Hawaiian Volcano Observatory

1972 Quarterly Administrative reports

Introductory Note By Thomas L. Wright and Jennifer S. Nakata

Compiled By Jennifer S. Nakata

Summary 65

January, February, and March 1972

By Marie S. Onouye, Arnold T. Okamura, and Robert Y. Koyanagi

Chronological Summary By Robert L. Christiansen

Summary 66

April, May, and June 1972

By Akira Yamamoto, John C. Forbes, and Maurice K. Sako

Chronological Summary By Robert L. Christiansen

Summary 67

July, August, and September 1972

By John D. Unger, Robert Y. Koyanagi, and Arnold T. Okamura

Summary of Eruptive Events By Donald W. Peterson

Summary 68

October, November, and December 1972

By Patricia Stevenson, Robert Y. Koyanagi, and Arnold T. Okamura 

Summary of Eruptive Events By Donald W. Peterson 

Open-File Report 2007-1332

U.S. Department of the Interior

U.S. Geological Survey
U.S. Department of the Interior

DIRK KEMPTHORNE, Secretary

U.S. Geological Survey

Mark D. Myers, Director

U.S. Geological Survey, Reston, Virginia 2007

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INTRODUCTORY NOTE

The Hawaiian Volcano Observatory Summaries have been published in the current format since 1956. The Quarterly 

Summaries (1956 through 1973) and the Annual Summaries (1974 through 1985) were originally published as Administrative Reports. These reports have been compiled and published as U.S. Geological Survey Open-File Reports. 

The quarterly reports have been combined and published as one annual summary. All the summaries from 1956 to 

the present are now available as .pdf files at http://www.usgs.gov/pubprod.

The earthquake summary data are presented as a listing of origin time, depth, magnitude, and other location parameters. Network instrumentation, field station sites, and location algorithms are described. Tilt and other deformation 

data are included until Summary 77, January to December 1977. From 1978, the seismic and deformation data are 

published separately, due to differing schedules of data reduction. 

There are eight quarters—from the fourth quarter of 1959 to the third quarter of 1961—that were never published. 

Two of these (4th quarter 1959, 1st quarter 1960) have now been published, using handwritten notes of Jerry Eaton 

(HVO seismologist at the time) and his colleagues. The seismic records for the remaining six summaries went back to 

California in 1961 with Jerry Eaton. Other responsibilities intervened, and the seismic summaries were never prepared.

Chronology

The following Kïlauea eruption chronology covers the two recent reports and the six missing quarters:

Location Beginning Date Ending Date Comment

Kïlauea Iki crater (Kïlauea’s summit) 11/14/1959 12/20/1959 19 eruptive episodes

Kapoho (lower east rift zone) 1/13/1960 2/18/1960 4 eruption stages

Halemaumau (Kïlauea’s summit) 2/24/1961 2/24/1961 Intermittent activity during 

uninterrupted inflation following the 1960 eruption

Halemaumau (Kïlauea’s summit) 3/22/1961 3/25/1961 Same as above.

Halemaumau (Kïlauea’s summit) 7/10/1961 7/17/1961 Same as above.

Heiheiahulu (middle east rift zone) 9/22/1961 9/25/1961 First historical east rift eruption at this location

The 1959-1960 eruptions were among two of the most spectacular Kïlauea eruptions. The HVO staff was kept busy 

with acquisition of unusually high quantities of instrumental data and observations of the two sequences, which 

were separated by less than one month. Even with a year’s interval before the beginning of the summit-east rift sequence in 1961, the staff never caught up, and the seismic records were set aside for later study. 

A total of 1,672 earthquakes—1,106 for 1960 and 566 for 1961—are part of HVO’s cataloged database. The annual 

listings have been appended to the 1st Quarter Report of 1960 and to the 4th Quarter Report for 1961. The number of 

earthquakes is probably low, biased toward the larger magnitudes. The entire HVO catalog, including 1960 and 1961, 

is accessible from the ANSS CATALOG SEARCH site at http://www.ncedc.org/anss/catalog-search.

 Thomas L. Wright and Jennifer S. Nakata 
..

UNITED STATES

DEPART~ffiNT OF THE INTERIOR

GEOLOGICAL SURVEY

HA~vAIIAN VOLCANO OBSERVATORY

SUMMARY 65

January, February, and March 1972

By

Marie S. Onouye, Arnold T. Okamura,

and Robert Y. Koyanagi

Chronological Summary

By

Robert L. Christiansen

OBSERVATORY STAFF

Geology

R. L. Christiansen

W. A. Duffield

R. T. Holcomb

D. W. Peterson (Scientist-in-Charge)

Geophysics

K. T. Honma

George Kojima

R. Y. Koyanagi

A. T. Okamura

J. D. Unger

Geochemistry

R. T. Okamura

Support

C. D. Arakaki

J. C. Forbes

w. H. Francis

M. S. Onouye (Mrs.)

H. K. Sako

Akira Yamamoto
CONTENTS

Page

•

•

Chronologieal Summary••

Sei8IDic Summary. • • • • •

Tilting of the ground around Kilauea Caldera

References

Illustrations

1

3

52

54

Figure 1. Epicenter Dlap • 48

2. System response curves for the Wood-Anderson

torsion seismograph and the four different types

of seismometer-amplifier combinations used by

the Hawaiian Volcano Observatory. • • • • • • • • 50

Tables

Table 1. Number of earthquakes and minutes of tremor •

2. Summary of seismic events • •

3. List of felt earthquakes.

4. U. S. Geological Survey seismograph stations

in Hawaii • • • • • • • • • • • • • • • • • •

4

8

47

49

5. Description of seismic instrumentation types. 51

• 6. Tilt coordinates at Uwekahuna • • • • • • • • • 52

7. u. S. Geological Survey water-tube tiltmeter

stations in Hawaii. • • • • • • • • • • • • • 53
•

•

•

CHRONOLOGICAL SUMMARY

The long inflation that followed a summit and southwest-rift

eruption in late September 1971 continued through January 1972.

High levels of shallow caldera seismic activity accompanied the

inflation, and on January 21 a brief but intense earthquake swarm

occurred near the intersection of the east rift zone with the

caldera rim, near Keanakakoi. Harmonic tremor and a brief deflation with this swarm suggest that it marked the reopening of the

east rift zone, which had been inactive since mid-October and

which probably had not been connected to the summit magma reservoir

system since June 1971.

Eruptive activity resumed on the east rift zone on February 4

or 5 with the quiet reentry of lava into the summit- crater of Mauna

U1u. From this slow beginning, the new Mauna Ulu eruption increased

in vigor for several days, filling the summit crater to the level

of the sill between it and the eastern trench by the morning of

February 7. Low fountaining became apparent at a vent within the

eastern part of the suuanit crater, and it became progressively

higher as the eruption continued. The lava that cascaded into the

eastern trench rose to a sufficient height to force open the old

lava tube between the trench and Alae Crater, then flowed through

the tube to partly fill the shallow subsidence bowl that earlier

had formed in the lava fill above the buried crater.

A talus dam partly blocked flowage through the eastern trench

of Mauna Ulu, causing the lava to cascade over the obstruction and

then build a rampart across it by spattering and episodic overflow.

This dam continued to build higher, ultimately exceeding the elevation of the sill between the trench and the summit crater. The

entire fissure trough of Mauna Ulu thus became a single lava lake

as eruption continued and the eastern levees grew higher. Circulation and cycles of rising and falling lava-lake. levels took on

patterns much like those of the active lava-lake periods of the

1969-1971 Mauna Ulu eruption•

A second vent opened within the area of the former trench on

February 8 and slowly became the principal source of lava; at the

first vent fountaining eventually became inconspicuous as it became

higher and more voluminous at the second. The lava level in the

main summit crater began to drop, and by February 17 the flow

pattern had reversed, lava cascading westward from the trench

across the sill into the summit crater. A day later harmonic

tremor declined, the summit pool crusted over, and the lava fountain

in the trench became progressively lower through February 21, when

all surface activity ceased.
Activity resumed on February 24 with a second phase of moderate

fountaining from the first-active vent in Mauna Ulu's summit crater

(vent A), followed shortly by simultaneous fountaining at the vent

in the trench (vent B). Within a day the lava lake filled the entire

Mauna Ulu fissure trough and overflowed at several points. A major

flow developed that extended around the north side of Kane Nui 0 Ramo

and into Napau Crater before it stopped. Once again,· vent B gradually

became dominant over vent A, fountaining reaching 60 m or more, and

a spatter cone bui~t around vent B to a height of 25 m. Once again,

as in the first phase, vent A ceased to erupt actively, and by March 5

the lava level in the former summit crater had dropped more than 30 m

so that lava again cascaded westward across the sill between the trench

and the crater. Vent B declined shortly later, and by March 9 the lava

level in the trench too was below the sill level. By March 10 vent B

was only weakly active. A resurgence of activity occurred at both

vents in mid-March and began a series of alternating major overflows

and drainbacks of the lava lake. New flows covered all of the Mauna

Ulu shield except at its westernmost end.

On March 18 a series of shallow local earthquakes occurred, a

substantial deflation ensued at the Kilauea summit, and the lava lake

drained abruptly by several tens of meters. A new fissure formed on

the west flank of the shield and erupted briefly; two new vents broke

out in the area of Alae. One vent (vent C) was within the remnant

Alae subsidence bowl and rapidly filied it. Overflow and marginal

spatter bagan to build levees around the margins of this pond, which

soon became an actively circulating lava lake. The vent outside the

new Alae lava lake (vent D) fed a flow that cascaded into Makaopuhi

Crater. The new vents peaked on about March 20 and died on March 23

or 24. Activity continued in Mauna Ulu, but the lava lake did not

rise substantially, as lava apparently continued to drain underground

both to Alae and to the we~t. At times lava could be seen through a

hole on the west side of Mauna Ulu to be flowing westward toward the

fissure that had erupted briefly on March 18.

When the activity at Alae declined and ceased, the continuing

moderate deflation at Kilauea's summit reversed; a'slight inflation

began even though moderate fountaining and lava-lake activity

continued at Mauna Ulu.

2

•
•

•

SEIS~{IC SUMMARY

Events recorded by the U. S. Geological Survey seismograph

network in Hawaii fall into two categories:

1) Local earthquakes and tremor originating in the region of

the Hawaiian Islands (usually within 100 km of at least

one seismograph),

2) Distant earthquakes originating more than 3 t OOO k.m from Hawaii.

As an index of seismic activity at Hawaiian volcanoes, daily counts of

earthquakes and minutes of tremor recorded by seismographs in Hawaii

are listed in Table 1. The earthquakes are separated in groups on the

basis of region of origin 8S d·etermined by the analysis of records

obtained daily at the Observatory (OWE, MLO, MLX, ABU, DES, NPT, WPT,

MPH, ICMO, OTL).

Computer locations of well·-recorded events are listed in Table 2.

The location of each seismograph station is listed in Table 4, along

with a description of the equipment at each station•

3
Table l.--Number of earthquakes and minutes of tremor recorded on seismographs around 

Tremor is separated into three categories: Deep, Intermediate, and Shallow, on the b

relative amplitude on seismographs in the summit region. Unless otherwise state

is presumed to be associated with movement of magma within the central complex o

Volcano.

Earthquake categories are: Kilauea Summit 30 km, earthquakes from a source about 30 

the summit region; Kilauea Summit Long-Period, earthquakes characterized by low

waves that originate roughly 5 km beneath the summit region; Kilauea Summit Shal

quakes a few km deep in the caldera region; SW Rift and'Kaoiki, earthquakes alon

southwest rift zone of Kilauea and the adjacent portions of the Kaoiki fault sys

Upper East Rift, earthquakes from the upper east rift zone and the adjacent fau

of Kilauea's south flank; Koae, earthquakes along the northeast-trending Koae fa

south of the caldera; Lower East Rift, earthquakes from the lower east rift zone 

Offshore Puu Pili, offshore earthquakes mostly southeast of Puu Pili (PPL) stati

• • • I.
• " . •

J1

Tremor Earthquakes

Date (m = minutes

(1972) h = hours) Kilauea Sutmnit

SW Rift Upper Lower

Inter- Long and East East Offshore

Deep rmediate Shallow 30 KM Period Shallow Kaoiki Rift Koae Rift Puu Pili 

Jan. 1 45m ? ? ? ? ? ? ? 

2 1 77 1618 -38 198 133 6 29 

3 2 67 1495 68 267 97 6 62 

4 367 1354 44 324 85 6 53

5 8m 1 76 1408 31 180 40 9 29

6 .I-J ? 1249 ? ? ? ? 1

7 -r-I • 56 1728 23 103 42 7 150

8 ,...d.I-J 2 124 2094 . 26 178 53 4 41

9 .I-JCD =0 69 2735 25 161 82 4 19

10 t'CS S Q) 2 51, 223! ' 10 165 214 311 

eu

$-I ..c:' 

11 5m Q).I-J 482 2967., ' 24 330 286 . 12 72 

12 =' ::s 171 3814 38 3,85 365 11 165 

13 4lm 0 eu.d 1 79 3'069 41 441 267 22 137

14 10m .coc .I-J :s 69 2569 53 575 188 12 11515 0 = 76 2112 44 493 138 15 159

...

16 o.t::.u 1 60 2139 45 437 128 12 85

17 "'" 54 2296 64 398 157 31 112 o =

18 s 0 QJer-f 5 32 2330, 34 200 244 6 148

19 17m 8m ,.. be .... Q) 36 2215 24 367 194 31 25

20 1 64 3490 24 626 74 5 9321 t'CS .u Q)er-f 4 69 2428 25 205 209 5 110

22 ) 2 29 2798 41 191 155 8 10123 ? (J =' er-f rJ) 42 93 2426 72 299 212 7 172

24 ? 5? 69? 699? 35? 1421 173? 2? 45

25 100m 13m ,.. r=: o Cd 4 51 1610 36 192 188 4 6726 5m c:l. tJ) 11 26 2295 61 170 329 2 69

27 39m 8 106 2329 16 1190? 15 10 24 

28 1 64 3044 21 395 497 22 120 

29 5 78 2677 36 421 217 17 131

30 3 34 2235 42 214 142 4 59

31 u 4 37 1369 34 213 12 3 71
0\

Tremor Earthquakes

(m = minutes

Date h = hours) Kilauea Summit

(1972) SW Rift Upper Lower

Inter- Long and East East Offsh

Deep mediate Shallow 30 KM Period Shallow Kaoiki Rift Koae Rift PUll P

Feb. 1 ? 4 65 1630 37 157 59 6 41

2 44m 43? 1820? 31? 233? 157? 8 79

3 18 118 1876 26 610? 164 10 76

4 4? 16? 926? 19? ? 49? ? ? 

. 

5

Q.J

.t:: 3 14 1391 20 123 50 3 31 

6 25m .c: r:: 3? 699? 20? 36 19? 98

.u 0 7 =s 1 2? 1695? 13? 56? 43? 39 8 o Q.J 3 5 1096 28 19 57 15 208 .s:: 9 ... .u 9 820 24 28 16 135

10 0e..- 3 2 977 7 18 35 7 89

11 Q.J :s ... 0 11 881? 8? 6 24 28 38

12 .u.t::be 2 2 669? 15 9 24 5 5613 24m P""I =' 3 741? 12 3 11 4 56

Q.J 0

14 > J-4 cv.t:: 2 508 15 25 12 40 .-4..- 15 :t ..- 1 6 819 28 22 3 97 16 7 740 17 22 4 125 r-fer-4 17 ... 14 1085 106 46 9 2 79

18 0"-(I) 19 850 16 49 23 1 76 19 ..... t'CS 9 973 8 66 39 71

20 Q) 1 27 941 15 77 42 1 146 Q) ... 21 = Q) ? 12? 261? 5? 22? 121 31 22

22 5? 61 473? 9? 25? II? 21 44

23 ::s 17 1315 8 44 32 97

24 8m ? 688 9 20 45 4 55

25 1 483 10 4 20 75

26 2 8 451 10 2 23 6 52

27 2 262? 15? 5 25 15 37

28 1 1 369 8 6 15 4 63

29 2 15 444? 8? 19 11? 13 25

• • • ..
• " •

•

--oJ

Tremor Earthquakes

(m

= minutes

Date

h

= hours) Kilauea Summit

(1972) SW Rift Upper Lower

Inter- Long and East East Offs

Deep mediate Shallow 30 KM Period Shallow Kaoiki Rift Koae Rift Puu 

Mar. 1 1 60 471 14 14?

5

2 2

2 64 502 16 13?' 14 9

3 157 483 17 291 11 71 2

4 401 234? 51 51 14? 1 2

5 4m 1 88 395 19 10? 22 1 3

6 ? . 27 536 13 53 13 7

7 .c 62 610 32- 39 7 2 9

8 .,c:: 35 607 19 25 19

4 9

9 QJ 0 .c S 1 35 732 8 27 11

4 8

10 34m "" QI

4 15 707 28 29 33

4 5

11 c::.c

3

8 634 25 10 19 7

o .,

12' .... .,

3

3 672 32 14 19

3 6

13 . §] 19 140 10 27 11 1 4

14 .... co

2 10 644 25 28 14 1 10

15 .u :s

0 13 698 27 29 25 1 6

QJ ... 16 .,.c

4 38 682 18 25 12 7

17 4001 Cd4.J ... 44 812 7 ' 51 16

4 1

Q) 4.J 18 1 3 6611

9 697? 23 1

19 0""

S ... 1 3601 8 27 2? 3

20

o ., 15001 2011 29 33 11 3

co

tU 

:t Q) 21 0 20001 3941 34 30? 6? 3

... 22 cu 1441 2921 23 128 8? 5 2

23 c.. 1051 419 13 27 10 1 2

:s 24 33m 146 657 "52 36 27

2 5

25 38 754 15 70 26

2 8

26 10 12 329 21 45

6 1 4

27 114? 6301 47 74 21

4 2

28 1 172 533 38 26 21

4 2

29 1 119 537 37 29 18

5 14

30 128 553 37 30 17 17 3

31

2 114 586 33 81 13 11 9
Table 2 is a chronological listing of successfully located earthquakes. For each event the following data are presented:

Origin time in Hawaii Standard Time: date, hour (HR) t minute (MN),

and second (SEC).

Epicenter in degrees and minutes of North latitude (LAT N) and

West longitude (LONG W). Poor convergence of the epicenter solution

is indicated by"?".

Depth - depth of focus in km. Assumed depth is indicated by "x".

Mag - magnitude, if determined.

NO - number of stations used in locating earthquakes.

GAP - largest azimuthal separation in degrees between stations.

DMIN - epicentral distance in km to the nearest station.

ERT - standard error of the origin time in seconds.

ERR - standard error of the epicenter in km.

ERZ - standard error of the depth in km.

MD - mean deviation of the time residuals. [ = R/NO ] where

Et is the observed seismic wave arrival time less the

computed time at the i th station.

Q - solution quality of the hypocenter. This measure is

intended to indicate the general reliability of each

solution:

EPICENTER FOCAL DEPTH

A excellent good

B good fair

C fair poor

D poor poor

Q is based both on the nature of the station distribution with respect

to the earthquake and the statistical measures of the solution. These

two factors are each rated independently according to the following

scheme:

8

..
•

A

B

c

D

Station Distribution

NO GAP DMIN

> 8 < 120· < DEPTH or 5 1cm

> 6 < lSO· < 2 x DEPTH or 10 km

> 6 < 225· < SO Ian

> 4 < 180·

Others

Q is taken as the average of the ratings from ~he two schemes, that is,

an A and a C yield -a B, and two B's yield a B. When the two ratings

are only one level apart the lower one is used, that is, an A and a B

yield a B (Hamilton and others. 1969).

The criteria for Q are the saae as used by the Office of Earthquake

Research and Crustal Studies, u. S. Geological Survey.

*RHAX is the max~ residual

9
SUMMARY OF SEISMIC EVENTS

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERT ERH 

JAN 1 o 48 0.6 lQ-19.0 155-13.61_ 0.0 1.'6 '18 1 qS 6.6 1.76 1 • 3 1

1 o 54 41.4 19-19.5155-15,.3, 6.5 2.0 21 163 3.8 0.10 0.8 

1 1 32 55.0 18-49.2 155-19.3 1.7* 2.0 20 264 40.4 0.48 3.0 

1 5 11 56.2 19-18.6 155-15.0· b.3 1.5 18 204 5.0 0.14 0.9 

1 6 1 21.8 19-18. 5 " 1 «; 5-15 3 9.0 1.2 15 205 4.8 0.11 0.8 

1 8 18 29.6 19-23.3.155-14.1 2.2* 1.2 9 l06 2.6 0.04 0.3 

1 8 19 6.3 19-23.8 ,,155-15.91 3.6 1.2 7 119 2.0 0.28 1.5' 

1 13 16 3.4 lQ-11.Q" 3.2 2.2 10 164- 4.4 0.24 1.8 

1 15 55 46.6 19-17.1"155- 6t .91 0.0 2.5' 10 288 18.5 0.63 3.2 

1 18 46 8.6 19-21.5 155-28.2' .. 2.1 2.8 13 60 0.14 1.0 

2 1 59 7.3 19-13.2 - 5.6 2.9 21 91 1.'-3 0.14 1.0 

t-& 2 10 13 8.4 19-23.2 155-14.6 3.0 0.8 10 104 2,.1 0.06 0.2 

0 2 10 18 49.3 1 9-1 9 • 8. 155-15. 6 7.1 1.6 17 1.40 3.3 0.05 . ·0.5 

...,.1

2 11 8 56.7 19-19.8 155-',c. 7.5 8.0* 1.5 13171." 5.9 0.12 1.1· 

2 11 55 27.9 19-24.1 155-16.4 3.3 0.6 11 64 " 1.'1 0.08 0.,3 

2 12 31 40.3 . 19-20.1' 1'55-' 8.9 " 8.8 1.5 15 165 0.08 0.7 

2 13 4 24.1 1 9 - 24. 1 ." 1 5 5-.16'. 0 1 • 8 O. 7 7 101 2.0 0.06 0.4 

2 14 20 3.8. 14.8* 1.9 13 259 36.2 0.3'5 2.4 

2 15 46 33.6 19-23. 8 i55-'15.,! 4 : 3.2 0.9 12 19 2.5 0.13 0.6 

2 16 12 39.6' 19-14.3 . 1.7 1.1 13 112. 9.0 2.,.31 1.0 

2 17 25 22.5 19-16.8 1,55-21.8 3.8' 1.8 '18 1 38, ,'" 6. 0 0.11 . O.q" 

2 18 1 23.2 19-18.8' 155-' 8,;.. 5 8.0* 0.'6 11 l87 6.5 O.lQ; 1.5 

2 18 34 30.6 19-23. 8 6 8.0* 1.0 19 149 1.1 0.11 0.8 

2 19 55 11.3 19-19.9·155-16.i 6.3 0.8 17 131 2.4 0.07 0.6 

2 20 1 39.7 19-19.8 l55-l0.1 9.0 0.6 13 166 4.3 0.01 0.6 

2 2130 24.3 19-18.3 1'55-14.3 8.0* 2.2 20 153 6.3 0.01 0.6 

2 21 33 42.8 19-18.7 155-14.5 8.0* 1.0 15 181 5.7 0.10 0.7 

2 21 35 36.3 19-24.3 155-25.9 8.0* 1.0 15 155 8.8 0.06 0.5 

2 22 26 36.1 lq-24.6 155-16.3 0.2 0.1 7 91 1.3 0.07 0.2 

2 23 11 56.q 19-23.7 155-14.8 3.8 0.8 13 90 1.9 0.'07 0.3 

ft • •
• .1 • •

SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W OEPTH MAG NO GAP OHIN ERT ERH 

JAN 3 2 38 27.9 19-23.2 155-14.1 2.1* 0.4 9 109 2.6 0.04 0.3 

3 2 50 42.q 20- 2.5 155-38.91 33.0* 1.6 14 211 36.1 0.21 1.9 

3 2 55 41.5 19-18.2 155-23.4 1.2 1.1 16 113 3.7 0.06 0.7 

3 3 35 26.9 19-48.8 155-39.8 14.8* 1.6 12 108 21.7 0.18 1.9 

3 3 59 18.8 19-18. 7 15·5-11. 5 29.8 1.8 22 142 2.5 0.12 0.1 

3 ,. 51 52.8 19-24.0 155-15.1 1.9 0.6 8- 125 2.5 0.04 0.·2 

3 5 -1 3.4 19-20.3 1'55- 6.9 8.0* 1.1 15 162' 6.1 0.12 1.0 

3 5 27 5.6 19-19.4 155-15.4 6.3 0.8 14 181 3.7 0.,12 0.8 

3 1 14 19.1 19-20.9 155-19.2 4.0 0.1 10 90 3.5 0.09 0.3 

3 7 16 40.2 19-21.9 155-18.1 5.1 0.8 13 71 3.5 0.01 0.4 

,3 1 51 32.8 18-55.6 155-24.6 10.5 1.9 12 243 26.3 0.40 2.1 

3 9 43 3.1 19- 9.2 155-15.6 9.3 1. ,. 18 224 17.1 0.14 0.9 

3 10 50 2.6 19-20.3 155-19.0 6.2 1.1 16 73 2.8 0.04 0.3 

3 12 lq 19.1 18-43.3 155-16.2 8.0* 2.5 20 280 50.1 0.64 4.0 

3 12 46 14.8 18-41.4 155-11.3 8.0* 2.3 20 269 44.9 0.61 3.9 

3 14 31 20.7 19-11.2 155- 4.6 36.7 1.9 15 239 16.3 0.,1'5 0.9 3 11 51 55.5 19-15.9 155-21.4 4.1 2.8 23 141 8.6 0.12 0.8 

3 19 40 45.6 19-23.5 155- 3.0 0.1 1.9 13 120 6.6 6.02 1.0 

3 21 ,. 27.8 19-11.1 155-14.1 6.0 2.4 16 205 8.0 0.24 1.3 

3 21 35 19-11.q 155-14.3 5.8 1.6 16 216 6.1 0.18 1.1 

3 21 36 16.0 19-18.8 155-14.6 4.6 1.2 15 204 5.5 0.11 1.0 

3 21 45 59.4 19-18.4 155-14.3 6.3 1.0 18 211 6.2 0.15 1.0 

3 21 47 30.3 19-23.2 155-25.9 1.9 1.6 18 11 1.2 0.10 0.6 

3 21 49 2.0 19-11.9 155-14.1 b.2 1.6 18 218 1.0 0'.19 1.1 

3 21 59 11.6 19-26.6 155-13.5 32.2 1.9 13 235 3.9 0.41 2.2 

3 22 22 36.9 18-48.3 155-20.5 2.1* 2.6 24 268 39.3 0.52 3.3 

3 '22 39 33.7 19-16.4 155-22.7 0.4 1.7 18 135 1.0 5.32 0.8 

3 22 40 35.6 19-15.9 l55-22.C? 0.0 1.8 18 159 8.2 5.34 0.7 

3 23 12 28.0 19-16.0 155-22.0 2.3 1.1 18 159 8.1 0.11 0.8 

3 23 40 18.2 19-17.0 155-22.9 5.8 1.8 15 146 6.0 0.11 1.0 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1912 HR MN SEC LAT N LONG w OEPTH MAG NO GAP OMIN ERT ERH E

JAN ,3 23 56 34.0 19-23.2 155-14.3 3.9 0.9 13 102 2.1 0.03 0.2 0

4 1 50 29.3 19-23.5 155-25.4 2.1 1.6 17 68 1.2 0.11 0.8 

4 1 59 51.1 19-15.5 155-14.3 0.6*' 1.2 10 265 13.1 0.86 3.6 

4 2 18 47.7 1 9 -1 9 .- 4 1 55-i 1 • "7 4.8 1.6 19 112 5.9 0.13 0.8 0

4 5 37 26.3 19-19.2 '155-46.7 6.2 1.9 15 243 18.5 0.59 2.6 2

4 5 43 34.,0 18-46.0 155-13.3 8 .. 0* 2.8 14 273 50.4 0.15 4.8 

4 7 o 33. 7 lQ-20.5 155-11.0 8.3 2.7 18 156 3.5 0.07 0.6 0

4 1 8 35.6 19-23.5 155-14.6 2.3* 0.1 9 101 2.3 0.08 0.6' 

4 11 36 35.1 19-10.9 155-21'.1 35.5 2.7 22 146 2.9 0.23 1.1 2

4 12 8 55.4 19-23.0 155-14.7 3.0 1.4 15 112 2.4 0.06 0.4 0

4 17 50 57.6 19-23.8 155-25.01 0.0 1.3 15 106 1.2 9.15 0.9 1

r-a 4 20 40 0.9 18-50.9 155-20.3 8.8 2.6 20 263 36.9 0.57 3.4 2

N 4 21 51 8.6 19-20.4 155-12.1 4.3 0.1 13 195 3.8 0.21 1.2 

5 o 31 9.5 18-52.3 155- 8.9 18.6* 2.2 15 312 50.4 0.41 3.0 

5 1 13 6.0 18-54.8 155-18.6 11.4* 2.2 20 '250 31.6 0.36 2.4 

5 1 36 11.8 19-17.6 155- 0.1 8.0* 1.9 12 242 6.'5 0.30 2.l 

5 2 .6 '°31.,7 . 19- 9,.2 '155-15.1 2.1 2.0 20 225 0.29 1."3 5 3 1 2.9 19-15.8 154-59.,1 5.4 1.8 13 '253 9.5 0.79 3.7 

5 3 8 8.·0 19-25.8 7.5 1.3' 11 11 10.2 0.'08 0._7 0

5 5 35 3.8 19-16.4 155-22.7 3.8 1.7 15 185 1.'0 0.16 1.1 

5 9 . 2' 24.,2 19-,19.4 155-13.5 5.5 1. 1 11 161 5.'9 0.14 0.9 0

5 10 33 38.1 1 q-10.,,'1 155-20.5 43.4 - 1.5 15 208 12.9 2.1 4

5 11 25 27.6 18-46.3 155-15.7 8.0* 2.6 12 290 '41.9 0.52 3.4 

5 22 55 23.8 1q-22.6 2.4 1.4 14 148- 4.6 0.13 0.8 

5 '22 57 51. 8 19-22.7 155-24.3 5.9 1.8 21 52 5.0 0.07 0.1 0

'6 0 q 44.8 19-18.5 155-13.6 6.4 1.6 19' 198 1.3 0.16 1.0 0

6 o 12 43.4 19-18.9 155-13.9 6.2 1.2 15 208 6.6 0.18 1.1 0

6 2 41 25.0 18-52.8 155- 9.9 7.8 1.8 23 259 44.1 0.40 2.6 3

6 6 38 '>2.1 19-18.5 155-13.61 6.1 17 199 7.3 0.11 1.0 0

611 '3225.0 19-19.6 155-15.2 6.0 0.7 14 119 4.0 0.10 0.6 0

• • .. •
• • ,.

