mb ISC 

5.9 mb ISC 5.88 Ms PAS 

1840 1966 05 03 51.60 176.70 3 4.7 1857 1966 08 30 61.50 147.50 5 5.5 

4.7 mb CGS 5.0 Ms BRK 

4.7 mb ISC 5.5 mb CGS 

5.3 mb ISC 

1841 1966 05 14 51.90 177.70 3 5.9 1859 1966 09 01 61.70 149.70 3 5.1 

5.88 Ms PAS 5.1 mb CGS 

5.1 mb ISC 

1842 1966 05 15 51.40 178.40 3 5.7 

5.7 mb CGS 1860 1966 09 08 52.80 173.40E 3 5.0 

5.7 mb ISC 5.0 mb CGS 

5.75 Ms PAS 5.0 mb ISC 

Table 3-Magnitudes 169 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 N Lon °W Io Magnitude 

1861 1966 10 02 51.60 174.60 3 5.1 1885 1967 01 07 51.91 176.63 3 4.3 

5.1 fib CGS 4.3 fib CGS 

5.1 fib ISC 4.2 fib ISC · 

1862 1966 10 05 52.30 173.90 3 4.8 1886 1967 01 18 60.48 152.44 3 4.5 

4.8 fib OGS 4.5 fib CGS 

4.7 fib ISC 188'1 1967 01 28 52.38 169.52 3 5.9 

1863 1966 10 07 61.70 150.10 4 5.6 5.9 mb CGS 

5.6 fib CGS 6.0 fib ISC 

5.3 fib ISC 6.38 Ms PAS 

1865 1966 10 08 61.30 150.50 3 3.7 1888 1967 02 06 60.15 152.77 3 4.9 

3.7 fib CGS 4.9 mb CGS 

3.8 fib ISC 5.1 fib ISC 

1868 1966 10 20 51.40 176.60 3 5.1 1889 1967 02 06 64.72 146.86 5 4.5 

5.1 fib CGS 4.5 fib CGS 

4.5 fib ISC 

18'10 1966 11 17 51.40 176.30 3 4.6 

4.6 fib OGS 1892 1967 02 24 51.79 176.94 3 4.2 

4.6 fib ISC 4.2 fib OGS 

18'11 1966 11 17 51.30 176.30 3 4.8 4.2 fib ISC 

4.8 fib CGS 1894 1967 03 20 60.44 149.58 3 4.2 

4.7 fib ISO 4.2 fib OGS 

18'12 1966 11 20 51.40 176.50 3 5.3 4.2 fib ISC 

5.3 fib CGS 1895 1967 03 26 64.14 146.84 4 4.4 

5.3 fib ISC 4.4 fib OGS 

18'13 1966 11 21 51.80 179.90E 3 4.6 4.4 fib ISC 

4.6 fib OGS 1896 1967 03 31 63.12 148.50 3 4.5 

4.6 fib ISC 4.5 mb CGS 

18'15 1966 12 11 52.90 176.00 3 5.1 4.5 fib ISC 

5.1 fib OGS 1897 1967 04 03 61.87 148.55 2 3.8 

5.0 fib ISC 3.8 fib CGS 

3.8 fib ISC 

1876 1966 12 14 52.80 177.60 3 5.2 

5.2 fib OGS 1898 1967 04 04 60.23 148.51 3 4.1 

5.1 fib ISC 4.1 fib OGS 

187'1 1966 12 16 61.40 149.50 3 4.1 4.0 fib ISC 

4.1 fib CGS 1899 1967 04 12 56.12 136.12 3 4.6 

4.0 fib ISC 4.6 fib CGS 

18'18 1966 12 20 66.70 148.60 4 4.8 4.4 fib EPB 

4.8 fib CGS 1901 1967 04 21 64.65 147.17 4 4.0 

4.9 fib ISC 4.0 mb CGS 

1879 1966 12 20 66.70 148.80 4 4.9 3.9 fib ISC 

4.9 fib CGS 1902 1967 04 29 51.44 178.32 3 5.9 

4.9 fib ISC 5.9 fib CGS 

1880 1966 12 24 59.80 153.40 3 5.0 5.35 Ms GOL 

5.0 fib OGS 6.0 fib ISC 

5.0 fib ISC 1903 1967 04 29 51.41 178.26 2 5.3 

5.3 fib OGS 

1881 1966 12 25 51.80 176.10E 3 4.8 5.6 fib ISC 

4.8 fib CGS 

4.8 fib ISO 1905 1967 05 05 63.71 148.45 4 5.0 

1882 1966 12 26 64.60 147.60 3 3.8 5.0 fib CGS 

3.8 fib CGS 5.0 fib ISC 

3.9 fib ISC 

1884 1967 01 07 51.86 175.15 3 4.5 1906 1967 05 08 62.15 149.84 3 3.8 

4.5 fib CGS 3.8 fib OGS 

4.5 fib ISC 3.9 fib ISO 

170 U.S. Geological Survey Bulletin 1840 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude IEQ.No. Year MoDy Lat 0 NLon °W Io Magnitude 

1907 1967 05 19 51.70 176.92 3 4.7 1936 1967 06 24 64.78 147.50 3 3.9 

4.7 mb CGS 3.9 mb CGS 

4.7 mb ISC 4.3 ML COL 

1908 1967 06 01 53.70 165.60 4 5.7 3.9 mb ISC 

5.7 mb CGS 1937 1967 06 25 3 3.6 

5.7 mb ISC 3.6 ML COL 

1912 1967 06 21 64.80 147.40 7 5.6 1938 1967 06 25 64.76 147.38 3 3.3 

5.6 mb CGS 3.3 ML COL 

6.1 ML COL 1941 1967 06 26 3 4.1 

5.5 mb ISC 4.1 ML COL 

1914 1967 06 21 64.73 147.42 3 3.9 1945 1967 06 28 64.80 147.50 3 3.8 

3.9 mb CGS 3.8 ML COL 

4.4 ML COL 

3.9 mb ISC 1946 1967 06 29 51.70 177.00 3 4.6 

1915 1967 06 22 64.90 147.10 3 4.1 4.6 mb CGS 

4.1 ML COL 4.6 mb ISC 

4.1 mb ISC 1947 1967 07 01 54.40 158.00 4 6.2 

6.2 mb CGS 

1916 1967 06 22 64.80 147.50 3 3.8 6.2 mb ISC 

3.8 mb CGS 1948 1967 07 06 62.40 147.40 3 5.1 

4.3 ML COL 5.1 mb CGS 

4.0 mb ISC 5.1 mb ISC 

1917 1967 06 22 51.70 176.80 3 5.3 1950 1967 07 08 62.30 156.30 4 4.0 

5.3 mb CGS 4.0 mb CGS 

5.3 mb ISC 4.1 mb ISC 

1918 1967 06 22 64.81 147.40 2 4.1 1951 1967 07 08 62.30 156.30 4 4.0 

4.1 mb CGS 4.0 mb CGS 

4.7 ML COL 4.1 mb ISC 

4.1 mb ISC 

1919 1967 06 22 3 3.8 1952 1967 07 12 51.80 175.00 3 4.5 

3.8 ML COL 4.5 mb CGS 

1920 1967 06 22 64.80 147.30 3 4.1 4.4 mb ISC 

4.1 mb CGS 1961 1967 07 27 52.00 176.20 3 4.4 

4.4 ML COL 4.4 mb CGS 

4.4 mb ISC 

1922 1967 06 22 3 3.6 1969 1967 08 17 59.40 151.40 3 5.0 

3.6 MI. COL 5.0 mb CGS 

1925 1967 06 23 64.70 147.40 2 4.0 5.1 mb ISC 

4.0 mb CGS 1970 1967 08 18 61.50 151.00 3 4.5 

4.4 ML COL 4.5 mb CGS 

4.0 mb ISC 4.6 mb ISC 

1928 1967 06 23 64.81 147.45 6 4.6 1977 1967 09 03 60.50 151.60 3 4.7 

4.6 mb CGS 4.7 mb CGS 

5.6 ML COL 4.6 mb ISC 

4.7 mb ISC 

1929 1967 06 23 3 3.9 1982 1967 09 16 52.00 176.40 3 5.4 

3.9 ML COL 5.4 mb CGS 

5.4 mb ISC 

1930 1967 06 23 3 5.0 1988 1967 09 28 59.50 147.10 3 5.6 

5.0 ML COL 5.6 mb CGS 

1990 1967 10 10 52.30 176.10 3 5.0 

1932 1967 06 23 3 3.5 5.0 mb CGS 

3.5 ML COL 4.9 mb ISC 

1992 1967 10 11 63.00 151.10 3 4.6 

1935 1967 06 23 64.83 147.31 3 3.5 4.6 mb CGS 

3.5 ML COL 4.5 mb ISC 

Table 3-Magnitudes 171 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

1998 1967 11 10 62.30 151.40 3 4.9 2029 1968 02'23 51.60 177.20 3 4.5 

4.9 mb CGS 4.5 ffib CGS 

5.0 mb ISC 4.5 lllb ISC 

2004 1967 11 25 52.00 175.20 3 3.9 2030 1968 02 23 51.60 175.90 3 4.5 

3.9 mb CGS 4.5 mb CGS 

4.0 mb ISC 4.5 mb ISC 

2005 1967 11 27 60.30 140.80 3 4.6 2031 1968 02 23 51.50 176.30 3 4.6 

4.6 mb CGS 4.6 m1.1 CGS 

4.6 mb EPB 4.6 mb ISC 

4.8 mb ISC 2032 1968 02 23 51.90 179.10 3 5.2 

2012 1967 12 19 51.70 176.90 3 4.8 5.2 mb CGS 

4.8 mb CGS 5.2 mb ISC 

4.8 mb ISC 2034 1968 02 25 51.40 176.00 3 5.3 

2014 1968 01 14 52.70 171.20 4 5.5 5.3 m., CGS 

5.5 mb CGS 5.4 Jllb ISC 

5.4 mb ISC 

2040 1968 03 10 52.10 177.30 4 5.4 

2015 1968 02 18 51.70 177.70 3 4.2 5.4 mb CGS 

4.2 mb CGS 5.4 mb ISC 

4.2 mb ISC 2041 1968 03 13 51.70 176.80 3 4.8 

2016 1968 02 20 60.00 142.00 3 3.9 4.8 mb CGS 

3.9 mb CGS 4.8 mb ISC 

3.8 mb ISC 2048 1968 04 23 58.70 150.00 3 6.3 

201'1 1968 02 20 58.40 151.70 3 4.9 6.3 mb CGS 

4.9 mb CGS 6.2 mb ISC 

5.0 mb ISC 6.13 Ms PAS 

2018 1968 02 21 52.30 175.30 3 5.2 2049 1968 04 24 60.90 147.50 3 3.9 

5.2 mb CGS 3.9 mb CGS 

5.1 mb ISC 3.8 mb ISC 

2019 1968 02 21 52.30 175.30 3 5.3 2054 1968 05 18 61.20 147.60 3 4.3 

5.3 mb CGS 4.3 mb CGS 

5.3 mb ISC 4.2 mb ISC 

2020 1968 02 21 51.40 176.10 3 4.7 2056 1968 05 29 62.30 149.10 3 4.0 

4.7 mb CGS 4.0 m1.1 CGS 

4.8 mb ISC 3.9 m1..1 ISC 

2021 1968 02 21 51.60 176.00 3 4.7 2058 1968 06 15 61.00 146.90 3 4.9 

4.7 mb CGS 4.9 mb CGS 

2022 1968 02 21 51.70 175.90 3 4.8 4.8 mb ISC 

4.8 mb CGS 2061 1968 07 05 60.90 14 7.00 3 4.1 

4.8 mb ISC 4.1 mb CGS 

2023 1968 02 21 51.40 176.00 3 5.2 4.3 mb ISC 

5.2 mb ISC 206'1 1968 08 11 52.10 179.90 3 5.5 

2024 1968 02 21 51.40 175.80 3 4.4 5.5 mb CGS 

4.4 mb CGS 5.6 mb ISC 

4.3 mb ISC 2068 1968 08 14 60.20 153.00 3 4.6 

4.6 mb CGS 

2025 1968 02 21 51.70 176.00 3 4.2 4.5 mb ISC 

4.2 mb CGS 

4.2 mb ISC 2069 1968 08 18 65.90 155.20 4 3.9 

202'1 1968 02 22 51.40 176.30 3 5.1 3.9 mb CGS 

5.1 mb CGS 3.9 mb ISC 

5.2 mb ISC 

2028 1968 02 23 51.50 176.30 3 4.6 20'10 1968 08 31 64.70 147.40 3 3.8 

4.6 mb CGS 3.8 mb CGS 

4.7 mb ISC 3.9 mb ISC 

172 U.S. Geological Survey Bulletin 1840 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

2076 1968 09 02 64.70 147.50 3 4.0 2099 1968 10 31 65.42 150.09 4 4.5 

4.0 mb CGS 4.5 fib CGS 

4.0 mb ISC 4.6 mb ISC 

2077 1968 09 08 64.80 147.60 3 4.5 2101 1968 10 31 65.50 150.00 3 4.0 

4.5 mb CGS 4.0 mb CGS 

4.4 mb ISC 4.0 mb ISC 

2078 1968 09 17 64.70 147.60 3 3.7 2102 1968 11 02 64.90 149.40 3 4.4 

3.7 mb CGS 4.4 mb CGS 

3.7 mb ISC 4.3 mb ISC 

2079 1968 09 17 51.90 176.20 3 4.3 2103 1968 11 03 65.60 149.90 3 4.4 

4.3 mb CGS 4.4 mb CGS 

4.3 mb ISC 4.4 fib ISC 

2080 1968 09 18 64.80 147.60 3 4.1 2104 1968 11 03 65.64 150.06 3 3.9 

4.1 mb CGS 3.9 mb CGS 

4.1 mb ISC 3.9 mb ISC 

2084 1968 09 22 51.30 177.60 1 4.2 2107 1968 11 07 54.30 164.60 3 5.1 

4.2 mb CGS 5.1 fib CGS 

4.2 mb ISC 5.0 mb ISC 

2085 1968 09 24 61.44 149.87 4 3.7 2109 1968 11 11 57.30 155.30 5 5.3 

3.7 mb CGS 5.3 mb CGS 

3.7 mb ISC 5.0 mb ISC 

2087 1968 09 28 64.80 147.40 3 3.5 211~ 1968 12 09 51.80 176.80 2 4.2 

3.5 fib CGS 4.2 mb CGS 

3.5 fib ISC 4.1 fib ISC 

2089 1968 10 03 51.60 174.10 3 5.0 2113 1968 12 13 62.00 147.90 3 3.8 

4.4 Ms BRK 3.8 mb CGS 

5.0 fib CGS 3.8 fib ISC 

5.0 mb ISC 2114 1968 12 17 60.20 152.80 6 5.9 

2090 1968 10 07 61.40 150.30 4 4.2 5.9 mb CGS 

4.2 fib CGS 6.0 fib ISC 

4.1 mb ISC 6.5 Ms PAS 

2093 1968 10 29 65.40 150.10 8 6.0 2116 1968 12 26 51.50 177.80 2 4.2 

7.1 ML CGS 4.2 fib CGS 

6.0 mb CGS 4.2 mb ISC 

6.5 Ms CGS 2117 1968 12 28 63.00 148.20 3 4.6 

6.0 mb ISC 4.6 mb CGS 

6.8 Ms PAS 4.6 mb ISC 

2094 1968 10 29 65.55 150.26 3 4.2 2118 1968 12 29 61.70 152.20 3 4.5 

4.2 mb CGS 4.5 mb CGS 

4.2 mb ISC 4.5 mb ISC 

2095 1968 10 29 65.64 150.00 3 3.9 

3.9 mb CGS 2119 1968 12 30 57.60 151.40 3 5.4 

3.8 mb ISC 5.4 mb CGS 

2096 1968 10 30 65.58 150.13 3 4.0 5.4 mb ISC 

4.0 fib CGS 

4.1 mb ISC 2121 1969 01 03 51.20 179.40 2 5.8 

5.6 Ms BRK 

2097 1968 10 30 65.55 150.11 3 4.0 5.8 fib CGS 

4.0 fib CGS 5.2 Ms CGS 

4.0 mb ISC 5.7 mb ISC 

2098 1968 10 30 65.40 150.00 3 3.9 2124 1969 02 06 51.60 176.20 5 5.0 

3.9 fib CGS 5.0 mb CGS 

3.9 fib ISC 5.1 mb ISC 

Table 3-Magnitudes 173 
!Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 N Lon °W Io Magnitude 

2128 1969 03 14 65.40 150.10 3 4.4 2147 1969 06 09 62.40 149.00 3 4.1 

4.4 mb CGS 4.1 mb CGS 

4.3 mb ISC 4.1 mb ISC 

2129 1969 03 15 51.20 179.10 1 5.6 2148 1969 06 11 59.60 144.80 3 5.3 

4.5 Ms BRK 5.3 Ms BRK 

5.6 mb CGS 5.3 mb CGS 

5.2 Ms CGS 5.2 mb ISC 

5.5 mb ISC 2149 1969 06 11 59.59 144.76 3 4.9 

2130 1969 03 21 59.90 152.70 3 4.5 4.9 mb CGS 

4.5 mb CGS 4.9 mb ISC 

4.6 mb ISC 2150 1969 06 18 59.50 145.00 3 5.2 

2131 1969 03 31 51.90 178.00 1 4.5 5.2 mb CGS 

4.5 mb CGS 5.2 mb ISC 

4.5 mb ISC 2151 1969 06 19 54.20 164.00 3 5.0 

2132 1969 04 01 55.80 161.30 3 4.6 5.0 mb CGS 

4.6 mb CGS 5.0 mb ISC 

4.5 mb ISC 

2152 1969 06 21 65.20 147.80 4 4.1 

2133 1969 04 09 67.10 162.30 3 4.2 4.1 mb CGS 

4.2 mb CGS 3.9 mb ISC 

4.0 mb ISC 2153 1969 06 22 51.50 179.90 3 6.1 

2137 1969 04 19 60.30 146.00 3 5.1 5.25 Ms BRK 

5.1 mb CGS 6.1 mb CGS 

5.1 mb ISC 6.1 mb ISC 

2138 1969 04 22 57.00 154.00 4 3.7 2154 1969 06 22 51.58 179.97 3 4.9 

3.7 mb CGS 4.9 mb CGS 

3.7 mb ISC 5.0 mb ISC 

2139 1969 05 14 61.20 149.80 3 3.9 2155 1969 07 03 51.70 178.00E 3 5.1 

3.9 mb CGS 4.5 Ms BRK 

3.9 mb ISC 5.1 mb CGS 

2140 1969 05 14 51.30 179.90 5 6.2 5.1 mb ISC 

6.8 Ms BRK 2156 1969 07 17 64.10 147.60 4 4.9 

6.5 ML CGS 4.9 mb CGS 

6.2 mb CGS 4.8 fib ISC 

7.0 Ms CGS 

6.2 mb ISC 2157 1969 07 17 64.04 147.33 2 4.5 

4.5 fib CGS 

2141 1969 05 14 51.32 179.86 1 5.3 4.4 fib ISC 

5.3 mb CGS 2158 1969 07 17 63.98 147.48 3 4.2 

5.2 mb ISC 4.2 fib CGS 

2142 1969 05 14 51.45 179.73 1 4.6 4.1 mb ISC 

4.6 mb CGS 2159 1969 07 31 64.90 151.20 4 4.4 

4.6 mb ISC 4.4 mb CGS 

2143 1969 05 18 60.30 146.00 5 5.4 4.6 mb ISC 

5.0 Ms BRK 2161 1969 08 04 51.40 179.60 3 5.3 

5.4 mb CGS 5.3 mb CGS 

5.2 Ms CGS 5.2 Ms CGS 

5.4 mb ISC 5.3 mb ISC 

5.1 Ms PAS 

2144 1969 05 23 51.40 176.60 2 4.4 2162 1969 08 06 61.40 150.70 4 4.8 

4.4 mb CGS 4.8 mb CGS 

4.3 mb ISC 4.7 mb ISC 

2145 1969 05 28 60.30 145.80 3 3.3 2163 1969 08 25 65.10 147.40 4 4.0 

3.3 mb CGS 4.0 mb cas 

3.3 mb ISC 4.0 fib ISC 

174 U.S. Geological Survey Bulletin 1840 
IEq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

2164 1969 08 27 60.10 153.00 3 4.5 2180 1969 11 16 64.10 147.50 4 4.4 

4.5 mb CGS 4.7 ML CGS 

4.5 mb ISC 4.4 mb CGS 

2165 1969 09 12 51.30 179.20 3 5.0 4.5 mb ISC 

5.0 mb CGS 2181 1969 11 16 64.07 147.53 4 4.4 

5.1 mb ISC 4.7 ML CGS 

2166 1969 09 12 51.22 179.15 3 6.0 4.4 mb CGS 

6.3 ML CGS 4.5 mb ISC 

6.0 mb CGS 2182 1969 11 20 56.60 153.20 4 5.1 

6.6 Ms CGS 5.6 ML CGS 

5.9 mb ISC 5.1 mb CGS 

6.2 Ms PAS 5.5 Ms CGS 

2167 1969 09 15 51.90 175.50E 3 5.2 5.3 Ms GOL 

5.2 mb CGS 5.2 mb ISC 

5.1 Ms CGS 2183 1969 11 21 56.37 153.60 4 5.2 

5.4 mb ISC 4.2 ML CGS 

2169 1969 09 26 60.10 153.00 3 4.7 5.2 Illb CGS 

4.7 mb CGS 5.0 mb ISC 

4.7 mb ISC 2186 1969 11 24 56.20 153.60 4 5.5 

5.7 Ms BRK 

2170 1969 09 29 51.70 177.10 3 4.4 6.0 ML CGS 

4.4 mb CGS 5.5 mb CGS 

4.3 mb ISC 5.7 Ms CGS 

2171 1969 10 04 62.20 149.80 3 3.7 5.4 mb ISC 

3.7 mb CGS 

3.7 mb ISC 2189 1970 01 06 3 3.5 

2172 1969 10 10 64.80 147.20 3 3.9 3.5 ML CGS 

3.9 mb CGS 

3.9 mb ISC 2191 1970 01 16 60.30 152.70 5 5.6 

2173 1969 10 10 64.72 147.23 3 4.0 5.6 mb CGS 

4.0 mb CGS 5.5 mb ISC 

4.0 mb ISC 6.0 Ms PAS 

2174 1969 10 10 60.50 148.70 3 3.8 

3.8 mb CGS 2196 1970 02 27 50.10 179.60 3 6.0 

3.6 mb ISC 6.0 mb CGS 

5.9 Ms CGS 

2175 1969 10 16 62.50 151.30 3 4.0 6.0 mb ISC 

4.0 mb CGS 5.9 Ms PAS 

3.9 mb ISC 

2176 1969 10 18 52.50 173.50E 4 5.6 2197 1970 02 28 52.70 175.10 3 6.1 

5.6 mb CGS 6.1 mb CGS 

5.3 Ms CGS 6.0 mb ISC 

5.5 mb ISC 6.1 Ms PAS 

2177 1969 10 31 51.30 179.00 4 6.0 

6.0 mb CGS 2198 1970 03 11 57.50 153.90 5 6.0 

6.3 Ms CGS 6.4 ML CGS 

6.0 mb ISC 6.0 mb CGS 

6.3 Ms PAS 6.0 Ms CGS 

2178 1969 11 06 51.50 178.90 3 5.5 6.1 mb ISC 

5.5 mb CGS 6.5 Ms PAS 

5.7 Ms CGS 

5.75 Ms GOL 2199 1970 03 17 59.20 147.90 2 5.1 

5.5 mb ISC 5.5 ML CGS 

2179 1969 11 07 62.00 150.30 4 3.8 5.1 mb CGS 

3.8 mb CGS 4.8 Ms CGS 

3.8 mb ISC 5.0 mb ISC 

Table 3-Magnitudes 175 
Eq.No . Year MoDy Lat 0 NLon °W Io Magnitude Eq.No . Year MoDy Lat 0 NLon °W Io Magnitude 