SUMMARY OF SEISMIC EVENTS (CONTINUED)

lq12 HR MN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH 

JAN 6 L6 44 15.3 lQ-16.0 155-22.2 0.6* 1.1 16 141 7.3 0.12 1.0 

6 23 9 3.6 18-49.8 155-11.q 1.2* 3.0 21 263 40.4 0.43 2.8 

7 1 49 18.3 19-24.2 155-25.4 4.0 1.9 21 12 8.3 0.10 0.8 7 2 16 22.4 18-46.5 155-11.4 8.0* 2.3 19 272 45.1 0.56 3.6 

8 2 20 30.9 19-23.1 155-24.1 8.0* 1.2 11 199 6.6 0.11 0.7 

8 8 10 46.3 1'9-19.7 155-15.6 6.4 0.7 14 114 3.3 0.11 

8 8 30 24.1 19- 9.9 155-36.1 3.2 1.6 14 105 9.4 0.13 1.0 

8 9 52 8.3 19-20.1 155- q.2 8.4 2.1 11 140 2.8 0.07 0.7 

8 13 49 26.9 18-44.8 155-11.9 8.0* 2.6 16 276 46.1 0.53 3.4 8 14 l3 26.2 ·19-23.1 155-26.0 7.8 1.2 19 130 8.1 0.09 0.7 

8 15 21 16.2 19-25.1 155-14.1 30.8 2.8 28 58 0.8 0.11 0.6 

I-' 8 16 32 3.4 18-49.5 155-16.3 1.9* 2.1 14 264 42.1 0.42 2.8 

w 8 16 .34 39.0 lq-25.2 155-13.1 29.4 1.5 25 83 1.4 0.11 0.7 

8 20 15 4.2 19-22.2 155-23.0 5.1 1.0 14 143 3.7 0.12 0.9 

8 23 32 31.5 lq-19.4 155-13.9 8.0* 1.0 11 196 6.0 0.10 0.8 

9 1 17 45.3 19-19.6 155- 9.8 8.1 0.9 14 172 4.6 0.08 0.7 

9 3 23 1.1 19-21.3 155- 1.91 11.2 1.6 13 161 3.1 0.14 1.1 

9 4 10 44.8 19-19.q 155- 9.1 1.7 0.7 12 168 4.2 0.11 1.0 

9 1 39 28.2 19-19.6 155-10.5 8.8 1.0 13 110 4.7 0.08 0.6 

9 8 o 24.9 18-1)3.8 155-10.6 12.3* 3.4 28 255 41.9 0.34 2.2 

9 8 5 18-53.5 155- 9.8 8.0* 2.1 22 251 43.4 0.32 2.1 

9 15 32 3.9 19-25.1 155-16.4 2.0 0.6 9 114 1.1 0.05 0.4 

9 15 38 22.2 19-24.7 155-16.·J 1.6 0.8 8 99 1.2 0.04 0.3 

9 16 19 59.3 19-19.9 155- 7.4 8.0* 1.4 12 110 5.9 0.14 1.4 

9 16 23 0.9 19-24.3 155-17.3 1.2 0.3 1 91 1.3 0.06 0.3 

J

9 17 30 6.0 19-24.1 155-15.9 1.8 0.5 8 63 2.3 0.05 0.3 

9 19 o 43.1 19-25.1 155-16.9 1.3 2.6 19 120 0.4 0.07 0.4 

9 20 11 15.1 18-56.0 155-21.0 8.1 2.2 12 295 27.6 1.28 6.5 

q 23 18 40.5 19-25.0 155-16.4 1.1 0.4 9 110 1.0 0.06 0.3 

10 0 2 46.2 19-26.2 155-15.61 0.3 0.8 9 205 1.3 0.63 0.8 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH 

JAN 10 2 11 3.1 19-24.5 155-16.3 0.8 0.5 12 84 1.4 0.05 0.2 

10 2 22 24.4 19-24.2 155-15.9 1.6 0.7 10 71 2.4 0.01 0.4 

10 3 9 11.0 19-24.0 155-15.6 4.0 2.0 13 81 2.6 0.08 0.4 

10 3 28 27.4 19-25.6 155-16.6 2.1 0.4 10 126 1.5 0.06 0.4 

10 5 38 14.1 19-18.6 155-16.11 8.4 0.9 10 195 3.5 0.20 1.6 

10 6 21 49.2 lq-18.8 155-1q.l 29.1 1.3 20 71 1.1 0.14 0.9 

10 6 32 48.7 19-24.6 155-15.51 2.1 0.3 11 14 1.6 0.15 0.8 

10 7 36 16.1 19-13.0 155- 2.51 38.6 1.6 18 244 12.8 0.29 1.1 

10 8 50 20.4 lq-24.5 155-16.9 0.6 0.2 8 73 0.8 0.10 0.2 

10 9 56 1.7 19-25.2 155-11.0 1.9 0.6 10 121 0.6 0.08 0.5 

10 10 13 5.0 19-25.6 155-14.4 31.1 1.3 21 95 1.8 0.10 0.6 

10 14 47 38.7 18-44.9 155-16.9 8.0* 3.8 26 276 41.9 0.55 3.5 

10 14 50 15.8 19-19.4 155- 8.1 8.0* 1.8 15 116 5.4 0.10 0.7 

10 15 41 4g.9 19-15.6 1'55-11.4 53.6 2.5 23 159 4.9 0.45 1.8 

10 19 53 14.'-} 19-20.1 155- 8.9 1.6 16 165 4.0 0.10 0.9 

10 21 5 58.8 19-25.7 155-16.6 2.1 0.8 7 206 1.6 0.22 0.9 

10 21 27 37.3 lq-23.4 155-14.6 3.4 0.8 9 108 2.4 0.21 0.6 

10 21 44 32.3 lq-23.3 155-14.5 2.9 0.9 9 109 2.6 0.17 0.6 

11 0 '1 42.q 19-23.3 155-14.8 1.6 1.1 10 104 2.6 0.09 0.5 

11 '34826.7 18-51.1 10.8* 1.,8' 15 '263 37.0 0.44 2.9 

11 4 34 45.1 19-23.8 155-15.4 1.7 0.8 9 148 2.5 0.07 0.4 

11 4 36 25.8 18-48.9 155-17.4 8.0* 2.9 19 211 42.2 0.41 3.1 

11 6 9 15.4 19-23.6 155-14.6 3.8 '0.3 13 92 2.0 0.06 0.3 

11 8 7 39.2 19-23.0 2.5 0.6 10 11'1' 2.3 ' 0.08 0.3 

11 8 29 43.0 18-51.4 155-16.'41 3.6 2.6 19 299 39.0 1.86 10.9' 

11 10 28 4 19-25.6 155-16.6 2.1 0.6 11 151 1.'4 ' 0.05 0.4 

11 10 31 29.7 19-22.0 155-18.4 2.0* 1.0 12 16 3.7 0.04 0.3 

11 12 43 6.0 lq-25.6 155-16.5 2.4 0.9 12 126 1.5 0.04 0.3 

11 13 41 44.9 lq-25.6 155-16.5 2.1 0.9 10 126 1.5 0.05 0.3 

11 14 53 28.8 '19-22.6 155- 3.51 0.0 1.4 20 111 5.0 5.21 1.1 1

,. ¥ ..
, ,

SUMMARY OF SEISMIC EVENTS (CONTINUED)

1912 HR MN SEC lAT N LONG W DEPTH MAG NO GAP OMIN ERT ERH 

JAN 11 16 53 4.5 19-23.8 155-14.8 3.9 1.2 13 88 1.8 0.06 0.3 

11 17 58 24.2 19-23.6 155-14.6 3.6 0.6 13 91 2.0 0.09 0.4 

11 18 1 39.6 19-23.0 1·55-14.2 4.2 1.1 15 109 2.9 0.09 0.6 

11 19 12 44.6 19-11.9 155-16.41 9.2 1.3 11 211 3.9 0.21 1.6 

11 23 21 45.1 19-22.0 155-17.9 4.3 1. 1 11 15 3.1 0.12 0.5 

12 o 10 29.0 19-23.6 155-15.1 2.1 1.0 10 94 2.3 0.09 0.4 

12 o 11 25.1 19-23.5 155-26.2 5.5 1.0 16 104 1.9 0.14 1.1 

12 3 29 14.5 19-19.2 155-13.8 8.0 2.2 23 145 6.3 0.08 0.6 

12 3 55 33.0 19-?3.6 155-15.2 4.0 1.2 14 91 2.5 0.09 0.4 

12 4 59 54.4 19-22.9 155-22.6 8.0* 1.6 11 143 5.2 0.12 1.0 

12 6 3 50.8 19-13.6 155-21.31 0.0 1.8 20 160 9.4 5.88 1.2 

12 6 25 55.1 19-22.5 15S-i4.9 6.9 1.0 11 123 1 •. 1 0.53 1.2 

V1 12 6 41 51.2 19-20.1 155- 7.31 0.8 1.1 19 203 5.7 1.40 1.1t 

12 1 22 56.1 lq-23.3 155-14.6 3.5 1.0 11 101 2.6 0.08 0.4 

12 8 1 4.0 19-24.0 155-15 .. 6 3.0 0.9 l3 10 2.5 0.09 0.4 

12 13 35 0.1 19-19.4 155-13.1 6.1 1.6 21 168 5.8 0.11 0.7 

12 11 32 8.6 19-14.4 155-21.91 0.0 1.6 21 155 8.1 5.60 1.1 

12 18 59 42.5 19-23.6 155-14.1 3.3 10 97 2.2 0.13 0.5 

12 20 34 16.9 18-48.1 155-11.9 8.0* 2.6 23 267 43.2 0.37 2.4 

12 21 25 13.6 19-18.0 155-13.8 2.6 2.4 25 154 1.5 0.13 0.7 

12 21 ]1 15.0 19-19.2 155-12.4 3.2 1.9 24 150 6.0 0.14 0.9 

12 22 9 1.3 ·19-19.9 155-11.3 4.9 1.5 22 164 4.7 0.13 0.9 

12 23 54 24.2 lq-22.9 155-14.4 4.3 0.8 15 116 2.8 0.06 0.4 

13 1 22 10.3 19-23.2 155-14.9 3.5 0.0 11 104 2.3 0.06 0.2 

13 1 25 26.1 19-23.1 155-15.1 2.6 2.0 24 108 1.8 0.01 0.5 

13 2 1 57.4 19-22.3 155-17.9 3.3 1.3 16 75 2.6 0.03 0.3 

13 4 4 16. 1 19-21.8 155-24.9 3 1.3 19 61 4.0 0.07 0.6 

13 5 8 56.8 19-25.4 155-16.7 3.0 1.0 14 123 1.1 0.06 0.4 

13 6 44 5.4 18-48.4 155-11.4 8.0* 3.1 25 267 43.0 0.45 3.0 

13 6 41 18.2 18-52.0 155-19.5 8.0* 2.0 20 260 35.4 0.25 1.6 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1912 HR HN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH 

JAN 13 8 3 58.4 19-23.4 155-1?O? 0.4 0.8 10 99 2.4 0.21 0.5 

13 8 6 26.9 19-19.1 155-13.3 5.3 1.6 21 150 6.3 0.11 0.8 

13 8 25 19.2 19-20.4 155-12.2 8.3 2.1 18 141 3.9 0.07 0.6 

13 13 22 37.4 19-22.8 155-22.8 8.0* 1.5 17 116 4.9 0.10 0.8 

13 13 51 42.9 19-18.8 155-13.11 0.6 0.7 16 194 6.8 3.51 1.4 

13 13 59 32.2 18-47.8 155-17.4 8.0* 4.3 27,268 44.0 0.34 2.2 

13 16 23 2.3 19-25.3 155-24.9 8.0* 1.2 16 64 8.4 0.04 0.3 

13 18 16 9.0 19-19.7 155-10.9 4.9 1.4 17 169 4.8 0.1.6 1.1 

13 18 44 19.3 19-21.9 155- 7.01 0.1 1.5 19 132 5.1 0.13 1.3 

13 20 1 51.3 18-46.8 155-17.3 3.0 26 211 45.6 0.44 2.9 

14 o 29 l6.2 18-41.9 155-20.6 1.3* 2.7 26 269 39.6 0.45 2.9 

r-a 14 o 40 6.0 19-53.3 155-31.7 30.7 2.1 16 134 13.9 0.11 1.0 

0'\ 14 3 24 24.q 19-31.0 155-54.4 9.5 2.6 23 110 1.6 0.12 1.2 

14 3 31 42.4 19-19.5 155-12.2 2.6 1.2 21 169 5.6 0.14 0.8 

14 4 41 44.6 18-51.6 155-19.6 8.6 2.6 23 257 36.1 0.43 2.6 

14 1 3 9.0 18-52.9 155-11.0 8.2 2.4 13 281 36.1 0.79 4.4 

14 11 55 33.6 19-20.2 155- 1.21 2.2 2.1 19 163 5.8 0.26 0.8 

14 12 16 29.7 19-23.8 155-14.8 3.2 1.1 12 89 1.9 0.01 0.4 14 12 23 39.2 18-46.9 155-16.8 8.0* 3.0 16 271' 46.1 0.56 

14 14 35 40.7· 19-:22.4 155--:23.1 8.0 2.1 20 93 4.0 0.06 0.6 

14 14 48 26.1 19-11.1 155-22.8 3.6 16 131 5.9 0.08 0.8 

14 16 26 49.9 1q-22.1 155-23.4 1.7 1.8 15 153 3.6 0.09 0.7. 14 16 33 10.0 19-23.3 1155-14.7 4.8 1. 1 13 102 2.7 0.10 0.4 

14 22 28 3.1 19-24.'9 8.2 21 60 6.8 0.07 0.6 

14 22 29 7.4 19- 9.8 155-41.3 3.2 2.7 21 128 11.9 0.12 0.8 

15 3 45 12.6 19-18.8 155-15.5 6.0 1.5 22 168 4.1 0.11 0.8 

15 4 30 24.q lq-23.4 155- 3.0 2.1 2.2 25 120 6.4 0.48 0.8 

15 4 56 35.7 19-23.3 155-15.2 0.6, 0.1 13 103 2.0 0.81 0.3 

15 5 35 1.5 18-52.6 155-16.61 0.0 2.4 23 255 36.9 0.41 2.2 

15 1 31 1.4 19-22.6 155-24.4 8.1 1.3 21 52 4.7 0.01 0.6 

• " • •
• • • •

SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH ER

JAN 15 12 2 12.3 19-21.0 155- 6.3 8.0· 1.7 14 147 6.2 0.11 1.1 

15 13 52 59.2 19-23.6 155-14.9 2.5 0.1 12 95 2.2 0.09 0.5 2.15 13 56 51.9 19-13.2 155-32.9 31.1 22 77 8.1 0.22 1.1 2.

15 14 13 55.1 19-13.5 155-33.1 30.7 2.3 27 75 7.4 0.20 1.0 2.

15 ·14 57 28.4 155-33.8 34.1 1.5 14 103 6.2 0.22 1.0 2.

15 16 52 6.3 19-15.2 155- 0.4 34.2 1.1 24 221 9.8 0.24 1.4 1.

16 Z 55 ·59.8 19-15.4 155-22.91 0.0 1.3 18 141 8.8 4.43 0.8 8.16 3 4S 56.0 19-18.1 155-21.31 1.9 1.2 15 108 4.5 0.07 0.4 0.

16 4 1 18.9 19-18.9 155- 8.4 2.9 2.0 23 163 6.3 0.16 0.9 1.

16 4 11 29.6 18-48.3 155-15.51 0.2 2.7 22 268 44.7 0.36 2.8 1.

16 It 22 30.9 20- 1.0 155-18.2 8.6 1.9 19 232 14.6 0.49 2.7 2.

t-& 16 15 1 59.4 19-19.6 155-11.9 5.5 2.0 22 148 5.4 0.11 0.8 0.

........ 16 18 25 59.4 19-16.1 155-22.8 3.1 1.9 23 137 6.9 -0.09 0.7 0.

16 18 54 51.4 19·15.2 155-23.7? 0.0 1.0 14 207 9.2 -7.22 1.6 13.

16 21 10 53.5 19-19.7 155-15.2 5.7 1.7 22 140 4.0 0.07 0.5 0.

16 21 17 14.0 19-19.4 155-15.1 6.8 1.6 22 143 4.1 0.01 0.5 0.

16 23 20 27.1 18-52.0 155-16.5 3.9 2.4 21 256 38.0 0.30 1.1 2.

17 1 38 51.2 18-47.8 155-17.5 1.0 2.5 24 268 43.9 0.32 2.7 1.

17 2 53 6.8 19·15.6 155-22.11 0.0 2.1 22 155 7.2 3.91 0.1 7.

17 2 55 23.1 19-15.8 155-23.21 2.8 1.5 17 160 6.3 2.34 0.9 4.

17 3 o 37.9 19-20.5 155-13.8 5.6 1.4 16 174 4.2 0.11 0.8 -0

17 4 13 33.3 19-24.1 155-14.61 2.0 1.0 14 73 0.4 0.18 0.5 0.

17 8 4 13.1 19-18.2 155-23.6 2.8 2.9 22 112 3.7 0.08 0.6 0.

17 11 23 19.3 18-.48.1 155-18.0 8. O. -2.·6 23 -267 43.1 0.36 2.4 

17 11 5S 26.8 19-18.3 155-24.1 2.5 1.2 14 108 3.8 0.06 0.6 1.

17 17 6 11.0 19-20.5 155-13.7 5.7 0.1 21 149 4.1 0.09 0.7 0,

17 19 23 4.6 19-19.7 4.2 2.6 20 113 12.6 0.19 1.1 2.17 19 56 35.9 18-47.4 155-17.4 8.0* 2.4 23 269 44.1 0.49 3.2 18 o 24 52.0 19-21.5 155-14.9 6.6 0.8 22 127 2.4 0.08 0.1 0.

18 3 7 15.5 19-22.9 155-14.3 1.2 0.7 14 112 2.9 0.07 0.3 0.
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH ERZ 

18 12 8 0.3 19-19.1 155-15.4 6 •• 0.1 15 205 3.9 0.21 1.3 0.7 

18 12 32 25.1 19-18.4 155-12.31 0.0 0.9 18 180 7.5 5.48 1.0 10.3 

18 14 49 50.0 . 19-18.6 155-11.2 2.3 0.8 11 180 6.7 0.20 1.1 1.4 

18 16 37 41.0 19-26.4 155"29.0 4.1 1.8 14 83 11.7 0.10 0.1 1.4 

18 16 38 43.5 19-26.6 155-28.6 7.0 3.1 24 46 11.0 0.01 0.5 0.5 

18 11 22 23.9 19-23.0 155-14.4 1.9 1.7 19 109 2·.8 0.12 0.5 0.4 

18 18 52 51.4 19-23.2 155-14.81 2.2 1.1 18 105 2.4 0.11 0.4 0.5 

18 19 1 1.5 19-23.5 155-17.61 13.5 1.9 23 53 1.2 0.05 0.1 0.4 

18 19 3 2.1 19-23.3 155-14.6 4.0 1.0 11 102 2.5 0.13 0.5 1.2 

18 20 43 36.9 19-21.1 155-15.1 7.8 2.9 25 131 2.8 0.06 0.6 0.3 

18 21 51 5.0 19"23.4 155-14.7 2.5 1.1 11 100 2.5 0.10 0.4 4.0 

t-' 18 21 52 5.0 i9-23.3 155-14.4 4.5 0.5 11 106 2.6 0.08 0.4 0.8 

00 19 3 18 48.9 19-18.1 155-12.9 6.0 1.0 13 232 8.0 0.30 1.7 0.9 

19 6 37 42.4 19-33.5 155- 6.6 40.6 1.8 21 144 7.8 0.19 0.8 1.8 

19 7 48 41.4 19-19.3 155-12.1 8.0* 1.4 15 172 6.0 0.08 0.6 

19 8 37 11.1 19"19.3 155-14.7 8.0* 1.0 14 191 5.0 0.01 0.4 

19 12 22 10.4 19-23.5 155-14.9 5.4 1.9 16 97 2.4 0.07 0.4 0.1 

19 13 9 23.5 19-19.8 155-14.2 8.0* 1.4 11 158 5.6 0.07 0.6 

19 13 11 16.2 19-19.6 155-13.9 8.0* 1.0 15 160 5.7 0.08 0.6 

19 13 12 43.9 19-19.6 155-14.4 8.0* 1.1 13 160 5.4 0.09 0.7 19 13 18 35.2 19-24.6 155-16.0 1.3 1.0 15 69 1.7 0.06 0.3 0.3 

19 15 35 4.2 19-10.4 155-34.1 40.2 2.0 19 106 9.7 0.21 0.8 2.1 

19 17 52 13.4 18-58.9 155-26.4 36.9 -0.2 24 223 23.8 0.38 1.9 3.3 

19 18 11 4.7 18-52.9 155.. 7.1 8.0··0.5 24 261 47.6 0.50 3.2 

19 19 4 14.8 19-24.6 155-16.77 1.8 ·0.6 8 91 0.7 0.08 0.5 0.4 

19 19 6 11.7 19-23.4 155-14.7 2.1*-0.2 9 103 2.5 0.05 0.3 

19 19 29 36.6 19-23.3 155-14.1 5.2 "1.4 15 102 2.6 0.08 0.4 0.8 

19 19 34 29.2 19-23.3 155-14.9 2.1· 10 104 2.5 0.04 0.3 

19 19 36 42.2 19-23.3 155-14.6 5.0 13 100 2.5 0.05 0.2 0.5 

19 19 38 49.1 19"23.3 155-14.1 4.9 15 100 2.6 0.07 0.3 0.7 

.. f It ..
'. , • ,

SUMMARY OF SEISMIC EVENTS (CONTINUEO)

1912 HR MN SEC lAT N LONG W DEPTH MAG NO GAP OHIN ERT ERH 

JAN 19 19 40 9.4 19-23.4 15')-14.9 2.1 -1.7 10 103 2.5 0.06 0.3 

19 19 42 38.1 19-23.2 155-15.1 2.6 -0.8 11 104 2.1 0.07 0.3 

19 19 45 6.8 1q-23.6 155-15.1 3.9 -7.7 13 96 2.5 0.01 0.3 

19 19 49 . 2.9 19-23.4 155-14.8 4.4 -7.8 11 100 2.5 0.09 0.3 

19 19 58 23.2 19-23.3 155-14.8 2.0 -0.2 10 104 2.5 0.06 0.3 

19 20 18 4.1 19-11;'0 155-31.1 46.4 1.6 2i 100 6.4 0.35 1.5 

19 20 22 7.4 19-11.8 155-29.6 43.3 21 78 5.2 0.36 1.6 

19 20 37 22.9 18-46.1 155-16.1 8.0.-0.4 21 271 41.0 0.42 2.7 19 21 36 47.6 19-23.4 155-14.6 4.3 0.3 13 99 2.5 0.06 0.3 

19 21 55 11.2 19-24.0 155-15.1 1.8 -1.2 8 125 2.5 0.06 0.3 

19 2i 51 32.4 19-24.0 155-15.6 1.8 -1.0 10

_

11 2.6 0.03 0.2 

19 22 19 19.1 19-23.7 155-14.8 4.8 -0.1 10 91 2.0 0.13 0.4 

\0 19 22 34 26.4 19-24.2 155-16.2 1.7 -0.3 12 66 1.9 0.05' 0.3 

19 22 50 16.0 19-20.0 155-11.3 8.4 1.2 13 145 4.6 0.09 0.8 

19 23 45 32.0 19-18.5 155-15.8 1.5 18 114 4.0 0.09 0.1 

20 o 54 1.8 19-23.3 155-14.9 2.4 0.5 9 194 2.5 0.13 0.5 

20 5 42 59.1 18-52.5 155-16.1 6.2 1.1 20 255 31.0 1.23 2.4 

20 6 59 8.1 19-50.6 155-18.81 5.9 1.9 11 176 6.0 0.19 1.4 

20 10 42 55.6 19-23.1 155-14.1 2.1 10 101 2.5 0.08 0.3 

20 10 47 0.8 19-23.1 155-14.4 4.3 10 106 2.9 0.05 0.2 

20 10 51 43.1 19-23.8 155-14.9 3.1 -0.2 8 90 1.9 0.10 0.3 20 11 42 39.6 18-31.3 155-14.6 8.0*-4.2. 15 291 59.8 1.12 1.0 20 12 4 50.1 18-43.6 155-16.3 8.0*-4.6 16 285 50.3 0.67 4.3 

20 12 14 59.0 18-44.9 155-15.1 8.0*-4.4 14 282 49.8 0.60 3.9 

20 12 36 56.9 18-44.4 155-15.8 8.0* 1.8 16 283 50.1 0.61 3.9 

20 13 35 32.4 18-50.3 155-18.2 21.8*-4.4 15 267 39.3 0.43 3.2 

20 13 44 28.6 19-19.4 155-13.1 8.0* 1.9 13 166 5.9 0.07 0.5 

20 14 27 8.4 19-23.7 155-15.1 1.1 1.9 11 91 2.2. 0.06 0.2 

20 15 25 25.8 18-51.7 155-16.8 6.5 -0.5 12 263 38.2 1.37 2.9 

20 16 4 6.q 19- 8.1 155-41.51 2.9 0.1 11 131 14.1 0.21 1.4 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP DHIN ERT ERH ER

JAN 20 16 43 49.8 19"24.0 155-15.8 1.5 0.7 9 64 2.3 0.07 0.3 0

20 16 58 19.0 19-24.8 1.8. 0.3 7 105 0.5 0.04 0.2 0

20 17 15 19-24.1' 155-16.0 3.2 0.9 7 107 2.2 0.06 0.1 0

20 17 16 56.2 19-23.6 155-15.1 2.8 0.8 10 96 2.4 0.09 0.4 1

20 18 8 44.6 19"23.6 155-15.3 2.1- 0.4 11 88 2.5 0.04- 0.3 

20 18 23 19.7 19-23.8 155-15.3 1.7 0.1 9 84 2.3 0.07 0.3 0

20 18 57 49.2 19-23.7 155-15.1 2.0 0.8 10 89 2.3 0.15 0.6 0

20 21 33 41.7 19-25.3 155-16.2 1.8 -0.1 9 124 0.9 0.06 .0.4 0

20 22 4 42.2 19-19,8 155-12.9 8.2 1.6 19 145 5.0 0.07 0.5 020 23 18 3.8 19-23.9, 155"15 ••1 6.1 1.0 8 145 2.4 2.19 0.8 4

20 23 27 13.9 19-24.0 155-15.6 1.7 0.6 7 131 2.5 0.06 0.3 0

N 20 23 28 26.1 19"23.4 155-14.9 1.3 0.7 9 100 2.5 0.07 0.3 0

0 20 23 44 13.8 19-23.3 155-14.8 2.1* 0,9 9 104 2.6 0.04 0.3 

21 o 37 14.3 19-25.9 155-16.1 7.3 7 235 1.0 2.98 6.5 lS

21 o 37 40.4 19-23.0 155-14.2 3.4 0.5 7 255 .3.1 1.07 3.2 5

21 o 46 12.7 19-23.9 155-14.9 4.1 1.2 13 87 1.8 0.05 0.2 0

21 o 41 41.4 19"24.0 155-15.4 4.9 2.1 15 85 2.2 0.09 0.4 021 1 8 12.2 19-24.3 155-15.8 2.2* 0.6 10 77 2.l 0.03 0.2 

21 1 8 59.6 19-24.2 155-16.0 1.6 0.4 11 62 2.2 0.04 ·0.2 0

21 1 9 37.7 19-23.3 155-14.5 1.9 1.0 11 100 2.6 0.07 0.3 0

21 1 12 7.9 19-24.1 155-15.8 2.2* 0.7 11 65 2.4 0.03 0.2 21 1 15 33.3 19"24.2 155-16.11 2.4 0.5 7 99 2.0 0.0:3 0.2,,0

21 1 17 58.7 19-24.0 155-15.5 2.2* 0.7 7 135 2.4 0.07 0.5 

21 1 18 46.3 19-24.1 155-15.8 2.2 0.8 7 114 2.4 0.04 0.2 0

21 l 21 5.0 .19-24.0 155-15.9 1.7 0.7 9 66 2.6 0.03 0.2 0

'. ',1

21 1 21 59.0 19-23.9 IS5-15.A' 2.2* 0.9 7 123 2.2 0.08 0.5 

21 1 22 1 .1 19-24.1 155-15.6 4.7 2.1 16 71 2 •• 0.08 0.4 0

21 1 25 19-24.9 155-15'.0 4.2 0.9 8 162 1.2 0.31 0.9 1

21 1 26 21.5 19-23.8 155-15.3 1.:6 0.4 8 156 2.5 0.08 0.4 021 1 26 39.1 19-24.0 155-14.9 4.9 0.8 is 83 1.6 0.11 0.5 1

,t f- t.,

-
• • ,

_

SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAY N LONG W DEPTH MAG NO GAP DMIN ERT ERH 

JAN 21 1 31 33.8 19-24.1 155-15.9 2.1 0.9 12 63 2.3 0.06 0.2 

21 1 34 4.3 19-24.1 155-15,9 2.2* 0.1 7 113 2.3 0.04 0.2 

21 1 34 37.0 19-24.1 155-15.8 2,·0 0.2 1 118 2.4 0.05 0.3 21 1 35 55.7 19-24.1 155-15.9 2.1 1.0 8 61 2.2 0,04 0',2 21 1 31 31.9 19·24.1 155-15.7 3.6 0.6 12 76 2.5 ,0.05 0.2 21 1 38 26.1 19-24.1 155-15.9 1.1 0.1 8 III 2.3 0.06 0.4 21 1 39 24.6 19-24.1 155-15.8 2.3* 0.4 7 114 ,2.3 0.03 0,2 

21 1 40 19.6 19-23.9 155-15.7 2.3* O.T 7 128 2.4 0.08 O.S 

21 1 40 24.3 19-24.1 155-15.0 5.0 0.8 12 80 1.5 0.18 0,7 

21 1 40 '44.8 19-24',3 155-15.9 2.2* 0.5 8 104 2.2 0.06 0.5 

21 1 41 2.1 19-24.1 155-15.9 1.7 0.8 8 110 2.3 0.06 0.4 

N 21 1 41 14.1 19-24.2 155-15.8 3.5 1.1 11 80 2.3 0.07 0.3 

21 1 42 28.4 19-24.0 155-15.9 2.20 0.6 11 62 2.1 0.03 0.2 

21 1 43 14.9 19-24.1 155-15.8 2.2* 0.6 8 112 0.04 0.3 

21 1 ,.9 35.7 19-24.0 155-15.5 2.1* 0.6 8 135 2.5 0.06 0,4 

21' 2 5 18.7 19-24.2 155-16.11 1.6 -0.0 7 100 2.0 0.21 0.6 

21 2 13 46.4 19-24.2 155-16.2 2.2* 0.2 1 95 1.9 0.03 0.2 

21 2 23 7.8 19-23.8 155-15.3 3.3 1.1 8 84 2.4 0.13 0.4 

21 4 34 30.8 19-24.0 155-15.6 1.8 0.9 9 69 2.6 0.05 0.3 

21 5 25 12.8 19-23.6 155-15.0 2.7 1.0 9 94 2.3 0.10 0.3 

21 6 22 7.0 19-24.5 155"23.5 8.0* 0.6 13 185 6.8 0.09 0.6 

21 6 22 56.6 19-24.0 155-15.7 1.7 0.9 8 69 2.4 0.05 0.3 

21 1 9 21.9 19-25.9 155-16.0 3.4 0.5 10 177 0.9 0.10 0.5 21 8 58, 20.4 19-2'3.6 155-15.2 2.1* 0.7 9 95 2.5 0.04 0.3 21 9 21 49.5 18·53.4 155-20.9 11.0* 1.8 16 254 32.2 0.35 2.4 

21 9 28 20.6 18-46.3 155-16.3 8.0* 4.0 28 272 47.4 0.54 3.5 

21 10 19 39.5 19-23.9 155-1'4.9 4.6 0.7 12 87 1.8 0.04 0.2 

21 12 24 40.0 19-23.3 155-14.1 2.1* 1.1 9 106 2.7 0.3 

21 12 37 14.5 19·23.3 155-14.6 2.1· 1.1 9 107 2.7 0.04 0.3 

21 13 26 46.3 19-24.0 155-15.4 4.1 0.6 15 7S 2.3 0,12 0.5 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1912 HR MN SEC LAT N LONG W DEPTH MAG '40 GAP OMIN ERT ERH ER