2200 1970 03 19 51.30 173.80E 3 5.8 2218 1970 07 04 61.50 149.40 3 3.8 

5.8 fib CGS 3.8 fib CGS 

6.2 Ms CGS 3.8 fib ISC 

5.8 mb ISC 2219 1970 07 06 64.80 147.40 4 3.7 

6.5 Ms PAS 3.7 ML CGS 

2202 1970 04 03 2 3.2 2220 1970 07 13 60.40 152.00 3 4.8 

3.2 ML CGS 4.8 fib CGS 

2203 1970 04 05 61.43 152.25 4 3.9 4.8 fib ISC 

3.9 fib CGS 2221 1970 07 18 51.40 178.50 4 5.7 

2205 1970 04 11 59.70 142.70 3 5.2 5.7 fib CGS 

5.8 ML CGS 5.9 Ms CGS 

5.2 fib CGS 5.8 fib ISC 

6.2 Ms CGS 5.5 Ms PAS 

5.3 fib ISC 2222 1970 07 18 51.03 178.38 4 4.4 

6.2 Ms PAS 4.4 fib CGS 

2207 1970 04 16 59.80 142.60 4 5.5 4.5 fib ISC 

6.2 ML CGS 

5.5 fib CGS 2223 1970 07 19 3 3.3 

6.8 Ms CGS 3.3 ML CGS 

5.6 fib ISC 2225 1970 07 30 60.60 148.60 3 4.7 

6.8 Ms PAS 4.7 ML CGS 

4.7 mb CGS 

2208 1970 04 16 59.85 142.56 3 4.1 4.6 mb ISC 

4.7 ML CGS 2226 1970 08 02 51.70 176.90 4 4.0 

4.1 fib CGS 4.0 mb CGS 

4.1 fib ISC 4.0 mb ISC 

2209 1970 04 18 59.90 152.80 5 5.7 2227 1970 08 12 51.40 179.20 2 4.6 

5.7 fib CGS 5.0 ML CGS 

5.4 fib ISC 4.6 fib CGS 

2210 1970 04 19 59.60 142.80 3 5.8 4.4 mb ISC 

5.5 Ms BRK 2228 1970 08 13 51.80 175.50 1 4.1 

5.8 ML CGS 4.1 mb CGS 

5.8 fib CGS 4.2 fib ISC 

6.0 Ms CGS 

5.6 fib ISC 2229 1970 08 13 1 4.4 

2211 1970 04 25 65.50 150.00 3 3.2 4.4 ML ADK 

4.1 ML CGS 2230 1970 08 14 64.90 147.80 5 5.0 

3.2 fib CGS 5.6 ML CGS 

2212 1970 05 01 63.60 149.40 4 4.0 5.0 fib CGS 

4.2 ML CGS 5.0 Ms CGS 

4.0 fib CGS 4.9 mb ISC 

3.9 fib ISC 2231 1970 08 14 64.73 147.68 4 4.0 

4.0 ML CGS 

2213 1970 05 10 61.70 150.00 4 3.7 3.9 fib ISC 

3.7 fib CGS 2234 1970 08 18 64.70 147.50 4 3.4 

3.9 fib ISC 3.4 ML CGS 

2214 1970 06 02 61.60 151.70 4 5.5 

4.75 Ms BRK 2235 1970 08 18 60.70 145.38 4 5.6 

5.5 fib CGS 5.9 ML CGS 

5.5 fib ISC 5.6 fib CGS 

2215 1970 06 09 64.90 148.80 3 4.1 5.9 Ms CGS 

4.1 ML CGS 5.8 fib ISC 

6.0 Ms PAS 

2217 1970 06 19 60.30 151.50 3 3.8 

3.8 fib CGS 2241 1970 09 02 64.60 150.90 4 4.6 

3.8 fib ISC 4.6 ML CGS 

176 U.S. Geological Survey Bulletin 1840 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

2243 1970 09 03 64.60 150.90 3 3.9 2268 1970 12 01 51.40 175.30 2 5.6 

4.6 ML CGS 5.7 mb ISC 

3.9 mb CGS 5.6 mb NOS 

3.9 IDb ISC 5.8 Ms NOS 

2244 1970 09 17 62.80 150.40 2 3.9 6.0 Ms PAS 

3.9 IDb CGS 2269 1970 12 02 51.40 175.20 1 5.4 

3.8 IDb ISC 5.5 fib ISC 

2245 1970 09 19 60.90 151.50 3 4.6 5.4 IDb NOS 

4.6 IDb CGS 5.5 Ms PAS 

4.5 IDb ISC 2270 1970 12 02 51.43 175.24 1 5.2 

2246 1970 09 23 51.40 179.40 2 5.2 5.1 fib ISC 

5.2 IDb CGS 5.2 IUb NOS 

5.2 IDb ISC 2272 1970 12 15 52.40 176.20 1 4.8 

2249 1970 10 04 51.60 178.90E 3 3.5 4.8 fib ISC 

3.4 mb ISC 4.8 fib NOS 

3.5 IDb NOS 2273 1970 12 20 63.10 151.40 3 5.3 

5.2 mb ISC 

2250 1970 10 09 51.40 178.40 1 5.2 5.3 fib NOS 

5.3 mb ISC 

5.2 mb NOS 2274 1970 12 24 51.50 178.30 3 5.3 

2252 1970 10 16 62.00 146.60 3 3.9 5.2 mb ISC 

3.9 IDb ISC 5.3 IDb NOS 

3.9 IDb NOS 2275 1970 12 25 51.80 175.20 1 4.7 

2254 1970 10 26 61.50 145.90 4 4.7 4.7 fib ISC 

4.7 mb ISC 4.7 IDb NOS 

4.7 IDb NOS 2276 1970 12 28 61.60 149.60 3 3.8 

2257 1970 10 31 62.19 148.68 3 4.2 4.0 IDb ISC 

4.2 fib ISC 3.8 fib NOS 

4.2 IDb NOS 22'17 1971 01 OS 61.42 147.55 3 4.5 

2258 1970 10 31 51.20 179.40 1 5.0 4.5 fib NOS 

5.0 IDb ISC 2278 1971 01 05 3 3.5 

5.0 IDb NOS 3.5 ML NOS 

2259 1970 11 01 60.30 154.20 3 4.4 2279 1971 01 07 52.44 173.32 4 5.8 

4.4 IDb ISC 5.9 Ms BRK 

4.4 mb NOS 5.7 IDb ISC 

2260 1970 11 03 62.00 151.20 5 5.6 5.8 fib NOS 

5.5 IDb ISC 2280 1971 01 08 1 4.0 

5.6 IDb NOS 4.0 ML ADK 

2282 1971 01 25 51.47 177.69 5 5.9 

2261 1970 11 03 62.03 150.69 3 3.7 5.9 IDb ISC 

3.7 IDb ISC 5.9 fib NOS 

3.7 IDb NOS 6.3 Ms NOS 

6.3 Ms PAS 

2263 1970 11 13 51.60 175.30 1 4.9 2283 1971 01 25 3 3.0 

5.0 fib ISC 3.0 ML NOS 

4.9 IDb NOS 

2284 1971 01 26 51.67 174.92 3 5.4 

2265 1970 11 20 51.40 178.30 1 5.1 5.3 IDb ISC 

4.8 ML ADK 5.4 fib NOS 

5.1 fib ISC 5.5 Ms NOS 

5.1 IDb NOS 

2286 1971 02 01 62.33 145.68 5 4.6 

2267 1970 11 30 59.70 150.60 3 4.0 4.3 fib ISC 

4.2 IDb ISC 

4.0 fib NOS 

4.6 ML NOS 

4.6 IDb NOS 

Table 3-Magnitudes 177 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

2287 1971 02 02 62.23 151.15 3 3.5 2309 1971 04 01 60.09 149.24 4 4.3 

3.5 rnb NOS 4.2 mb ISC 

2291 1971 02 07 51.36 176.72 5 6.0 4.0 ML NOS 

5.8 mb ISC 4.3 mb NOS 

6.0 mb NOS 2310 1971 04 02 61.44 150.09 3 3.7 

6.5 Ms PAS 3.7 ML NOS 

2293 1971 02 07 51.20 177.10 3 5.8 2311 1971 04 09 51.52 178.78E 3 4.9 

5.5 rnb ISC 4.8 mb ISC 

5.8 rnb NOS 4.9 mb NOS 

2294 1971 02 07 51.75 177.26 1 4.5 2312 1971 04 13 1 3.7 

4.5 rnb NOS 3.7 ML ADK 

2295 1971 02 07 51.20 176.96 1 5.2 2313 1971 04 14 64.90 147.70 5 4.1 

5.0 rnb ISC 4.1 ML NOS 

5.2 mb NOS 4.1 mb NOS 

2296 1971 02 07 51.10 177.00 2 5.4 2314 1971 04 15 62.21 150.72 1 3.3 

5.3 mb ISC 3.3 ML NOS 

5.4 mb NOS 2315 1971 04 16 64.60 147.13 3 4.2 

2297 1971 02 08 51.29 178.83 1 5.2 4.2 ML NOS 

5.2 mb ISC 2316 1971 04 24 3 3.2 

5.2 mb NOS 3.2 ML NOS 

2300 1971 03 02 51.81 176.80 1 4.5 2317 1971 04 30 51.70 179.93E 4 5.2 

4.5 mb ISC 5.2 mb ISC 

4.5 mb NOS 5.2 mb NOS 

2301 1971 03 10 1 3.5 2318 1971 04 30 52.80 172.50E 2 5.5 

3.5 ML ADK 5.5 mb ISC 

2302 1971 03 11 59.33 146.65 2 5.0 5.5 mb NOS 

4.9 mb ISC 5.0 Ms NOS 

5.1 ML NOS 

5.0 mb NOS 2319 1971 05 01 64.90 148.00 4 3.3 

3.3 ML NOS 

2303 1971 03 19 1 4.5 2320 1971 05 02 51.43 177.21 4 6.0 

4.5 ML ADK 6.0 mb ISC 

2304 1971 03 25 52.52 176.76 1 5.3 6.0 mb NOS 

5.2 mb ISC 7.1 Ms NOS 

4.5 ML NOS 6.8 Ms PAS 

5.3 mb NOS 2321 1971 05 02 51.54 177.21 3 5.3 

2305 1971 03 25 1 5.0 5.3 mb ISC 

5.0 ML NOS 5.3 mb NOS 

2323 1971 05 10 51.42 177.24 2 5.3 

2306 1971 03 26 60.34 140.99 4 5.5 5.3 mb ISC 

5.8 mb ISC 5.3 mb NOS 

5.9 ML NOS 2326 1971 05 18 61.71 149.56 2 2.9 

5.5 mb NOS 2.9 ML NOS 

5.7 Ms NOS 

2327 1971 05 18 60.00 151.90 2 3.9 

2307 1971 03 27 52.55 174.53 1 5.6 3.9 mb NOS 

5.6 mb ISC 

5.6 mb NOS 2328 1971 05 21 52.55 173.22 2 5.7 

5.7 mb ISC 

2308 1971 03 30 51.19 177.49 3 5.7 5.7 ML NOS 

4.9 Ms BRK 5.7 mb NOS 

5.7 mb ISC 5.3 Ms NOS 

5.1 ML NOS 

5.7 mb NOS 2329 1971 05 31 1 3.5 

5.4 Ms NOS 3.5 ML ADK 

178 U.S. Geological Survey Bulletin 1840 
IEq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 N Lon °W Io Magnitude 

2330 1971 06 02 61.03 151.26 4 5.0 2352 1971 09 04 54.98 163.36 4 5.8 

4.8 IDb ISC 5.8 mb ERL 

5.5 ML NOS 5.7 mb ISC 

5.0 IDb NOS 2353 1971 09 06 64.79 147.68 3 3.2 

2331 1971 06 07 51.53 176.92 1 4.3 3.2 ML ERL 

4.2 IDb ISC 2354. 1971 09 16 51.79 175.64 1 4.6 

4.3 IDb NOS 4.6 mb ERL 

2333 1971 06 11 51.49 176.08E 4 5.9 4.6 IDb ISC 

5.8 IDb ISC 2355 1971 09 18 51.89 178.63E 3 4.6 

5.9 IDb NOS 4.6 IDb ERL 

6.5 Ms NOS 4.5 IDb ISC 

6.1 Ms PAS 2356 1971 09 19 51.77 176.94 3 4.2 

2335 1971 06 17 61.80 149.80 1 3.8 4.2 IDb ERL 

3.8 ML NOS 4.2 mb ISC 

2336 1971 06 21 51.68 177.25 2 4.6 

4.5 IDb ISC 2360 1971 09 30 51.31 178.78E 3 5.0 

4.6 IDb NOS 5.0 mb ERL 

5.0 IDb ISC 

2337 1971 06 29 54.65 161.59 4 5.1 2361 1971 10 12 52.64 174.19E 5 4.4 

5.1 IDb ISC 4.4 mb ERL 

5.1 ML NOS 4.4 IDb ISC 

5.2 IDb NOS 2362 1971 10 13 51.95 179.59 1 5.3 

2338 1971 06 29 61.35 145.20 1 3.9 5.3 mb ERL 

4.5 ML NOS 5.3 mb ISO 

3.9 mb NOS 

234.0 1971 07 15 54.22 133.73 3 5.2 2363 1971 10 15 45.45 176.69 1 4.9 

5.3 ML EPB 4.7 ML ERL 

4.9 IDb EPB 4.9 mb ERL 

5.2 IDb ERL 4.9 IDb ISC 

4.9 IDb ISC 

2342 1971 07 25 52.15 173.10E 1 5.8 2364 1971 10 29 60.22 153.46 3 4.7 

5.8 IDb ERL 4.7 IDb ERL 

6.3 Ms ERL 4.6 IDb ISC 

5.8 IDb ISC 

6.0 Ms PAS 2365 1971 11 03 52.02 177.31 1 4.4 

234.3 1971 07 26 63.28 149.73 4 4.1 4.4 mb ERL 

4.4 ML ERL 4.4 mb ISC 

4.1 IDb ERL 

2366 1971 11 06 51.47 179.11E 4 6.8 

234.5 1971 08 05 55.65 165.00 5 5.2 6.8 IDb ERL 

5.2 mb ERL 5.7 Ms ERL 

5.1 IDb ISC 7.4 Ms PAS 

234.6 1971 08 05 51.40 176.74 2 4.1 

4.1 IDb ERL 2367 1971 11 15 51.68 176.14 4 5.2 

234.7 1971 08 10 65.47 149.96 3 4.3 5.2 IDb ERL 

4.3 ML ERL 5.2 mb ISC 

4.2 IDb ISC 

2348 1971 08 13 51.80 176.54 2 4.1 2368 1971 11 22 52.27 174.32E 4 5.6 

4.1 IDb ERL 5.6 IDb ERL 

234.9 1971 08 21 54.28 162.49 3 5.2 5.5 Ms ERL 

5.2 IDb ERL 5.7 IDb ISC 

5.2 IDb ISC 6.0 Ms PAS 

2351 1971 08 27 51.40 177.80 1 5.0 2369 1971 11 23 51.85 176.19 5 4.8 

5.0 IDb ERL 4.8 IDb ERL 

4.9 IDb ISC 4.8 IDb ISC 

Table 3-Magnitudes 179 
Eq.No Year MoDv Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 N Lon °W Io Magnitude 

2370 1971 11 24 52.90 159.20E 4 6.3 2390 1972 02 01 51.77 177.66E 2 5.2 

7.5 IDb BD 5.2 mb ERL 

7.4 Ms BD 5.1 mb ISC 

7.5 Ms BRK 2391 1972 02 13 59.94 154.20 1 4.9 

6.3 IDb ERL 4.9 mb ERL 

6.4 mb ISC 4.8 mb ISC 

7.4 mb ·KA1 2392 1972 02 15 51.41 177.45 4 4.9 

7.2 Ms SSR 4.9 mb ERL 

2371 1971 11 24 1 3.8 5.1 mb .ISC 

3.8 ML ADK 2393 1972 02 21 55.90 158.27 5 5.7 

2372 1971 11 29 64.82 147.34 4 3.1 5.4 Ms BRK 

3.1 ML ERL 5.7 IDb ERL 

2373 1971 11 30 51.11 179.54E 3 5.0 5.7 IDb ISC 

5.0 mb ERL 2394 1972 02 22 51.40 175.98 2 4.2 

4.7 Ms ERL 4.2 mb ERL 

5.0 mb ISC 4.2 mb ISC 

2375 1971 12 01 61.65 149.28 4 3.7 

3.1 ML ERL 2396 1972 02 24 55.83 158.2·5 4 5.3 

3.7 mb ERL 5.3 mb ERL 

5.3 mb ISC 

2376 1971 12 03 51.63 177.18 3 4.7 2397 1972 02 25 61.16 149.41 3 3.5 

4.7 mb ERL 3.5 ML ERL 

4.8 IDb ISC 3.5 mb ERL 

2377 1971 12 08 51.72 178.43E 2 5.2 2398 1972 03 02 51.40 177.52 2 4.2 

5.2 mb ERL 4.2 mb ERL 

5.2 mb ISC 4.2 IDb ISC 

2379 1971 12 17 55.10 161.18 3 4.5 2399 1972 03 14 59.99 147.70 3 4.4 

4.5 mb ERL 4.3 ML ERL 

2380 1971 12 23 60.66 151.57 3 3.7 4.4 mb ERL 

3.7 mb ERL 4.4 IDb ISC 

2381 1971 12 26 50.57 175.14 2 5.2 2400 1972 03 19 62.41 150.58 3 3.2 

5.2 IDb ERL 3.2 ML ERL 

5.4 IDb ISC 

2401 1972 03 20 51.29 179.22 4 6.0 

2382 1971 12 30 61.15 150.36 4 4.1 5.2 Ms BRK 

3.7 ML ERL 6.0 mb ERL 

4.1 IDb ERL 5.4 Ms ERL 

2383 1971 12 31 51.90 179.93 2 5.4 6.0 IDb ISC 

5.4 mb ERL 2402 1972 03 21 50.01 176.17 3 5.4 

5.4 mb ISC 5.4 IDb ERL 

2384 1972 01 03 51.14 178.90E 2 5.5 4.4 Ms ERL 

5.5 mb ERL 2404 1972 03 24 56.14 157.18 4 6.0 

5.4 Ms ERL 6.0 IDb ERL 

5.4 IDb ISC 6.0 IDb ISC 

2385 1972 01 14 64.69 147.61 3 4.1 2408 1972 04 06 52.05 174.98E 5 4.8 

4.1 mb ERL 4.8 mb ERL 

2387 1972 01 23 52.03 178.67 3 4.9 4.7 mb ISC 

4.9 mb ERL 

4.8 IDb ISC 2409 1972 04 07 60.13 152.75 5 5.1 

5.1 IDb ERL 

2388 1972 01 30 51.80 176.59 3 4.4 4.9 IDb ISC 

4.4 mb ERL 

4.5 mb ISC 2410 1972 04 16 63.53 147.71 3 4.1 

4.6 ML ERL 

2389 1972 01 31 62.07 150.48 2 3.7 4.1 IDb ERL 

3.7 IDb ERL 4.0 IDb ISC 

180 U.S. Geological Survey Bulletin 1840 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude IEQ.No. Year MoDy Lat 0 NLon °W Io Magnitude 

2411 1972 04 17 51.55 177.37 3 4.6 2437 1972 07 28 52.57 173.21E 5 5.3 

4.6 mb ERL 5.3 mb ERL 

4.7 mb ISC 4.7 Ms ERL 

2412 1972 04 20 60.19 152.14 5 4.7 5.3 mb ISC 

4.7 mb ERL 2438 1972 07 30 56.82 135.68 7 6.5 

2413 1972 04 21 54.01 166.85 5 5.8 7.1 fib BD 

5.8 mb ERL 7.9 Ms BD 

5.8 mb ISC 6.5 mb ERL 

2414 1972 04 24 2 4.4 7.6 Ms ERL 

4.4 ML ADK 6.2 mb ISC 

2415 1972 04 25 61.98 148.82 3 4.6 7.4 Ms KA1 

4.6 mb ERL 7.4 mb KA2 

4.7 mb ISC 7.5 Ms PRU 

2441 1972 08 03 63.39 147.59 2 3.8 

2418 1972 05 03 51.45 179.21 2 5.3 3.7 ML ERL 

5.3 mb ERL 3.8 ffib ERL 

5.1 mb ISC 3.6 mb ISC 

2422 1972 05 12 66.12 157.19 5 4.0 2442 1972 08 03 51.20 178.12 6 5.8 

4.0 mb ERL 5.8 mb ERL 

4.2 mb ISC 6.2 Ms ERL 

2423 1972 05 20 57.83 153.82 2 5.2 5.7 mb ISC 

5.2 mb ERL 6.1 Ms PAS 

2425 1972 06 06 51.58 178.27 3 5.3 2444 1972 08 03 51.21 177.87 3 4.8 

5.6 ML ERL 4.8 mb ERL 

5.3 mb ERL 4.9 mb ISC 

5.4 mb ISC 

2427 1972 06 12 53.35 166.79 3 5.8 2445 1972 08 03 51.21 178.15 3 5.5 

5.8 Ms BRK 5.5 mb ERL 

5.8 mb ERL 5.4 Ms ERL 

5.8 Ms ERL 5.6 mb ISC 

5.8 mb ISC 2446 1972 08 03 51.20 177.96 4 5.4 

5.4 mb ERL 

2428 1972 06 14 60.50 153.41 3 5.2 5.4 fib ISC 

5.2 mb ERL 

5.0 mb ISC 2447 1972 08 04 51.50 178.4 7 2 5.0 

2429 1972 06 19 52.19 175.03E 5 5.3 5.0 mb ERL 

5.3 mb ERL 5.0 mb ISC 

5.3 mb ISC 

2430 1972 06 19 52.05 175.15E 3 4.7 2448 1972 08 04 56.22 135.53 2 5.1 

4.7 mb ERL 5.1 mb ERL 

4.7 mb ISC 5.0 Ms ERL 

4.9 mb ISC 

2431 1972 06 22 61.42 147.49 2 4.5 

4.5 mb ERL 2449 1972 08 04 56.20 135.34 5 5.6 

4.3 mb ISC 5.6 mb ERL 

5.8 Ms ERL 

2433 1972 07 20 61.15 146.65 4 3.5 5.5 mb ISC 

3.5 mb ERL 6.0 Ms PAS 

2435 1972 07 25 51.23 176.79 2 4.0 2450 1972 08 04 51.17 177.99 2 4.2 

4.0 mb ERL 4.2 mb ERL 

3.9 mb ISC 4.5 mb ISC 

2436 1972 07 27 51.08 179.26 2 4.8 2454 1972 08 08 51.26 177.95 3 4.9 

4.8 mb ERL 4.9 mb ERL 

4.8 mb ISC 4.9 mb ISC 

Table 3-Magnitudes 181 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

2457 1972 08 12 51.38 179.32 3 5.9 2483 1972 10 14 51.75 175.30 4 5.1 

5.8 ML ERL 5.1 fib ERL 

5.9 fib ERL 5.1 fib ISC 

5.7 Ms ERL 2484 1972 10 15 51.78 175.35 3 4.9 

5.8 fib ISC 4.9 fib ERL 

5.4 Ms PAS 4.8 mb ISC 

2458 1972 08 15 56.25 135.50 6 5.6 2486 1972 10 21 63.15 151.06 4 5.4 

5.6 fib ERL 5.4 fib ERL 

4.8 Ms ERL 5.3 mb ISO 

5.4 mb ISC 2488 1972 10 25 61.30 150.50 3 3.2 

2459 1972 08 15 65.15 148.75 4 4.3 3.2 ML ERL 

4.3 mb ERL 2489 1972 10 27 61.52 150.35 3 3.7 

4.5 Ms ERL 3.7 mb ERL 

4.3 mb ISC 

2461 1972 08 23 51.43 176.64 2 3.8 2491 1972 10 30 51.97 177.55 3 4.1 

3.8 mb ERL 4.1 fib ERL 

2462 1972 08 23 58.25 153.58 4 5.5 4.3 fib ISC 

5.5 fib ERL 2493 1972 11 02 64.56 147.63 3 3.7 

5.5 mb ISC 3.7 ML ERL 

2494 1972 11 13 53.79 169.04 3 5.1 

2465 1972 08 28 51.37 179.22 4 5.5 5.1 fib ERL 

5.5 mb ERL 5.0 fib ISO 

4.6 Ms ERL 2495 1972 11 17 56.04 135.53 3 5.0 

5.4 mb ISC 5.0 fib ERL 

2469 1972 09 01 51.38 178.13 5 5.2 4.8 fib ISO 

5.2 mb ERL 2496 1972 11 21 52.45 173.61E 5 5.5 

5.0 mb ISO 5.5 mb ERL 

2471 1972 09 11 59.63 148.94 2 5.1 5.5 mb ISO 

5.0 ML ERL 

5.1 mb ERL 2497 1972 11 28 65.75 145.69 4 4.1 

5.0 mb ISO 5.3 ML ERL 

2472 1972 09 13 51.36 175.43 2 4.2 4.1 mb ERL 

4.2 mb ERL 5.0 Ms ERL 

2474 1972 09 20 51.79 174.02E 2 5.0 4.2 mb ISO 

5.0 mb ERL 2498 1972 11 30 51.99 175.35 2 4.4 

5.3 Ms ERL 4.4 mb ERL 

5.0 mb ISO 4.5 fib ISO 

2500 1972 12 15 60.74 151.37 2 4.4 

2475 1972 09 23 51.23 175.01 2 4.8 4.4 fib ERL 

4.8 mb ERL 2504 1972 12 23 51.27 179.12E 4 5.2 

4.7 mb ISC 5.2 fib ERL 

2477 1972 10 01 62.74 149.08 2 4.7 4.9 Ms ERL 

4.7 mb ERL 5.1 fib ISO 

4.6 mb ISC 

2478 1972 10 01 51.69 177.07 4 5.2 2505 1972 12 26 51.67 176.28 6 5.5 

5.2 fib ERL 5.5 fib ERL 

5.1 mb ISO 5.4 mb ISO 

2480 1972 10 04 62.90 159.59 5 4.6 2508 1973 01 09 60.31 146.00 3 5.1 

4.6 ML ERL 4.8 ML ERL 

4.6 mb ERL 

4.0 fib ISC 

5.1 fib ERL 

5.1 mb ISO 

2482 1972 10 13 51.73 175.89 4 4.7 2509 1973 01 09 51.41 178.21 2 5.1 

4.7 mb ERL 5.1 fib ERL 

4.7 mb ISO 5.0 mb ISO 

182 U.S. Geological Survey Bulletin 1840 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

2510 1973 01 10 55.22 159.94 2 4.2 2534 1973 04 06 51.42 178.44 2 5.0 

4.2 fib ERL 5.0 fib ERL 

4.3 fib ISC 5.0 fib ISC 

2511 1973 01 13 51.77 177.00 5 5.4 2535 1973 04 06 61.23 149.47 2 3.8 

5.4 fib ERL 3.6 ML ERL 

5.3 fib ISC 3.8 fib ERL 

2512 1973 01 13 51.74 176.98 4 4.7 2536 1973 04 11 64.61 160.05 5 4.2 

4.7 fib ERL 4.2 fib ERL 

4.9 fib ISC 4.2 fib ISC 

2514 1973 01 16 54.12 165.54 3 5.3 2537 1973 04 11 2 4.6 

5.3 fib ERL 4.6 ML ERL 

5.2 fib ISC 2538 1973 04 16 51.12 178.83 4 5.5 

2516 1973 01 17 52.36 175.92 1 3.9 5.S mb ERL 

3.9 fib ERL S.5 fib ISC 

2517 1973 02 01 51.79 176.26E 2 5.3 2539 1973 04 22 S1.13 179.84 3 4.8 

5.3 fib ERL 4.8 fib ERL 

5.3 fib ISC 4.8 fib ISC 

2518 1973 02 07 61.26 150.48 2 3.6 2541 1973 04 30 60.95 1S1.13 3 3.4 

3.4 ML ERL 3.4 mb ERL 

3.6 fib ERL 2542 1973 04 30 51.60 177.79E 3 4.8 

2519 1973 02 08 61.76 150.18 3 3.8 4.8 fib ERL 

3.8 fib ERL 4.8 fib ISC 

2520 1973 02 13 51.25 179.22 2 5.4 2544 1973 OS 10 S1.37 179.52 3 5.3 

5.4 fib ERL 5.3 fib ERL 

4.7 Ms ERL 5.3 fib ISC 

5.3 fib ISC 2545 1973 05 15 2 4.2 

2522 1973 03 11 64.83 147.81 3 3.0 4.2 ML ADK 

3.0 ML ERL 

2546 1973 OS 18 63.07 150.95 2 4.7 

2524 1973 03 19 52.84 173. 77E 5 5.8 4.7 mb ERL 

5.8 fib ERL 2550 1973 05 20 51.70 176.68 4 4.6 

5.7 fib ISC 4.6 fib ERL 

2527 1973 03 22 51.18 179.24E 4 4.9 4.7 fib ISC 

4.9 fib ERL 

5.0 fib ISC 2551 1973 05 20 60.97 152.44 2 4.9 

2528 1973 03 23 51.30 174.22E 3 5.8 4.9 fib ERL 

5.8 fib ERL 4.9 fib ISC 

5.9 Ms ERL 

5.7 fib ISC 2552 1973 05 24 51.63 173.44 4 5.4 

2529 1973 03 26 52.82 173.82E 2 5.0 5.4 fib ERL 

5.0 fib ERL 5.1 Ms ERL 

4.9 fib ISC 5.5 fib ISC 

2530 1973 03 27 52.58 172.87E 5 5.6 

5.6 fib ERL 2553 1973 05 26 51.73 175.42 2 4.6 

5.2 Ms ERL 4.6 Plb ERL 

5.6 fib ISC 4.6 mb ISC 

2531 1973 03 28 64.77 147.54 4 3.3 2554 1973 05 26 51.37 179.74 5 5.8 

3.3 ML ERL 5.8 fib ERL 

2532 1973 04 02 51.94 177.40 4 5.2 5.7 Ms ERL 

5.2 fib ERL 5.7 mb ISC 

5.1 fib ISC 

2555 1973 05 26 60.16 153.96 2 4.4 

2533 1973 04 05 51.98 176.01 2 3.9 4.4 fib ERL 

3.9 fib ERL 4.3 fib ISC 

Table 3-Magnitudes 183 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

2556 1973 05 29 54.01 163.76 5 6.0 2573 1973 07 05 57.91 137.90 4 5.4 

5.3 Ms BRK 4.7 Ms BRK 

6.0 mb ERL 5.4 mb ERL 

5.5 Ms ERL 4.9 Ms ERL 

6.1 mb ISC 5.4 mb ISC 

255'1 1973 05 31 1 4.3 25'15 1973 07 11 51.97 176.10 4 5.1 

4.3 ML ADK 5.4 ML ADK 

2558 1973 06 01 65.06 147.26 5 3.6 5.1 mb ERL 

4.2 ML ERL 4.9 mb ISC 

3.6 mb ERL 2576 1973 07 12 52.22 174.21E 5 5.2 

2560 1973 06 15 51.30 179.39 4 5.8 5.2 mb ERL 

5.7 ML ERL 4.3 Ms ERL 

5.8 IDb ERL 5.1 mb ISC 

4.8 Ms ERL 2577 1973 07 15 61.57 150.30 1 3.1 

5.8 mb ISC 3.1 ML ERL 

2561 1973 06 15 51.27 179.42 3 5.4 2579 1973 08 06 51.53 178.05 2 4.6 

5.4 IDb ERL 4.6 mb ERL 

5.4 mb ISC 4.6 mb ISC 

2562 1973 06 18 65.14 147.02 4 4.0 2580 1973 08 16 51.29 176.64 4 5.6 

3.8 ML ERL 5.6 mb ERL 

4.0 IDb ERL 5.8 Ms ERL 

2563 1973 06 19 64.79 147.55 4 3.8 5.5 mb ISC 

3.8 ML ERL 2581 1973 08 16 51.30 176.64 3 5.2 

2564 1973 06 23 51.88 176.90 5 5.5 5.2 mb ERL 

4.6 Ms BRK 5.0 mb ISC 