JAN 21 13 31 50.2 19-23.3 155-14.8 2.2* 0.9 9 105 2.5 0.06 0.4 

21 17 5 6.6 19-23.2 155-14.5 5.5 2.5 16 103 2.7 0.06 0.4 0

21 17 20 18.0 19-20.4 155-11.8 1.7 0.9 13 156 4.1 0.09 0.8 O

21 17 52 28.9 19..19.0 155-15.2 6.1 1.3 21 146 4.3 0.08 0.6 0

21 18 31 32.9 19-23.4 155-14.6 4.4 0.4 14 97 2.4 0.07 0.3 0

21 18 36 11.6 19-23.3 155-14.7 2.0 0.7 9 104 2.6 0.06 0.3 0

21 18 36 37.2 19·12.8 15S- 4.2 46.2 2.3 ZS 216 13.3 0.29 i.s 2

21 19 27 36.7 19-23.2 155-14.3 5.S 1.0 16 104 2.8 0.06 0.4 0

21 19 47 50.8 19-23.9 155-15.5 1.1 0.3 10 76 2.4 0.04 0.2 0

21 21 24 53.6 19-23.2 155-15.1 0.9 0.2 12 104 2.1 0.05 0.2 0

21 21 38 27.2 19-23.6 155-14.9 2.8 0.6 12 95 2.2 0.10 0.5 2

N 21 21 43 6.8 19-23.3 155-14.6 5.4 1.0 16 102 2.6 0.08 0.4 0

N 21 23 25 21.1 19-23.3 155-15.1 1.5 0.5 12 103 2.1 0.07 0.3 0

21 23 28 51.3 19-23.2 155-15.1 1.5 0.7 13 104 2.1 0.06 0.3 0

21 23 32 9.4 19-23.1 155-15.1 1.2 1.1 9 109 2.0 0.06 0.3 0

22 0 8 19.7 19-20.8 155-11.6 25.3 1.6 25 10 1.3 0.12 o.e 1

22 o 17 50.6 19-21.0 155-11.6 24.9 1.5 22 73 1.8 0.11 0.7 1

22 2 26 15.2 19-23.1 155-14.3 3.6 0.8 11 106 2.9 0.01 0.3 122 2 38 46.1 19-21.0 155-12.2 8.1 1.3 20 135 2.8 0.08 0.7 0

22 2 56 52.9 19-20.1 155-11.6 8.1 0.7 12 161 4.8 0.07 0.6 1

22 4 4 53.6 19-23.7 155-15.2 1.9 0.8 9 88 2.3, 0.06 0.3 .0

22 7 7 6.8 19-23.3 155-14.7 2.0 1.0 9 104 2.6 0.13 o.s 0

22 7 57 9.5 19-13.7 155-22.7 2.5 2.8 2S 156 8.5 0.13 0.8 022 10 5 19.1 18-49.1 155-11.9 2.3 16 270 41.5 0.58 3.7 

22 11 25 41.9 155-17.3 1.5 0.3 9 97 1.2 0.05 0.3 0

22 12 40 18.8 19-13.9 155-22.6 3.0 3.2 25 156 8.6 0.12 0.7 0

22 12 59 30.4 19- 9.9 0.0 1 0 6 14 120 20.9 4.13 2.6 27

22 13 12 5.9 19-24.4 155-27.7 7.1 1.4 17 58 10.9 0.01 0.5 0

22 13 35 41.2 19-13.3 155-22.81 0.0 1.8 20 157 8.9 6.29 1.1 11

22 14 37 32.2 19-19.4 ISS- 8.9 8.0* 1.5 14 176 5.2 0.10 0.7 

• " • "
·, • I

SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERT EHH 

JAN 22 15 22 23.4 18-49.6 155-11.37 29.4* 2.6 22 202 4.1 0.32 .2.3 

22 15 46 19.0 18-38.7 1S5-15.1 8.0. 2.3 14 288 51.4 1.18 1 •• 

22 16·20 48.9 19-34.8 155- 8.1 10.1* 1.6 9 334 21.6 5.99 ,Z9.S 

22 17 51 52.1 19-23.6 155-14.8 5.0 1.6 15 94 2.2 0.08 0.4 

22 19 2S 0.1 19-23.5 155-15.0 1.4 0.7 10 99 2.5 0.06 0.3 22 20 2 33.2 19-22.9 155-14.4 2.7 .1.0 11 112 2.9 0.08 0.3 

22 20 5 19.4 18-50.6 155-16.1 1.7* 2.8 24 217 40.6 0.61 3.8 22 20 45 16.2 19-16.2 155-22.1 3.1 1.3 24 140 6.9 0.13 1.0 

22 20 52 1.6 19-16.9 155-22.7 3.4 1.5 22 132 6.2 0.10 0.1 

22 22 10 28.7 19-22.9 155-14.4 5.1 0.5 14 114 2.8 0.07 0.5 

23 1 59 58.9 19-23.8 155-15.8 1.1 O.T 9 - 71 2.1 0.04 0.2 

N 23 2 26 45.1 19-25.5 155-16.1 1.5 0.4 7 1S4 0.7 0.08 0.5 

w 23 5 6 33.4 19-20.6 155-11.7? 8.2 1.1 17 154 3.9 0.09 0.1 

23 7 5 48.9 20- 8.3 155-51.2 28.2 2.3 27 278 7.8 0.25 1.5 

23 8 13 34.7 19--19.5 155-15.5 7.3 2.0 21 142 3,5 0.06 0.5 

23 11 46 25.8 19-25.6 155-16.5 2.6 0.5 10 126 1.4 0.05 0.4 

23 13 31 19.1 19-21.1 155--11.8 25.7 2.3 27 62 2.0 0.10" 0.7 

23 13 53 27.4 19-16.5 155-22.3 2.9 1.2 11 137 6.9 0.11 0.8 

23 14 25 5.3 19-25.6 155-16.8 3.7 0.9 12 130 1.3 0.09 0".5 

23 16 15 54.8 19-25.6 155-16.5 2.5 0.6 12 152 1.4 0.04 0.3 23 18 28 49.9 19-18.9 155-20.4 6.5 1.2 16 144 3.6 0.13 1.0 23 18 46 55.9 18-51.1 155-17.31 10.8 2.5 21 259 38.6 0.42 2.4 

23 18 56 36.3 19-13.1 155-22.11 0.0 1.6 22 158 9.4 4.75 1.0 

23 19 23 16.7 18-47.6 155-15.5 8.0· 3.4 26 269 45.9 0.48 3.1 

23 19 29 20.2 19-18.0 155-11.01 7.9 1.4 11 187 7.8 0.58 3.5 

23 19 34 14.6 18-48.7 155'-16.6 8.0* 2.4 22 263 43.3 0.52 3.4 

23 19 52 36.2 19-25.7 155-16.5? 1.9 0.5 10 126 1.6 0.09 0.4 

23 20 2 9.1 18-46.9 155·-15.2 8.0* 2.4 20 271 47.2 0.60 3.9 

23 20 3 59.8 18"42.6 155- 9.3 8.0· 2.0 15 293 59.4 1.31 8.2 

23 20 5 48.4 18-50.8 155"19.5 7.2 2.6 13 277 37.5 2.01 4.7 1
SUMMARy OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH ER

JAN 23 20 18 24.4 18-51.6 155-18.4 6.8 2.6 14 262 36.9 1.29 2.8 8.

23 20 47 19.7 19-18,6 155-14.4 7.9 1.8 19 152 5.9 0,07 0.5 0

23 20 49 13.0 19-25.6 155-16.9 2.0 0.6 14 124 1.2 0.08 0.5 0

23 20 S6 53,6 19-25.4 155-16,6 3.1 0.9 15 123 1.1 0.07 0.4 0

23 21 39 28.4 19-21.9 155-25.4 6.8 1.3 17 117 4.8 0.10 0.8 0

23 21 50 41.7 19-21.6 155-25.81 0.1 1.1 23 68 5.1 1.51 0.8 5.

23 22 30 32.4 19-21.2 155-17.6 21.0 1.0 12 103 3.7 0.16 1.0 1

23 22 32 30.2 19-21.1 155-11.8 21.0 1.3 15 74 1.9 0.14 1.0 1

23 22 58 13.0 19-21.3 155-17.1 21.1 1.4 15 70 2.3 0.14 0.9 1

23 23 8 12.4 19-21.1 155-18.2 24.4 1.3 21 46 2.3 0.11 0.7 1

24 0 7 42.2 19-21.1 155"18.1 23.3 1.1 15 69 2.2 O.lS 1.0 1

N 24 1 It 53.5 19-21.5 155-17.9 25.7 2.1 2S 66 2.7 0.10 0.7 1

24 1 7 44.3 19-23.4 155-15.21 1.9 1.6 lO 98 2.3 0.06 0.5 0

24 2 2 28.0 19-20.5 155-14.1 3.4 0.9 14 195 4.4 0.23 1.3 124 2 4 12.8 19-25.6 155-16.5 2.8 1.3 11 125 1.5 0.06 0.4 0

24 2 13 36.3 19-25.3 155-16.1 2.0 0.6 10 124 1.7 0.09 0.5 0

24 2 17 52.4 19-17.5 155·12.77 0.0 1.7 20 183 9.2 7.86 1.4 14

24 2 28 35.6 19-18.7 155-15.6 5.8 1.8 20 168 4.1 0.10 O.T 0

24 3 5 50.5 19-21.9 155-25.1 6.8 1.6 17 115 4.5 0.08 0.8 0

24 4 6 9.2 19-28.3 15S-53.3 6.9 1.7 13 236 22.7 1.44 2.2 10

24 4 46 41.0 19-21.3 155-18.2 24.0 2.1 21 68 2.5 0.11 0.8 1

24 4 59 14.7 19-20.6 155-19.2 4.3 0.7 14 73 3.3 0.04 0.4 0

24 4 59 59.1 19-18.1 155-15.3 5.5 1.0 19 148 4.4 0.12 0.8 0

24 7 12 56.2 19-29.2 155-39.8 3.0 1.6 17 98 26.9 0.14 0.8 1

24 9 22 35.1 19-21.2 155-18.2 23.3 2.0 19 S2 2.5 0.11 0.1 1

24 18 37 44.0 19-16.0 155-22.6 1.0 1.8 20 140 7.3 1,44 0.9 5.

24 19 48 55.6 19-21.5 155-18.1 22.7 2.0 21 58 2.9 0.08 0.6 0

25 5 21 22.1 19-20.6 155-13.1 6 •• 1.7 17 149 3.5 0.11 0.9 0.

25 5 49 49.7 18-50.6 155-16.7 6.2 2.0 18 261 40.0 1.66 3.6 10

25 7 S9 31.2 19-23.2 155-14.8 2.1 0.9 8 101 2,5 0.12 0.5 0.

• • " ..
• .. ,

SUMMARY OF SEISMIC EVENTS (CONTINUEO)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH 

JAN 25 8 43 19-24.7 155-16.61 0.9 0.3 8 141 0.8 0.14 0.4 

25 9 18 34.0 19-24.1 155-15.8 1.9 0.8 1 118 2 •• 0.09 0.5 

25 10 30 19.6 18-50.0 155-15.8 1.5· 2.2 18 269 41.8 0.68 4,3 

25 10 32 3.3 19-22.1 15S-16.9 19.5 1.5 14 93 1.9 0.16 0.9 

25 13 9 32.3 19-19.9 155-14.3 8.0· 1•.0 12 182 5.5 0.12 0.9 

25 13 48 39.5 19-23.5 155-29.01 7.5 2.7 26 41 11.1 0.12 0.6 

25 14 SI 50.8 19-24.9 155-11.0 1.7 0.5 9 144 0.0 0.06 0.4 

25 15 48 57.6 19- 8.• 4 45.0 1.·8 19 158 4.8 0.43 1.8 

25 19 24 57.9 19-23.5 155-14.4 5.0 0.7 11 103 2.2 0.10 0.4 

25 20 1 14.2 19-25.4 155-16.2 2.0 0.4 9 125 1.7 0.10 0•• 

2S 20 21 49.8 19-23.4 155-14.9 3._ 0.4 1·0 99 2.5 0.08 0.4 

N 25 20 40 35.2 19-24.6 155-16.5 1.3 0.4 10 139 1.0 0.04 0.3 

V1 25 21 22 8.3 19-19.6 155-11.4 8.6 1.1 13 169 5.3 0.09 0.7 

25 22 3 12.1 19-24.8 155-16.4 1.4 0.6 8 ISS 1.1 0.02 0.1 

25 23 41 13.9 19-21.0 155-17.1 25.8 1.4 16 118 1.1 0.32 2.2 

26 1 1 12.5 19-23.9 155-15.1 2.8 1.1 8 102 1.9 0.16 O.S 

26 5 52 .13.2 18"45.9 155-14.6 8.0· 2.7 23 273 49.4 0.69 4.4 

26 7 15 6.7 19-23.4 155-14.9 1.4 0.6 9 101 2.5 0.07 0.4 

26 '7 28 48.8 19-21.7 155-17.8 25.7 2.3 23 79 3.1 O.le 1.1 

26 9 8 5.9 19-23.4 155-15.1 2.2* 0.9 10 100 2.3 0.06 0.5 

26 9 26 36.5 19-23.6 155-.14.9 2.9 0.9 7 9S l.i 0.18 0.6 

2·6 9 38 15.3 19-24.5 155-16.4 1.1 0.4 10 136 1.3 0.06 0.3 

26 9 39 15.2 19-24,6 155"16.2 1.4 0.6 13 11& 1.5 0.08 0.4 

26 11 42 22.0 19-22.7 155-26.2 6.6 1.0 21 52 6.9 0.10 0.8 

26 15 52 39.6 19-23.7 155-14.7 5.4 1.0 16 90 1.9 0.08 0.4 26 18 o 22.1 19-23.2 155-14.5 3.1 0.8 11 104 2.8 0.08 0.3 

26 20 18 51.0 19-19.6 155- 9.1 8.7 1.3 14 173 4.8 0.09 0.7 

26 20 19 29.5 19-23.4 155--14.9 2.7 0.5 11 98 2.5 0.08 0.4 

26 23 7 39.0 19-21.1 155-13.5 8.7 1.9 17 140 2.9 0.05 0.4 

21 o 27 6.3 19-21.9 155-24.31 1.2 0.9 14 126 3.6 O.IA 1.1 
SUMMARY OF SEISMIC EVENTS (CONTINUEO)

1912 HR HN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH 

JAN 21 o 29 44.1 19-25.6 155-16.5 2.1 0.1 11 125 1.4 0.05 0.3 

21 2 36 26.2 19-23.3 155-14.4 1.8 1.1 11 104 2.6 0.09 0.5 

21 2 40'1':: 8 1'55-'14.4 1':4 0.6 11 102 2.5 0.11' 0.5 

21 2 41 5.9 19-23.2 155-14.3 1.9 1. 1 11 108 2.8 0.08 0.4 

21 2 43 33.0 19-15.2 155-21.4 2.8 2.7 25 152 9.6 0.11 0.1 

27 2 58 60.0 19-15.5 155-22.3 2.0 1.5' 20 144 1.9 1.19 0.1 

21 3 13 16.0 19-15.9 155-22.8 2.6 1.6 21 139 6.9 0.11 0.8 

27 3 54 50.2 19-15.1 155-22'.6 0.5 1.8 22 142 7.4 5.60 1.0 1

21 4 1 56.1 19-16.5 155-23.4 3.3 1.2 21 131 5.7 0.10 0.8 

21 5 21 40.4 18-51.9 155-15.8? 0.4 3.0 27 257 38.8 0.35 2.3 

27 5 52 41.1 19-23.3 155-14.6 3.7 1.3 10 105 2.6 0.08 0.3 

N 21 6 41 54.8 19-17.0 155-23.3 3.8 1.1 17 129 6.0 0.10 0.9 

0\ 21 6 43 2'3.8 19-15.7 155-22.0 3.2 1.1 18 108 2.4 0.16 0.9 

27 1 50 21.4 19-22.9 155-14.3 3.0 0.8 10 113 2.9 0.04 0.2 

21 8 26 59.9 19-23.6 155-14.8 4.1 0.9 12 92 2.1 0.11 0.5 

21 11 48 49.9 19-24.2 155-17.6 2.0 0.5 1 113 1.7 0.05 0.3 

27 12 40 45.0 19-23.2 155-14.8 2.2* 1.1 9 110 2.4 0.04 0.3 

27 13 53 1.3 19-23.8 155-15.5 3.0 1.3 15 81 2.6 0.09 0.5 

21 15 34 1.2 19-22.5 155-22.4 6.8 1.0 16 151 4.6 0.11 0.8 

27 15 45 13.6 19-23.3 155-14.7 4.1 1.6 11 105 2.6 0.01 0.3 

27 15 46 52.3 19-23.4 155-14.9 2.1* 0.9 8 101 2.5 0.04 0.2 

27 15 47 35.5 19-23.4 155-14.8 2.1 0.9 8 100 2.4 0.09 0.3 

21 16 9 25.0 19-22.8 155-14.1 4.5 1.5 11 111 2.7 0.23 0.8 

21 16 10 19.6 19-23.4 155-14.1 3.9 1.0 12 100 2.5 0.06 0.3 

21 16 11 15.9 19-23.3 155-14.8 1.9 1.3 11 102 2.5 0.08 

21 16 18 2.3 19-23.4 155-15.0 2.5 0.8 9 102 ,2.4 0.05 0.2 

27 16 24 8.7 19-23.2 155-14.9 2.7 1.2 11 106 2.2 0.06 0.3 

21 16 34 4.1 19-23'.3 155-14.6 4.0 0.6 11 100 2.5 0.10 0.4 

21 16 53 40.6 19-23.3 155-14.8 3.1 1.3 11 101 2.5 0.09 0.3 

27 16 53 40.8 19-23.3 155-14.8 2.0 0.6 8 104 2.6 0.05 0.3 

• • • t;
• .. I.

SUMMARY Of SEISMIC EVENTS CCONTINUED)

1912 HR MN SEC lAT N lONGW DEPTH MAG NO GAP OMIN ERT ERH 

JAN 21 16 59 17.2 19-23.1 155-14.1 2.6 1.1 11 108 2.4 0.01 0.3' 

21 11 11 58.2 19-23.8 1-55-14.4 3.,8 0.5 13 85 1.6 0.14 0.6 

21 17 41 55.2 19-22.9 5.8 1.0 16 113 2.5 0.09 0.4 

27 18 18 59.4 2.1 0.1 9 114 2.,4 0.09 0.4 

21 1'8 41 15.2 19-23.. 3 155-14.1 2.1* 0.8 9 104 2.6 0.05 0.3 21 18 57 10.3 19-23.3 155-14.8 1.4 0.8 11 102 2.5 0'.08 0.4 

21 20 50 19-23.6 155-15.0 2.1 0.9 9 95 2.3 0.11 0.4 

27 21 32 4.0 19-26.0 155-16.1 3.1 0.8 7 247 1.9 0.35 1.3' 

28 o 58 26.1 19-23.4 155-14.9 3.0 0.7 9 102 2.5 0.14 0.5 

28 1 6 29.2 19-23.1 155-14.6 2.8 0.9 '9 113 2.7 0.3 

28 1 58 13.2 19-23.3 155-14.1 2.1* 0.9 9 106 2.6 0.05 0.3 

N 28 2 57 31.9 19-19.8 155-11.9 9.3 1.1 15 165 5.1 0.01 0.5 

....... 28 3 8 4.7 19c-23.4 155-15.8 3.6 1.1 1-5 11 1.9 0.15 0.1 

28 3 15 12.7 19-23.3 155-14.1 2.4 0.6 10 104 2.6 0.06 0.3 

28 4 29 57.5 19-2 1 • 8 15'5-1 7 • 1 23.6 1.2 15 96 3.1 0.14 0.8 

28 5 13 18.2 19-23.0 155-14.5 3.2. 1.2 9 116 2.6 0.10 0.3 

28 5 16 49.1 19-23.2 155-14.6 2.1* 0.1 10 109 2.7 0.04 0.3 

28 5 19 58.3 19-23'.3 155-15.0 2.5 0.1 9 III 2.3' 0.06 0.3 28 5 40 14.1 19-23.2 155-14.7 2.7 0.8 10 109 2.5 0.06 0.3 

28 5 54 37.9 19-23.3 155-14.1 2.1* 0.3 9 106 2.6 0.05 0.3 

28 5 51 55.4 19-23.2 155-14.5 2,.1*,0.6 1 101 2.7 0.05 0.4 

28 6 13 46.4 19-23.0 155-14.4 3.1 0.6 10 109 2.8 0.09 0.4 

28 6 17 34.9 19-23.4 155-14.8 2.5 0.8 9 103 2.6 0.08 0.3 

28 6 19 54.7 19-23.0 155-14.5' 3.0 1.0 8 114 2.8 0.10 0.3 

28 6 20 33.4 19-22.9 155-14.1 2.0 0.8 10 112 2.4 0.08 0.3 

28 6 21 38.9 19-23.3 155-14.8 2.0 0.9 6 111 2.5 0.03 0.1 

28 6 27 15.3 19-23.3 155-14.3 2.1* 0.8 11 101 2.5 0.08 0.6 

28 6 28 3.9 19-23.4 155-15.1 1.2 1.0 8 181 2.3 0.07 0.4 

28 6 36 2.3 19-23.3 155-14.5 5.2 0.5 12 101 2.6 0.09 0.3 

28 6 37 57.8 19-23.2 155-14.5 2.1* 1.0 9 109 2.8 0.04 0.3 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH E

JAN 28 6 40 0.9 19-23.2 155-14.8 2.1* 1.0 10 101 2.5 0.04 0.3 

28 6 41 11.5 19-23.1 155-14.7 5.2 1.2 14 108 2.4 0.06 0.4 0

28 6 42 4.9 19-23.1 155-14.1 2.1* 1.0 9 112 2.5 0.04 0.3 

28 6 43 37.2 19-23.4 155-14.7 2.0 1.1 13 99 2.5 0.01 0.3 0

28 6 45 32.8 19-23.3 155-15.1 2.4 1.2 11 102 2.2 0.08 0.3 1

28 6 46 31.3 19-23.2 155-14.1 3.4 0.8 14 101 2.7 0.06 0.3 1

28 6 48 32.0 19-23.3 155-14.7 3.3 1.1 8 105 2.6 0.13 0.4 28 6 48 59.0 19-2 3. 3 155- 14 •. 5 4.8 0.6 13 100 2.5 0.08 0.3 0

28 6 49 54.1 19-22.9 155-14.6 1.5 0.5 12 112 2.4 0.·06 0.3 0

28 1 13 40.1 19-23.1 155-14.1 2.1* 0.9 9 110 2.5 0.04 0.3 

28 1 14 32.6 lq-23.2 155-14.6 2.6 0.8 9 108 2.1 0.17 0.6 2

N 28 7 15 59.9 19-23.4 155-14.9 2.0 1.2 11 100 2.4 0.10 0.3 0

OJ 28 1 19 9.6 19-23.0 155-14.3 4.6 1.9 13· 110 3.0 0.20 0.8 2

28 7 21 26.0 19-23.1 155-14.6 2.3* 0.8 10 110 2.1 0.03 0.2 

28 7 21 56.9 19-23.3 155-14.5 5.6 1.4 16 100 2.5 0.06 0.4 0

28 7 24 25.5 19-23.2 155-14.7 2.9 0.9 10 108 2.6 0.06 0.3 

28 7 24 53.0 19-23.3 155-14.2 1.8 1.1 10 114 2.5 0.10 0.6 0

28 7 26 12.4 19-23.3 155-14.8 3.1 1.2 10 102· 2.5 0.13 0.5 

28 1 21 34.0 19-23.0 155-14.8 1.8 0.9 9 115 2.2 0.06 0.3 0

28 1 28 ·3.8 19-23.2 155-15.1 2.8 1.0 11 104 2.0 0.08 0.3 

28 1 29 21.1 19-23.1 155-14.1 3.1 1.1 10 108 2.5 0.09 0.3 

28 7 30 32.2 19-23.2 155-15.0- 2.3* 0.8 11 106 2.2 0.03 0.2 

28 7 .31 13.0 19-23.1 155-14.8 1.6' 0.5 10 113 2.3 0.08 0.4 0

28 1 32 1.7 19-23.1 155-14.8 2.0 0.8 10 108 2.2 0.09 0.3 0

28 7 33 18.9 19-2,3.4 155-14.6 1.2 0.1 11 99 2.5 0.12 0.5 0

28 1 34 15.1 19-23.1 155-14.1 2.1* 1.4 8 111 2.5 0.05 0.3 

28 1 34 42.8 19-23.0 155-14.5 2.0 1.2 10 109 2.7 0.06 0.3 0

28 1 36 13.1 19-23.1 155-15.0 2.1 1.0 11 101 2.1 0.07 0.3 

28 7 37 2.1 19-22.9 155-14.9 1.0 0.9 11 113 2.0 0.05 0.2 0

28 7 38 41.5 19-23.4 155-15.0 1.3 0.6 9 106 2.5 0.01 0.4 0

• 4& • 1\
• • • I

SUMMARY OF SEISMIC EVENTS (CONTINUED)

1912 HR MN SEC LAT N LONG W OEPTH MAG NO GAP DMIN ERT ERH 

JAN 28 7 40 12.8 19-23.1 155-14.7 2.8 1.1 10 101 2.5 0.07 0.3 

28 1 41 10.0 19-23.1 155-14.9 2.1* 1.2 9 93 2.1 0.05 0.3 

28 7 44 36.7 19-23.2 155-14.8 2.1* 0.8 9 106 2.5 0.05 .0.3 

28 1 49 21.8 19-23.1 155-15.0 4.2 : 1.'3 12 109 2.0 0.10 0.4 

28 7 '50 27.4 19-23.2 155-14.8 2.3* 0.1 8 122 2.5 0.07 0.5 

28 7 50 38.7 19-23.4 155-15.0 2.1 0.8 9 103 2.4 0.12 0.5 

·28 7 50 54.4 .19-21.2 155-10.0 12.2* 1.1 1 332 10.0 1..'01 6.6 

28 7 56 15.6 155-15.0 3.0 1.1 9 91 2.4 0.10 0.3 

28 8 19 0.1 19-23.4 155-14.8 2.8 11 99 2.5 0.06 0.5 

28, 9 51 18.1 19-25.0 155-11.1 2.6 1.3 12 111 0.2 . 0'.07 0.5 

28 9 58 53.1 19-21.1 155-13.9 6.3 1.0 16 159 3.3 0.13 0.8 

N 28 10 14 16.1 19-23.1 155-14.4 3.8 1.8 18 106 2.9 0.06 0.5 

\0 28 10 31 12.6, 19-23.3 155-15.1 2.5 1.1 11 101 2.2 0.08 0.3 

28 11 1 12.3 19-23.9 155-15.2 2.1 1.0 9 84 2.2 0.06 0.2 

28 16 34 7.9 19-22.4 155-15.7 28.6 24 111 0.4 0.12 0.8 28 21 7 15.1 19-18.3 155-16.0 3.5 1.1 21 146 4.6 0.14 0.9 

29 2 14 49.5 18-45.8 155-16.6 12.8 4.1 30 214 41.1 0.30 3.4 

29 3 11 48.6 19-19.8 155-12.61 3.6 1.6 24 146 4.9 0.15 1.0 

29 3 57 16.1 19-20.4 155- 8.8 4.3 1.5 20 160 3.5 0.13 0.9 

29 4 24 34.4 19-44.3 156- 9.0 47.1 3.1 27 251 33.2 0.38 1.8 

29 5 30 12.8 19-19.9 155- 1.0? 0.1 2.5 28 147· 6.4 4.81 1.2 

29 9 10 28.4 18-48.4 155'-21.0 0.4* 2.8 18 211 38.5 0.69 4.4 

29 10 11 36.5 19-20.6 155-19.6 3.4 1.3 12 104 4.0 0.14 0.5 

29 10 22 50.7 18-49.2 155-20.5 0.6* 2.8 13 281 38.5 0.77 4.8 

29 16 o 52.6 18-52.1 155-19.0 6.7 2.7 17 260 35.7 1.22 2.6 

29 16 24 .53.4 19-19.0 155-13.41 8.0 2.0 20 150 6.6 0.01 0.5 

29 17 8 25.0 19-15.9 155-21.8 6.9 1.6 19 144 6.1 0.08 0.7 

29 20 44 52.9 19-19.3 155- 8.3 1.0 2eO 23 159 5.8 1.25 0.9 

Zq 22 49 16.6 19-20.5 155- 1.9 4.2 1.4 17 158 4.4 0.13 0.9 

29 22 56 33.9 18-46.0 155-16.2 8.0* 2.8 25 273 48.0 0.49 3.2 
SUMMARY OF SEISMIC EVENTS (CONTINUEO)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERT ERH 

JAN 30 2 15 29.2 19-15.6 155- 8.5 35.3 1.1 13 235 12.2 0.37 1.8 

30 3 2 34.4 18-53.5 155-16.11 11.1 2.8 22 252 36.0 0.30 1.1 30 5 51 44.4 19-46.6 156- 4.8 31.8 2.2 21 240 27.2 0.32 1.1 

30 6 51 56.8 19-23.8 155-14.8 5.0 1.9 16 87 1.8 0.07 0.4 

30 14 19 50.2 19-22.1 155-25.4 8.0* 1.5 11 69 5.2 0.10 0.9 

30 14 25 16.0 19-23.2 155-24.5 2.7 1.6 18 68 5.8 0.11 0.8 

30 15 19 25.4 19-23.4 155-24.1 8.0* 1.5 19 10 6.1 0.09 0.8 

30 16 31 44.3 19-20.0 155-15.2 6.6 0.1 15 139 3.9 0.09 0.8 

30 17 38 52.9 19-18.5 155-14.8 6.1 1.1 18 151 5.5 0.10 0.7 

30 21 18 52.0 19-20.4 155-18.9 6.5 0.7 12 71 2.7 0.14 0.5 

30 22 28 30.6 19-10.5 155-22.4 43.1 1.6 20 179 9.1 0.21 1.2 

UJ 31 o 35 23.q 19-23.2 155-24.0 9.3 1.3 19 68 5.6 0.04 0.4 

0 31 1 49 5.1 19-10.4 155-36.4 8.5 1.5 11 99 8.3 0.09 0.9 

31 2 22 40.0 19-19.6 155-14.3 8.0* 1.2 16 161 5.6 0.08 0.7 

31 13 24 46.1 19-16.6 155-23.3 4.0 1.8 14 131 6.6 0.08 o.e 

31 15 53 49.9 19-20.0 155-24.9 5.8 1.9 19 86 11.3 0.08 0.7 

31 21 15 41.8 19-19.8 155- 8.4 8.0* 1.2 15 110 4.9 0.13 1.1 

31 22 18 53.6 19-20.4 155-11.91 1.5 1.3 18 141 4.1 0.08 0.1 

FEB 1 3 5 57.1 19-20.9 155-16.2 34.8 1.5 19 123 2.6 0.12 0.8 

1 10 32 54.9 19-14.4 155-20.91 0.0 2.2 22 15"1 1.6 4.01 0.1 

1 12 16 54.3 19-22.3 155-23.8 8.1 1.4 19 112 4.0 0.08 0.6 

1 12 20 31.3 19-20.9 155- 8.3 6.4 1.5 18 131 3.4 0.10 0.8 

1 13 52 37.1 18-49.1 155-18.3 0.1* 2.9 24 264 41.2 0.39 2.5 

1 18 11 55.7 19-19.8 155- 8.4 8.0* 1.3 13 110 4.9 0.12 1.1 

1 23 52 41.3 19-19.1 155-15.4 6.1 1.0 14 110 3.8 0.10 0.8 

2 o 13 1.9 19-23.4 155-17.1 12.1 2.1 22 55 0.2 0.06 0.7 

2 o 24 7.8 lq-22.4 155-14.2 3.3 0.9 11 128 2.7 0.09 0.4 

2 o 30 49.7 20-32.4 156-30.6 95.4* 2.5 11 326 88.9 0.95 6.9 

2 1 50 56.8 19-21.9 155-18.0 4.6 1.2 15 74 3.4 0.04 0.3 

2 2 1 53.4 19-21.1 155-20.1 31.q 1.1 23 57 4.8 0.14 0.9 

• • • ,
• • • ,

SUMMARY OF SEISMIC EVENTS (CONTINUED)

1912 HR MN SEC lAT N LONG W OEPTH HAG NO GAP DHIN ERT ERH 

FEB 2 5 53 31.0 19-12.3 10.1 3.3 19 227 5.0 0.15 1.2 

2 5 51 12.5 19-22.3 155-18.0 1.6 0.5 9 124 2.8 0.06 0.3 

2 1 51 43.1 19-22.0 155-10.6 5.2 1.3 13 159 1.4 0.19 1.1 

2 12 14 36.1 19-14.1 155- 8.0 31.0 18 204 14.0 0.28 1.5 2 18 4 55.5 19-21.9 155-18.0?' 1.1 1.0 20 75 3.2 0.16 0.4 

2 18 9 44.4 '19-19.6 155- 7.6 1.1 2.0 20 114 6.1 1.08 1.0 

2 20 18 41.3' 19-21.3 155-25.11 1.9 1.5 21 74 4.1 0.09 0.6 

2 20 20 40.1 19-19.1 155-11.9 6.9 1.3 11 161 5.3 0.13 0.9 

2' 20 29 48.4 19-22.3 155-23.9 8.0 2.2 21 51 4.0 0.08 0.6 

3 o 21 2.3 19-20.1 155-25.6 4.1 0.1 18 81 4.1 0.09 0.8 

3 1 2 11.3 19-25".9 155-41.4 5.4 1.9 21 '145 20.3 0.11 1.1 

w 3 1 Zq 40.4 1 9-14. 1 1 55- 8. 3 36.8 1.5 14 202 14.2 0.11 0.9 

..... 3' 2 3 48.9 lQ-33.0 155- 1.4 8.0* 1.1 12 257 8.1 0.55 3.8 

3 5 11 19.1 19-13.9 155- 1.2 39.7 2.1 22 203 13.4 0.21 .1. 1 

3 6 43 12.9 19-18.8 155-13.0 5.9 1.1 21 154 6.8 0.12 0.8 

3 6 57 59.1 1 9 - 2 3'. 5 1 5 5- 1 5. 1 2.3* 0.1 10 99 2.4 0.04 0.3 

3 7' 4 51.1 19-20.2 155-12.2 5.6 2.6 25 139 4.2 0.10 0.7 

3 8 45 16.5 '18-42.9 155-19.5 8.0* 2.1 11 281 46.4 0.52 3,.4 

3 9 51 48.5 19-19.0 155-12.1 8.0* 1.5 13 177 6.5 0.13 1.0 

3 12 10 12.5 19-22.4 155-13.3 6.0 0.9 13 123 1.1 0.08 0.5 

3 14 31 39.4 19-21.8 155-13.0 5.8 1.2 13 133 1.3 0.09 0.1 

3 16 26 34.8 lq-23.5 155-24.4 7.1 1.9 24 55 6.4 0.08 0.1 

3 11 2 21.1 19-19.8 1'55-14.0 8.0* 1.1 18 142 5.4 0.01 0.5 

3 17 25 21.5 19- 8.8 155-21.8 36.4 1.6 14 111 1.3 0.32 1.6 

3 20 50 1.4 19-20.3 155-19.1 5.3 1.2 14 100 3.0 0.08 0.4 

4 o 23 21.0 19-22.0 155-18.4 1.5 0.8 10 75 3.6 0.12 0.3 

4 1 45 46.9 19-21.6 155-24.01 8.2 2.1 20 60 2.9 0.07 0.6 

4 1 54 53.4 19-19.8 155-15.9 6.1 1.0 11 139 2.1 0.07 0.6 

4 1 57 14.4 18-56.6 155-26.8 33.6 3.0 24 236 23.4 0.33 1.8 

4 3 11 8.8 19-18.3 155-15.41 8.1 1.5 18 179 4.8 0.09 0.7 
SUMMARY Of SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W OEPTH MAG NO GAP DMIN ERT ERH 

FEB 4 3 25 6.1 19-19.6 155- 8.1 3.6 2.3 20 156 5.5 0.15 0.9 

4 3 48 2.1 19-21.1 155-11.5 28.5 1.2 14 82 1.9 0.19 1.2 

4 4 6 3.2 19-21.5 155-11.9 29.5 3.2 26 64 2.1 0.13 0.8 

4 4 31 8.0 18-56.5 155-21.21 42.0* 1.8 21 241 26.7 0.17 1.5 

4 4 31 57.1 19-21.8 155-17.1 28.0 1.3 12 73 3.1 0.30 1.5 2

4 5 3 23.6 19-22.3 155-20.81 8.0* 0.8 10 115 5.8 0.21 1.8 

4 5 3 46.3 19-21.9 155-11.9 24.4 1.2 12 68 3.2 0.35 1.9 3

4 5 5 54.0 19-21.5 155-18.3 24.6 1.6 14 14 3.0 0.19 1.1 

4 5 36 23.2 19-22.1 155-12.1 4.4 1.1 13 131 0.1 0.07 0.4 0

4 6 43 16.2 19-22.0 155-18.2 1.5 0.6 9 78 3.4 0.05 0.3 0

4 6 52 53.5 19-20.1 155- 1.4 3.7 2.2 18 139 5.1 0.12 0.9 0

w 4 1 5 27.1 20- 5.4 156-12.1 8.0* 1.6 13 319 97.9 2.30 13.8 

N 4 7 50 29.6 19-21.5 155-18.2 25.1 1.1 14 12 2.9 0.19 1.0 

4 13 10 42.1 19-17.0 1')5-13.5 29.4 2.6 22 160 8.9 0.15 0.9 

4 15 36 27.7 19-21.8 155-11.6 6.2 0.8 14 11 3.0 0.09 0.6 0

4 16 14 26.9 19-28.8 155-11.6 8.0* 1.5 11 222 9.4 0.36 2.3 

4 21 1 30.4 lq-19.5 155-11.4 30.3 2.4 18 129 1.1 0.21 1.2 2

5 8 o 39.3 19-19.3 155-15.5 6.5 0.1 13 182 3.6 0.14 0.9 0

5 13 36 42.7 19-24.2 155-15.0 11.8 1.0 17 82 1.4 0.06 0.4 0

5 14 11 23.6 19-22.8 155- 2.7 8.0* 1.6 8 129 5.4 0.18 1.6 

5 18 8 51.0 19-22.1 155-12.6 4.5 0.1 11 130 0.6 0.09- 0.5 

5 18 50 23.5 19-21.9 155-13.3 2.1 0.8 9 144 1.4 0.05 0.3 0

5 18 59 29.0 19-21.2 155-11.5 8.6 1.2 16 134 3._0 0.01 0.6 

5 19 6 23.4 19-20.5 155-11.0 9.1 0.9

_

12 151 3.5 0.08 0.6 

6 o 11 5-S. 1 19-19.9 155-:13.1 7.8 1.0 19 143 4.1 0.01 0.6 0

6 1 22 43.1 19-20.6 155-13.4 8.0* 13 148 5.5 0.08 0.7 

6 8 26 46.4 19-24.2 155-16.11 2.2 0.-9 7 99 2.0 0.09 0.4 0

6 9 41 14.1 19-22.6 155-24.61 8.2 2.3 22 68 4.9 0.08 0.5 0

6 11 41 55.6 19-22.3 155-12.9 5.7 0.6 11 139 0.5 0.05 0.4 0

6 13 50 15.6 18-50.1 155-16.8 5.2 2.2 12 262 40.8 1.30 2.9 

• « " •
.. c " ,

SUMMARY Of SEISMIC EVENTS (CONTINUED)

'1912 HR MN SEC lAT N LONG W DEPTH MAG NO GAP DMIN ERr ERH 

FEB 6 23 21 19.8 19-19.9 155-13.2 7.6 1.3 15 159 4.8 0.·10 0.8 

6 23 26 10.3 18-46.8 155-17.8 2.5 16 277 44.9 0.45 3.0 

7 o 15 39.9 18-49.5 155-17.8? 0.3 2.6 21 264 41.0 0.68 4.6 

1 o 57 21.2 155... 15.8 4.9 2.3 16 302 49.9 0.42 7.4 

7 16 24 32.7 19-25.9 155-27.5 7.5 1.5 20 113 10.3· 0.10 0.6 

7 17 :3 30.1 19-20.5 155-12.6 7.5 2.1 20 140 3.7 0.09 0.8 

7 11 35 41.1 19-21.8 155-12.4 5.4 0.6 12 135 1.2 0.08 0.5 

1 18 1 36.1 19-22.1 155-13.0 6.0 0.9 14 129 0.9 0.06 0.5 

7 18 16 0.6 19-18.3 155-14.5 8.0* 0.9. 14 153 6.0 0.07 0.6 

7 22 28 58.0 19-22.4 155-24.0 6.1 1.3 16 126 4.1 0 •. 07 0.6 

7 23 58 18.9 19-17.5 155-14.1 6.8 2.1 22 156 1.5 0.14 0.9 

w 8 1 8 48.8 18--49.9 155-19.1 3.3 1.9 18 262 38.9 1.52 3.3 

w 8 1 16 8.0 18-48.4 155-17.6 8.0* 2.8. 19 266 0.45 3.0 

8 1 42 39.7 19-19.8 155-12.0 4.1 2.4 20 147 5.1 0.15 1.0 8 1 45 9.1 19-21.2 155-13.1 1.6 1.2 14 156 2.4 0.09 0.9 

8 1 58 23.9 19-19.6 155-15.4 8.0 2.6 20 139. 3.5 0.06 0.5 

8 5 56 55.1 19--18.6 155-14.6 8.0* 1.1 13 178 5.1 0.11 0.8 

8 7 19 27.7 19-21.5 155-12.6 1.2 0.6 14 138 1.1 ·0.01 0.1 

8 7 33 8.4 19-20.2 155-16.8 6.5 0.8' 12 166 1.0 0.07 0.5 

8 10 13 1.1 18-46.1 155-18.4 8.0* 2.7 16 2'13 44. 7 0.52 3.4 

8 14 22 35.0 19-22.4 155-25.5 8.0* 1.1 13 185 10.4 0.15 1.1 

8 14 56 44.9 19-22.9 155-23.4 5.1 1.3 12 184 4.9 0.16 0.8 

8 18 10 11.0 19-2'0.5 155-12.1 1.3 1.8 18 140 3.1 0.09 0.8 

8 19 3 47.4 19-15.9 155-18.9 29.1 1.8 22 155 3.8 0.13 0.7 

8 20 45 14.8 19-23.4 155-24.9 1.4 1.0 17 120 6.5 0.10 0.1 

8 23 10 34.2 18-'t9.3 155-18.3 8.0* 2.6 14 264 41.0 0.31 2.0 

8 23 18 19.1 19-21.8 155-24.8 4.1 2.4 23 66 4.0 0.09 0.8 

8 23 20 9.2 19-21.7 155-24.9 4.5 1.9 21 61 4.0 0.08 0.1 

8 23 21 49.8 18-43.5 155-11.4 8.0* 2.3 12 290 48.7 0.98 6.2 

8 23 29 1.6 18-47.1 155-17.8 8.0* 2.5 13 270 44.4 0.61 4.0 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO DMIN ERT ERH 

FEB 8 23 30 29.7 18-49.1 155-18.4 8.0* 2.6 13 265 41.2 0.28 1.8 

8 23 35 8.9 18-48.4 155-17.9 8.0* 2.6 15 261 42.8 0.34 2.2 

9 o 28 57.1 18-48.7 155-17.2 8.0* 2.4 18 266 42.1 0.53 3.5 

9 2 54 11.5 1q-22.5 155-28.1 4.2 1.8 17 133 9.4 0.11 0.1 

9 3 6 20.9 19-13.8 155-21.5 8.6 1.5 21 110 5.0 0.06 0.8 

9 4 51 54.9 19-13.3 155- 6.8 38.0 1.1 15 206 11.0 0.25 1.4 

9 b 3 6.1 18-48.3 155-17.8 8.0* 2.6 14 261 42s9 0.38 2.5 

9 7 3 44.6 18-52.6 155-20.9 5.1 2.5 17 257 33.5 1.33 2.8 

9 18 54 16.9 18-51.2 155-18.6 11.0* 2.9 16 259 37.4 0.31 2.5 

10 3 13 6.9 18-46.2 155-17.5 8.0* 2.1 14 213 45.9 0.41 2.1 

10 9 22 55.4 1Q-20.0 155-14.1 8.0* 0.1 13 150 4.8 0.11 0.8 

w 10 13 o 10.4 19-14.9 155- 4.6 42.9 2.5 20 226 9.6 0.23 1.2 

10 15 12 33.9 19- 6.0 155-14.2 6.0 12 247 23.4 1.96 3.6 1

10 15 54 2'7.8 19-24.1 155-24.4 4.3 1.2 15 130 1.4 0.14 0.9 

10 11 1 22.4 18-41.3 155-17.5 8.0* 2.7 17 270 4408 0.48 3.2 

10 23 17 22.3 19-14.2 155- 7.2 40.5 2.• 8 21 202 12.9 0.27 1.5 

1 1 4 53 8.7 18-50.9 155-16.1 1.8* 2.6 14 260 39.6 0.41 3.1 

11 7 51 40 •.5 19-16.5 155-18.1 26.3 2.1 16 188 2.8 0.20 1.4 

11 11 31 3.6 19-18.8 155-12.1 2.6 1.7 21 111 6.8 0.18 

12 9 38 29.3 19-21.3 155-23.8 6.1 2.0 18 55 2.3 0.09 0.9 

12 18 18 48.q 19-20.5 155-17.2 32.1 2.5 22 115' 0.7 0.15 0.9 

12 19 52 51.1 lq-21.7 155-15.1 23.8 1.1 16 123 1.9 0.13 0.9 

12 22 4054.6 19-23.2 155-28.1 4.5 1.8 21 57 10.1 0.09 0.1 

12 23 28 27.5 18-59.8 155-14.1 30.2 2.6 21 240 34.5 0.31 2.1 

13 .5 23 37.5 19-19.1 155-11.0 7.1 0.6 11 111 1.0 0.09 0.7 

13 12 26 2.9 19-25.5 155-29.2 6.7 2.3 18 68 13.0 0.09 0.7 

13175541.9 lQ-20.3 155- 8.9 .3. 'i 2.1 23 1.45 10.5 0.12 0.8 

14 4 10 3.7 19-25.6 155-50.6 5.0 2.4 13 112 18.0 0.22 1.8 

14 11 12 54.9 19-19.4 155-14.1 4.6 1.0 17 168 4.9 0.12 0.8 

15 3 7 16.8 18-44.0 155-17.2 8.0* 2.5 16 278 48.5 0.78 5.0 

.. .. .'
• • ,

SUMMARY OF SEISMIC EVENTS (CONTINUEO)

1912 HR MN SEC lAT N LONG DEPTH MAG NO GAP DMIN ERr ERH 

FEB 15 3 18 4.5 18-41.1 155-17.6 8.0* 2.2 15 ·284 51.1 0.98 6.2 

15 16 o 25.4 19-18.8 155-15.5 9.3 2.1 15 148 4.2 0.01 0.5 

15 16 '36 35.8 18-52.0 155-16.9 2.8 2.1 12 262 31.6 1.21 2.8 

15 22 11 4.5 19-24.4 155-25.7 5.5 1.5 13 169 8.8 0.12 0.7 

15 23 2 0.9 19-20.1 155- 1.1 8.0* 1.5 13 161 6.1 0.11 1.0 

16 2 51 59.4 19-18.9 155-13.9 8.0* 1.2 14 201 6.4 0.14 0.9 

16 3 52 31.6 19-20.0 1155-13.7 8.0* 1.0 12 156 5.9 0.08 0.6 

16 6 5 33.4 19-22.3 155-28.91 8.6 3.1 25 59 10.6 0.13 0.6 

16 11 14 42.9 18-49.1 155-19.21 28.4* 3.4 24 268 39.5 0.43 2.9 11 12 41 26.2 18-46.5 155-17.2 8.0* 2.8 11 278 46.0 0.66 4.2 

11 13 11 56.6 19-22.1 155-24.1 1.8 4.0 24 54 4.3 0.09 0.6 

11 1& 42 23.5 19-23.0 155-23.81 1.9 2.5 22 97 5.2 0.07 0.5 

w 17 18 35 0.1 19-22.6 155-25.8 4.8 1.3 11 53 6.3 0.01 0.6 

U1 11 20 29 50.9 19-23.0 155-24.1 6.2 2.3 18 99 5.7 0.08 0.6 

18 2 15 49.2 19-20.1 155-12.1 1.9 1.2 13 160 4.5 0.09 0.1 

18 4 28 47.2 18-48.6 155-19.61 30.1* 3.3 24 266 40.4 0.43 2.9 

18 4 34 18.6 18-45.8 155-19.0 34.2* 2.1 22 215 44.0 0.64 4.6 

18 9 52 21.4 20- 2.4 155-46.31 11.0 3.1 26 166 9.8 0.21 1.8 

19 7 23 51.2 19-20.0 155-16.2 7.0 1.3 19 137 2.2 0.08 0.1 

19 15 48 58.4 19-20.7 155..;10.3 8.6 1.5 13 155 2.1 0.10 0.8 

19 20 29 25.2 18-51.5 155-17.1 4.9 2.9 21 258 38.2 1.40 3.0 

20 o 43 43.8 19-22.2 155-25.1 7.6 .3.0 25 53 4.8 0.10 0.7 

20 3 6 41.6 19-21.8 155- 8.51 7.0 2.0 17 172 2.4 0.12 1.1 

20 8 36 11.8 19-19.1 155-13.4 8.2 1.5 19 150 6.4 0.05 0.4 

20 9 16 13.9 19-25.8 155-46.1 2.2* 2.6 17 301 40.5 0.51 3.4 

20 10 18 51.5 19-18.7 155-13.2 6.9 1.3 17 154 1.0 0.13 0.9 

20 10 40 0.9 19-17.1 155-49.8 8.3 2.6 25 126 5.3 0.11 1.1 

20 12 6 35.6 19-20.9 155-14.'0 27.1 1.6 21 133 3.7 0.12 0.8 

21 1 3 51.8 18-47.8 155-11.3 15.3* 3.9 21 268 44.1 0.30 2.0 

21 8 13 27.3 18-50.6 155-18.3 5.3 2.5 16 298 38.8 0.49 4.2 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERT ERH 

FEB 21 8 38 2.2 18-44.8 155-17.9 8.0* 2.7 21 282 46.7 0.65 4.l 

21 11 40 16.8 19-18.4 155-15.1 8.8 0.5 14 180 5.1 0.13 0.9 

21 13 26 1.1 18-58.8 155-17.9 12.6* 1.4 14 277 26.4 0.51 3.5 

21 14 34 26.8 19-19.4 155-13.5 8.0* 1.1 17 110 5.1 0.08 0.6 

21 11 33 33.6 19-19.2 155-11.8 8.0* 1.7 11 114 6.2 0.01 0.6 

22 17 38 54.4 19-20.2 155-13.9 26.4 2.2 20 137 5.3 0.12 0.8 

23 4 24 40.4 19-19.9 155-16.5 28.q 1.9 18 131 1.6 0.13 0.9 

23 5 8 9.9 19-20.0 155-10.8 5.1 2.1 16 142 4.2 0.12 0.9 

23 5 36 34.8 19-19.9 155-16.9 21.6 1.5 14 132 4.7 0.22 1.2 

23 17 6 11.2 19-19.4 155-15.1 1.3 1.1 18 143 4.3 0.06 0.6 

2'3 20 28 53.6 19-24.4 155-24.5 6.7 1.5 14 120 8.4 0.07 0.5, 

24 5 43 53.9 20- 0.5 155-51.61 43.0 2.3 13 211 15.1 0.41 1.9 

w 24 7 33 48.1 19-21.9 155- 6.4 8.0* 1.7 10 130 6.0 0.13 1.4 

0\ 24 12 45 36.4 19-20.5 155-13.1 5.8 1.1 13 181 6.0 0.14 1.0 

24 13 36 16.2 19-22.2 155- 5.61 0.0 2.0 15 120 6.3 8.07 l.5 1

24 17 22 51.8 19-21.q 155- 6.41 6.9 1.8 15 130 6.0 0.15 1.4 

24 11 43 21.3 19-22.1 155-12.4 4.8 1.6 14 131 4.4 0.08 0.6 

24 22 49 36.9 19- 1.7 155-41.9 34.3 3.9 25 179 6.3 0.26 1.4 

25 9 2 19.0 18-50.9 155-17.1 1.6 2.8 13 259 39.1 0.29 2.0 

25 16 58 41.0 19-20.0 155-15.4 27.8 2.3 20 138 3.5 0.15 1.1, 

25 22 7 52.8 18-48.4 155-18.5 0.9* 2.4 1'1 266 42.3 0.58 3.8 

26 2 o 55.2 19-10.4 155-35.5 5.1 2.2 14 103' 8.7 0.15 1.2 

27 1 2 20.4 19-20.7 155-13.9 21.1 2.2 '18 135 4.7 0.11 0.8 

21 17 54 5.2 19-22.7 155-23.4 5.9 1.4 14 64 4.6 0.08 0.7 

27 19 7 48.5 19-37.1 155-13.8 8.0* 2.0 15 135 21.4 0.06 0.6 

27 21 45 50.1 19-58.6 155- 9.4 58.5 12 229 38.3 0.66 2.8 27 21 '>3 16.0 19-20.3 155-19.6 5.9 1.0 11 94 3.9 0.07 0.6 

28 10 16 8.8 18-44.2 155-18.6 20.7* 3.0 11 283 46.3 0.40 2.1 

28 11 33 -j.6 19-18.2 155-17.3 6.3 1.9 19 146 2.3 0.12 0.9 

28 13 11 31.0 19-24.3 155-26.01 8.0* 1.8 14 70 9.0 0.24 2.0 

.. ...

" •
• t • ,

SUMMARY OF SEISMIC EVENTS (CONTINUED)

1912 HR HN SEC LAT N LONG W DEPTH MAG NO OMIN ERT ERH 

FEB 28 16 4 22.2 18-42.2 155-18.7 8.0* 2.8 14 290 52.9 1.23 7.1 

28 lq 2 27.5 19-26.6 154-54.1 4.1 2.0 13 215 4.4 0.17 1.3 

28 22 47 7.4 19-14.7 155-31.1 1.q 2.9 21 70 8.3 0.08 0.1 

29 4 21 28.6 19-21.4 155-15.8 25.1 2. 1 11 121 1.8 0.12 0.8 

29 12 8 24.5 19-21.7 156-20.4 19.1* 5.0 25 242 50.3 0.32 2.3 

2q 12 50 52.6 19-20.6 156-22.8 10.3 3.3 24 218 54.1 0.51 3.3 

29 18 13 58.1 19-24.9 155-26.1 4.4 1.6 23 61 10.9 0.10 0.1 

29 21 14 49.8 19-20.9 155-13.9 27.0 1.4 16 133 4.5 0.12 0.8 

29 21 40 50.3 19-23.0 155- 5.5 3.0 2.4 19 128 1.'3 0.12 0.8 

29 22 16 41.7 19-22.5 155- 9.2 5.4 1.0 '10 123 1.3 0.10 0.7 

MAR 1 3 30 18.7 19-21.1 156-26.3 8.0* 3.6 13 282 6,0.3 0.68 4.4 

1 4 15 11.0 19-19.2 155-15.1 6.8 1.1 11 190 4.3 0.10 0.1 

VJ 1 15 20 34.0 19-21.4 155--13.0 0.2 2.4 22 130 5.4 0.08 0.7 

"" 2 6 29 .35.8 18-52.2 155-11.0 3.6 2.5 20 256 37.1 1.28 2.1 

2 11 1 7.q 19-19.5 155-15.4 8.1 0.7 12 119 3.6 0.19 1.2 

2 19 57 46.0 18-42.5 155-21.1 8.0* 2.7 11 282 44.8 0.61 3.9 

3 2 32 56.4 19-1q.6 156- 3.9 25.5 3.6 13 271 21.4 0.21 1.4 

3 8 4 21.3 18-48.9 15'5-20.7 2.1* 2.6 16 278 38.5 0.51 3.2 

3 8 9 2.8 18-48.2 155-22.2 22.5* 3.9 16 286 36.9 0.62 4.2 

3 10 1 2.6 19-19.5 155- 8.9 7.0 1.1 12 114 5.1 0.15 1.3 

3 11 31 54.0 18-48.6 155-20.4 1.6 2.6 21 271 39.3 0.49 3.4 

3 Ii 49 21.1 lq-28.6 155-52.3 6.1 2.5 23 18·8 23.3 0.14 1.1 

4 16 78 34.4 19-19.4 155-15.4 7.2 1.1 16 180 3.7 0.10 0.7 

4 16 49 -40.6 19-25.9 155-25.3 8.0* 1.6 11 96 8.0 0.08 0'.1 

5 13 45 30.8 19-31.7 155-15.2 8.0* 1.2 10 202 12.2 0.32 2.2 

5 16 5 44.8 19-15.5 155-21.31 5.5 1.8 14 106 2.0 0.15 1.5 

5 17 14 54.9 19-54.5 155-21.8 34.9 2.8 24 153 12.7 0.25 1.2 

5 18 25 18.6 19-20.8 155- 6.4 8.0* 1.9 16 151 6.3 0.11 1.1 5 22 8 59.6 19-24.6 155-27.3 7.1 2.1 20 113 10.7 0.10 0.6 

6 1 34 1.4 19-46.8 155-47.0 11.9 2.1 15 152 11.8 0.15 1.4 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERT ERH 

MAR 6 1 36 13.6 18-45.7 155-19.5 8.0* 2.6 20 274 43.4 0.62 4.0 

6 7 21 56.6 19-23.2 155- 3.01 8.2 1.2 14 120 6.1 0.18 1.5 

6 10 34 15.4 19-17.9 155-23.6 1.5 1.5 14 117 4.3 1.32 0.8 

6 16 Sq 54.7 19-20.4 155- 8.4 7.8 1.6 15 143 3.9 0.10 . 0.9 

6 11 54 17.0 19-20.7 155-11.5 9.3 1.1 11 199 3.8 0.14 0.9 

6 18 49 52.3 19-21.2 155-11.6 7.0 1.9 19 134 3.0 0.08 0.8 

6 21 14 4.5 19-23.8 155-16.5 32.2' 1.3 11 95 1.1 0.29 1.3 

1 7 8 50.2 19-21.7 155-24.7 7.7 2.3 13 169 3.7 0.15 1.3 

1 1 ItO 3.8 19-19.q 155-12.1 9.2 12 209 4.9 0.14 0.9 

1 16 48 43.4 19-19.0 155-13.2 8.0* 1.1 12 212 7.6 0.15 1.0 

7 18 7 6.0 18-45.5 155-20.4 8.0* 2.7 14 275 42.3 0.43 2.8 

8 0 1 7.8 18-45.4 155-19.9 8.0* 3.1 21 215 43.1 0.57 3.6 

w 8 1 53 1'>.0 19-19.2 155-15.4 1.4 1.8 19 166 3.9 0.09 0.7 

00 8 1 54 45.1 19-19.3 155-15.6 8.8 1.6 13 118 3.4 0.15 1.1 

8 b 25 6.1 18-56.1 155-17.0 9.7 1.6 12 248 31.2 0.64 3.3 

8 1 11 26.7 18-43.3 155-19.1 6.7 3.2 20 280 46.6 0.42 4.5 

8 7 45 8.9 18-48.8 1.9* 2.3 17 261 36.5 0.56 3.6 

8 <) 8 25.8 19-20.0 155-10.6 6.7 1.7 19 146 3.9 0.11 0.9 

8 16 50 11.6 13-43.4 155-20.4 11 .6 2.a 16 281 44.8 0.31 2.8 

8 19 3 1.6 lQ-Sl.5 155-36.4 23.0 2.6 25 114 21.9 0.19 1.1 

8 21 6 27.6 19-25.1 155-22.1 7.0 1.6 17 140 4.9 0.10 0.8 

8 21 27 50.0 19-2.3.0 155-26.9 3.6 1. 3 14 141 8.2 0.15 1.0 

8 23 52 12.8 19-17.8 155-22.2 6.1 1. 1 . 17 134 4.8 0.11 1.0 

q 3 11 51.6 18-48.1 155-20.4 29.4* 3.5 24 268 39.1 0.47 3.3 

9 3 38 50.3 18-47.9 155-19.9 1..3* 2.9 19 268 40.1 0.51 3.6 

q G 13 45.1 18-44.6 155-18.7 8.0* 2.4 18 282 45.7 0.87 5.5 

9 '9 9 58.4 1q- 8.1 11)5-14.4 36.5 1.4 17 206 lq.5 0.33 2.3 

q 15 53 20.9 18-50.4 155-19.5 8.5 2.0 14 261 38.1 0.41 2.6 

9 2l 53 lei.l 19-17-4 155-13.7 5.8 2.2 19 174 9.6 0.17 1.0 

10 3 13 2.2 19-16.9 155-50.9 10.5 3.9 22 110 3.0 0.11 1.2 

.. , fI . ,
f , •

OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT f\j LONG W DEPTH MAG NO GAP DMIN ERT ERH 

MAR 10 4 11 56.0 18-41.6 155-19.3 8.0* 2.6 14 283 48.3 0.11 4.9 

10 6 11 17.2 19-22.1 155- 8.5 5.0 1.5 16 133 2.3 0.11 1.0 

10 8 8 52.4 19-20.4 154-57.6 29.1 2.0 10 294 21.1 1.02 5.3 

10 14 26 35.1 19-19.8 155-17.2 6.0 0.7 13 165 0.6 0.10 0.8 

10 16 5 33.7 18-52.1 155-18.6 8.2 2.7 17 261 36.1 0.41 2.5 

10 10 13 16.3 19-22.6 155-22.8 6.0 1.3 12 158 4.5 0.12 0.8 

10 18 16 10.2 19-56.1 155-27.1 28.8 2.0 16 169 13.3 0.19 1.4 

11 2 48 41.8 19-46.7 155-48.1 13.6* 2.2 13 248 35.9 0.36 2.5 

11 8 2 31.3 19-19.8 155-45.51 6.4 2.6 12 184 13.1 0.31 2.9 

11 8 25 42.6 19-19.2 155-15.6 8.0 1.3 17 185 3.6 0.11 0.8 

11 8 47 31.5 19-24.5 155-23.4 3.2 1.2 13 165 6.7 0.16 1.0 

11 10 0 1.7 20- 7.1 155-52.5 30.3 2.5 11 263 10.0 0.92 4.1 

w 11 21 24 18.5 19-24.8 155-23.4 1.8 1.6 18 98 6.7 0.09 0.1 

\0 12 5 51 19.9 19- 9.0 155-39.4 4.1 2.3 19 159 11.6 0.16 1.2 

12 8 40 38.5 lq-19.4 155-16.1 7.3 1.4 19 142 2.7 0.10 0.8 

12 9 32 55.3 19-20.7 155-13.8 6.1 1.1 13 111 4.9 0.15 1.0 

12 10 &>5 55.5 19-26.6 155-24.6 2.7 1. 1 10 199 6.2 0.14 0.8 

12 12 l6 28.6 19-20.9 155-11.1 7.4 1.4 15 136 3.8 0.10 1.0 

12 11 4 39.8 19-20.8 155-14.1 6'.4 1. 8 18 151 4.4 0.10 0.8 

12 18 19 25.1 19-1q.5 155- 8.6 3.4 1.1 11 174 5.3 0.17 1.1 

12 19 58 48.2 18-41.3 155-20.0 8.0* 3.1 24 285 41.7 0.57 3.6 

12 7030 '3.4 18-12.7 155-20.1 8.0* 2.0 14 334105.6 9.85 58.0 

12 20 51 16.5 19-54.q 155-33.3 32.6* 2.0 12 272 18.0 0.18 1.6 

12 2l 14 8.3 lq-18.9 155-25.2 5.6 1.3 10 141 4.2 0.14 1.4 

12 23 29 59.4 lq-18.5 155-15.9 6.1 1.3 14 200 4.9 0.15 0.9 

12 2.3 37 56.3 19-20.7 155-13.9 6.0 0.8 10 169 4-.7 0.22 1.5 

13 2 16 14., 19-20.8 155-12.3 5.9 2.2 23 164 3.1 0.14 1.0 

13 2 34 45.8 19-18.9 155- 8.l? 0.0 2.2 21 208 6.6 5.18 1.3 

13 4 47 10.6 lq- q.2 155-30.0 26.4 1.8 14 111 16.2 0.27 1.6 

13 9 48 36.5 19-26.4 155-26.6 7.2 1.0 19 110 8.5 0.12 0.8 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1912 HR MN SEC LAT N LONG W OEPTH MAG NO GAP OHIN ERT ERH E