5.5 IDb ERL 2582 1973 08 16 51.45 176.63 3 5.6 

5.4 IDb ISC 5.6 mu ERL 

2566 1973 06 25 61.67 150.06 3 3.4 5.3 mb ISC 

3.1 ML ERL 2583 1973 08 17 51.38 176.61 2 4.9 

3.4 mb ERL 4.9 mb ERL 

256'1 1973 06 26 52.24 174.11E 2 4.9 4.8 mb ISC 

4.9 IDb ERL 2584 1973 08 22 62.62 149.25 3 3.6 

4.5 Ms ERL 3.6 mb GS 

4.9 IDb ISC 

2585 1973 08 22 57.07 154.10 3 5.9 

2568 1973 06 30 52.75 172.26E 3 5.4 5.5 Ms BRK 

5.4 IDb ERL 5.9 IDb GS 

4.8 Ms ERL 5.6 Ms GS 

5.4 IDb ISC 5.8 IDb ISC 

2569 1973 07 01 57.84 137.33 5 6.1 2586 1973 08 26 51.25 179.26 3 5.2 

6.1 IDb ERL 5.2 mb GS 

6.7 Ms ERL 5.3 Ms GS 

6.2 IDb ISC 5.2 mb ISC 

6.7 Ms PAS 

25'10 1973 07 01 57.78 137.29 3 5.2 2587 1973 08 27 51.46 178.39 4 5.2 

5.2 mb ERL 

5.2 IDb ISC 

5.2 IDb GS 

5.0 IDb ISC 

25'11 1973 07 03 57.98 138.02 5 6.0 

6.0 mb ERL 

6.0 Ms ERL 

6.1 mb ISC 

2588 1973 08 27 51.31 175.94 2 4.7 

4.7 IDb GS 

4.4 mb ISC 

6.4 Ms PAS 

2589 1973 08 27 51.70 173.69 2 4.8 

2572 1973 07 04 64.77 147.53 3 3.2 

3.2 ML ERL 

4.8 IDb GS 

4.8 mb ISC 

184 U.S. Geological Survey Bulletin 1840 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

2591 1973 08 31 61.10 147.41 8 5.1 2618 1973 12 03 2 4.4 

5.1 mb GS 4.4 ML ADK 

5.0 Ms GS 2619 1973 12 09 51.36 179.14 2 4.8 

5.0 mb ISC 4.8 mb GS 

2592 1973 09 06 61.04 146.83 3 5.5 4.8 mb ISC 

5.5 mb GS 2620 1973 12 09 58.40 151.85 3 4.2 

5.3 Ms GS 4.2 mb GS 

5.5 mb ISC 4.2 mb ISC 

5.5 MLPMR 2622 1973 12 14 51.32 178.30 3 5.2 

2593 1973 09 08 51.30 179.23 2 4.9 5.4 ML ADK 

4.9 mb GS 5.2 mb GS 

4.9 mb ISC 5.1 mb ISC 

2597 1973 10 05 66.31 157.37 4 4.1 2624 1973 12 14 51.41 177.87 5 5.8 

4.1 mb GS 5.8 ML ADK 

4.1 mb ISC 5.8 mb GS 

2598 1973 10 05 3 4.4 5.8 mb ISC 

4.4 ML ADK 

2625 1973 12 17 2 4.3 

2599 1973 10 08 3 4.4 4.3 ML ADK 

4.4 ML ADK 2629 1974 01 24 61.59 147.63 5 4.8 

2600 1973 11 01 62.00 150.62 4 3.9 4.8 mb GS 

3.9 mb GS 4.8 mb ISC 

3.9 mb ISC 5.1 MLPMR 

2603 1973 11 06 1 3.5 2632 1974 02 01 62.14 147.83 2 3.5 

3.5 ML ADK 3.5 mb GS 

2604 1973 11 06 51.62 175.40 4 5.8 2633 1974 02 02 61.46 147.47 2 3.8 

5.7 ML ADK 3.8 mb GS 

5.8 mb GS 

6.4 Ms GS 2634 1974 02 02 61.60 147.60 2 5.1 

5.7 mb ISC 5.1 mb GS 

6.2 Ms PAS 4.7 Ms GS 

2605 1973 11 06 2 4.5 5.2 mb ISC 

4.5 ML ADK 

5.1 mb ISC 2635 1974 02 05 62.70 148.85 5 5.0 

5.0 mb GS 

2607 1973 11 06 51.58 175.25 4 5.9 4.8 mb ISC 

5.9 mb GS 

6.3 Ms GS 2636 1974 02 06 53.80 164.67 5 5.9 

5.8 mb ISC 5.9 mb GS 

6.2 Ms PAS 6.5 Ms GS 

2608 1973 11 06 51.79 175.31 3 4.5 5.9 mb ISC 

4.5 mb GS 6.3 Ms PAS 

4.6 mb ISC 

2609 1973 11 07 52.61 175.09 2 4.6 2637 1974 02 16 51.26 179.29 2 4.2 

4.6 mb GS 4.9 ML ADK 

4.7 mb ISC 4.2 mb GS 

2610 1973 11 07 2 4.5 4.2 mb ISC 

4.5 ML ADK 

2612 1973 11 08 51.09 175.18 1 3.9 2640 1974 03 10 50.53 175.11 2 4.7 

4.1 ML ADK 4.8 ML ADK 

3.9 mb GS 4.7 mb GS 

4.6 mb ISC 

2616 1973 11 26 2 4.5 

4.5 ML ADK 2641 1974 03 10 63.16 150.50 2 4.5 

2617 1973 11 27 51.26 175.96 4 3.9 4.5 mb GS 

3.9 mb GS 4.4 mb ISC 

Table 3-Magnitudes 185 
Eg.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

2644 1974 03 29 57.59 153.92 5 5.7 2668 1974 06 11 51.92 173.53 2 4.8 

5.7 mb GS 4.8 mb GS 

5.2 Ms GS 4.8 mb ISC 

5.8 mb ISC 2670 1974 06 22 51.25 178.24 2 4.5 

5.5 ML PMR 4.5 mb GS 

2645 1974 03 31 51.71 177.29 4 4.4 4.3 mb ISC 

4.4 mb GS 2673 1974 07 13 61.49 145.01 4 4.7 

4.5 mb ISC 4.7 mb GS 

2646 1974 04 06 55.10 160.44 5 5.7 4.4 mb ISC 

5.7 mb GS 2674 1974 07 13 62.23 151.22 5 4.4 

5.1 Ms GS 4.4 mb GS 

5.8 mb ISC 4.1 mb ISC 

2647 1974 04 06 55.34 160.60 2 4.3 2675 1974 07 29 59.71 152.73 5 4.5 

4.3 mb GS 4.5 mb GS 

4.3 mb ISC 4.5 mb ISC 

2648 1974 04 06 55.12 160.44 5 6.0 

6.0 mb GS 2676 1974 07 31 60.53 150.05 4 4.3 

5.3 Ms GS 4.3 mb GS 

6.0 mb ISC 4.3 mb ISC 

2677 1974 08 06 60.25 153.32 4 5.0 

2652 1974 04 15 59.19 136.43 4 4.2 5.0 mb GS 

4.2 mb GS 4.7 mb ISC 

4.5 mb ISC 2678 1974 08 11 66.02 165.51 2 4.1 

4.0 MLPMR 4.1 mb GS 

2653 1974 04 18 59.16 139.97 2 3.9 4.0 mb ISC 

3.9 mb GS 2679 1974 08 13 51.53 178.11 5 5.8 

4.4 MLPMR 5.9 Ms BRK 

2654 1974 04 22 51.99 176.06 4 4.9 5.8 mb GS 

4.9 mb GS 5.7 mb ISC 

4.8 mb ISC 2680 1974 08 14 51.56 178.15 2 5.7 

2656 1974 04 26 51.76 176.75 2 4.7 5.2 Ms BRK 

4.7 mb GS 5.7 mb GS 

4.5 mb ISC 5.6 mb ISC 

2658 1974 05 08 63.67 150.73 4 4.6 

4.6 mb GS 2681 1974 08 16 51.50 177.83 4 5.7 

4.6 mb ISC 5.9 ML ADK 

4.7 MLPMR 5.5 Ms BRK 

5.7 mb GS 

2659 1974 05 11 61.66 150.59 2 3.8 5.8 Ms GS 

3.8 mb GS 5.6 mb ISC 

2661 1974 05 21 63.31 151.25 2 4.2 2682 1974 08 20 52.24 174.97E 3 5.6 

4.2 mb GS 5.1 Ms BRK 

4.0 mb ISC 5.6 mb GS 

4.6 MLPMR 5.7 mb ISC 

2664 1974 05 27 60.33 146.02 3 5.5 2684 1974 08 22 51.42 176.32 2 4.1 

5.5 mb GS 3.7 Me cue 

5.7 Ms GS 4.1 mb GS 

5.4 mb ISC 2685 1974 08 24 51.66 178.62 2 4.0 

5.4 MLPMR 4.0 mb GS 

2665 1974 05 28 60.61 149.78 2 3.4 4.0 mb ISC 

3.4 mb GS 

3.8 MLPMR 2688 1974 08 27 51.94 178.84 2 4.4 

4.4 mb GS 

2667 1974 06 06 52.02 175.40 2 4.1 

4.1 mb GS 2690 1974 09 10 59.90 151.71 5 3.7 

4.3 mb ISC 3.7 mb GS 

186 U.S. Geological Survey Bulletin 1840 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude IEq.No. Year MoDy Lat 0 N Lon °W Io Magnitude 

2691 1974 09 11 60.27 151.04 5 4.3 2720 1975 01 08 52.40 175.55 3 5.1 

4.3 mb GS 4.8 Me cue 

4.1 MLPMR 5.1 ffib GS 

2693 1974 09 27 61.58 149.95 3 3.7 5.0 mb ISC 

3.7 mb GS 2721 1975 01 10 51.59 178.46 2 4.9 

2694 1974 09 28 64.48 147.73 4 3.6 4.9 mb GS 

3.6 mb GS 4.8 mb ISC 

4.1 MLPMR 2722 1975 01 13 61.43 150.49 5 4.8 

2700 1974 11 07 52.61 174.01 4 4.5 4.8 mb GS 

4.5 mb GS 4.9 mb ISC 

4.5 mb ISC 2726 1975 01 24 51.81 175.31 4 4.6 

2703 1974 11 11 51.63 178.11 5 5.8 4.6 mb GS 

5.8 mb GS 4.7 mb ISC 

5.7 mb ISC 2728 1975 Ol 27 61.28 149.81 3 3.9 

3.9 mb GS 

2704 1974 11 14 58.80 154.62 4 5.5 3.8 mb ISC 

5.3 Ms BRK 

5.5 mb GS 2729 1975 01 27 52.49 176.19 2 4.9 

5.6 Ms GS 4.9 mb GS 

5.2 mb ISC 4.7 mb ISC 

5.4 MLPMR 2730 1975 01 28 61.35 149.97 3 3.7 

2705 1974 11 15 58.84 154.45 5 3.8 3.7 mb GS 

3.8 mb GS 2731 1975 01 31 52.92 168.47 2 4.2 

2707 1974 11 28 51.87 175.27 4 5.2 4.2 mb GS 

5.2 mb GS 4.3 mb ISC 

5.1 mb ISC 2733 1975 02 02 53.05 173.45E 2 5.9 

2710 1974 11 30 53.27 172.96 4 5.2 5.9 mb GS 

5.2 mb GS 5.5 Ms GS 

4.9 Ms GS 5.9 mb ISC 

5.1 mb ISC 2734 1975 02 02 53.11 173.50E 9 6.1 

2713 1974 12 22 51.44 178.52 2 4.6 6.6 mb BD 

5.1 ML ADK 7.1 Ms BD 

4.6 mb GS 6.1 mb GS 

4.6 mb ISC 7.6 Ms GS 

6.0 mb ISC 

2714 1974 12 25 51.70 174.64E 4 5.7 7.4 Ms KA1 

5.9 ML ADK 7.5 Ms PAS 

5.3 Ms BRK 

5.7 mb GS 2736 1975 02 02 51.81 175.40 2 4.1 

5.8 Ms GS 4.1 mb GS 

5.8 mb ISC 4.1 mb ISC 

2738 1975 02 02 52.94 173.56E 2 4.9 

2716 1974 12 29 61.60 150.51 5 5.6 4.9 mb GS 

5.6 mb GS 4.5 Ms GS 

5.6 mb ISC 4.9 mb ISC 

2740 1975 02 07 52.40 174.24E 5 4.4 

2717 1974 12 30 61.98 149.69 5 5.1 4.4 mb GS 

5.1 mb GS 4.4 mb ISC 

5.2 mb ISC 2741 1975 02 09 52.82 174.49E 5 5.4 

5.4 mb GS 

2718 1975 01 01 61.91 149.74 5 5.9 5.4 Ms GS 

5.9 mb GS 5.3 lllb ISC 

5.9 mb ISC 2742 1975 02 10 60.70 147.00 2 4.3 

4.3 mb GS 

2719 1975 01 01 61.41 150.06 3 3.8 4.3 mb ISC 

3.8 mb GS 4.7 MLPMR 

Table 3-Magnitudes 187 
!Eq.No. Year MoDy Lat 0 NLon °W lo Magnitude Eq.No. Year MoDy Lat 0 N Lon °W Io MaRnitude 