MAR 13 20 16 58.8 19-19.3 155- 8.6 8.0* 1.9 16 178 5.5 0.11 0.9 

13 21 48 1.2 19-19.8 155-14.0 6.5 1.1 19 167 5.9 0.12 0.8 0

13 22 22 1.0 19-18.8 155-13.6 8.0. 1.0 10 213 7.1 0.17 1.2 

13 23 24 52.4 19-19.5 155-14.0 8.0* 0.8 14 181 6.0 0.11 0.9 

14 o 42 34.4 19-12.4 155-21.5 6.2 2.2 20 126 5.4 0.11 1.0 0

14 2 10 55.1 18-49.7 155-18.1 1.6* 2.5 16 271 39.9 0.77 4.8 

14 8 54 29.9 19-19.9 155-17.7 28.7 2.2 11 116 0.6 0.20 1.0 1

14 11 8 58.9 1q-41.4 155-40.9 13.6* 2.8 24 110 20.0 0.08 0.8 14 11 45 25.1 19-18.8 155-13.61 8.0* 1.3 10 213 1.0 0.21 1.9 

14 16 43 32.8 19- 5.0 155-22.0 26.9 2.0 22 199 13.3 0.25 1.5 2

14 17 13 0.8 1q-18.1 155-15.6 5.9 2.1 19 111 4.9 0.15 1.0 0

14 19 12 15.8 19-20.8 155- 1.2 3.9 1.6 15 153 5.2 0.16 1.3 1

0 14 22 13 6.4 19-19.1 155- 8.6 1.4 2.0 21 119 5.8 1.34 1.0 4

14 23 18 44. 2 ' 19-19.4 155- 8.7 6.1 2.3 22 115 5.3 0.16 1.1 0

15 9 48 43.3 19-20.0 155-12.9 5.1 1.1 18 142 6.5 0.10 0.8 0

15 11 30 57.1 19-21.1 155-24.31 1.3 1.2 14 112 3.3 0.12 0.9 0

15 11 48 10.2 19-18.7 155-15.0? 9.1 1.0 14 201 4.9 0.14 0.9 1

15 12 22 23.9 19-22.3 155-26.11 0.0 1.8 11 116 7.1 0.57 1.1 20

15 18 53 41.2 19-51.9 155-33.3 30.1 2.1 16 158 31.3 0.22 1.2 3

15 19 11 37.8 18-50.5 155-19.4 7.6 2.4 11 216 38.1 2.13 5.6 14

16 1 31 21.4 18-53.1 155-11.1 9.0 2.8 24 252 35.1 0.32 1.1 2

16 3 1 27.5 19-19.8 155-15.1? 2.0 1.1 15 111 4.1 0.25 1.4 1

16 5 1 14.9 19-23.6 155-23 •.11 1.1 1.4 1& 95 5.9 0.06 0.6 1

16 5 22 43.3 19-23.3 155-23.6 5.1 16 114 5.1 0.01 0.6 0

16 5 48 30.9 19-19.3 155-15.6 9.2 2.0 15 183 3.5 0.10 0.7 

16 q 2 11.1 18-54.3 155-13.1 2 2.1 14 259 38.1 0.10 3.4 3

16 13 12 1.8 19-11.5 155-32.41 3.2 2.1 15 98 8.8 0.20 1.4 1

16 17 30 45.1 19-21.0 155-24.3 5.5 1.2 14 141 2.3 0.09 0.1 0

16 23 24 38.7 19-11.0 155-18.0 30.7 1.4 14 183 5.8 0.32 2.1 3

17 3 46 16.3 19-22.3 155-23.1 6.1 1.2 18 109 3.9 0.08 0.6 0

II

..

• ,
t , ,

SUMMARY OF SEISMIC EVENTS (CONTINUEDI

1972 HR HN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH 

MAR 11 4 37 55.9 18-48.8 155-18.0 5.8 2.3 16 266 41.9 1.50 3.3 

11 5 48 19.0 19-19.9 155-11.9 28.0 2.4 27 110 0.9 0.12 0.8 

11 21 19 2.1 19-18.8 155-15.31 9.3 0.7 14 199 4.5 0.20 1.2 

18 8 8 51.3 1 9-1 5. 1 155-3 3,. 7 1.3 2.5 21 72 12.3 0.71 1.0 

18 q 45 40.1 19-20.4 155-25.6 7.9 2.3 23 81 4.1 0.07 0.8 

18 11 Its 27.2 19-25.1 155-23.9 3.1 0.6 16 135 7.2 0.14 0.9 

18 15 6 57.9 19-19.8 155-15.5 7.4 2.0 19 162 3.4 0.10 0.8 

18 16 9 21.9 19-20.3 155-11.3 9.0 0.6 12 212 4.2 0.13 0.8 

18 18 o 33.2 19-20.2 155-12.4 8.0. 1.1 13 191 5.6 0.08 0.6 

18 18 44 36.1 19-22.2 155-12.2 0.9 7 141 0.9 0.10 0.6 

18 19 11 36.1 19--21.2 155-12.1 0.0 1.5 11 114 2.5 0.85 1.2 

18 19 28 1.0 19-21.9 155-12.0 1.8 1.2 12 153 1.5 0.17 0.1 

..... 18 19 32 24.6 19-22.6 155-12.2 1.3 7' 146 0.8 0.01 0.5 

18 19, 34 5.0 19-21.9 155-11.9 1.1 0.3 8 152 1.1 0.14 0.7 

18 19 36 54.0 19-22.2 155-12.5 1.5 6 153 0.5 0.11 0.1 18 19 39 11.5 19-22.1 155-12.1 1.4 7 146 1.2 0.06 0.4 

18 19 41 4.3 19-22.2 155-12.3 1.2 -0.0 8 142 0.8 0.10 0.6 

18 19 49 53.4 19-21.9 155-12.2 1.1 1.6 11 154 4.1 0.20 0.8 

18 19 52 13.0 lq-21.7 155-12.81 0.3 0.6 10 154 1.4 2.84 1.0 

18 20 7 47.1 19-21.6 155-12.a 0.5 1.1 9 151 1.6 0.41 0.9 

19 7 3 52.2 19-10.0 155-14.6 40.2 1.1 21 198 16.3 0.28 1.6 

19 8 15 24.1 19-20.1 155-15.91 8.8 1.1 11 146 2.9 0.14 1.1 

19 13 6 45.8 19-19.1 155-11.6 10.4 1.2 13 168 5.4 0.11 0.1 

19 13 51 3.2 19-18.8 155-10.3 8.0* 1.6 13 196 6.1 0.10 0.8 19 14 39 7.1 19-23.1 155-23.9 7.3 2.2 18 115 5.5 ·0.10 0.8 

20 2 o 26.9 19-18.6 155- 6.6 0.0 2.5 11 196 8.6 0.58 1.0 

20 q 32 20.6 19-22.9 155-24.3 5.9 1.9 19 98 5.2 0.08 0.7 

20 9 56 21.4 19-13.9 155-23.5 6.2 2.2 11 151 7.3 0.11 1.0 

20 12 22 9.4 19-19.1 154-56.1 35.5 2.1 14 283 10.8 0.24 1.6 

20 14 32 26.1 19-20.3 155-12.0 1.0 3.0 21 141 5.0 0.09 0.8 
SUMMARY OF SEISMIC EVENTS (CONTINUEDJ

1912 HR MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERr ERH E

MAR 20 14 49 45.1 19-19.8 155-11.8 8.0* 0.1 11 164 8.6 0.10 0.8 

20 15 18 48.6 19-24.2 15'5-24.4 4.1 1.,3 13 181 7.1 0.14 0.9 20 18 14 51.9 19-22.0 155-22.9' 6.2 1.1 13 149 3.4 0.12 1.0 0

20 18 56 3.0 19-20.6 155-13.11 8.1 1.3 16 149 5.9 0.08 0.7 0

21 9 31 14.1 19-30.9 155-42.31 2.9 2.0 14 111 23.8 0.30 1.3 

21 16 27 51.4 19- 8.5 156- 8.1 10.6 2.0 12 313 52.5 0.36 4.1 6

21 21 32 50.6 19-22.6 155-23.1 1.5 1.8 19 93 4.4 0.06 0.6 0

21 23 7 29.1 19-19.1 .155-10.9 8.0. 0.6 14 171 5.7 0.12 1.0 

22 5 32 6.3 1<)-20.4 155-13.8 9.3 1.3 13 165 5.2 0.08 0.7 

22 1 33 11.3 18-47.2 155-16.7 8.0* 2.0 18 216 45.5 0.85 5.4 

22 q 10 24.0 155-21.1' 9.0 1.2 12 271 36.3 0.69 3.8 

22 16 12 36.9 19-19.3 155-16.4 1.9 1.4 13 190 2.4 0.12 1.0 0

22 11 2 19.9 19-17.3 155-13.91 7.0 1.2 10 227 8.1 0.66 3.3 

22 19 29 21.0 lq-19.7 155-15.9 1.2 1.1 16 141 2.8 0.14 1.0 0

23 2 18 59.9 19-19.1 155-' 7.71 1.8 2.0 23 189 6.1 0.22 1.1 

23 3 31 28.9 19-20.6 155-12.5 3.8 1.2 14 184 5.4 0.22 1.4 

23 5 29 20.1 19-18.1 155-21.4 5.1 1.2 11 129 5.0 0.13 1.0 0

23 10 51 11.5 19-19.1 155-12.5 8.0* 1.4 10 206 7.8 0.22 1.4 

23 15 13 11.2 19-19.8 155-15.1 9.2 2.3 11 195 4.1 0.12 0.1 

24 o· 35 54.2 19·-19.0 155-15.1 8.2 1.0 13 189 3.6 0.11 1.4 O

24 6 40 20.8 19-21.9 155-44.6 1.6 1.3 16, 126 25.8 0.11 0.9 

24 8 13 59.1 19--21.8 155-22.9 5 •.0 1.3 8 166 3'.0 0.'16 0.8 

24 12 23 45.8 '19-19.1 155-13.4 8.0* 1.1 6 208 7.2 0.22 1.9 

24 13 4 28.4 19-21.1 155-26.9 4.2 1.3 10 233 8.1. 0.18 0.9 0

24 13 20 57.4 19-19.8 155-13.1 1.1 2.3 16 181 6.9 ·0.09 0.6 

24 15 44 14.4 19-19.5 155-15.4 8.5 1.1 12 180 3.7 0.18 1.2 2

24 15 41 6.2 19-24.9 155-23.6 4.8 0.9 10 188 1.2 0.15 1.0 

24 19 20 37.9 19-18.2 155-15.2 6.9 2.4 22 152 5.2 0.12 0.9 0

24 19 21 1.4 19-23.1 155- 2.71 2.1 1.5 17 127 5.9 0.15 1.0 

24 20 17 31.8 19-22.6 155-23.2 5.3 1.1 10 1'68 4.5 0.16 1.1 

• • t# •
, .. , •

SUMMARY OF SEISMIC EVENTS (CONTINUED)

1912 HR MN SEC lAT N LONG W DEPTH MAG NO GAP OMIN ERT ERH 

MAR 24 20 38 13.9 19-25.615-5-26.9 1.6 1.6 22 110 9.9 0.11 0.7 

24 21 40 38.8 19-20.5 155-11.21 4.6 1.0 13 187 3.7 0.26 1.1 

25 o 59 51.1 18-52.9 155-18.7 8.2 2.3 14 265 34.6 0.71 4.1 

25 3 35 6.9 19-16.6 155-22.3 8.0* 1.1 'II 200 6.9 0.24 1.8 

25 3 56 54.0 19-17.4 155-21.a 2.9 1.0 15 136 5.6 0.10 0.1 

25 6 45 34.4 19-20.1 155-12.8 7.2 '. 1.2 16 l80 5.7 0.8 

25 1 25 24.3 19-19.i 155-17.0 29.4 1.0 18 160 1.9 0.24 1.5 

25 10 37 18.4 20- 0.8 155-32.1 41.0 2.1 .26 187 24.3 0.30 1.3 

25 11 40 59.9 19-16.3 155-23.3 2.2 0.9 11 134 6.0 0.09 0.1 

25 22 9 0.5 18-51.8 155-17.1 4.1 3.5 24 251 31.1 1.23 2.5 

25 23 51 20.1 155-11".4 8.0* 0.8 15 182 11..5 0.12 1.0 

26 o ,31 41.5 18-59.2 155-11.51 8.2 1.5 15 259 26.3 0.11 4.3 

w 26 2 11 54.0 19-20.3 155- 8.1 8.0 0.3 10 235 4.6 0.36 2.5 

26 3 10 47.8 lq-19.4 155-15.9 6.4 .' 0.1 11 116 2.9 0.15 1.0 

26 6 28 18.8 19-22.4 155-22.8 5.4 0.6 8 163 4.2 0.27 0.8 

26 6 54 31.4 19-15.2 155-28.0 8.8 1.4 16 142 3.2 0.08 1.0 

26 10 58 49.4 19-22.6 155-27.3 8.0* 9 158 8.4 0.23 1.9 

26 11 23 25.9 18-50.8 155-19.6 8.1 2.5 14 264 31.5 0.49 2.9 

26 13 34 22.2 18-48.1 155-17.5 8.0* 2.4 15 280 44.2 0.65 4.2 

26 14 54 41.5 18-52.9 155-18.3 8.5 2.1 12 253 39.5 0.43 4.8 

26 ,214315.8 19-21.5 155-11.0 21.0 10 148 2.5 0.42 2.1 

26 22 12 6.0 19-20.6 155-15.1 31.4 12 150 3.1 0.31 1.8 

27 o .59 6.9 19-20.6 155-10.8 5.2 2.2 13 220 3'.2 0.23 1.4 

21 2 22 25.7 19-19.4 155-11.6 28.6 2.3 13 145 1:4 0.21 1.3 

27 '" 11 4.1 19-21.8 155-27.9 0.1* 11 129 8.5 0.15 1.0 

21 5 50 3.1 19-26.6 155-24.3 2.5 10 195 6.2 0.20 1.0 

21 6 1 1.4 21- 1.7 156-15.3 38.1* 4.1 13 321 29.0 0.49 3.9 

21 q 56 35.8 19-19.4 155-12.5 2.1 2.1 21 149 5.6 0.15 0.9 

21 11 18 13.7 19-19.1 155- 8.0? 4.6 1.3 15 181 6.4 3.81 1.5 27 12 SO 25.5 19-18.9 155- 1.6 8.0* 1.2 10 188 1.1 0.21 2.5 
SUMMARY OF SEISMIC EVENTS (CONTINUEO)

1972 HR MN SEC lAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH E

MAR 27 14 31 23.5 19-18.1 155-12.5 2.3 23 150 6.9 0.34 0.8 1

27 15 6 14.0 19-20.5 155- 6.8 8.0* 1.5 1 159 6.1 0.08 1.1 

27 16 24 11.8 19-10.8 155-21.0 32.0 1.9 13 238 18.5 0.60 2.8 4

21 17 . 0 8.2 19-19.6 155-11.5 5.4 1.0 14 168 5.4 0.16 1.1 127 22 47 51.9 lq- 4.1 155- 8.11 15.3* 1.9 20 241 29.4 0.37 2.8 

28 0 6 53.4 19-18.5 155-13.4 8.0* 1.2 9 220 1.6 0.15 1.0 

28 4 23 15.2 19-20.5 155-13.61 2.2 1.0 11 176 5.3 0.60 1.3 1

28 6 4 6.2 19-11.5 155-21.9 8.0* 1.3 8 168 18.0 0.20 3.1 

28 6 29 14.1 19-22.9 155-24.4 8.0* 0.9 8 208 5.4 0.15 1.0 

28 7 10 15.2 19-20.5 155-13.0 8.0* 0.1 12 183 6.2 0.11 0.8 

28 7 15 58.6 19-20.5 155-12.0 8.0* 1.2 8 196 4.1 0.12 1.0 28 1 28 32.6 19-24.9 155-16.5 13.3 1.1 14 103 0.8 0.05 0.5 0

28 12 27 51.7 19-19.9 155-11.6 8.0* 1.1 12 164 5.0 0.09 0.8 

28 23 18 35.9 19-19.7 155-13.8 3.1 1.4 19 165 6.1 0.19 1.1 1

28 23 18 46.9 18-53.7 156-36.8 3.0 3.2 20 325100.2 0.25 10.5 11

29 0 2 14.9 lq-22.1 155-10.2 5.4 1.2 13 144 0.6 0.15 1.1 1

29 1 20 27.1 18-52.2 155-10.91 5.4* 1.9 11 269 49.5 0.30 2.1 

29 3 18 44.6 19-23.5 155-15.3 1.6 1.0 8 170 2.4 0.08 0.4 0

29 .3 44 26.3 19-18.8 155-12.7 8.0* 1.2 13 178 1.8 0.10 0.7 

29 4 o 51.3 19-11.6 155-13.9 8.0* 1.2 12 233 1.6 0.23 1.3 

29 4 47 44.9 19-19.0 155- 8.5 8.0* 1.4 12 286 6.2 0.95 4.9 

29 6 21 25.1 19-22.9 155-14.5 0.0 0.8 11 119 2.6 0.28 0.4 0

29 8 21 56.8 19-21.6 155-24.8 7.8 1.6 18 96 3.6 0.13 0.9 0

29 9 14 48.1 lq-26.6 155-21.3 4.8 2.0 10 231 9.2 0.33 1.1 1

29 9 16 2.1 19-28.8 155-29.1 8.0* 2.0 7 304 11.4 0.61 3.2 

29 9 16 13.4 19-21.1 155-26.3 7.4 2.2 20 10 1.3 0.10 0.1 0

29 9 46 38.0 19-19.q 155-15.1 7.3 1.5 16 150 4.1 0.10 0.8 0

29 10 12 19.1 19-27.9 155-26.9 7.6 1.1 14 110 7.2 0.13 0.9 0

29 10 20 29.1 19-26.7 155-30.0 8.0* 1.8 7 295 13.1 0.89 4.6 

29 13 43 23.1 19- 4.8 155-22.2 12.6* 1.6 16 201 25.1 0.18 1.1 

• ., ..
tt# 4 •

SUMMARY OF SEISMIC EVENTS CCONTINUED)

1972 HR MN SEC LAT N LONG '" DEPTH MAG NO GAP OMIN ERr ERH 

MAR 29 14 35 57.6 19-19.4 155-15.6 6.3 1.0 12 119 3.4 0.14 0.9 

29 15 58 9.8 19-45.9 155-29.31 7.0 2.0 20 215 20.6 0.33 3.2 

29 16 41 4.1 19-19.9 155-15.6 8.6 1.4 12 168 3.2 0.16 1.0 

29 19 23 4.1 19-26.5 155-25.7 5.5 16 235 1.1t 0.29 1.4 

29 19 55 59.0 19- 0.9 155-14.3 47.0 2.1 23 230 32.4 0.37 1.9 

29 20 5 38.8 19-11.8 155-14.4 44.5 1.9 16 189 13.7 0.42 2.0 

29 20 59 18.7 18-59.4 155-13.8 14.1* 17 236 38.7 0.35 2.5 

30 0 6 40.4 19-20.8 155- 7.8 7.4 1.1t 16 152 4.3 0.13 1.3 

30 1 L5 5.7 18-46.9 155-14.2 8.0* 2.4 17 283 50.2 1.03 6.7 

30 1 29 58.0 18-54.1 155-19.9 8.8 3.0 14 248 36.2 0.21 2.6 

30 1 32 46.6 18-46.6 155-15.6 8.'0* 2.6 16 272 48.5 0.76 5.0 

30 1 48 18.3 18-43.6 155-11.3 8.0* 2.7 14 290 48.1 0.93 6.0 

30 1 49 51.4 19-23.3 155-23.1 7.9 2.4 19 54 5.1 0.05 0.5 

.- U1

30 1 58 40.2 18-48.3 155-18.0 8.0* 3.1 19 321 54.1 0.36 2.4 

30 2 1 9.5 18-51.3 155-20.4 18.2* 2.1 9 214 36.9 0.60 4.2 

30" 2 .8 10.4 18-48.9.155-.20.4 12.9*. : 13' 2813'8.9' 0:.86 5.1 

-30 2 13 " 18-50.9 1'7.3.·,2:.5 13: 212 35.5 0-.35 2.3 

: 30 2' 11 21.3 7. 155-16,.9 ,,8.0*.2.3 . 15 218 ·44.1 0.65 4.4 

'30 2 40 18-48.7 155-16.7 8.0* 2.8 19 266 44.9 0.46 3.0 

30 3 1 40.2 18-41.4 155-16.• 8 8.0* 2.1t 18 281 0.67 

30 3 52 45.4 18-48.9 155-11.9 8.0* 2.7 19 266 42.8 0.,.9 . 3.2 

30 4 37 21.2 19-17.8 155-27.5 6.4 1.6 13 112 2.8 0.10 1.1 

30 4 51 9.1 19-12.0 8.0* 1.5 13 228 8.2 0.26 1.8 

30 5 43 34.0 19-20.3 155-13.2 8.0* 0.9 11 152 6.0 0.07 0.7 

30 1 12 18.9 19-20.6 155-11.2 9.0 1.1 8 207 3.6 0.11 0.8 

30 7 31 35.6 18-51.2 155-11.31 2.1* 2.6 15 264 42.2 0.44 2.9 

30 8 53 48.3 18-48.1 155-11.9 8.0* 2.6 11 273 43.5 0.61 4.0 

30 9 30 44.4 18-49.3 155-18.1 8.0* 2.4 15 210 42.2 0.67 4.5 

30 14 1 15.3 19-17.7 155-23.81 0.8 1.3 14 132 4.7 1.68 0.7 

30 14 2 49.9 18-55.1 155-30.5 20.9 3.9 23 246 11.9 0.41 2.4 
••

SUM"ARY OF SEISMIC EVENTS

1972 HR .... SEC LAY M LONG W DEPTH MAG NO GAP ERr ERH E

MAR 10 19 lit 1.3 19-19.S 155-10•. 2 9.3 1.• 1 12 172 4.7 0.08 0.6 i

30 21 40 11.1 19-20.9 155-12.91 7.9 2.0 18 146 2.9 0.06 Q.6 0

31 2 S5 59.9 19-18. 7 1 t55-·1). J 8.0. 1.0 10 215 7.0 0.21 

11 5 lS 41.4 19-19.3 155-16.4 6.2 1.4· 17 150 2.2 0.11 0.9 0

31 16 )4.9 19-20.8 155- 5.6 6·.1 4.1 20 141 5.0 0.10 0.8 0

31. 18 19 2.;.3 19-20.0 155- 5.1 ).1 1.1 is 2fJ9 9.2 0.29 1.8 

Ii 18 59.9 19-22.) 155-ZS.1 1.0. 1.1 11 116 s.o 0.07 0.6 

)1 Ie 'i158.8 19-22.9 6.1 4.t J.l 18 114 6.5 0.11 1.1 

31 '1 10 Z2.Z 19-41.4 27.6. l.O 11 140 11.0 0.98 6.6 

• t(

Ia
Table 3. Felt earthquakes

Date Titne MU/.rTli tude ~'olt report

II M ('

H

Jan 9 19 00 43.1 2.6 Hawaii National Park

13 13 59 32.2 4.3 Kapapa1a

16 18 25 59.4 1.9 Kapapala

17 08 04 13.1 2.9 Kapapala

21 01 34 04.3 1.7 Hawaii National Park

23 19 23 16.7 2.1 Kapapala, South Kona

Feb 2 05 53 31.0 3.3 Kapapala, Hawaii National

Park, Kealakekua

10 03 13 06.9 2.7 Kainaliu

16 06 05 33.4 3.1 Kapapala

• 16 11 14 42.9 3.4 }{apapala

17 13 17 56.6 4.0 Kapapala, Hilo, Volcano,

Honokaa

18 09 52 27.4 3.1 Kamuela

21 01 03 51.8 3.9 Kapapala

24- 22 49 36.9 3.9 Kainaliu, Captain Cook,

Kealakekua

28 22 47 07.4 2.9 Kapapala

29 12 08 24.5 5.0 Kainaliu, Captain Cook,

Kapapala, Island of Oahu

Mar 3 08 09 02.8 3.9 Captain Cook, Kapapala

9 03 11 51.6 3.5 Kapapala

10 03 13 02.2 3.9 Milolii, Captain Cook,

Kainaliu, South Kona

Zl 06 01 01.4 4.1 Island of Maui

30 14 02· .49.9 3.9 Kainaliu, Naalehu, Volcano,

Captain Cook

31 16 20 34.9 4.1 Volcano, Glenwood, Hila,

Papaikou, Kalapana

•

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Figure 1.--Plot of epicenters in the Kilauea region. Triangles are

seismometer locations. Kilauea Caldera and the major pit craters

on the east rift are shown in outline. The Pacific Ocean lies in

the lower right -portion of the illustration.

48
Table 4. Seismometer stations in Hawaii operated by the U. S. Geological Survey.

STATION NAME

AHUA

CONE PEAK

DESERT

ESCAPE ROAD

HALE POHAKU

HILINA PALl

HUALALAI

.. KAAPUNA

KAHUKU

KAPAPALA RANCH

• KEANAKOLU ..

KIPUKA NENE

KOHALA

MAUNA LOA

MAUNA LOA X

MAKAOPUHI

MOKUAWEOWEO

MOUNTAIN VIEW

NORTH PIT

OUTLET

PUU HULUHULU

PUU HONUAULA

PUU PILI

SOUTH POINT

WAHAULA

WALDRON LEDGE

CODE LAT-N LONG-W ELEV TYPE CAL VCO RADIO REMARKS

kHU 19 22.40 155 15.90 1070 3 6.0 2380

CPK 19 23.70 155 19.70 1038 3 1.34

DES 19 20.20 155 23.30 815 3 1.34

ESR 19 24.68 155 14.33 1177 3

HPU 19 46.85 155 27.50 3396 1 5.6 1360 RF6

HL~ <~,:917. 96- 155 18.63 707' 3 6.0 2'040

"HUA 19"41.25 155 50.32 2189 'I 5.2 '1700 RF4

KAA 19 15.98 155 52.28 524 1 5.5 1020 RF12 Installed 1/4/72

KHU 19 14.90 155 37.10 1939 1 5.7 1700 RF3

. KP:R 19. 16.40~~-l55 26.70 610 1 - 6.5 1700 RFI

KKU 19 53.39 155 20.58 1863 1 4.8 2380 RF7

KPN 19 20.10 155 17.40 924 3 1.34

KOH 20 7.69 155 46 •.77 1166 1 1.5 2380 RF2

MLO 19'29.80155 23.30 2010 1 6.5 1360

MLX 19 27.60 155 20.70 1475 3 1.34

MFR 19 22.07 155 9.85' 881 1 5.7 2720 RF5

MOK 19 ,29,.28,.15.5::'.3-5.98 4104-, 1 6.5 2040 RF3

MTV t9:~~~10.25·~~155 ~'3~~~75 '409::' 1 6.2 680 RF8

NPT 19 24.~O 1·55. 17.od~·JI15 -~ 1.34

OTL 19 23~j8 155 16.·94:··~·1~038 :3'·;·- 5.0 System 1 3/7-29/72

PHH 19 ;22 •.'45'15.5 .:f1. 66 '·"r9'8~8\. 3.

PHO -1·9 28"90 15,r 53.40 21'·5:~.~ ,I '; 6.5 2720 RF1

-PPL-19' 9,~~50;155 27.87 35 "'l...l ~: .4.4 1360 RFll

SPT~'~;18 5.8'.9.1 ,155, 3;9•.9224..4 '\.'.~..: -7:.8 2040 RF7

;,r WHA .19.-. 19~.90·-155 2.92' 29 ·1'(· ·:!:6~~.0 680 RF9 '~'. WLG 19 '25.49 155 15.69 1067 '.,' 3'.' "

OPTICAL SEISMOGRAPHS .':' . {. '~~".' ;.

HALEAKALA Z HAL 2'0 46~'o6 156 ..15. OO~~'2090

HALEAKALA EW RAE 20 46.00~.156· 15.00,,12090

HALEAKALA NS HAN 20 46.'00 156 15! 00 2090

HILO Z HIt 19 43.20 155 5.30 20

HILO EW HIE 19 43.20 155 5.30 20

• HILO NS BIN 19 43.20 155 5.30 20

KEALAKEKUA Z KLK 19 31~20 155 55.30 505

KEALAKEKUA EW KLE 19 31. 20 - 155 55. 30 .. 505

KEALAKEKUANS KLN '19 31. 20 155 55. 30 505

KIPAPA KIP 21 25.40 158 ''''90' 76'

UWEKAHUNA Z OWE 19 25.40.155 17.60 1240

UWEKAHUNA z· ..."" -~ ".. USZ .-.19··~ 25'. '40 155 i 1 60 1240

UWEKAHUNA EW USE 19 25.40 155 17.60 1240

UWEKAHUNA PEZ 19 25.40 155 17.60 1240

UWEKAHUNA PEE ,. '. ·19 25.40, 155 17.60'1240

UWEKAHUNA PEN ~'.; l 1,9 '25 .40 155' 17. 60 1240 .... ~. .

49

··..3

ot... o

3

o

o

2

. 2 .

2

-3

3

4

4

:f

~,~ ". :" ;:

;0'. 71 . 1."0' ..

; 1,~0

1,20

i~. 0'

1. 0" ",

1.0 '

0.34 . 0.34 ;',';

0.56

.Q.~7..

1.0

1.0

Wood-Anderson

Wood-Anderson

Wood-Anderson

Wood-Anderson

15-90 Press Ewing
Period (sec)

10 5 2 I 0.5 0.2 0.1

c

0

..