2743 1975 02 12 63.52 148.73 4 4.0 2779 1975 06 11 62.17 149.64 2 4.3 

4.0 mb GS 4.3 mb GS 

3.9 mb ISC 4.5 mb ISC 

4.5 MLPMR 2780 1975 07 08 51.55 178.29 s 5.0 

2744 1975 02 15 51.84 175.26 2 4.4 5.0 mb GS 

4.4 mb GS 4.8 mb ISC 

4.3 mb ISC 2782 1975 07 25 55.06 160.38 4 5.8 

2749 1975 02 23 51.27 179.27 2 5.0 5.8 mb GS 

5.0 mb GS 5.2 Ms GS 

4.9 mb ISC 5.6 mb ISC 

2751 1975 04 02 51.62 178.29 3 4.9 2783 1975 08 02 53.39 161.49 5 6.2 

4.9 mb GS 5.7 Ms BRK 

4.8 mb ISC 6.2 mb GS 

2754 1975 04 07 61.56 150.57 2 3.6 6.0 Ms GS 

3.6 mb GS 6.0 mb ISC 

3.0 MLPMR 2784. 1975 08 21 60.36 151.19 5 4.9 

4.9 mb GS 

2756 1975 04 11 54.10 163.25 4 5.5 4.7 mb ISC 

5.7 Ms BRK 

5.5 mb GS 2787 1975 09 29 51.55 177.87 3 4.2 

5.2 Ms GS 4.2 mb GS 

5.5 mb ISC 4.2 mb ISC 

2760 1975 04 14 57.95 156.94 4 4.3 2788 1975 09 30 51.71 179.45 2 4.6 

4.3 mb GS 4.6 mb GS 

4.1 mb ISC 4.5 mb ISC 

2765 1975 04 18 61.81 150.56 s 3.5 2791 1975 10 28 61.42 152.42 s 4.5 

3.5 mb GS 4.5 mb GS 

3.0 MLPMR 4.3 mb ISC 

2766 1975 04 18 52.93 173.34E s 4.6 2792 1975 10 30 51.36 179.35 2 5.0 

4.6 mb GS 5.0 mb GS 

4.5 mb ISC 5.0 Ms GS 

2773 1975 05 12 51.57 176.22 4. 4.3 5.0 mb ISC 

4.19 Me cue 2793 1975 11 06 51.87 176.23E 5 5.4 

4.3 mb GS 5.4 mb GS 

4.3 mb ISC 5.4 mb ISC 

2774. 1975 05 15 51.72 175.42 2 4.0 2795 1975 11 13 54.37 162.66 5 5.3 

3.1 Me cue 5.3 mb GS 

4.0 mb GS 5.3 mb ISC 

4.0 mb ISC 2796 1975 11 30 52.30 176.27 s 4.8 

2775 1975 05 16 54.09 163.09 5 5.4 4.8 mb GS 

5.4 mb GS 4.6 mb ISC 

5.1 Ms GS 2797 1975 12 01 61.47 149.14 4 3.7 

5.3 mb ISC 3.7 mb GS 

2776 1975 05 18 63.17 150.26 5 5.4 2799 1975 12 21 53.16 168.97 4. 4.3 

5.4 mb GS 4.3 mb GS 

5.3 mb ISC 4.3 mb ISC 

2777 1975 05 21 60.18 147.58 2 4.8 2804 1976 01 13 51.79 174.70 2 3.9 

4.8 mb GS 3.9 mb GS 

4.7 Ms GS 

4.9 mb ISC 2806 1976 01 15 62.26 150.46 4 3.3 

4.7 MLPMR 3.3 MLPMR 

2807 1976 01 17 61.44 148.38 2 2.6 

2778 1975 06 04 51.94 179.58 2 4.5 2.6 MLPMR 

4.5 mb GS 2809 1976 01 23 53.52 166.49 4. 3.7 

4.4 mb ISC 3.7 mb GS 

188 U.S. Geological Survey Bulletin 1840 
1

Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

2810 1976 02 05 59.99 149.35 5 5.2 2829 1976 05 09 59.86 153.07 4 4.7 

5.2 mb GS 4.7 mb GS 

3.9 Ms GS 3.9 MLPMR 

5.2 mb ISC 2830 1976 05 11 61.49 146.97 3 4.2 

4.8 MLPMR 4.2 mb GS 

2811 1976 02 18 51.57 178.68 4 4.9 2831 1976 05 26 57.97 153.30 3 4.5 

4.9 mb GS 4.5 mb GS 

4.3 Ms GS 2832 1976 06 01 64.70 147.80 2 2.9 

5.0 mb ISC 2.9 MLPMR 

2812 1976 02 19 52.50 179.52 2 4.9 2833 1976 06 10 51.52 176.54 2 4.5 

4.9 mb GS 3.6 Me cue 

4.9 mb ISC 4.5 mb GS 

2813 1976 02 22 51.73 176.87 4 5.0 4.7 mb ISC 

4.19 Me cue 

5.0 mb GS 2834 1976 06 14 51.47 176.85 3 4.1 

5.0 mb ISC 3.9 Me cue 

2814 1976 02 28 51.56 178.54 2 4.8 4.1 mb GS 

4.8 mb GS 2835 1976 06 24 61.97 150.90 3 4.8 

5.0 mb ISC 4.8 mb GS 

2836 1976 07 05 51.30 179.14 2 4.6 

2815 1976 03 08 51.34 178.04 3 4.7 4.6 mb GS 

4.7 mb GS 4.6 mb ISC 

4.1 Ms GS 2837 1976 07 05 51.33 179.16 2 5.2 

5.0 mb ISC 5.2 mb GS 

2816 1976 03 13 63.50 148.67 5 3.9 5.0 mb ISO 

3.9 mb GS 2838 1976 07 15 62.70 149.83 4 4.2 

4.2 MLPMR 4.2 mb GS 

2817 1976 03 13 63.51 148.70 3 3.3 4.3 mb ISC 

3.3 MLPMR 4.6 MLPMR 

2819 1976 03 25 57.01 153.71 3 5.0 

5.0 mb GS 2839 1976 07 22 51.49 177.86 2 4.9 

4.9 mb ISC 4.9 mb GS 

2820 1976 03 26 63.60 147.65 4 4.1 4.9 mb ISC 

4.1 mb GS 2840 1976 07 30 61.33 147.45 2 3.9 

4.1 mb ISC 3.9 mb GS 

4.2 MLPMR 4.0 ML PMR 

2841 1976 08 11 51.70 175.42 3 4.6 

2822 1976 04 14 62.15 150.26 4 3.1 4.3 Me cue 

3.1 MLPMR 4.6 mb GS 

2823 1976 04 17 64.90 148.31 5 4.0 2842 1976 08 16 51.50 178.38 2 5.1 

4.0 MLPMR 4.0 Me cue 

2824 1976 04 25 64.79 147.67 5 3.3 5.1 mb GS 

3.3 MLPMR 5.2 mb ISC 

2825 1976 04 27 64.81 147.49 4 3.8 2843 1976 08 16 51.49 178.05 2 4.8 

3.8 ML PMR 3.6 Me cue 

4.8 mb GS 

2826 1976 04 27 64.73 147.58 5 3.0 3.9 Ms GS 

3.0 MLPMR 4.8 mb ISC 

2827 1976 04 27 64.73 14 7.58 3 3.0 2844 1976 08 22 60.22 153.30 6 5.5 

3.0 ML PMR 5.5 mb GS 

5.5 mb ISC 

2828 1976 05 08 61.62 151.52 4 4.4 

4.4 mb GS 2846 1976 08 28 52.60 175.34 3 5.1 

4.5 mb ISC 5.1 mb GS 

4.4 MLPMR 5.0 mb ISC 

Table 3-Magnitudes 189 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W lo Magnitude 

2847 1976 09 05 51.40 178.77 2 4.4 2865 1977 02 19 53.57 170.03E 4 6.2 

4.4 mb GS 6.8 Ms BRK 

4.4 mb ISC 6.2 mb GS 

2849 1976 09 21 57.84 152.12 3 4.9 6.7 Ms GS 

4.9 mb GS 6.6 Ms PAS 

4.8 mb ISC 2867 1977 03 03 51.75 175.97 3 4.1 

4.6 MLPMR 3.6 Me cue 

2850 1976 09 22 51.72 175.95 4. 4.8 4.1 mb GS 

4.5 Me cue 2868 1977 03 18 3 3.6 

4.8 mb GS 3.6 MLPMR 

5.1 Ms GS 2869 1977 03 25 60.84 148.14 5 4.6 

4.8 mb ISC 4.6 mb GS 

2851 1976 09 27 60.46 145.17 3 4.0 4.8 mb ISC 

4.0 mb GS 2870 1977 03 26 52.30 168.26 4 5.7 

3.3 MLPMR 5.9 Ms BRK 

2852 1976 10 18 63.29 150.74 4 4.9 5.7 mb GS 

4.9 mb GS 6.0 Ms GS 

4.9 mb ISC 5.7 mb ISC 

2853 1976 10 24 62.65 149.14 3 4.9 2871 1977 03 30 52.55 172.52E 4 5.0 

4.9 mb GS 5.0 mb GS 

4.8 mb ISC 5.1 mb ISC 

2854 1976 11 11 61.31 149.79 2 3.2 2872 1977 04 12 60.80 149.22 3 4.4 

3.2 MLPMR 4.4 mb GS 

2855 1976 11 30 59.92 153.36 4 4.7 5.1 MLPMR 

4.7 mb GS 2873 1977 04 18 3 4.1 

4.6 mb ISC 4.1 ·ML PMR 

2856 1976 12 15 61.35 150.25 3 3.7 2874 1977 04 20 59.45 150.61 4 4.8 

3.7 mb GS 4.8 mb GS 

2857 1976 12 15 64.83 147.87 4. 3.0 4.1 MLPMR 

3.0 MLPMR 2876 1977 04 27 62.29 150.97 2 3.1 

3.1 MLPMR 

2858 1977 01 03 51.43 179.08 2 4.8 

3.5 Me cue 2877 1977 05 05 64.84 148.36 3 3.7 

4.8 mb GS 3.7 MLPMR 

4.9 mb ISC 2878 1977 05 11 61.70 150.47 4 3.9 

3.9 mb GS 

2859 1977 01 06 51.48 175.48 4. 5.2 2881 1977 05 30 52.43 169.71 4 5.6 

5.2 Ms BRK 6.0 Ms BRK 

4.5 Me cue 5.6 mb GS 

5.2 mb GS 6.0 Ms GS 

5.3 Ms GS 5.5 mb ISC 

5.3 mb ISC 6.0 Ms PAS 

2883 1977 06 02 61.31 150.33 6 3.6 

2860 1977 01 13 59.43 142.23 3 4.5 3.6 mb GS 

4.5 MLPMR 2884 1977 06 06 62.16 149.55 3 4.1 

4.1 mb GS 

2861 1977 01 18 61.39 146.56 3 3.2 

3.2 MLPMR 2885 1977 06 12 61.63 146.15 3 4.2 

4.2 mb GS 

2862 1977 01 25 60.98 149.99 3 3.5 4.2 MLPMR 

3.5 MLPMR 2886 1977 06 17 58.27 151.82 3 4.0 

4.0 MLPMR 

2864 1977 01 30 51.57 175.53 2 4.1 2887 1977 06 17 61.49 150.32 5 4.3 

3.6 Me cue 4.3 mb GS 

4.1 mb GS 4.2 mb ISC 

190 U.S. Geological Survey Bulletin 1840 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 N Lon °W Io Magnitude 

2888 1977 06 29 51.77 176.22 4 5.0 2904 1977 09 04 51.10 178.27E 2 5.5 

4.1 Me cue 5.5 mb GS 

5.0 mb GS 6.4 Ms GS 

4.9 mb ISC 5.6 mb ISC 

2889 1977 07 08 61.17 150.85 5 4.7 6.4 Ms PAL 

4.7 mb GS 6.2 Ms PAS 

4.6 mb ISC 2905 1977 09 04 51.14 177.95E 2 5.8 

2890 1977 07 08 62.33 150.10 3 3.7 5.8 mb GS 

3.7 MLPMR 6.6 Ms GS 

2891 1977 07 11 64.56 147.27 5 4.5 5.8 mb ISO 

4.5 mb GS 6.7 Ms PAL 

4.2 Ms GS 6.4 Ms PAS 

4.4 mb ISC 2906 1977 09 09 62.19 149.53 2 4.6 

4.6 MLPMR 4.6 mb GS 

2892 1977 07 .20 54.61 161.60 5 5.3 4.7 mb ISC 

5.3 mb GS 2907 1977 09 17 60.86 150.84 4 3.7 

5.2 mb ISC 3.7 MLPMR 

2908 1977 09 17 61.03 152.92 4 4.8 

2893 1977 07 22 61.03 150.40 3 3.8 4.8 mb GS 

3.8 mb GS 4.7 mb ISC 

4.0 ML PMR 

2896 1977 08 15 51.59 176.38 4 4.5 2909 1977 09 17 64.82 147.43 4 4.0 

3.8 Me cue 4.0 MLPMR 

4.5 mb GS 2910 1977 10 03 65.15 146.84 3 3.3 

4.6 mb ISC 3.3 MLPMR 

2897 1977 08 16 67.52 150.25 4 3.5 2911 1977 10 16 59.88 152.55 5 4.6 

3.5 MLPMR 4.6 mb GS 

2898 1977 08 17 51.87 175.34 4 5.4 4.6 mb ISC 

4.5 Me cue 2912 1977 10 18 60.70 150.79 2 3.7 

5.4 mb GS 3.7 mb as 

5.4 mb ISC 3.4 MLPMR 

2899 1977 08 18 51.83 175.18 2 4.2 2913 1977 10 19 62.88 150.56 3 5.0 

4.2 mb GS 5.0 mb GS 

4.3 mb ISC 5.1 mb ISC 

2900 1977 08 29 51.56 173.97 2 5.4 2915 1977 10 28 60.91 149.72 2 3.4 

5.2 Ms BRK 3.4 MLPMR 

5.4 mb GS 2917 1977 11 04 51.66 175.95 6 5.7 

5.1 Ms GS 6.9 Ms BRK 

5.4 mb ISC 5.7 mb GS 

2901 1977 08 30 63.16 151.11 5 5.0 6.7 Ms GS 

5.0 mb GS 5.6 mb ISC 

5.0 mb ISC 6.6 Ms PAS 

2918 1977 11 04 51.43 175.56 4 5.4 

2902 1977 08 30 51.38 173.79 2 5.4 5.4 Ms BRK 

5.4 mb GS 5.4 mb GS 

5.0 Ms GS 5.4 Ms GS 

5.4 mb ISC 5.4 mb ISC 

2919 1977 11 06 62.10 144.94 2 3.3 

2903 1977 09 04 51.21 178.39E 2 5.6 3.3 MLPMR 

6.3 Ms BRK 

5.6 mb GS 2920 1977 11 17 64.97 147.91 4 3.9 

6.4 Ms GS 3.9 MLPMR 

5.6 mb ISC 

6.4 Ms PAL 2921 1977 11 17 64.61 149.54 2 3.3 

6.1 Ms PAS 3.3 MLPMR 

Table 3-Magnitudes 191 
Eq.No . Year MoDy Lat 0 NLon °W Io Magnitude [Eq.No. Year MoDy Lat 0 NLon °W lo Magnitude 

2923 1977 11 20 62.43 150.66 4 4.9 2942 1978 03 06 51.76 175.81 2 4.7 

4.9 mb GS 3.8 Me cue 

4.8 mb ISC 4.7 mt> GS 

4.9 MLPMR 4.7 mb ISe 

2924 1977 11 27 58.56 155.38 4 4.9 2943 1978 03 20 60.18 153.61 2 4.9 

4.9 mb GS 4.9 mb GS 

5.0 mb ISC 4.8 mb ISC 

2925 1977 12 08 59.45 151.36 4 4.7 2944 1978 03 20 59.84 153.24 3 3.8 

4.7 mb GS 3.8 mb GS 

4.7 mb ISC 2945 1978 03 31 61.77 151.41 4 5.1 

2926 1977 12 15 61.37 150.01 3 3.0 5.1 mb GS 

3.0 ML PMR 5.1 mb ISe 

2927 1977 12 16 59.77 153.45 2 4.9 4.0 Ms ISC 

4.9 mb GS 2946 1978 04 09 60.69 151.84 3 4.5 

4.8 mb ISC 4.5 mb GS 

4.2 Me GSM 

2928 1977 12 27 60.39 153.70 5 5.1 4.6 mb ISC 

5.1 mb GS 

5.1 mb ISC 2947 1978 04 12 56.42 152.69 5 6.0 

2929 1977 12 29 61.65 146.38 3 4.3 6.5 Ms BRK 

4.3 mb GS 5.8 ML GIA 

2930 1978 01 05 61.33 151.65 3 4.4 6.0 mb GS 

4.4 mb GS 6.6 Ms GS 

2931 1978 01 06 51.78 176.01 4 5.3 5.9 mb ISe 

5.3 mb GS 6.7 Ms ISC 

5.3 mb ISC 6.3 Ms PAS 

5.2 Ms ISC 2948 1978 04 19 60.14 153.54 2 4.6 

2932 1978 01 06 60.91 149.38 5 4.6 4.6 mb GS 

4.6 mb GS 5.2 Me GSM 

4.7 mb ISC 4.3 mb ISC 

4.9 MLPMR 

2949 1978 04 19 61.00 146.49 4 3.3 

2933 1978 01 09 62.00 148.82 3 3.5 3.2 Me GSM 

3.5 MLPMR 3.3 MLPMR 

2934 1978 01 09 51.61 177.17 2 3.9 

4.3 Me cue 2950 1978 04 21 64.53 147.95 2 3.7 

3.9 mb GS 4.2 Me GSM 

2935 1978 01 10 64.74 147.44 3 2.8 3;7 ML PMR 

2.8 MLPMR 

2951 1978 04 24 51.64 176.09 3 5.2 

2938 1978 01 27 60.37 151.12 3 4.7 5.2 mb GS 

4.7 mb GS 4.8 Ms GS 

4.8 mb ISC 5.2 mb ISC · 

4.8 Ms ISC 

2939 1978 01 28 60.07 151.33 3 4.5 

4.5 mb GS 2952 1978 05 05 63.30 150.97 4 5.2 

4.4 mb ISC 5.2 mb GS 

5.5 Me GSM 

2940 ·1978 02 12 59.45 152.62 4 5.4 5.1 mb ISC 

5.4 mb GS 

5.3 mb ISC 2953 1978 05 11 51.67 176.10 4 5.6 

4.2 Ms ISC 5.8 Ms BRK 

4.8 MLPMR 5.6 mb GS 

5.9 Ms GS 

2941 1978 02 16 61.31 144.89 4 4.1 5.6 mb ISC 

4.1 MLPMR 5.9 Ms ISC 

192 U.S. Geological Survey Bulletin 1840 
!Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude IEQ.No. Year MoDy Lat 0 N Lon °W Io Magnitude 

2954 1978 05 12 62.25 149.40 4 5.1 2966 1978 07 23 63.31 147.26 3 5.0 

5.1 mb GS 5.0 fib GS 

4.6 Me GSM 5.0 fib ISC 

5.1 mb ISC 4.8 MLPMR 

4.4 Ms ISC 2967 1978 07 27 65.00 147.60 4 3.8 

2955 1978 05 24 51.23 179.21 4 6.0 3.8 ML GIA 

6.4 Ms BRK 2968 1978 07 27 64.85 147.59 3 3.6 

6.0 mb GS 3.6 ML GIA 

6.7 Ms GS 2969 1978 07 27 64.93 148.02 3 3.7 

5.9 mb ISC 3.7 ML GIA 

6.7 Ms ISC 2971 1978 08 08 61.39 146.91 5 4.3 

6.4 mb PAS 4.3 fib GS 

6.2 Ms PAS 4.3 fib ISC 

2956 1978 05 24 51.13 179.20 3 5.2 

5.2 mb GS 2972 1978 08 13 62.28 149.71 4. 4.1 

5.4 Ms GS 4.1 fib GS 

5.2 fib ISC 4.6 fib ISC 

5.4 Ms ISC 2973 1978 08 18 59.89 153.53 6 5.4 

2957 1978 05 25 64.55 152.59 4 4.0 5.7 Ms BRK 

4.0 MLPMR 5.4 fib GS 

2958 1978 05 31 61.36 149.70 2 3.0 5.4 fib ISC 

3.2 Me GSM 5.1 Ms ISC 

3.0 MLPMR 2974. 1978 08 22 65.16 151.99 2 4.0 

4.0 MLPMR 

2959 1978 06 10 57.92 156.72 2 4.5 2975 1978 08 22 65.23 152.12 2 3.8 

4.5 fib GS 3.8 MLPMR 

3.9 Ms GS 2976 1978 08 22 64.92 152.53 2 3.8 

4.8 Me GSM 3.8 ML GIA 

4.5 fib ISC 

3.9 Ms ISC 2977 1978 08 22 64.99 152.31 2 3.4 

4.6 MLPMR 3.4 ML GIA 

2960 1978 06 10 60.30 146.45 4 4.8 2978 1978 08 26 65.08 152.36 2 3.3 

4.8 fib GS 3.3 ML GIA 

4.2 Me GSM 2979 1978 09 03 64.58 147.16 2 3.9 

4.9 fib ISC 3.9 ML GIA 

4.5 Ms ISC 2981 1978 09 19 61.34 147.18 3 3.9 

4.7 MLPMR 3.9 ML PMR 

2961 1978 06 12 59.86 150.76 3 4.0 2982 1978 09 20 61.92 149.23 4 3.8 

4.0 fib GS 3.8 MLPMR 

3.8 Me GSM 

4.0 fib ISC 2983 1978 09 21 61.11 151.81 4 4.5 

4.5 fib GS 

2962 1978 06 22 51.61 179.41 8 4.8 4.5 fib ISC 

4.8 fib GS 

5.9 Ms GS 2984. 1978 09 25 51.79 175.28 2 4.6 

4.9 mb ISC 4.6 fib GS 

4.9 Ms ISC 4.6 fib ISC 

2963 1978 07 13 61.11 149.95 2 3.5 2985 1978 09 26 64.99 147.55 3 3.7 

3.5 MLPMR 3.7 fib GS 

3.9 MLPMR 

2964 1978 07 16 63.57 150.52 3 3.5 

3.5 MLPMR 2986 1978 09 28 63.99 147.71 3 4.4 

4.4 fib GS 

2965 1978 07 19 61.33 149.98 2 3.0 4.4 fib ISC 

3.0 MLPMR 4.5 MLPMR 

Table 3-Magnitudes 193 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude iEq.No. Year MoDy Lat 0 NLon °W Ia Magnitude 

2987 1978 10 04 51.81 177.05 4 4.5 3004 1978 12 22 55.57 160.37 4 4.5 

4.1 Me cue 4.5 IDb GS 

4.5 mb GS 4.4 mb ISC 

4.7 mb ISC 4.2 MLPMR 

2988 1978 10 04 50.93 173.53E 3 5.3 3005 1978 12 24 63.56 157.59 4 5.0 

5.3 mb GS 5.0 IDb GS 

5.0 Ms GS 4.4 Ms GS 

5.3 mb ISC 5.0 mb ISC 

5.0 Ms ISC 4.7 Ms ISC 

2989 1978 10 06 61.93 150.67 3 4.6 5.3 ML PMR 

4.6 MLPMR 3006 1979 01 04 61.73 150.04 3 3.4 

2990 1978 10 17 51.72 176.94 6 5.0 3.4 ML PMR 

3.3 Me cue 3007 1979 01 08 61.77 150.08 2 2.5 

5.0 mb GS 2.5 ML PMR 

4.9 mb ISC 3008 1979 01 10 61.58 150.06 2 3.0 

4.0 Ms ISC 3.0 MLPMR 

2992 1978 10 30 60.96 150.32 3 3.3 

3.3 mb GS 3009 1979 01 25 63.32 151.16 3 3.5 

3.5 ML PMR 

2993 1978 10 31 61.91 149.57 2 3.5 3010 1979 01 25 60.13 153.12 4 5.5 

3.5 mb GS 5.5 mb GS 

3.4 MLPMR 5.4 IDb ISC 

2994 1978 11 14 64.54 147.03 2 3.7 4.7 Ms ISC 

3.7 MLPMR 3011 1979 01 27 60.96 149.38 4 3.6 

2995 1978 11 19 52.70 172.48E 5 5.3 3.6 fib GS 

5.3 IDb GS 3.2 MLPMR 

5.2 Ms GS 3012 1979 01 27 54.77 161.25 5 6.0 

5.3 mb ISC 5.8 Ms BRK 

5.3 Ms ISC 6.0 fib GS 

2996 1978 11 24 62.03 150.52 2 4.5 6.0 Ms GS 

4.5 mb GS 5.9 fib ISC 

4.7 mb ISC 6.0 Ms ISC 

2997 1978 11 24 61.99 150.51 2 3.2 5.8 Ms PAL 

3.2 mb GS 3013 1979 01 31 51.72 175.81 3 5.0 

4.0 Me cue 

2998 1978 12 02 59.69 151.66 5 3.7 5.0 mb GS 

3.7 MLPMR 5.1 mb ISC 

2999 1978 12 03 62.31 149.75 4 4.7 4.0 Ms ISC 

4.7 IDb GS 

4.7 mb ISC 3014 1979 02 01 60.24 152.84 4 4.8 

3.9 Ms ISC 4.8 fib GS 

3000 1978 12 04 65.04 147.51 2 3.3 4.8 IDb ISC 

3.3 MLPMR 3.6 Ms ISC 

3001 1978 12 08 68.33 145.17 2 4.0 3016 1979 02 07 61.03 150.15 3 3.0 

4.0 MLPMR 3.0 MLPMR 

3002 1978 12 15 52.11 175.23E 5 5.6 3017 1979 02 09 60.06 152.59 3 4.8 

5.4 Ms BRK 4.8 fib GS 

5.6 mb GS 4.8 fib ISC 

5.6 Ms GS 3018 1979 02 13 55.45 157.16 4 5.9 

5.6 mb ISC 6.6 Ms BRK 

5.6 Ms ISC 5.9 fib GS 

6.7 Ms GS 

3003 1978 12 17 63.95 147.42 4 4.8 5.7 fib ISC 

4.8 mb GS 6.8 Ms ISC 

4.8 mb ISC 6.8 mb PAS 

4.6 MLPMR 6.5 Ms PAS 

194 U.S. Geological Survey Bulletin 1840 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

3020 1979 02 17 62.31 149.50 3 4.9 3033 1979 03 27 60.49 148.98 3 2.9 

4.9 rnb GS 2.9 MLPMR 

4.9 rnb ISC 3034 1979 04 02 64.81 147.43 3 3.1 

4.4 Ms ISC 3.1 MLPMR 

3021 1979 02 23 64.98 147.85 5 4.3 3035 1979 04 04 60.32 153.59 3 4.5 

4.3 rnb GS 4.5 rnb GS 

4.3 rnb ISC 4.4 rnb ISC 

4.2 MLPMR 3036 1979 04 17 61.68 150.12 2 2.7 

3023 1979 02 27 62.29 149.81 3 2.7 2.7 MLPMR 

2.7 ML PMR 3038 1979 04 20 60.32 140.87 4 5.3 

3024 1979 02 28 52.94 169.06 3 4.5 5.0 Me EPB 

4.5 rnb GS 5.3 rnb EPB 

4.4 rnb ISC 5.3 rnb GS 

3025 1979 02 28 60.64 141.59 7 6.4 4.9 Ms GS 

7.3 Ms BRK 5.0 Me GSM 

6.9 ML EPB 5.3 rnb ISC 

7.1 Ms EPB 5.0 Ms ISC 

6.4 rnb GS 

7.1 Ms GS 3039 1979 04 25 63.35 149.50 3 3.9 

6.2 rnb ISC 3.9 rnb GS 

7.1 Ms ISC 4.3 rnb ISC 

7.0 Ms KA1 3040 1979 04 25 64.88 148.83 3 3.3 

7.1 rnb KA2 3.3 MLPMR 

7.4 Ms PAS 3041 1979 04 28 64.61 149.46 3 3.0 

6.9 MLPMR 3.0 MLPMR 

3042 1979 05 05 62.97 148.23 3 4.6 

3026 1979 03 01 60.63 141.24 3 5.4 4.6 rnb GS 

4.9 Me EPB 4.5 rnb ISC 

5.4 rnb EPB 3043 1979 05 09 61.93 148.92 3 2.9 

5.4 rnb GS 2.9 MLPMR 

4.7 Ms GS 

4.9 Me GSM 3046 1979 05 18 64.41 147.08 3 3.2 

5.3 rnb ISC 3.2 MLPMR 

4.7 Ms ISC 3047 1979 05 20 56.65 156.73 6 6.4 

5.3 MLPMR 6.2 rnb BRK 

3027' 1979 03 02 60.37 140.70 3 5.4 6.4 rnb GS 

5.0 Me EPB 6.4 rnb ISC 

5.4 rnb EPB 6.2 Ms ISC 

5.4 rnb GS 7.0 rnb KA2 

5.0 Me GSM 6.5 rnb PAS 

5.3 rnb ISC .., 6.1 Ms PAS 

4.7 Ms ISC 3049 1979 05 21 64.71 148.43 2 3.0 

5.2 MLPMR 3.0 MLPMR 

3028 1979 03 14 59.79 151.92 3 3.4 

3.4 rnb GS 3050 1979 05 25 52.61 167.02 4 6.0 

6.0 Ms BRK 

3029 1979 03 14 60.98 149.39 4 4.0 6.0 rnb GS 

4.0 rnb GS 6.2 Ms GS 

4.0 rnb ISC 6.0 rnb ISC 

6.3 Ms ISC 

3032 1979 03 27 51.82 175.33 4 5.0 

3.9 Me cue 3052 1979 05 31 61.74 149.88 3 3.4 

5.0 rnb GS 3.4 rnb GS 

4.4 Ms GS 

5.0 rnb ISC 3053 1979 06 20 60.88 147.69 3 3.3 

4.4 Ms ISC 3.3 ML PMR 

Table 3-Magnitudes 195 
Eq.No . Year MoDy Lat 0 NLon °W Io Magnitude 1Eq.No . Year MoDy La.t 0 N Lon °W Io Magnitude 