0

10 u 4

.---c:

0-

0

2

10 5

0.01 I

·Frequency

100 1000

Figure 2.--System response curves for the Wood-Anderson torsion

seismograph and for the four different types of seismometeramplifier (or galvanometer) combinations in use by the

Hawaiian Volcano Observatory.

so
f

•

Table 5.--Seismic Instrumentation Types

Type 1. ;Consists of:

a) EV-17 - Electrotech EV-17 1.,0 sec. period moving magnet

vertical component seismometer or horizontal

component adjusted for an output of 0.5 volts/cm/

sec and 0.8 critically damped.

b) Preamp/VCO - Develco Model 6202 voltage controlled oscillator

or a USGS/NCER Model JE202. 3 db points for bandpass

filter at 0.1 Hz and 30 Hz. Signals are transmitted

on audio FM carrier over cable or FM radio link to HVO.

Type 2. Consists of:

a) EV-17 - Electrotech EV-17 1.0 sec. period moving magnet

vertical or horizontal component seismometer.

b) 3.5 Hz galvanometer with appropriate shunt resistances for

critical damping. System is poorly calibrated.

Type 3. Consists of:

a) EV-I7 Electrotech EV-17 (as described above), Hall-Sears HS-IO

0.5 sec. period moving coil seismometer or Observatorybuilt 0.8 sec. period moving coil seismometer with

HVO-built solid state seismic preamplifier (voltage

gain, 200X) , direct signal transmission over cable to

HVO and HVO-built solid state amplifier and galvanometer

driver, or Observatory-built electromagnetic seismometer

with 2 Hz galvanometer. Peak magnification approximately

40,000 at 4 Hz •

Type 4. Consists of:

Sprengnether short period vertical and horizontal seismometers

(E-W) with 1.5 sec. galvanometers, coupling factor

0.25, 2X critically damped. Peak magnification

approximately 1500X at 2 Hz.

Experimental type amplifier systems are not given type numbers.

51
TILTING OF THE GROUND AROUND KILAUEA CALDERA

Tilting of the ground around the summit of Kilauea is monitored

daily by a short-base water-tube tiltmeter in the Uwekahuna Vault, and

at irregular intervals it is measured on a regional scale by means of

a network of field tilt-bases and a portable water-tube tiltmeter.

The attitude of the ground surface at each tilt-base is reported in

terms of north-south and east-west tilt coordinates. Both coordinates

at each station were arbitrarily set equal to 500 when measurements at

that· station were begun. Increasing tilt coordinates correspond to

northward and eastward tilting of the earth's surface; that is, to

a relative subsidence toward the north and east. A one-unit change

in coordinate corresponds to a tilting of 1 microradian (1 mm per km)

in the direction indicated.

Location of and essential data on each tiltmeter station are listed

in Table 7. The field tilt bases were not measured during this quarter.

Table 6.--Tilt Coordinates at Uwekahuna,

January, February, and March 1972

Date N-S E-W Date N-S E-W

Jan. 2 719 326 Mar. S 728 326

9 721 326 12 728 325

16 723 324 19 728 328

23 724 320 26 726 332

30 727 316

Feb. 6 730 316

13 729 319

20 729 318

27 729 319

52

•
Table 8. --u.s. Geological Survey water-tube tiltmeter

stations in Hawaii

Location Frequency Base

Station Symbol of length Description

Lat. N. Long. w. reading M

Deg. Min. Deg. Min.

Tree Molds TM 19 - 26.3 155 - 17.3 Quarterly 50.79 NS. and EW.

Sand Spit 55 19 - 24.1 155 - 16.8 ---do--- 25.40 Equilateral

triangle.

Keamoku Kea 19 - 25.1 155 - 19.0 ---do--- 47.55 do

Ahua

Kamokukolau Kam 19 - 22.7 155 - 16.6 ---do--- 50.79 do

Kipuka Nene KN 19 - 19.4 155 - 16.7 ---do--- 47.73 do

Hilina Pali HP 19 - 18.2 155 - 18.6 ---do--- 47.73 do

Kapapala

Ranch Kap 19 - 20.5 155 - 23.8 ---do--- 50.79 do

Mehana M 19 - 26.2 155 - 14.3 ---do--- 25.00 do

Uwekahuna U 19 - 25.5 155 - 17.4 ---do--- 50.79 do

Uwekahuna

Vault 19 - 25.4 155 - 17.6 Daily 3.48 NS. and EW.

53
REFERENCE CITED

Hamilton, R. M., B. E. Smith, J. C. Hall, and J. H. Healy, 1969,

Summary of seismic activity in the Pahute Mesa area, Nevada

Test Site, December 1968 - June 30, 1969: U. S. Atomic Energy

Comm. (USGS-474-58): Springfield, Va., Clearinghouse for

Federal Sci. and Tech. Inf., 63 p.

. .,

J

54 'tl GPO 692-114
UNITED STATES

DEPARTMENT OF THE INTERTOR

GEOLOGICAL SURVEY

HAWAIIAN VOLCANO OBSERVATORY

Sm-1MARY 66

April, May, and June 1972

By

Akira Yamamoto, John C. Forbes,

and Mau~ice K. Sako

Chronplogical Summary

f3y

Robert L. Christiansen

OBSERVATORY STAFF

f,eochemistry

R. L. Christiansen

\-1. A. Duffield

R. T. Holcomb

D. W. Peterson (Scientist-in-Charge)

Geophysics

K. T. Honma

George Kojima

R. Y. Koyanagi

A. T. Okamura

J. D. Unger

R. T. Okamura

J. C. Forbes

W. H. Francis

M. S. Onouye (Mrs.)

M. K. Sako

Akira Yarnarnato
CONTENTS

Chronological Summary..

Seismic Summary.... ·

Tilting of the ground around Kilauea Caldera .

Reference Cited. . . . • . .

Illustrations

Figure 1. Epicenter Map .

Page

1

3

40

43

36

2. Response curves for seismograph systems . 38

3. Tilting of the ground around Kilauea Caldera. .

Tables

Table 1. Number of earthquakes and minutes of tremor . .

2. Summary of seismic events .

3. List of felt earthquakes.

4. U. S. Geological Survey seismograph stations

in Hawaii . . . . . . . . . . . . . . • . . . .

5. Description of Seismic Instrumentation Types.

6. Tilt coordinates at Uwekahuna .

42

4

8

35

37

39

40

7. Tilt coordinates and changes at bases around

Kilauea Caldera . . . . . . . . . . . . 41
CHRONOLOGICAL SUMMARY'

The Mauna Ulu eruption that began in February continued through

the quarter. The level of activity at Mauna Ulu increased in early

April, and vents C and D at Alae, which had become dormant in late

March, resumed their activity on April 3. The lava lake at Alae

again became active, and a small shield built over vent D before it

declined and extinguished later in the month. The principal active

vents at the beginning of this renewed activity were A in the main

Mauna Ulu crater and C at Alae. Each fed an actively circulating

lava lake that showed short-period rise-and-fall cycles of the

"gas-piston" type that were described in the 1969-1971 Mauna Ulu

eruption. Vent A gradually disappeared as a source of fountaining.

New vents became active in the trench near the former vent B from

time to time and flooded the trench with flowing lava that cascaded

from the trench into the crater. Each of these vents seemed to be

a temporary manifestation of a continuing feeder in the vicinity

of vent B. Most of the flowage westward from the trench into the

crater was in a lava tube beneath a crusted surface in the trench

and through the septum between it and the main crater.

This pattern progressed to a stable configuration with the

level about the same in the trench and the crater, but with lava

visible in the trench only when holes collapsed in its generally

crusted roof. The lava lake in the crater remained at a more-orless constant level about 20-30 rn below the rim. No overflows

occurred from Mauna Ulu during the remainder of the life of this

stable eruptive pattern, but Alae overflowed almost constantly to

produce a growing shield with an active lava lake at its crest,

directly over the old crater.

The stability of this eruptive pattern was remarkable. The

volume of lava flowing westward from the trench to the crater of

Mauna Ulu varied slightly, as did the level of the lava lake in

the main crater. The rate of flow of vent C at Alae also varied

within rather small limits. Minor inflations and deflations caused

tilt changes of a few microradians at the summit of Kilauea. The

entire eruptive system seemed to be in a steady-state condition in

which inflow determined the output of a master feeder in the vicinity

of vent B in the Mauna lilu trench, the lava lake in the main crater

acted as a local reservoir, and overflow from Alae balanced total

inflow to the system.

During May some islands appeared in the Alae lava lake, similar

to "epimagma" islands described by Jaggar in Halemaurnau early in the

century. These islands grew and coalesced over a period of about a

month, separating the Alae lava lake into two main compartments. One

of these, fed directly by the vent, continued to build its levees and
to overplace its growing shield at a greater rate than the other,

which was fed by overflow from the first. Thus, the two segments

of the lava lake developed distinctly different levels. By the

end of the quarter, the Alae shield was more than 30 rn high above

the early 1972 surface, and its summit was more than 100 m above

the pre-l969 rim of Alae Crater. In late June overflows from Alae

once again, as in March of this year, cascaded into Makaopuhi Crater.

The deep western pit of Makaopuhi began to fill as this flow

continued into the next quarter.

2
SEISMIC SUMMARY

Events recorded by the U. S. Geological Survey seismograph network

in Hawaii fall into two categories:

1) Local earthquakes and tremor originating in the region of the

Hawaiian Islands (usually within 100 km of at least one

seismograph),

2) Distant earthquakes originating more than 3,000 km from Hawaii.

As an index of seismic activity at Hawaiian volcanoes, daily counts of

earthquakes and minutes of tremor recorded by seismographs in Hawaii

are listed in Table 1. The earthquakes are separated in groups on the

basis of region of origin as determined by the analysis of records

obtained daily at the Observatory (OWE, MLO, MLX, AHU, DES, NPT, WPT,

MPH, KMO, OTL).

Computer locations of well-recorded events are listed in Table 2.

The location of each seismograph station is listed in Table 4, along

with a description of the equipment at each station.

3
Table l.--Number of earthquakes and minutes of tremor recorded on seismographs arou

Tremor is separated into three categories: Deep, Intermediate, and Shallow, on the bas

amplitude on seismographs in the summit region. Unless otherwise stated, tremor i

be associated with movement of magma within the central complex of Kilauea Volcano

Earthquake categories are: Kilauea Summit 30 KM, earthquakes from a source about 30 km 

summit region; Kilauea Summit Long-Period, earthquakes characterized by low-freque

originate roughly 5 km beneath the summit region; Kilauea Summit Shallow, earthqua

deep in the caldera region; SW Rift and Kaoiki, earthquakes along the southwest ri

Kilauea and the adjacent portions of the Kaoiki fault system; Upper East Rift, eart

the upper east rift zone and the adjacent fault systems of Kilauea's south flank; 

quakes along the northeast-trending Koae fault system south of the caldera; Lower 

earthquakes from the lower east rift zone of Kilauea; Offshore Puu Pili, offshore 

mostly southeast of Puu Pili (PPL) station.
V'1

Tremor Earthquakes

(m

= minutes

Date

h

= hours) Kilauea Summit

(1972) SW Rift Upper Lower

Inter- Long and East East Offsh

Deep mediate Shallow 30 KM Period Shallow Kaoiki Rift Koae Rift Puu P

April 1 50 796 13 57 14 101 ,2 20 199? 13 22

4

4 4

3 89 188?

6 37 5 3 61

4 122 152? 10 20

9 22

5 1 69 467 46 44 20

4 12

6 . 26 251? 12 74 6 5 .c

7 .u 15 45 343 27 56 15

2 195

s=

8 9m Q) 0 13 45 394 20 67 13

4 37

.c

e

9 +J 4 4 282? 16 21 3 2 12 Q) 10 s=.c 10 12 221? 33 23

2 69 o .J

11

,... .u

4 ? 301? 27 49 3 1 157

12 o 1 28 614 11 30 6 52 s 0 13 Q)..!::

4 329? 17 54

4 11

bD 14 .u 32 614 11 64 15 20 0 15 Q) ,... 31 400? 15 47

5 10

+oJ..!::

16 t\S .u 1 1 ? 1 ? ?

,...

17 Q) .u 1 11 1311 14 31 11 23

18 17 334 18 79 28 3 54 s ,... 19

o +oJ 110 446 72 11

6 91

20 +oJ CJ) 19 429 71 42 12 10 C1j

21 ) OJ 1 38 352 42 30

7 1 25 0

22

2 54 348 30 13 11 1 16 OJ

23 72 353 48 76 16 3

24 1 2041 346 8? 53 5 1

25

7 56 327? 22 24 10 315

26 1 141 303 29 37

4 1 42

27 211 308 14 44 3 1

28 159m 134 457 11 23 8 1 38

29 60m 188 339 21 37

5 1 24

30 298 330 36 56

9

4 8
0'\

Tremor Earthquakes

(m

= minutes

Date

h

= hours) Kilauea Sunnnit

(1972) SW Rift Upper Lower

Inter- Long and East East Offsh

Deep mediate Shallow 30 KM Period Shallow Kaoiki Rift Koae Rift PUll P

May I 3 261 465 31 32 47

5 1

2 1 163 421 25 29 5 6 10

3 337 370 35 31

9

2 1

4 527 343 34 30 7 1

5 493? 363 27 17

6 1 6

6

3 230 316 29 21

3 3 158

7 169 294 17 33 2 I

8 163 239 16 24 5 5

9 . ,.....c:: 118 298 35 23

9

4

10 Q) .u Pt= 84 229 16 ? ? 6

11 ? PtO 50? 152? 35 37

3 ? =' f3

12 5m 20m Q) Q) 49 495

9 26 10

4

13 30m ..c..c:: .&-J .&-J 1 ' 66 466 19 17 8 3 3

14 = .&-J 1 239? 362 24 41 12

15

o =' 1 413 354 40 14 I 0 4

3

I 16 ,.....s::

o be

2 293 365 58 17 16 1

17

S ;j

Q) 0 91 392 48 15 24 I 18 ,... ,... .&-J..c:

2 232 403 35 27

7 1 1

19 .&-J

3 54 507 29 27 13

3

20 36m Q) .u >l+-f 1 85 453 32 23 19 1 8

21 104m Q)-M.... 135 413 33 15

5

22 ) .u 115 408 41 11

3

2 1

23

o en

C\1 1 60 306 46 23 15 1

24 Q) 162 273 19 17 10

2 325

25 45m ? 271 453 32 114 16

5 71

26 14m

4 110 375 10 52 12 1 38

27 30m 115 384 15 24

3 28

28 231 394 31 26 12 ?

29 136 415 51? 24 17 6 13

30 7m 70 683 20 39 12 1 9

31 23m 210 599 34 46 16 1 9
.........

Tremor Earthquakes

(m

= minutes

Date

h

= hours) Kilauea Sunnnit

(1972) SW Rift Upper Lower

Inter- Long and East East Offsh

Deep mediate Shallow 30 KM Period Shallow Kaoiki Rift Koae Rift Puu P

June 1 111 512 22 53

7 2 7

2 14m

2 134 662 42 80 15 3 8

3 1 97 577 62 65 9 11 10

4 26? 374? 6? 10? 14? 6

5 19 413 16 19 8 8

6 2m 11 453 26 23 12 1 17

7 . 1 22 491 12 28

7 ?

8 ,...,.c OJ ....

2 29 441 16 23

5 1 16

9 28 442 22 24 13

2 20

10 =' a 1 33 520 21 29 18 3 3

11 60m QJ QJ ..c::,.c

2 112 484 14 42 12 1 10

12 40m 30m .....J

2 61 578 22 28 14 3 18

13 30m 5m ....

4 52 467 19 40

8 1 8

o ='

14 80m 0 61 513 24 45 16

7

8

15 25m

o ()() 42 433 21 58 13

2 5

e= ='

16 7m QJ 0 J.f ,.. 80 356 43 64

8

4 10

17 4m .rJ"c.rJ 1 175 407 52 147 13

6 1

18 1"'"1 QJ ....

2 49 462 26 96 12

7 13

19 Q)-r1

2 34 482 24 107 17 12?

2

20

r-1 ,.. 39 604 12 123 14 3 2

21 ) ....

o tI)

2 66 738 21 170 20 6?

22 OJ

2 53 358 38 162 15

4

23 89 805 13 199 37 9?

24 80m 1 72 663 37 239 23 325 52 767 30 252 23

26 26 641 19 253 ?

27 83m 9m 83 266? 39 137 3 1 14

28

2 74 238 24 130

8

4

29 1 57 473 21 225

4

3 3

30 1 104 289 22 159

6

4 2
Table 2 is a chronological listing of successfully located earthquakes. For each event the following data are presented:

Origin time in Hawaii Standard Time: date, hour (HR) , minute (MN),

and second (SEC).

Epicenter in degrees and minutes of North latitude (LAT N) and

West longitude (LONG W). Poor convergence of the epicenter solution

is indicated by"?".

Depth - depth of focus in km. Assumed" depth is indicated by "x".

Mag - magnitude, if determined.

NO - number of stations used in locating earthquakes.

GAP - largest azimuthal separation in degrees between stations.

DMIN - epicentral distance in km to the nearest station.

ERT - standard error of the origin time in seconds.

ERH - standard error of the epicenter in km.

ERZ - standard error of the depth in km.

MD - mean deviation of the time residuals. [= ; Ri/NOJ where

Ri is the observed seismic wave arrival time less the

computed time at the i th station.

Q solution quality of the hypocenter. This measure is

intended to indicate the general reliability of each

solution:

Q EPICENTER FOCAL DEPTH

A excellent good

B good fair

C fair poor

D poor poor

Q is based both on the nature of the station distribution with respect

to the earthquake and the statistical measures of the. solution. These

two factors are each rated independently according to the following

scheme:

8
A

B

c

D

Station Distribution

NO GAP DMIN

> 8 < 1200 < DEPTH or 5 km

> 6 < 1500 < 2 x DEPTH or 10 km

> 6 < 225 0 < 50 km

> 4 < 1800

Others

Statistical ~feasures

ElLlf(km) ERZ(km) MD(sec) RMAX(sec) *

A < 1.0 < 2.0 < 0.10 < 0.25

B < 2.5 < 5.0 < 0.20 < 0.50

C < 5.0 < 0.30 < 0.75

D Others

Q is taken as the average of the ratings from the two schemes, that is,

an A and a C yield a B, and two B's yield 3 B. ~Vhen the two ratings

are only one level apart the lower one is used, that is, an A and a B

yield a B (Hamilton and others, 1969).

The criteria for Q are the same as used by the Office of Earthquake

Research and Crustal Studies, U. S. Geological Survey.

*~~ is the maximum residual

9
SUMMARY OF SEISMIC EVENTS

1912 HR MN SEC LAT N LONG DEPTH MAG NO GAP OMIN ERT ERH E

APR l 2 11 32.5 19-22.6 155-18.6 15.6 1.2 9 73 2.8 0.17 0.1 1

, 1 2 39 1 • 1 19-23.1 155-16.3 20.5 1.4 12 70 1.4 0.20 0.8 2

1 3 45 57.7 19-23.2 155-25.8 2.9 1.3 13 193 1.1 0.18 0.9 1

1 4 38 20.6 18-50.3 155-20.8 10.8* 15 265 37.0 0.41 2.8 

1 5 1 41.8 19-21.1 155-24.4 8.7 2.2 19 108 2.5 0.05 0.1 1

1 B 16 30.3 18-54.6 155-20.4 14.1* 2.4 14 250 35.1 0.42 3.1 

1 8 25 51.4 18-44.9 155-15.4 8.0* 2.7 12 301 50.3 1.24 1.9 1 8 29 45.0 18-50.5 155-18.2 1.6* 3.0 21 260 41.1 0.48 3.2 

1 8 34 45.D 18-54.1 155-22.3 9.3 2.3 11 250 32.2 0.30 3.6 4

1 8 58 48.4 18-49.2 155-18.0 8.0* 2.6 19 264 42.4 0.47 3.1 

1 9 30 9.5 lq-19.1 155-11.6 8.0* 0.3 12 166 5.3 0.10 0.8 1 9 52 13.3 18-49.9 155-18.1 1.3* 2.5 16 262 40.9 0.39 2.6 

0 1 10 58 14.4 19-18.6 155-13.4 8.3 1.6 16 119 7.5 0.11 0.8 2

1 13 40 42.5 19-19.9 It55- 1.4 8.e 1.3 14 110 5.9 0.16 1.6 1

1 14 25 15.q 19-21.3 155- 7.81 2.4 1.8 16 145 8.9 0.33 0.6 1

1 14 58· 12.1 19-19.5 155- 7.0 1.8 1.9 16 178 6.9 0.11 1.6 0

1 16 36 38.8 19-20.9 155-11.21 1.1 2.0 11 150 3.2 0.31 3.4 5

1 16 39 43.2 19-22.'3 155-23.6 8.0* 0.8 10 230 7.3 0.31 2.3 

1 19 19 23.9 19-18.7 155-16.0 8.5 1.2 16 170 3.6 0.12 0.9 1

1 22 31 36.0 19-22.1 155-22.9 3.5 0.8 12 169 4.6 0.11 1.1 1

2 1 27 33.6 19-25.1 155-50.8 6.0 1.9 14 136 17.1 0.22 3.1 3

2 7 53 50.6 19-21.8 155- 2.6 7.7 0.4 12 137 3.6 0.19 2.1 1

2 8 40 19-18.2 155-16.7 9.0 0.8 15 201 3.4 0.19 1.3 1

2 14 39 45.5 19-22.5 155-24.6 8.0* 7 218 4·9 0.20 1.4 

2 21 22 13.3 19-19.8 155-12.6 3.6' 10 203 6.4 0.29' 1.6 2

3 6 20 56.7 19-19.6 155- 1.4 8.0* 11 186 1.8 0.20 1.8 

3 10 28 1.6 18-48.4 155-19.6 10.1* 12 271 40.6 0.60 4.1 

3 11 20 31.1 18-47.0 155-11.4 8.0* 2.5 9 282 45.3 0.51 3.1 

3 11 51 32.7 19-25.5 155-28.7 7.3 2.2 11 91 12.3 0.13 0.7 0

3 12 5 49.q 18-45.8 155-16.0 8.0* 2.2 9 300 48.4 1.53 9.8 

SUMMARY {)F SEISMIC EVENTS (CONTINUED)

1912 HR MN SEC lAT N LONG W DEPTH HAG NO GAP OMIN ERT ERH E

APR 8 5 5 1.8 18-52.2 155-18.8 16.5* 2.1 19 255 35.6 0.29 1.9 

8 7 46 6.2 19-22.3 155- 5.51 0.0 16 123 b.4 3.59 1.1 7

8 8 3 16.5 19-11.3 155-17.b 30.(, 3. 1 27 149 2.2 0.13 0.8 1

8 q 47 6.q 19-11.6 155-18.1 28.8 2.2 23 147 1.2 0.18 1.1 1

8 19 40 57.7 19-22.3 155- 6.3 7.5 2.5 20 III 6.3 0.10 0.9 0

8 19 55 12.2 19-19.1 156-23.1 8.5 2.9 22 279 53.6 0.42 4.5 10

8 20 8 32.0 19-19.3 155-13.4 8.0* 1.5 14 205 7.2 0.12 0.8 

8 23 48 45.9 19-18.3 155-17.3 2q.3 17 166 2.4 0.17 1.0 1

9 o 45 45.9 19-11.9 155-11.4 29.2 16 168 2.1 0.18 1.1 1

9 3 32 39.4 19-19.0 155-11.2 25.4 1.9 15 141 2.1 0.22 0.9 1

9 4 42 20.2 1q-18.8 155-11.3 26.1 1.1 15 152 2.4 0.24 1.0 2

9 6 31 11.q 1q-19.6 155- 8.1 8.5 1.9 14 113 4.9 0.11 0.9 2

9 8 3 25.3 19-20.1 155-13.41 0.7 1.4 11 155 6.0 2.03 1.0 1

9 q 42 9.7 19-24.6 155-24.5 8.0* 0.2 10 208 8.3 0.12 0.8 

9 9 52 23.5 lq-19.8 155-17.2 6.1 0.9 10 166 0.7 0.12 0.8 0

9 11 29 11.8 19-11.4 155-16.9 32.2 3.2 23 151 3.1 0.15 1.0 1

9 14 12 13.0 19-20.1 155-11.0 23.0 12 142 0.7 0.27 1.1 2

9 15 33 6 •.-\ 19-20.6 155-12.31 1.4 2.8 11 151 3.4 0.09 0.8 1

9 16 41 40.4 19-20.8 155- 7.4 4.8 2.3 14 153 4.8 0.19 1.4 1

9 13 1 45.0 19-18.6 155-15.4 9.7 1. 7 14 188 4.4 0.09 0.1 0

9 23 13 21.6 18-45.6 155-20.01 5.1* 2.8 11 299 42.8 0.51 3.6 

.10 5 19 53.0 18-48.8 155-18.9 2.5 3.1 14 211 41.2 1.22 2.9 1

10 21 59 11.0 19-20.8 155-24.1 7.6 2.0 10 124 2.6 0.06 0.6 0

10 23 20 50.4 19-21.1 155-24.2 5.1 1.6 10 158 2.2 0.12 0.7 1

10 23 32 16.2 19-19.4 155-11.8 2.7 2.8 24 110 5.8 0.11 1.0 1

10 23 35 24.6 19-20.2 155-12.0 8.5 12 204 4.3 0.11 0.1 1

11 11 24 51.4 19-22.9 155-28.3 4.9 2.8 19 51 10.0 0.12 0.9 1

11 12 40 16.4 19-24.0 155- 2.3 1.2 2.3 17 128 1.7 0.64 1.1 211 13 32 49.9 18-50.4 155-11.5 1.8* 3.0 20 261 39.6 0.48 3.0 

11 21 34 59.5 19-20.5 155-15.9 8.1 1. 1 12 132 2.1 0.01 0.6 0


SUMMARY OF SEISMIC EVENTS (CONTINUEO)

1972 HR MN SEC LAT LONG w DEPTH MAG GAP OMIN ERr ERH ER

hyq 18 ?3 58 38.6 19-23.1 155-26.0 8.0* 0.6 13 195 7.2 0.15 1.0 

19 o i8 7.8 19-22.5 155- 8.8? 7.9 1.4 19 118 2.0 0.14 1.3 0.7 

19 1 79 20.1 18-49.0 155-16.0 2.0. 2.6 14 265 43.1 0.52 3.3 

19 8 41 55.7 19-23.4 155-25.0 8.1 1.4 11 121 6.1 0.07 0.5 0.4 

19 9 58 59.1 18-53.3 155-19.9 10.1 1.6 11 219 33-0 1.09 5.5 4.1 

19 10 5 2.1 18-48.3 155-17.1 8.0* 3.1 16 273 43.4 0.51 3.3 

14 10 16 3Y.7 18-51.7 155-38.8 43.6 3.9 26 263 3.0 0.52 2.5 3.1 

19 10 35 21.8 19-20.3 155- 8.2 4.3 13 163 4.4 0.18 1.3 1.4 

19 12 1 20.Q 18-45.0 155-14.1 8.0* 2.1 14 288 51.2 1.50 9.3 

20 o 20 5.3 19-19.4 155-24.5 5.9 1.2 11 112 2.6 0.10 0.8 0.9 

20 7 55 11.7 19-24.4 155-24.5 8.0* 9 207 8.0 0.15 1.0 

t--& 70 15 141.7 19-11.5 155-21.2 5.3 2.1 17 171 12.3 0.15 1.C 0.8 

lJ1 20 16 55 15.1 20- 0.8 155-33.6 42.0 14 198 26.3 0.83 3.8 8.6 

20 11 42 26.2 19-23.4 155-26.2 8.0* 1.0 9 199 1.8 0.10 0.7 20 22 o 46.q 19-19.0 155-15.3 10.7 1.5 10 lq3 4.2 0.15 0.7 1.'3 

20 22 2 32.q lq-32.9 156-16.1 4.6 2.4 11 298 52.1 0.58 10.6 13.2 

21 1 2 11.5 19-16.9 155-22.8 4.1 1.1 11 188 6.2 0.14 1.0 1.2 

21 1 3 6.2 lq-16.q 155-22.7 4.5 2.4 15 181 6.2 0.15 1.0 1.2 

21 1 6 5.0 19-17.3 155-22.1 4.5 1.2 10 117 5.4 0.16 0.9 1.1 

21 1 37 51.5 19-16.9 155-22.5 5.1 2.4 17 188 6.2 0.12 0.9 0.8 

21 4 49 56.6 18-49.6 154-41.1 8.0* 2.6 8 333 71.9 2.09 71.5 

21 10 5 32.4 19-19.6 155- 9.3 3.8 2.5 21 113 4.1 0.16 1.0 1.1 

2111205b.5 18-50.2 155-18.1 5.2 3.2 23 262 39.6 1.18 2.6 7.4 

21 13 41 17.7 19-24.3 155-23.4 8.6 11 171 6.6 0.08 0.7 1.3 

21 19 15 11.6 19-19.9 155-12.0 5.1 2.2 19 163 5.5 0.14 1.0 0.9 

21 23 41 25.6 20- 5.3 155-31.8 53.4* 2.3 11 311 34.8 0.42 3.5 

22 1 41 11.4 19-22.8 155-24.61 8.1 2.0 18 99 5.4 0.08 0.5 0.5 

22 1 52 22.5 19-23.1 155-24.0 6.2 1.6 11 185 5.4 0.12 0.8 1.0 

22 2 28 2.9 19-21.1 155-14.0 6.3 1.4 14 159 4.1 0.19 1.1 1.1 

22 4 48 23.1 1Q-10.2 155-36.5 6.3 2.3 11 101 8.1 0.18 1.0 1.1 

SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERT ERH ER

APt< 26 4 13 43.4 lQ-lO.7 155-22.1 24.0 1.7 14 207 13.3 0.25 2.1 2.

26 4 48 23.4 18-52.4 155-16.0 5.2 2.1 13 256 37.8 1.58 3.4 10.

26 5 46 19.8 18-51.5 155-17.8 8.0* 2.1 10 270 31.1 0.31 2.0 

26 5 49 29.4 18-51.8 155-17.3 8.0* 2.1 11 288 48.4 0.82 5.3 

26 6 25 30 6.8 18-54.6 155-20.0 9.8 2.5 10 215 30.8 0.33 1.9 1.

26 6 29 41.5 18-51.2 155-16.8 3.4 3.0 16 258 38.9 1.54 3.6 g.

26 6 35 53.0 18-52.0 155-11.1 4.5 3.0 15 275 31.5 2.10 4.1 11.

26 6 45 24.9 18-56.4 155-21.5 8.A 2.8 10 266 32.6 0.81 5.3 3.

26 6 48 o. f} 18-53.4 155-18.7 8.1 2.1 11 280 33.8 0.81 4.9 3.

26 7 3 23.9 18-52.6 155-17.7 8.3 2.5 13 268 36.0 0.53 3.0 2.

26 7 10 18-51.0 155-16.4 4.1 3.0 18 265 30.5 0.49 2.4 3.

26 8 53.9 lQ-21.4 155-16.1 24.4 17 110 2.4 0.12 0.8 1.

'-J 26 \.} 34 11.2 19-24.4 155-24.8 8.0* 1.1 8 213 8.1 0.08 0.5 

26 q 42 2 • '+ lq-22.4 155-24.31 6.0 1.0 8 210 4.4 0.35 2.0 3.

26 10 4 1L..'j 19-20.0 155-11.5 8.0* 9 162 4.8 0.05 0.4 

2.6 12 12 31.4 19-32.4 155- 6.5 8.0* 2.2 9 228 6.2 O. 12 0.9 

26 18 43 15.9 19- 22. 1 155-23.51 8.0 1.8 q 121 3.6 0.10 0.1 1.

26 20 46 58.9 19-19.q 155- 6.8 lO.l 1.5 9 255 6.1 0.24 1.6 1.

26 2, 9 27.3 19-18.7 155-13.5 8.0* 1.6 8 216 1.3 0.15 1.1 

27 o oJ 3 37. C 18-53.3 155-17.4 8.2 12 282 35.1 0.69 3.8 2.

27 55330::1.6 19-22.4 155-22.8 7.2 1.4 7 164 4.1 0.42 1.0 3.

21 7 L8 35.1 19-21.5 155-15.2 28.1 12 138 2.0 0.19 1.0 1.

21 7 38 57.2 19-19.4 155-15.1 6.4 1.9 15 119 3.2 e.15 1.0 0.

27 8 4 38.1 lq-18.6 155-11.1 11.8 2.2 10 228 7.3 0.21 2.3 2.

27 11 3 23.8 19-19.5 155-13.9 6.4 1.8 16 163 6.3 0.13 0.9 0.

21 12 41 2.9 19-20.4 155-11.4 8.1 2.1 7 209 4.2 0.09 0.6 1.

21 18 59 40.2 19-21.q 155-24.2 1.1 2.2 18 126 3.6 0.09 0.8 0.

21 22 53 51.6 19-26.8 155-24.5 8.0* 1.5 12 161 5.9 0.04 0.3 

28 6 18 48.3 19-23.1 155-25.11 o. () 1.6 12 116 1.1 8.87 0.8 16.

28 9 2 36.1 19-20.4 155-12.5 8.0* 1.1 11 155 5.5 0.10 0.8 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERT ERH 

APR 28 14 10 45.4 19-19.2 155-13.6 5.8 1.6 21 148 6.8 0.12 0.9 

18 19 15 22.3 19- 6.1 155-26.0 31.0 2.0 17 197 7.0 0.25 1.3 

28 20 21 54.9 19-18.1 155-21.6 5.6 1.5 14 158 4.9 0.10 0.7 

2A 20 32 24.1 19-19.0 155-16.0 1.8 1.4 12 185 3.2 0.18 1.4 

28 22 14 55.8 19-22.3 155-14.8 28.9 1.8 11 121 2.0 0.11 0.9 

28 22 35 1.q 19-18.8 155-15.6 9.6 1.2 10 194 3.9 0.28 1.5 

29 0 4 11.3 19- 8.6 155-33.5 45.1 1.9 15 132 10.0 0.71 2.9 

29 1 58 5.1 19-20.0 155- 1.41 C.O 2.2 11 229 15.2 4.41 1.6 

29 6 23 30.0 20- 3.9 155-32.8 51.8 2.5 25 202 25.3 0.39 1.6 

29 7 8 24.0 19-16.6 155-34.01 8.0* 1.5 10 177 19.9 0.42 4.9 

29 8 7.7 53.7 19-23.3 155- 4.G U.4 2.5 23 161 6.6 0.51 0.9 

J-& 29 16 29 48.7 19-24.4 155-24.9 8.0* 1.5 16 162 8.2 0.09 0.6 

00 29 lq 9 2.4 19- 5.7 155-28.3 31.5 2.3 21 180 7.1 0.26 1.3 

29 19 39 53.4 18-54.1 155-18.8 23.3 3.1 21 241 31.8 0.34 1.8 

29 21 50 12.1 19-11.2 155-31.41 41.6 1.8 17 "96 1.0 0.34 3.3 

3/"' '..J 1 46 19.9 19-28.1 155-28.6? 0.0 1.5 20 121 9.8 6.48. 1.0 1

-30 3 22 15.5 19-19.3 155-14.1 8.0* 0.9 13 191 6.0 0.15 1.0 

30 3 SG 1].7 19-16.5 155- 0.9 34.9 2.0 16 225 7.3 0.47 2.1 

30 7 29 27.9 19-13.0 155-18.2 25.3 1.7 23 172 9.3 0.15 1.0 

30 10 10 l8.4 19-23.1 155-23.2 8.0* 1.6 1 178 5.3 0.09 0.1 

17 16 8.4 1Q-20.8 155-14.3 6.1 2.2 13 161 4.1 0.22 1.3 

30 1-' 36 12.2 19-25.1 155-13.8 35.0 1.9 1 146 12.6 0.24 1.0 

30 11 51 7.8 19-20.3 155-12.7 8.0* 1.6 8 192 6.0 0.12 0.9 

30 22 41 51.6 19-22.0 155-24.7 7.9 1.5 10 131 4.2 0.01 0.7 

MAY 1 2 6 44.8 19-20.2 155-12.0 8.0* 1.8 9 202 5.1 0.13 1.0 

1 3 31 53.9 19-19.8 155-14.1 6.4 1.7 15 185 5.1 0.18 1.1 

1 5 9 49.6 19-23.8'155-27.91 1.6 2.0 16 145 10.5 0.09 0.7 

1 9 52 27.2 19-19.3 155-12.7 3.1 2.1 13 213 1.2 0.23 1.3 

1 9 55 34.3 19-18.1 155-13.8 ·13.4 1.6 7 226 7.4 0.20 1.3 

1 14 24 2.q 19-18.6 155- 9.2 1.9 1.9 12 185 6.5 1.95 1.5 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

191? HR SEC LA r LO("G W DEPTH MAG NO GAP DMIN ERT ERH ERZ 

MAy 1 15 38.:3 19-16.5 155-11.7 8.0* 1.4 8 265 10.7 0.56 3.3 

1 15 46 IG.8 19-19.0 155-14.1 12.4 10 204 6.1 0.25 1.0 l.q 

1 18 6 12.2 19-18.4 155-18.3 9.8 1. 1 8 184 0.9 0.22 0.9 1.

1 2l 49 28.6 19-18.9 155-14.3 7.0 2.1 19 171 5.9 0.15 1.0 0.

1 22 17 2Y.4 19-19.5 155-15.0 11.8 1 240 4.4 0.34 1.4 2.2 

1 22 }O 15.5 19-18.8 155-14.5 9.7 0.9 10 206 5.6 0.33 1.7 3.3 

1 23 le 41.0 19-50.1 156- 7.4 48.8 3.2 18 251 34.0 0.41 1.9 3.

1 ?3 28 7.4 19-19.5 lSS-14.8 11.3 1 242 4.6 0.35 1.4 2.

2 U 3 14.2 lq- 6.1 155-30.91 25.1* 1.4 13 182 21.3 0.15 2.9 

2 o 48 48.8 19-18.4 155-14.2 12.1 1.9 10 216 6.5 0.22 0.9 1.

2 C 51 8.2 155-24.0 8.3 1.0 9 113 1.4 0.14 1. 1 1.

L l 22 6.6 1q-22.4 155-16.7 23.8 1.3 9 101 1.5 0.32 1.4 3.

\0 2 2 56 18.3 19-25.0 155-27.0 8.0* 1.1 8 24q 11.1 0.18 1.1 

2 5 4 2.5 19-23.6 155-16.5 39.1 2.2 9 IG6 0.9 0.11 1.9 6.

-) 5 18 3:5.6 19-22.7 155-25.3 8.0* 0.9 10 167 5.8 0.10 0.9 

'-

2 5 56 30.6 lq-19.6 155-15.1 11 • 1 1.5 8 235 4.1 0.18 0.1 1.

2 ., 5e 22.8 19-19.9 155-15.4 10.3 1.8 6 248 3.5 0.33 1.3 2.

2 6 5 10.6 lQ-19.0 155-13.8 8.0* 0.8 8 208 6.1 0.14 1.0 

2 6 25 19-1Q.O 155-13.4 8.0* 7 211 7.3 0.15 1.1 

2 1 39 54.4 19-25.8 155-1-5.2 29.6 3.0 23 49 1.1 0.15 O.q 1.

2 7 55 6.4 19-23.7 155-22.9 8.0* 1.4 13 119 5.5 0.05 0.4 

2 9 31 50.3 lq-19.8 155-11.7 8.0* 1.6 7 216 5.2 0.17 1.2 

2 18 10 29.6 lQ-20.9 155- 8.1 10.S 1.6 9 157 3.7 0.17 1.3 2.

2 22 39 15. 3" 19-26.0 155-21.0 8.0* 1.0 12 113 11.5 0.04 0.4 

2 23 56 10.2 lq-22.4 155-22.7 5.6 1. 1 1 186 4.1 0.12 0.9 0.

2 23 56 50.4 1q-22.4 155-22.4 1.9* 1.1 6 116 4.3 0.10 0.6 

3 2 27 4.8 19-21.8 155-14.7 10.4 7 149 2.4 0.17 0.9 1.

3 l 43 45.5 19-24.2 155-17.1 13.4 1.4 16 81 1.5 0.06 0.6 0.

"3 14 34 37. 8 lq-24.8 155-24.0 7.8 3.0 20 63 1.1 0.09 0.7 0.

15 -36 29.3 19-19.5 155-16.3 10.2 7 215 2.3 0.16 0.7 1.
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1912 HR SEC LAT N LONG W DEPTH MAG GAP OMIN ERT ERH 

MAY 3 11 42 39.6 19-22.5 155-22.5 6.5 0.9 9 156 4.4 0.25 0.6 

3 20 9 56.0 19-22.6 155-29.2 8.0* 1.8 11 157 11.2 0.04 0.4 

3 21 41 54.6 19-19.2 155-15.4 6.1 0.9 11 185 3.8 0.26 1.4 

4 l 7 28.0 19-27.7 155-29.5 8.0* 0.6 7 288 11.5 0.32 1.1 

4 2 16 33.7 19-19.1 155-17.7 16.2 0.6 9 187 2.0 0.39 1.7 

4 3· 34 29.0 lq-24.2 155-23.3 8.8 1.3 14 110 6.4 0.09 0.8 

4 7 25 42.3 19-29.1 155-20.1 17.2 1.1 8 290 2.9 0.92 3.9 

4 7 51 18.5 19-25.1 155-25.2 8.0* 1.1 11 127 8.3 0.05 0.5 

4 11 32 12.0 19-18.6 155- 7.6 8.0* 1.8 7 202 7.5 0.09 0.8. 

4 16 21 54.4 19-22.8 155-25.9 8.0* 1.6 11 117 6.6 0.06 ·0.5 

4 20 13 2.5 19-21.0 155-23.8 8.0 0.4 9 212 1.6 0.15 1.2 

N 4 21 10 58. 1 19-19.4 155-11.2 8.C* 1.2 10 204 7.2 0.12 0.8 

0 4 21 47 38.5 lQ-23.0 155-25.8 8.0* 0.9 8 239 6.8 0.21 1.3 

5 l 35 lq-25.7 1'55-22.5 8.0* 0.8 8 162 4.8 0.09 0.8 

5 2 o 31.(" 19-23.9 155-17.4 12.5 0.7 10 112 1.2 0.14 0.6 

5 6.3358.1 19-20.8 154-53.9 26.9* 2.3 7 342 28.0 1.38 9.8 

5 12 53 20.5 19-59.3 155-48.0 3.2* 2.5 13 201 15.6 0.12 1.2 

5 21 44 21.9 lQ-23.0 155-22.41 0.1 0.8 11 156 4.9 2.26 0.7 

6 3 7 18.7 lq-lO.2 155-10.3 35.5 2.0 13 263 20.4 0.56 3.1 

6 1 18 8.9 19-19.1 155- 9.1 4.2 1.5 17 171 4.5 0.11 1.2 

6 10 j4 le.o 19-22.3 155-23.01 8.2 10 117 3.9 0.08 0.5 

6 14 27 15.4 lQ-ll.O 155-20.0 40.1 1.2 14 117 13.1 0.20 1.0 

6 16 1 25.3 lq-21.1 15'5-23.4 12.0 1.8 11 137 1.1 0.17 2.0 

6 IIJ 29 0.7 18-49.8 155-15.3 2.1* 2.8 22 263 42.5 0.42 2.7 

6 20 o 50.4 18-49.6 155-15.0 8.0* 2.9 16 263 43.1 0.43 2.9 

1 3 '.. 8 9.2 19-24.3 155-17.2 13.4 1.3 12 59 1.2 0.16 0.6 

7 16 1 1't. 7 19-18.1 155-11.5 2.6 1.3 9 191 7.8 0.36 2.2 

7 20 12 26.7 19-20.1 155-10.2 9.6 1.2 9 238 2.6 0.21 1.4 

1 20 56 18.4 19-18.5 155- 4.91 0.0 2.9 19 218 10.9 6.04 2.0 

1 22 51 35.5 19-23.4 155-27.1 8.0* 2.0 9 128 8.9 0.04 ·0.4 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 Ht{ MN SEC LA T LONG W DEPTH MAG NO GAP DMIN ERT ERH ER

MAY 8 16 q 7.4 19- 7.g 155-38.3 0.1* q 119 13.2 0.15 1.5 

8 22 '>3 59.2 19-,24. 7 1.55-26.0 8.0* 1.6 15 111 9.5 0.05 0.4 

8 23 14 45.9 19-22.5 155-24.41 8.6 2.4 19 51 4.6 0.08 0.6 0.

8 23 20 3.1 1q-19.9 155-12.6 8.0* 1.3 8 199 6.3 0.12 0.9 

8 23 27 19.4 lq-24.7 155-15.6 19.3 1.0 13 91 3.8 0.12 0.7 1.

C 9 lq-19.7 155-16.2 9.9 1.5 6 221 2.3 0.19 0.7 1.

'-j J 18 34.1 18-51.9 155-17.3 8.0* 2.7 12 269 37.3 0.35 2.3 

9 o 31 35.1 19-21.0 155-13.9 5.0 0.7 15 162 4.4 0.17 1.0 1.

9 3 43 8.0 19-21.4 155-16.1 26.8 1.0 13 105 4.6 0.20 1.0 2.

9 22 59 49.9 19-;?O.6 155- 8.2 10.1 0.8 10 168 4.0 0.10 0.9 1.

9 23 6 22..5 19-21.8 155-25.1 8.9 0.1 8 251 5.1 0.44 2.4 3.

N g 23 45 46.4 19-1q.6 155- 6.1 8.0* 0.6 9 181 5.1 0.25 2.6 

10 o 43 2.7.2 19-22.4 1"5-22.0 2.1* 0.9 9 89 4.1 0.10 0.1 

10 -3 3'5 5.4 lQ-17.4 155-21.7 8.0* 1.3 (3 251 5.5 0.43 2.5 

1--' 5 18 -j.4 19-23.7 155-26.2? G.e 2.1 15 83 8.2 0.63 0.8 1.

10 7 22 31.8 19-11.4 155-27.0 7.8 2.7 15 148 3.8 O.Oq o.q 0.

10 9 1 35.7 19-12.6 155-27.1 3.8 0.8 10 137 5.9 0.19 1.6 2.

10 22 G 33.8 19-52.4 1'55-17.9 q.8 1.9 11 261 36.1 0.64 3.0 2.

11 o 13 34.2 19-20.0 155-11.0 8.1 0.9 7 226 4.3 0.16 1.2 0.

11 8 4 13. 3 19-20.6 155- 8.8 9.2 1.3 8 221 3.2 0.23 1.7 1.

1 1. IE 28 34. l 1- 19-22.1 155-24.1 6.3 0.5 8 195 3.9 0.16 1. 1 1.

11 18 38 23.4 19-11.1 155-32.4 6.8 3.0 20 100 8.6 0.14 1.0 0.

11 18 43 4.2 19-14.9 155-24.3 8.0* 0.1 q 172 15.5 0.20 2.1 

11 19 36 41.7 19-18.9 155-14.7 11.2 1.6 10 200 5.2 0.19 0.8 1.

11 19 46 55.2 19-20.1 155-11.9 8.0* 1.5 9 206 5.1 0.13 1.0 

11 33 30.1 19- 9.2 155-36.1 34.2 2.1 15 152 10.1 0.33 1.3 3.

L2 14 3 58.q 19-11.4 155-24.41 4.0 1.0 14 118 5.6 0.12 1.0 1.

12 15 21 22.6 19-29.8 155-46.2 6.3 1.2 13 191 18.0 0.55 1.1 4.

12 15 44 43.3 19-19.8 155-15.1 6.1 0.1 17 141 4.1 0.09 0.8 0.

12 16 8 2J.l 19-20.2 155-16.1 9.6 1.4 9 207 2.3 0.17 0.8 1.
OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG DEPTH MAG NO GAP DMIN ERT ERH ERZ 

MAY 12 20 16 31.1 19-54.8 155-57.41 11.8* 2.1 12 312 54.3 1.07 6.7 

13 20 16 16.6 19-22.3 155-25.5 8.0· 1.4 11 139 5.4 0.06 0.5 

13 20 37 9.1 19-22.8 155-24.9 8.0* 0.9 13 137 5.5 0.08 0.7 

13 20 47 24.4 19-25.4 155-28.9 7.2 1.1 20 193 12.6 0.19 1.3 0.9 

13 21 52 22.9 19-25.6 155-28.8 7.3 0.8 ·11 195 12.3 0.16 1.0 0.7 

14 o 26 13.6 19-25.6 155-23.4 8.0· 0.6 16 130 5.9 0.08 9.6 

14 1 11 51.3 19-24.9 155-25.8 8.0* 1.3 14 158 9.6 0.07 0.5 

1- 9 39 52.S 19-35.3 155- 8.8 8.0· 10 249 12.8 0.20 1.1 

14 12 33 46.3 19-25.4 155-15.6 11.6 0.9 10 126 4.4 0.26 1.3 3.2 

14 13 15 18.8 19-23.0 15S-iS.6 8.0* 1.5 11 145 6.5 0.07 0.6 

14 16 49 10.6 19-19.6 155- 7.1 8.0* 0 •.6 6 187 6.7 0.14 1.4 

N 14 18 1 33.1 19-25.4 8.0* 1.0 9 223 10.7 0.15 0.9 

N 14 19 22 53.2 19-19.6 7.6 25.7 0.7 8 253 6.1 0.86 5.1 6.3 

14 19 34 48.0 19-21.2 155-!4.4 11.9 1.5 9 152 3 0 4 0.13 0.5 1.0 

14 20 3 35.9 19-22.9 155-24.3 8.0· 1.7 13 132 S.4 0.07 0.6 

15 2 4 45.7 19-20.8 155- 4.9 0.4 2.1 15 251 8.9 7.20 2.0 13.2 

15 2 45 47.1 155- 6.3 8.0* 0.8 8 236 6.3 0.24 1.7 

15 4 5 36.0 19-28.7 155-'15.1 25.3 3.3 23 66 5.9 0.15 1.0 1.1 

15 5 4 27.8 19-19.6 155-16.0 8.8 2.7 18 161 2.7 0.01 0.6 0.9 

15 18 S6 36.3 19-20.0 ISS-11.0 11.2 1.1 13 227 4.4 0.31 1.3 2.2 

15 23 26 51.3 19-21.2 155-17.9 2.4 20 63 2.2 0.11 0.8 1.3 

16 2 17 13.1 19-16.6 155-22.2 6.1 2.8 25 1·37 6.7 0.08 0.7 0.6 

16 6 34 20.8 19-23.4 155-27.5 7.8 1.4 9 231 9.5 0.17 1.2 0.1 

16 14 17 33.5 19-19.2 155-18.4 6.5 1.8 9 146 2.2 0.17 1.3 1.0 

16 18 1 23.5 19-23.6 155-25.11 4.1 2.8 18 76 7.1 0.11 1.0 4.6 

11 o 41 17.3 19-19.4 155-16.4 9.4 1.3 7 227 2.2 0.06 0.3 0.4 

17 ! 47 20.8 19-21.1 155-28.6 0.6* 0.8 10 124 9.4 0.10 0.8 

17 2 49 3.7 19-22.4 155-26.81 0.0 2.0 14 76 7.4 1.76 0.8 22.5 17 2 50 8.0 19-23.6 155-16.3 17.6 1.8 8 106 1.1 0.97 3.7 8.8 

11 5 33 2A.9 19-18.1 155-15.2 11.8 0.4 9 200 4.6 0.15 0.6 1.2 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1912 HR MN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH ERZ 

MAY 17 6 53 5Q.2 19-26.3 155-27.1 8.0· 0.4 10 141 9.3 0.06 0.6 

17 12 11 4.5 19-18.0 155-15.8 9.8 0.6 9 268 4.8 0.63 3.4 3.3 

17 16 6 54.3 19-22.3 155-23.4 9.5 0.4 9 184 3.9 0.30 1.2 2.8 

17 16 9 43.b 19-25.6 155-21.8 A.O· 2.0 16 76 11.1 0.06 0.5 

17 16 41 9.7 19-19.2 155-1J.S 13.7 8 204 1.0 0.12 1.0 0.6 

17 21 S8 20.1 19-22.1 155-21+.6 8.0* 0.8 9 134 5.2 0.08 0.6 

11 23 26 10.9 20- 0.9 155-14.1 58.3 1.6 16 227 17.9 0.71 3.1 5.8 

18 2 13 35.6 19-19.9 155-16.6 8.9 7 208 1.- 0.10 0,6 0.8 

18 5 23 26.9 19-32.2 155- 9.9 6.5 14 127 11.3 0.11 0.8 0.9 

18 6 15 1.4 19-20.0 155-14.8 5.9 2.2 16 164 4.5 0.12 0.9 0.8 

18 12 5 21.8 19-17.6 155-10.81 0.0 2.5 16 191 9.5 4.30 1.0 8.1 

N 18 12 47 13.9 19-18.3 155-14.8 10.6 9 211t 5.6 0.16 0.7 1.3 

w 18 11 1 40.2 19-21.7 155-16.4 25.0 0.8 9 124 1.1 0.37 1.6 3.3 

18 11 19 10.1 19-20.3 155-19.2 26.7 16 126 3.1 0.14 0.9 1.4 18 19 o 29.2 19- 9.8 155-37.4 6.8 2.7 16 128 9.4 0.16 1.0 0.8 

18 22 27 14.0 19-21.2 155- 4.9 6.2 3.1 21 118 4.3 O.llt 1.1 0.7 

18 22 49 22.6 19-23.6 155-23.5 8.0*-0.0 7 184 6.3 0.11 0.8 19 0 2 52.3 19-27.9 155-52.3 7.1 1.7 13 187 8.0 0.13 2.7 2.9 

19 o 51 11.6 19-22.1 155-25.01 7.8 1.1 8 233 4.5 0.24 1.2 0.9 19 2 56 55.1 18-44.0 155-29.2 13.8· 17 298 47.1 1.27 7.9 

19 5 50 6.1 19-18.8 155- 8.3 8.0· 1.0 9 244 6.1 0.38 2.4 

19 6 11 34.5 19-20.1 155-12.21 8.1 1.2 13 203 5.5 0.19 1.4 0.7 

19 10 11 55.9 19-20.1 155-13.1 5.6 0.8 14 157 6.5 0.13 0.9 0.9 

19 20 31 30.7 19-19.4 155-11.6 5.0 1.1 16 172 5.9 0.23 1.4 1.2 

20 8 0 9.4 19-19.5 155-15.8 24.1 2.7 23 140 3.0 0.11 0.7 1.1 

20 12 2q 50.8 19-24.4 155-17.1 10.2 1.0 16 58 1.0 0.03 0.3 0.3 

20 13 11 7.5 19-23.9 155-17.2 10.2 1.3 11 54 1.1 0.08 0.7 0.1 

20 18 46 11.7 19-51.4 155-34.1 26.3 1.6 24 205 14.3 0.25 1.2 2.5 

21 S 10 49.6 19-21.9 155-24.01 8.3 1.7 13 62 3.3 0.08 0.7 0.5 

21 7 13 32.8 19-20.6 155-24.01 8.4 1.4 15 92 1.3 0.07 0.8 0.6 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERT ERH ERZ 

MAY 21 10 12 19-22.1 155-23.9 8.0 0.2 1 201 3.7 0.41 2.3 4.3 0

21 18 52 29.2 19-40.8 156-20.5 46.5* 3.3 18 321 47.4 0.42 3.0 0

21 22 48 18.4 19-22.3 155-25.1 8.0· 0.5 11 136 5.0 0.08 0.6 0

22 1 56 27.7 19-17.9 155- 4.6 34.6 2.5 12 266 12.0 0.61 2.4 4.6 0

22 2 12 0.3 19-19.7 155-13.1 8.0* 0.5 8 220 6.9 0.18 1.2 0

22 5 31 3.9 19- 9.6 155-35.31 5.9 3.1 18 201 10.3 0.25 1.8 1.8 0

22 1 59 16.b 19-27.9 155-21.2 8.0· 1 768 7.6 0.63 3.5 0

22 11 48 36.2 19-21.5 155-12.6 A.O· 8 160 6.0 0.01 0.6 0

22 12 12 24.2 19-22.4 155-23.7 8.6 0.6 9 158 4.0 0.11 0.7 1.8 0

22 19 30 Q.6 19-23.4 1!:JS-28.4 8.0* 1.4 10 142 10.8 0.07 0.6 0

22 19 56 21.5 19-24.0 A.2 2.3 16 14 7.5 0.06 0.4 0.4 0

23 11 2 44.2 19-19.6 155-16.2 9.7 1.6 7 229 2.3 0.11 0.6 o.e 0

N 23 14 50 18.8 19-21.1 6.6 2.0 15 159 3.3 0.11 0.1 0.6 0

23 16 35 19.0 19-21.3 155-23.9 5.0 0.2 7 212 2.3 0.42 1.5 3.0 0

23 17 48 45.2 19-17.2 155-18.3 30.1 14 170 1.6 0.23 1.3 2.2 0

23 18 48 54.0 19-22.2 155- 4.7 6.3 1.3 8 138 5.3 0.17 1.3 1.2 0

23 20 34 3A.9 19-28.8 156- 1.61 8.0* 2.8 11 310 44.8 3.62 25.8 

23 21 15 31.3 19-20.4 155-13.3 4.5 1.3 13 181 5.8 0.19 1.1 1.1 0

23 22 12 2q.6 19-22.9 155-23.41 7.3 2.0 1. 66 4.9 0.06 0.7 1.4 0

23 22 36 39.8 19-22.8 155-22.8 8.0 0 0.2 8 166 4.8 0.10 o.e 0

23 23 23 20.9 19-12.2 155-28.0 8.0* 0.9 9 121 4.9 0.17 1.6 0

24 o 39 13.3 19-36.8 155-14.4 8.0* 1.4 12 142 20.3 0.10 0.8 0

24 2 6 42.4 155-?2.9 8.0* 0.7 8 110 5.6 0.06 0.5 0

24 5 55 13.2 19-50.2 155-39.6 11.8 11 III 22.1 0.13 1.1 1.4 0

24 9 23 19-20.8 155- 5.5 3.1 . 13 147 4.1 0.11 0.8 0.9 0

24 15 4S 25.1 18-52.9 155-18.0 4i.8 14 258 35.1 0.61 3.0 3.0 0

24 16 10 38.1 18-51.8 155-17.4 9.3 14 262 37.4 0.55 2.1 2.6 0

24 17 41 58.4 18-50.9 155-15.1 0.4* 2.5 17 260 40.5 0.50 3.2 0

24 18 8 0.9 18-51.4 155-16.8 7.3 12 211 38.6 2.73 5.3 13.9 0

24 18 37 36.5 18-52.3 155-18.2 9.5 2.9 15 260 35.9 0.66 3.2 3.3 0

SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERT ERM ERZ 

MAY 26 3 54 58.2 19-24.4 155-17.0 11.8 1.4 9 96 1.9 0.29 1.0 2.4 

26 .. 5 23.9 19-18.2 155-46.2 5.6 1.6 9 173 11.5 0.17 2.0 1.7 

26 5 2 12.5 19-24.2 155-11.0 9.0 1.0 6 110 1.S 0.22 1.4 2.5 

26 5 23 8.3 18-54.5 15S-20.0 8.8 1.S 9 215 30.9 0.72 3.9 3.0 

26 5 50 31.1 19"24.5 15S-17.4 10.9 1.1 8 III 0.19 0.9 1.8 

26 10 1 26.8 19-24.2 155-17.8 9.8 1.3 8 84 1.9 0.12 0.5 1.0 26 11 48 lQ.9 19-24.3 155-11.4 10.9 1.5 6 96 1.8 0.37 1.2 3.1 

26 11 52 S.1 19-24.3 9.6 1.2 7 100 1.9 0.26 0.9 2.2 

26 16 15 15.5 19-20.3 155-13.4 9.3 1.5 11 183 5.9 0.26 1.2 2.5 

2b 18 48 18-50.1 155-19.0 8.0 0 9 267 39.1 0.22 1.4 

26 19 6 55.5 19- Q.9 155-20.2 43.3 2.5 20 lA1 13.5 0.29 1.3 2.7 

N

27 2 o 33.9 19-24.2 155-11.2 10.8 1.1 11 65 1.4 0.18 0.7 1.5 

27 5 2 49.6 19-24.1 155-17.7 9.1 1.3 8 1.9 0.07 0.4 0.6 

0'\ 94

27 6 32 21.7 19-24.4 155-23.7 8.0· 0.6 12 189 7.1 0.10 0.7 27 7 6 45.1 19-18.1 155--41.11 5.8 1.2 6 182 9.8 0.24 3.1 2.4 

27 9 53 29.9 19-1Q.9 155-16.7 9.4 7 206 1.3 0.09 0.5 0.7 

27 10 28 12.1 19-19.8 155-16.4 9.'5 7 217 1.8 0.20 0.9 1.4 

27 10 33 38.2 19-11.4 155-16.5 42.1 1.4 17 184 12.1 0.27 1.2 2.5 

27 10 36 11.0 18-56.5 155-20.9 11.5 3.6 28 239 27.0 0.31 1.6 1.8 

27 11 14 53.2 19-22.1 155-23.r; 9.9 1.5 19 60 3.6 0.04 0.4 0.6 

27 11 17 12.7 19-22.3 155-23.2 9.3 1.1 11 118 3.9 0.09 0.7 1.2 

21 14 6 48.8 19-20.1 1!;5- 7.8 9.4 1.2 10 16b 5.1 0.20 1.5 2.8 

21 14 33 19-19.9 155- 9.2 8.9 1.4 7 168 4.2 0.14 1.4 2.4 

21 18 51 27.6 19-16.1 155-22.71 0.1 1.5 17 192 7.7 9.53 2.2 17.4 

27 22 2 14.6 19-20.5 155-11.91 8.4 0.8 12 155 4.7 0.08 0.7 0.5 

28 o 33 57.5 19-24.1 lCjS"17.2 9.9 0.4 14 54 1.4 0.04 0.4 0.4 

28 8 4 28.4 19-24.7 155-16.8 10.8 1.4 9 101 2.0 0.15 0.5 1.2 

28 17 13 11.8 19-24.0 155-25.8 8.0* 1.6 10 196 8.2 0.14 0.9 

28 20 57 24.2 19-19.9 155-16.6 8.9 0.3 8 210 1.4 0.14 0.7 1.0 

28 22 31 2.l 19-22.1 155-25.2 6.2 2.1 19 68 5.8 0.09 0.7 0.8 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HH MN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH ERZ 