3054 1979 06 23 61.87 150.28 4 3.1 3069 1979 08 31 54.39 161.84 3 5.1 

3.1 mb GS 5.1 mb GS 

3.1 MLPMR 4.3 Ms GS 

3055 1979 06 23 58.03 134.01 4 3.8 5.0 mb ISC 

4.5 ML EPB 4.7 Ms ISC 

3.8 mb EPB 3070 1979 09 01 53.98 165.20 4 5.8 

3.8 mb GS 6.4 mb BRK 

3.9 mb ISC 5.8 mb GS 

3056 1979 06 26 62.36 147.83 4 3.8 5.8 mb ISC 

3.8 mb GS 4.8 Ms ISe 

4.4 mb ISC 6.3 fib PAS 

3057 1979 07 10 63.20 150.72 2 4.9 3072 1979 09 23 52.29 174.03E 4 5.8 

4.9 mb GS 5.6 Ms BRK 

4.9 mb ISC 5.8 fib GS 

3058 1979 07 11 55.32 134.97 4 5.1 5.6 Ms GS 

5.1 Ms BRK 5.8 fib ISe 

5.1 mb EPB 5.6 Ms ISe 

5.1 Ms EPB 3073 1979 09 24 52.19 174.02E 4 4.8 

5.1 mb GS 4.8 mb GS 

5.1 Ms GS 4.8 mb ISe 

5.1 mb ISC 4.0 Ms ISC 

5.1 Ms ISC 3074 1979 09 26 3 3.2 

5.8 MLPMR 3.2 Me cue 

3059 1979 07 16 60.86 153.02 3 4.6 3075 1979 09 27 3 3.1 

4.6 mb GS 3.1 Me cue 

4.5 mb ISC 3076 1979 10 07 61.22 150.43 3 3.1 

3060 1979 07 17 62.27 148.14 4 5.3 2.8 Me GSM 

5.0 mb BRK 3.1 MLPMR 

5.3 mb GS 3077 1979 10 10 56.15 135.75 3 4.4 

5.3 mb ISC 3.9 ML EPB 

4.5 Ms ISC 4.4 mb EPB 

3061 1979 07 23 58.63 151.51 2 4.4 4.4 mb GS 

4.4 mb GS 4.3 mb ISe 

4.5 mb ISC 3078 1979 10 15 51.77 175.24 4 4.8 

4.6 MLPMR 4.5 Me cue 

3062 1979 07 23 61.64 150.51 2 2.9 4.8 fib GS 

2.9 MLPMR 4.1 Ms GS 

3063 1979 07 30 62.04 145.44 2 3.5 4.7 fib ISC 

3.5 MLPMR 4.4 Ms ISe 

3079 1979 10 16 51.85 175.36E 2 5.3 

3064 1979 08 04 62.49 149.77 3 4.1 5.3 mb GS 

4.1 mb GS 5.2 Ms GS 

4.2 mb ISC 5.3 fib ISC 

3065 1979 08 07 51.32 176.11 3 4.6 5.0 Ms ISC 

3.8 Me cue 

4.6 mb GS 3080 1979 10 18 51.86 177.13E 3 6.0 

4.6 mb ISC 6.0 fib GS 

3066 1979 08 10 61.97 150.94 3 4.3 6.0 mb ISC 

4.3 mb GS 5.3 Ms ISe 

4.2 mb ISe 3081 1979 10 27 61.70 149.58 2 3.0 

3067 1979 08 27 3 4.0 3.2 Me GSM 

4.0 MLPMR 3.0 MLPMR 

3082 1979 10 27 59.38 152.90 3 4.1 

3068 1979 08 29 61.91 150.80 3 3.9 4.1 mb GS 

3.9 mb GS 3.8 Me GSM 

196 U.S. Geological Survey Bulletin 1840 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude IEQ.No. Year MoDy Lat 0 NLon °W Io Magnitude 

3083 1979 10 28 59.86 151.67 3 3.6 3099 1980 03 17 59.99 153.14 3 4.9 

3.6 Me GSM 4.9 mb GS 

3084 1979 11 02 51.16 178.05 3 4.8 4.2 Me GSM 

4.0 Me cue 4.7 mb ISC 

4.8 mb GS 3100 1980 03 24 52.97 167.67 5 6.2 

4.6 Ms GS 7.1 Ms BRK 

4.8 mb ISC 6.2 mb GS 

4.6 Ms ISC 6.9 Ms GS 

4.3 MLPMR 6.1 mb ISC 

3085 1979 11 07 60.59 150.68 3 3.5 6.8 Ms ISC 

3.5 Me GSM 6.9 ML PMR 

3086 1979 11 14 61.38 150.09 5 5.1 3101 1980 03 27 52.79 167.75 4 4.7 

5.1 mb GS 4.7 mb GS 

4.4 Me GSM 4.7 mb ISC 

5.1 mb ISC 3102 1980 03 28 53.00 167.62 3 4.9 

5.2 Ms ISC 4.9 mb GS 

3087 1979 11 15 61.26 150.00 4 3.8 4.1 Ms GS 

3.5 Me GSM 4.9 mb ISC 

3.8 MLPMR 4.1 Ms ISC 

3103 1980 04 03 63.15 149.57 4 5.0 

3088 1979 11 15 60.18 149.68 4 3.6 ; 5.0 mb GS 

3.6 Me GSM 5.3 Me GSM 

3089 1979 12 26 61.42 151.62 2 4.1 4.9 mb ISC 

4.1 mb GS 4.3 Ms ISC 

3.9 Me GSM 5.3 MLPMR 

3090 1980 01 04 61.66 147.44 3 3.7 

3.7 mb GS 3104 1980 04 03 61.60 150.56 4 3.6 

3.5 Me GSM 3.6 Me GSM 

3091 1980 01 19 51.32 178.49 3 5.8 3105 1980 04 06 61.38 147.82 5 4.9 

5.7 Ms BRK 4.9 mb GS 

4.5 Me cue 5.2 Ms GS 

5.8 mb GS 4.3 Me GSM 

5.7 Ms GS 4.9 mb ISC 

5.8 mb ISC 4.6 Ms ISC 

5.7 Ms ISC 5.2 MLPMR 

3092 1980 02 03 64.65 149.55 3 3.0 3106 1980 04 13 55.04 160.31 3 5.4 

3.8 Me GSM 5.4 mb GS 

3.0 MLPMR 5.4 mb ISC 

5.0 Ms ISC 

3093 1980 02 08 64.68 146.87 4 3.3 3107 1980 04 14 52.98 167.84 4 4.7 

3.3 MLPMR 4.7 mb GS 

3095 1980 03 02 59.62 151.36 4 4.4 4.1 Ms GS 

4.4 mb GS 4.8 mb ISC 

3.6 Me GSM 4.1 Ms ISO 

4.1 mb ISC 

4.3 ML PMR 3108 1980 04 15 51.87 175.96 3 5.1 

3096 1980 03 10 54.47 162.92 4 4.8 4.1 Me cue 

4.8 mb GS 5.1 mb GS 

4.8 mb ISC 5.0 mb ISO 

3097 1980 03 12 52.15 168.98 2 5.4 4.1 Ms ISC 

5.4 mb GS 

5.2 Ms GS 3109 1980 05 01 61.89 146.94 4 4.3 

5.4 mb ISC 4.3 mb GS 

5.3 Ms ISC 3.9 Me GSM 

3098 1980 03 13 64.97 147.57 3 3.1 4.4 mb ISO 

3.1 MLPMR 4.0 MLPMR 

Table 3-Magnitudes 197 
Eq.No. Year MoDy Lat 0 NLon °W Io 

3110 1980 05 07 62.99 150.80 2 

3111 1980 05 14 68.41 148.90 3 

3112 1980 05 29 64.91 147.43 3 

3113 1980 06 03 60.00 152.67 2 

3114 1980 06 09 61.51 150.71 4 

3115 1980 06 12 59.82 151.75 3 

3117 1980 06 28 62.92 151.10 3 

3118 1980 06 30 60.{)1- 141.05 4 

3119 1980 06 30 60.02 141.11 4 

3120 1980 07 04 61.90 151.06 4 

3121 1980 07 05 61.61 150.11 3 

198 U.S. Geological Survey Bulletin 1840 1 

Magnitude 

5.0 

5.0 IDb GS 

5.1 Me GSM 

5.0 mb ISC 

4.1 MLPMR 

4.4 

4.4 IDb GS 

4.3 IDb ISC 

4.4 ML PMR 

3.6 

3.6 MLPMR 

3.7 

3.7 IDb GS 

4.3 Me GSM 

3.8 MLPMR 

4.5 

4.5 IDb GS 

4.4 Me GSM 

4.4 mb ISC 

4.3 MLPMR 

3.3 

3.5 Me GSM 

3.3 MLPMR 

4.3 

4.3 IDb GS 

4.7 Me GSM 

4.2 IDb ISC 

3.8 MLPMR 

5.0 

5.0 IDb EPB 

5.0 IDb GS 

4.0 Me GSM 

5.0 IDb ISC 

5.1 MLPMR 

4.9 

4.9 IDb EPB 

4.8 Ms EPB 

4.9 mb GS 

4.8 Ms GS 

4.3 Me GSM 

4.9 IDb ISC 

5.2 Ms ISC 

5.2 MLPMR 

4.3 

4.3 IDb GS 

4.4 Me GSM 

4.2 IDb ISC 

3.8 MLPMR 

3.7 

3.5 Me GSM 

3.7 MLPMR 

IEcr.No. Year MoDy Lat 0 NLon °W Io Magnitude 

3122 1980 07 06 56.56 154.24 3 5.2 

4.8 Ms BRK 

5.2 mb GS 

4.9 Ms GS 

5.2 IDb ISC 

4.9 Ms ISC 

5.4 MLPMR 

3123 1980 07 24 51.75 176.56 3 4.1 

3.7 Me cue 

4.1 IDb GS 

4.3 IDb ISC 

3124 1980 07 27 63.72 152.79 4 4.7 

4.7 IDb GS 

3.7 Ms GS 

5.1 Me GSM 

4.7 fib ISC 

3.7 Ms ISC 

5.0 MLPMR 

3125 1980 08 01 59.62 148.94 4 5.4 

5.3 Ms BRK 

5.4 fib GS 

5.1 Ms GS 

4.8 Me GSM 

5.4 fib ISC 

5.0 Ms ISC 

5.7 MLPMR 

3126 1980 08 04 61.09 151.87 3 3.8 

3.8 fib GS 

4.1 Me GSM 

4.1 ML PMR 

3127 1980 08 07 63.52 151.29 4 5.2 

5.2 fib GS 

5.1 fib ISC 

4.3 Ms ISC 

5.4 MLPMR 

3128 1980 08 13 59.25 151.78 3 4.0 

4.0 fib GS 

3.8 Me GSM 

4.2 fib ISC 

4.0 ML PMR 

3129 1980 08 18 63.05 150.51 3 4.5 

4.5 fib GS 

4.4 Me GSM 

4.3 fib ISC 

4.0 MLPMR 

3130 1980 08 30 59.52 152.84 4 4.5 

4.5 fib GS 

4.6 Me GSM 

4.4 fib ISC 

4.7 MLPMR 

3131 1980 09 09 61.01 150.91 3 3.6 

3.6 fib GS 

3.5 Me GSM 

3.7 ML PMR 
Eq.No. Year MoDy Lat 0 NLon °W Io Magnitude 

3132 1980 09 13 59.84 152.25 3 4.3 

4.3 mb GS 

4.5 Me GSM 

4.4 MLPMR 

3133 1980 09 19 65.60 148.05 3 3.8 

3.8 MLPMR 

3134 1980 10 06 66.73 155.06 3 4.6 

4.6 mb GS 

4.5 Ms GS 

4.6 mb ISC 

3.8 Ms ISC 

4.7 MLPMR 

3135 1980 10 14 54.03 165.99 4 4.5 

4.5 mb GS 

4.5 mb ISC 

4.5 Ms ISC 

3136 1980 10 15 55.67 161.13 4 5.0 

5.0 mb GS 

4.9 mb ISC 

4.9 ML PMR 

3140 1980 11 21 51.80 176.14 5 5.6 

5.6 Ms BRK 

4.6 Me cue 

5.6 mb GS 

5.7 Ms GS 

5.7 mb ISC 

5.7 Ms ISC 

6.0 mb PAS 

5.5 Ms PAS 

3142 1980 11 27 59.19 136.43 3 4.1 

3.9 ML EPB 

4.1 mb EPB 

4.1 mb GS 

3.3 Me GSM 

4.2 MLPMR 

3143 1980 11 30 59.43 153.28 5 4.9 

4.9 mb GS 

4.19 Me GSM 

4.8 mb ISC 

3.6 Ms ISC 

3145 1981 08 01 60.14 153.18 5 5.2 

5.2 mb GS 

5.1 mb ISC 

Table 3-Magnitudes 199 

'1:r U.S. GOVERNMENT PRINTING OFFICE:1988-1573-047/86088 

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