MAY 29 2. 10 27.1 19-14.1 155-20.1 33.6 1.2 10 218 11.1 0.85 3.1 1.2 

29 2 59 27.8 19-16.7 155- 6.41 0.0 1.7 9 266 11.6 2.21 3.6 22.4 

29 8 30 16.4 19-22.2 155-25.0 8.0* 1.6 9 135 4.8 0.06 0.5 

29 15 33 50.8 19-20.8 155-13.2 8.0* 1.5 9 114 5.6 0.11 0.9 

29 11 16 19-20.1 155- 8.7 8.8 1.2 12 165 4.2 0.15 1.2 2.5 

29 11 54 45.4 19-20.2 155-12.4 8.0· 0.4 9 198 5.7 0.12 1.0 

29 21 55 0.6 lQ-28.6 155-25.3 7.1 2.0 13 161 4.1 0.10 0.1 0.5 

30 1 6 3.8 19-18.5 15S-12.Q 20.1 1.1 8 225 8.4- 1.00 3.7 8.3 

30 7 19 2.8 19';'20.3 155-11.3 5.2 1.6 19 159 4.2 0.17 1.1 0.9 

30 9 12 55.5 19-23.0 155-29.5 3.0 0.6 16 64 12.0 0.14 0.9 1.6 

30 9 46 34.4 19-30.1 15S-57.A1 8.6 2.4 14 257 60.3 0.45 3.8 9.5 

N 30 9 56 21.0 19-13.1 155-21.6 25.6° 1.7 6 316 13.3 0.31 3.0 

'-J 30 19 10 7.1 19-19.3 155-10.2 8.0· 1.4 13 115 5.1 0.10 0.8 

30 19 22 14.8 19-13.1 156-14.6 1.9 2.9 19 299 65.7 0.32 5.2 3.2 

30 20 27 31.A lq-24.2 10.0 1 .3 12 60 1.5 0.09 0.5 o.e 

30 2.3 50 30.2 19-12.9 155-22.3 25.0 1.2 14 245 13.5 0.30 1.9 2.1 

31 0 4 25.5 19- 9.7 31.5 1.3 20 198 14.9 0.19 1.5 1.1 

31 1 o 20.6 19-24.5 155-17.0 10.1 1.2 11 66 0.1 0.14 0.1 1.2 

31 J 40 26.5 19-19.4 155-15.1 5.5 1.2 17 185 4.2 0.16 1.0 0.7 

31 7 o 51.4 19-31.2 156-29.6 3.6 3.1 25 246 60.0 0.42 3.2 4.4 

31 7 21 1Q.2 19-29.8 155-50.9 15.3* 2.7 12 226 25.6 0.23 1.7 31 9 55 1.3 19-20.6 155-11.15 4.9 13 131 0.9 0.10 0.8 0.6 

31 18 11 24.1 19-19.1 155-15.8 5.6 0.7 15 170 2.9 0.14 0.9 0.1 

31 19 28 22.2 19-25.4 155-17.4 10.0 0.9 9 195 0.3 0.15 0.1 1.0 

31 19 29 16. 0 19-24.3 155-16.6 8.3 0.8 10 81 2.6 0.06 0.5 0.8 

31 19 30 30.5 19-24.5 155-17.0 7.9 0.7 12 15 0.7 0.04 0.5 0.3 

31 Zl 55 lQ.3 19-19.6 155-13.3 4.4 1 • 1 12 200 7.0 0.28 1.6 2.1 

31 22 9 12.0 19-19.3 155-25.9 5.7 1.2 12 94 4.8 0.14 1.5 1.5 

31 22 22 40.3 19-24.3 155-16.9 9.9 1.5 13 74 1.7 0.15 0.9 1.1 

JUN 1 2 20 48.6 19-55.8 155-31.6 37.0 2.1 14 232 19.6 0.54 2.4 4.7 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH ERZ 

JUN 1 4 36 12.0 19-18.1 155-14.5 11.4 1.1 10 219 6.3 0.20 0.8 1.6 

1 4 44 32.9 19-24.6 155-16.6 1.0 0.7 10 96 0.8 0.06 0.3 0.3 

1 5 23 lq.8 19-24.3 155-17.1 14.6 1.2 10 73 1.6 0.09 0.7 1.0 

1 7 50 44.8 19-24.3 155-23.2 4.1 1.0 il 178 6.3 0.18 1.1 1.8 

1 9 44 36.4 18"53.5 155-19.6 8.9 2.7 12 255 32.8 0.53 3.3 3.4 1 12 40 51.1 19-19.1 155-11.6 3.3 1.3 13 176 6 •• 0.22 1.4 1.8 

1 13 32 55.8 19-19.2 lSS-lO.6 8.0* 1.3 11 230 5.5 0.24 1.S 

1 20 57 3.9 19-18.7 155- 9.1 3.7 1.2 13 184 6.4 0.21 1.4 1.9 1 22 0 7.0 19-24.5 155"29.0 7.3 2.0 20 87 12.7 0.08 0.6 0.6 

2 o 50 21.1 19-18.2 155-46.2 6.6 2.1 14 152 11.4 0.09 1.1 1.0 2 1 14 7.4 19-17.1 155-23.01 3.4 1.4 18 129 5.7 0.10 0.8 1.10

2 3 21 31.1 19-24.6 155-16.7 9.7 1.2 12 82 0.8 0.15 0.7 1.2 

00 2 6 21 51.6 19-20.1 155-12.51 ,. .1 1.1 11 198 6.0 0.24 1.3 1.8 

2 9 3 21.1 19-23.7 155-23.4 1.7 1.2 13 111 6.4 0.12 0.8 0.7 

2 9 51 19-13.8 155-25.5 3.5 2.1 20 134 5.2 0.12 1.0 1.1 

2 10 34 19-19.1 155-12.2 5.0 1.3 15 174 6.8 0.18 1.1 1.2 

2 10 37 8.5 19-27.8 155-29.0 5.8 1.7 11 219 10.6 0.27 1.4 1.0 

2 16 12 34.6 15S-23.A? 6.7 2.2 22 61 1.2 0.09 0.7 0.7 

2 17 19 4';.5 19-20.5 155-13.1 8.0· 1.5 11 181 6.0 0.13 1.0 

2 19 26 11.4 19-20.0 155-12.61 5.4 1.3 11 290 7.4 0.24 1.4 1.2 

2 23 34 28.4 19-12.1 5.7 2.5 20 113 4.8 0.10 0.8 0.7 

3 3 2S 47.1 20-33.7 155- 3.6 8.0* 2.4 10 326 80.1 3.21 19.1 

3 4 3 0.9 19-12.1 155-28.4 11.2 1.6 8 11. 5.9 0.28 2.8 3.2 

3 it 3 53.1 19-21.6 155-26.01 2.5 1.2 14 131 5.4 0.16 1.1 1.5 

3 5 51 39.7 20-10.4 155- 5.6 42.7* 2.1 8 304 40.8 0.59 4.2 

3 1 45 3.7 19-19.9 155-14.4 26.4 1.3 15 155 5.3 0.17 1.0 1.6 

3 11 11 q.l 19-24.0 155-24.9 7.0 2.3 21 78 7.6 0.10 0.8 0.8 

3 11 29 53.3 19-24.3 155-24.41 0.0 1.1 12 201 7.1 0.54 1.1 1.2 

3 11 32 59.2 19-20.6 155- 8.3 6.0 1.8 18 157 3.8 0.12 1.0 0.8 

3 12 20 15.5 19-16.7 155-25.2 4.2 10 121 2.7 0.22 1.7 2.3 
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG 'w DEPTH MAG NO GAP DMIN ERT ERH ERZ 

JUN 3 12 38 47.7 19--,24.4 155-25.3 8.0 0 1.6 13 150 8.6 0.07 0.5 

3 12 52 10.8 19-24.3 155-22.7 3.3 1.7 16 62 5.4 0.11 0.8 1.8 

3 13 11 52.6 19-24.1 155-26.21 0.0 1.7 10 142 8.8 1.34 1.3 21.5 

3 13 40 53.4 19-35.2 155-23.5 8.0· '1.2 11 163 9.9 0.13 2.3 

3 16 13 30.2 19-28.1 155-52.9 8.5 2.9 23 161 6.2 0.08 0.9 1.0 

3 17 19 11.6 19- 8.6 155-25.8 13.2* 1.9 12 190 21.3 0.16 2.0 

3 17 48 8.2 19-23.6 155-26.61 2.5 0.9 18 129 8.6 0.20 1.1 2.1 

3 23 20 43.7 19-22.3 155-22.8 1.9 0.9 14 144 4.0 0.17 1.5 1.0 

4- o 28 0.9 19-18.2 155-13.2 1.1 2.2 21 182 8.2 0.11 0.7 0.5 

4 o 49 48.8 19-18.1 155-13.1 8.0 0 1.4- 16 171 6.2 0.11 0.1 

4- 9 5 41.9 19-18.9 155--13.2 8.0* 0.5 9 215 7.6 0.14 1.0 

4 9 24 54.5 19-20.3 15S- 7.'9 1.7 1.2 14 162 4.8 0.15 1.4 0.9 

N

\D 4 17 43 59.0 19--18.8 155-14.0 8.0* 9 209 6.5 0.17 1.2 

4 20 28 46.1 19-24.2 155-16.1 20.0 1.6 20 63 3.3 0.10 0.8 1.3 

5 10 44 33.7 19-20.2 155-12.0 5.8 1.3 20 143 4.3 0.11 0.9 0.7 

5 16 55 34.8 19-22.4 155--25.2 a.o* 1.7 9 233 5.2 0.20 1.2 

5 21 8 42.2 19"21.0 155- 8.1 9.2 1.8 13 150 3.6 0.15 1.1 2.2 

5 21 30 35.1 19-13.3 155-12.9 13.0 1.1 8 312 13.3 1.02 4.9 3.3 

6 1 7.5 19-24.7 155-11.2 10.1 1.6 10 66 1.5 0.11 0.5 0.9 

6 13 16 1.8 155-33.81 2.6 2.6 21 108 16.6 0.24 1.3 1.5 

7 3 35 5S.1 19-24.8 155-17.1 q.o 1.0 13 69 0.3 0.08 0.5 0.8 

7 4 If, 59.9 19-24.0 9.4 1.0 16 111 4.8 0.05 0.4 0.9 

7 1 18 46.7 19-21.6 155-28.41 8._ 2.4 24 51 9.3 0.11 0.6 0.8 7 7 56 43.9 19-23.1 155-26.21 8.0* 0.1 14 200 '8.2 0.36 2.3 

1 8 51 23.6 19-26.0 155-22.3 6.9 1.0 18 95 4.0 0.08 0.7 0.6 

7 11 2S 9.6 19-19.7 155- 9.2 10.0 1.0 10 111 4.6 0.16 1.2 2.3 

7 13 43 3q.2 19-20.6 155-25.7 7.5 2.0 15 79 4.3 0.08 0.7 0.6 

7 15 50 19-18.1 15S-13.3 5.6 2.4 22 158 8.1 0.15 0.9 0.9 

1 17 57 48.5 19-20.1 155- 7.2 8.0· 1.1 10 167 5.9 0.09 0.9 

7 17 58 2q.6 19"19.0 155- 9.4 4.8 1.6 13 182 5.8 0.24 1.5 1.8 

SUMMARY OF SEISMIC EVENTS (CONTINUEO)

1912 HR MN SEC LAT N LONt; II DEPTH MAG NO GAP OMIN t::RT ERH ERZ 

JUN 11 13 38 38.5 19-20.6 155-19.7 2.1 0.0 8 0.29 0.4 1.1 

11 13 57 45.0 19-1Q.3 155-46.Q 6.1 1• 1 13 169 11.2 0.14- 1.3 1.2 

11 14 37 15.3 19-12.9 155-22.3 31.6 1 • 1 226 11.4 2.2 3.A 

11 17 36 26.6 18-48.9 4.9 0 1.6 10 323 1to5.4 0.117 S.2 

11 22 52 24.9 19-22.6 155-11.7 12.A 1.7 12 159 3.4 0 •. 11 1 • 1 1.0 

12 6 19 2.2 19- 9.7 155-31.5 1.9 1'l 124 6.4 0.13 0.9 

12 13 12 52.9 19-15.4 b.2 13 113 l.q 0.10 1 • 1 0.11 

12 16 6 3R.3 19-12.6 155-33.3 2.7 21 7.8 O.1? 0.9 o• 9 12 16 35 52.6 19- 9.6 155-31.4 6.2 20 125 b.l 0.14- 1.0 

12 11 23 57.9 19-22.9 155-24.] S .1 Ii 23b 5.:3 0.39 1.5 2.A 

12 11 29 13.0 lS5-27.Q 7.3 2.1 23 77 11.2 0.12 0.7 O.A 

w 12 18 2 16.8 19-39.8 155-?2.1 40.8 1 • 1 15 118 15.f) U.42 1.3 4.2 

12 20 12 47.1 19- 9.4 155-31.4 6.2 2.3 11 130 6.2 0.11+ O.H 

13 1 44 2.6 19-19.1 155-30.4? 0.0 2.2 21 71 5.27 O.A 10.u 

13 6 S9 3".1 19-20.Q 155-19.A 23.8 0.7 17 54 4.4 0.19 1.2 2.0 

13 8 57 15.9 19-21.9 155-15.1 25.1 121 1.1 0.14 1.0 1.4 

13 11 23 44.4 19-19.9 155-17.0 8.4 0.0 9 168 0.8 0.11 O.A 1.0 

13 19 40 41.5 19-41.0 156- q.q 5.3 1.2 14 30fl 67.7 0.25 6 •• 7.2 13 20 19 52.1 19-19.3 155- 9.1 8.0'" 13 178 5.4 0.08 U.6 

13 22 28 11.9 19-23.6 155-23.4 8.0* 0.2 12 193 6.3 0.09 0." 

13 22 41 53.3 19-1q.6 155-12.6 8.0a- 0.5 13 160 6.7 O. 11 O.Q 

14 3 3 A.7 19-20.3 155-17.7 5.b 1.0 14 0.7 O. 11 0.7 O.Q 

14 4 23 18.4 lq.. 7.4 155-25.6 37.0 2.4 21 178 1.9 3.6 

14 '" 41 6.3 19-18.6 155-11.6 8.0* 1.0 9 252 7.0 0.33 l.O 

14 1 54 20.1 19- 6.6 46.3 2.6 19 180 5.9 0.47 2.0 4.1 

14 20 3 31.4 19-23.7 155-26.41 8.1 1.4 19 73 8.4 0.07 0.5 0.5 

14 20 6 19-22.5 155-26.1 3.b 1 • 1 21 12 6.4 0.10 o. '7 1.2 

14 20 14 24.1 19-23.0 155-(»b.5 A.2 O.Q 15 74 7.6 0.14 0.8 1.0 

14 23 33 2.4 19-19.4 155-11.15 8.0" 0.1 IJ t?24 5.1 1.0 

14 23 40 5.1 19-15.8 155-21.6 1.2 1.S 21 11+6 8.7 1 .10 0.1 4.0 
SUMMARY OF SEISMIC EVEN1S

1972 HR MN SEC lAT N LONG W DEPTH NO GAP nMIN ERT ERH ERZ 

JUN 1 31 28.7 19-16.9 3.7 0.7 9 182 5.3 0.14 0.9 1.6 

15 4 45 47.9 19-10.9 155-47.41 6.2 2.5 19 '129 12." 0.10 0.7 0.7 

15 6 7.0 19-20.8 155- 6.1 1.6 1.'5 19 201 7.0 1.39 1.2 4.q 

IS 9 41 lA.6 19-53.7 155-40.81 9.2 2.3 IS 122 27.8 0.48 5.5 11.5 

15 12 40 25.2 19-26.1 155-45.4 13.46 1.5 15 198 0.12 1.0 

15 13 55 49.0 19-53.2 155-40.1 14.2* 2.5 21 121 25.8 0.10 0.9 

15 22 36 30.8 19-19.6 155-11.8 3.4 0.9 19 168 O.lA 1 • 1 I." 

16 14 40 10.3 19-19.0 155-25.2 6.3 1.9 12 110 4.0 0.10 0.7 0

16 15 6 21.1 19-18.9 155-21t.9 6.1 2.2 14 115 0.10 0."" 

16 18 59 11.0 19-19.7 155-11.4 1.4 13 168 S.l 0.08 0.1 

16 20 49 11.6 19-21.1 155-17.41 2.6 1 • 1 11 135 I.R 0.17 1.2 1.6 0

VJ 17 6 7 5q.2 19-19.4 155-12.6 4.0 1.3 11 212 O.2h 1.5 1.9 

N 17 15 8 7.4 19-22.1 2.7 2.2 21 11 5.5 0.11 0.8 1.4 

17 16 18 51.1 19-22.7 155-22.11 1.1 lu 110 4.6 0.21 O.R 0.9 0

17 19 12 35.9 19-20.8 155-15.8 28.1 1.7 13 130 2.9 0.20 1 • 1 l.b 0

18 2 20 22.4 19-25.2 155-24.4 8.0" 1.2 1'+ 7 • i, 0.07 0.5 0

Ie 4 29 34.7 19-20.8 155-12.1:\ R.l 1.4- 14 203 3.1 0.27 1.8 0.7 0

18 5 55 22.1 19-23.0 155-24.0 8.0'" 1.6 10 163 5.2 0.09 O.R 0

18 5 56 0.7 19-20.1 155- 8.A 4.6 1.6 18 165 4.0 0.15 1.0 1 • 1 

18 11 o 22.0 19-23.7 155-18.11 11.9 1.2 20 52 1.7 0.08 0.8 0.9 O

18 13 14 12.0 19-23.7 155-17.9 14.3 o.a 11 54 0.07 O.f\ 0.8 0

18 13 58 50.1 19-23.7 155-17.5 12.4 1.8 18 1 • 1 0.0" 0.8 0.6 0

18 16 4 31.8 19-20.3 155- 9.5 lO.b 0.2 8 161 3.3 0.12 0.9 0

18 16 11 15.1 19-23.6 155-17.3 13.3 0.8 14 50 ().8 0.04- o.s 0.4 0

18 21 8 9.0 19-23.3 155-26.2 0.8* 1.0 1& 72 7.b 0.11 0.1 0

19 10 40 41.2 19"23.5 155-24.6 8.0* 1.2 17 73 6.5 0.08 0.7 19 13 23 46.3 19-18.8 155- 9.4 7.0 13 184 6.1 0.21 1.6 1.0 U

19 13 40 5.9 19-23.8 155-16.4 17.4 0.6 14 89 1.2 0.07 0.5 0.8 0

19 16 18 57.1 19-19.2 155- 8.6 8.0* 0.3 8 180 5.7 0.08 U.6 0

19 21 S2 51.5 19-21.3 155-11.5 12.3 1.0 9 144 ... 3 0.19 1.0 2.u 0
SUMMARY OF, SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERT ERH ,ERZ 

JUN 19 22 2 58.4 19-' 1.8 155-23.1 34.9 22 213 16.5 0.36 I.A 3.2 

19 22 55 28.1 19-21.3 155-l3 •• 7.4 2.4 26 130 2.5 0.08 0.7 0.5 

20 o 17 35.6 19-18.1 155-15.4 0.5 '7 213 5.7 0.18 1.2 

20 5 6 13.5 19-21.1 155,,24.5 10.0 10 128 3.5 0.13 ().8 1.Q 

20 5 53 25.3 19-19.4 155-11.5 2.9 2.4 24 152 5.1 0.19 1 • 1 1.3 

20 5 55 16.5 19-20.8 155-12.0 7.3 0.7 If> lAl Ia..'t 0.13 1.0 0.6 

20 6 o 12.5 19-20.5 155-11.3 5.1 1.5 20 155 J.ti 0.11 0.9 U.8 

.20 10 S6 7.4 19- 6.7 155-37.2 5.3 1.5 12 125 15.1 0.21 1.1 

20 12 9 38.2 19-18.4 155- 8.4 3.3 0.8 14 190 7.4 0.22 1.5 1.6 

20 16 8 21.5 19-23.4 155-28.1 7.8 0.8 16 83 10.3 0.13 0.6 0.9 

20 22 19 31.8 19-20.1 155-12.4 5.1 23 143 1+.3 O.lt! 0.9 0.1 

w 21 1 11 38.8 19-19.9 155- 9.2 7.8 2.6 23 1-4 4.1 0.10 0.6 w 21 7 19 26.8 19-19.9 155-10.A 5.3 1 • 1 11 165 ,+.3 0.15 1 • 1 

21 8 40 4Q.6 155-17.6 13.5 1.0 19 47 1.4- 0.05 0.5 O.b 

21 11 38 25.5 lQ-21.b 155- 2.2 7.'+ 3.6 lSJ 3.4 0.13 1.0 0.'" 

21 15 18 56.8 19-28.8 155-15.5 23.q 0.9 16 166 6.2 0.11 O.A 1 • 1 

21 16 31 10.4 19-18.9 155-13.S 2.3 22 lC\l 6.1 0.14 O.'f 0.7 

21 Itf 3 45.2 19-20.1 155-11.1 12.2 1.5 10 221 4.2 0.34 1.3 l.Y 

21 20 14 8.5 19-26.6 A.2 1.5 15 153 9.8 0.15 1.1 2.4 

21 21 38 24.5 19-25.3 8.0" 12 1"3 5.3 0.0f, U.S 

21 23 45 41.8 19-19.6 155-12.6 3.1 1 • 1 lA 160 5.3 0.11 0.9 1.2 

22 1 4 51.1 19-17.6 155-13.91 8.0-0 1.7 13 19b 7.7 0.35 2.3 

22 2 49 53.9 19-25.1 155-25.0 1.0 18 12b 8.9 0.11 a.A 

22 7 22 16.8 19-23.1 155-25.5 s.a 1.1 20 53 6.7 0.10 0.6 0.1 

22 18 40 11.8 18-53.4 155-16.3 8.0" 2.2 12 272 45.5 0.16 5.2 

22 19 7 39.5 19-22.8 155-22.4 B.Oo 1.5 4."i 0.09 0.7 

22 19 9 SF,.3 19-20.6 155-16.1 33.4 1.7 15 147 2.S 0.20 l.q 

22 21 0 4.5 19-21.5 lS5-?5.4? 0.8 1.3 14 91 4.4 2.18 1.0 

23 ·0 2 49.2 19-5Q.l 155-37.3 14.2" 2.6 13 15fJ 22.q 0.15 l.q 

23 o 25 49.6 19-14.8 155-21.31 0.0 IS 214- 7.4 Q.20 1.6 17.5 
OF SEISMIC EVENTS (CONTINUEO)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP OM!N ERT fRH EHl 

JUN 23 1 o 3A.2 19-20.6 155-19.6 3.2 0.8 11 7S J.q O.OS 0.4 O.H 

23 3 23 10.1 19-20.3 155-12.6 6.3 19 lAl 3.9 0.13 0.9 0.7 

23 7 35 25.5 19-20.1 155- 5.2 3.6 1.9 12 208 8.9 0.26 1.8 1.:; 

23 13 53 6.7 19-20.1 15S- 5.41 0.0 1.9 17 208 8.6 1.7 

23 21 20 36.0 19-19.4 155-14.7 9.3 0.7 8 lA9 0.28 1.9 3.1 

23 21 46 54.9 19-19.9 155-14.3 8.0* O.q 16 179 5.4 0.12 O.Q 

23 22 11 8.4 19-19.3 155-16.1 b.4 0.5 13 117 2.H 0.14 0.8 0.8 

23 22 46 39.4 19-24.6 155-15.6 22.8 0.7 18 13 1.7 0.15 1.0 l.b 

24 1 22 41.2 19-25.3 155-27.9 1.0 2.1 21 154 11.(, 0.09 0.7 0."7 

24 8 3 57.4 19-18.6 155-14.61 8.3 0.3 12 209 0.27 1.5 2.1 

24 9 3 50.1 19-27.1 155-22.31 7.1 2.8 22 84 O.Ob 0.6 0.5 

w 24 9 38 10.6 19-26.8 155-22.51 7.7 1.4 1b AO 3.4 0.09 0.1 1.1 

24 11 28 9.8 19-19.2 155-18.41 1.1 0.9 10 139 l.4 0.15 1.0 0.5 

24 11 36 42.3 19-19.9 155-14.1 7.6 1.2 181 0.11 o.&; 24 12 10 18.7 19- 2.8 155-21.0 51.4 if) 201 12.4 O.7n 3.4 E-.3 

24 20 31 36.8 19-22.6 155-22.4 6.5 1.0 11 15l 4.7 0.11 U.f'; O.H 

25 o 55 23.2 19-20.1 155-16.1 O.f4 10 1158 2.4 0.25 2.7 

25 1 43 0.5 19-21.1 155-14.0 5.9 0.9 18 157 4-.0 0.12 0.9 0.7 

25 6 19 SQ.9 19-22.2 155-25.61 8.1 3.1 25 58 5.4 0.08 0.7 0.7 

25 12 44 55.8 19-21.0 IS!:t-13.3 A.O" 0.9 12 167 0.11 O.q 

25 16 30 29.0 19-14.4 155-22.2 7.2 1.0 10 lAO 8.8 0.14 1.1 0.7 

25 18 21 50.1 19-18.5 155- 4.9 ij.O* 10 262 0.16 4.5 25 19 51 31.2 19-16.1 15S-30.4 5.2 0.9 7 145 6.4 0.20 l.q 2.2 

25 22 37 7.9 18-56.1 155-14.1 13.00 0.9 12 246 34.6 0.86 5.k 

26 1 43 39.5 19-20.4 155-15.6 6.6 0.9 17 154 3.1 0.08 0."1 0.5 

26 6 11 5.6 19-22.8 155-25.A? 7.7 2.1 20 52 6.5 0.08 0.6 0.1 

26 7 40 29.1 19-19.6 9.7 1.4- 8 214 2.1 0.14 0.1 1.0 

26 9 41 0.3 19-30.1 155-41.41 1.2 1.3 12 107 13.8 0.13 1. or, 2.6 

26 15 56 41.5 19-22.1 155-22.6 l.g 0.2 7 156 3.7 0.09 0."7 0.1 

27 12 51 51.9 19-20.4 8.0 2.3 15 722 3.5 0.11 0.8 O.Q 
SUMMARY OF SEISMIC EVENTS (CONTINUEO)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERT EHH ER

JUN 21 14 7 36.0 19-19.6 155- 8.31 4.6 1.9 14 238 5.3 0.47 2." 1 .4 

21 20 10 13.7 19- 8.9 155-20.6 25.3 1.4 12 222 17.1 0.1 q 1.Y 2.9 27 22 28 26.5 19- 8.4 155-23.A 32.2 2.4 15 194 7.4 0.32 1.6 3.2 

28 4 5 11.0 19-21.9 155-23.0 4.9 1.5 12 138 3.1 0.11 0.9 1.0 

28 5 12 20.0 20-12.9 156- 8.8 8.0* 1.7 17 30R f46.7 O.lA 1.4 

28 12 15 10.4 19- 1.6 155-21.7 29.3 3.1 22 217 18.2 O.?3 1.2 2.3 

28 14 36 51.9 19-15.6 155-32.0 4.0 2.l. 1& 83 9.U 0.13 1.0 1.2 

28 11 7 20.3 19-19.3 155-15.3 6.4 1 • 1 16 1&0 4.0 O.lt! 0.8 0.6 28 22 41 49.9 19-50.8 155-23.0 2b.6 2.6 24 151 h.3 O.2A 1.5 

29 0 5 6.5 19-20.4 155-13.0 4.7 O.R 16 1 0.13 o.Q 1.1 

29 4 0 6.9 19-55.2 155-21.7 41.6 2.8 25 228 0.1 0.'1 1.4 

w 29 17 58 8.5 19-22.1 155- 3.0 b.9 0.6 .12 4.0 0.1f, 1.4 1.0 

V1 29 18 14 21.1 lA-52.0 155-18.1 7.6 1.7 16 255 1.08 2.1 7.3 

29 20 27 53.8 19-22.9 155- 2.4- 8.0* 0.6 10 134 5.' 0.17 1.5 

29 22 57 25.4 19-22.2 155-12.3 0.9 14 190 1.7 2.3 

30 0 0 7.9 19-19.3 155-13.6 8.0" 0.4 11 2U2 6.q 0.19 1.3 

30 7 o 32.4 19-19.5 155-15.8 6.2 1.0 17 164 3.0 0.11 0.1-' o.t-

30 1 33 51.8 19-20.3 155-12.4 A.O* 0.'5 12 194 0.17 1.2 

30 14 33 36.1 19-17.0 155-23.2 12 133 O.Ot) (J.8 0.8 

30 21 8 S.1 19-20.6 155-11.7 5.1 0.4 14 153 4.3 0.11t- 1.0 1.2 
Table 3. Fel.t earthquakes

Date T:ime Magnitude Felt report

H M S

Apr 11 2:~ 08 56.3 3.2 Kealakekua

19 10 16 39.7 3.9 Captain Cook, Kapapala,

So·uth Kana

May 2 07 39 5/,..4 3.0 Volcano

3 14 34 37.8 3.0 Kapapala

Jun 21 11 38 25.5 3.6 Hila, Pahoa

24 09 0';.J 50.1 2.8 Volcano
f19 34 .0 19 3q .0

o

+

+

x

... ·:X +.

-tr •• + • .•. .~.+ ... + ••

...

+

I

I

/

I

I

• L + ·

+

. : : ••+.~ .• •••••:•• ~+ I +.1... .:a.,.... -tr. • ••• -. •• c •• • • ·.aN-""" -1-. :... ..,...

. ..+.: .:-,.- . • •••• =--s-. -f,.

.f•.

+,

.

.

.. 6·

~., ..

·x

.+-tx X

+

.~ . +

..

•••H-

+

+

.. +.

+

+

*.....: .

.... ..

J. .....1· : •• • ;.f • •

:- .. . :. + .

+

. I

-h

+

+

+

,

,

)

)

.+

+

+

+

Symbol

*'

X

+

Magnitude

Interva I

4.0 < M 5.0

3.0 < M S 4.0

2.0 < M S 3.0

M 2.0

- -- 19 10.0

· 0_r---_r-----1_5 Km

19 10.0

Figure l.--Plot of epicenters in the Kilauea region. Triangles are

seismometer locations. Kilauea Caldera and the major pit craters

on the east rift are shown in outline. The Pacific Ocean lies in

the lower right portion of the illustration.

37
Table 4. Seismometer stations in Hawaii operated by the U. S. Geological Survey.

STATION NAME CODE LAT-N LONG-W ELEV TYPE CAL VCO RADIO REMARKS

AHUA AHU 19 22.40 155 15.90 1070 3 6.0 2380

CONE PEAK CPK 19 23.70 155 19.70 1038 3 1.34

DESERT DES 19 20.20 155 23.30 815 3 1.34

ESCAPE ROAD ESR 19 24.68 155 14.33 1177 3

HALE POHAKU HPU 19 46.85 155 27.50 3396 1 5.6 1360 RF6

HILINA PALl HLP 19 17.96 155 18.63 707 3 6.0 2040 System 3 to 1 6/27/72

HUALALAI HUA 19 41.25 155 50.32 2189 1 5.2 1700 RF4

KAAPUNA KAA 19 15.98 155 52.28 524 1 5.5 1020 RF12

KAHUKU KHU 19 14.90 155 37.10 1939 1 5.7 1700 RF3

KAPAPALA RANCH KPR 19 16.40 155 26.70 610 1 6.5 1700 RFI

KEANAKOLU KKU 19 53.39 155 20.58 1863 1 4.8 2380 RF7

KIPUKA NENE KPN 19 20.10 155 17.40 924 3 1.34

KOHALA KOH 20 7.69 155 46.77 1166 1 1.5 2380 RF2

MAUNA LOA MLO 19 29.80 155 23.30 2010 1 6.5 1360

MAUNA LOA X MLX 19 27.60 155 20.70 1475 3 1.34

MAKAOPUHI MPR 19 22.07 155 9.85 881 1 5.7 2720 RF5

MOKUAWEOWEO MOK 19 29.28 155 35.98 4104 1 6.5 2040 RF3

MOUNTAIN VIEW MTV 19 30.25 155 3.75 409 1 6.2 680 RF8

NORTH PIT NPT 19 24.90 155 17.00 1115 3 1.34

OUTLET OTL 19 23.38 155 16.94 1038 3 5.0

PUll HULUHULU PHH 19 22.45 155 12.66 988 3

PUll HONUAULA PHO 19 28.90 154 53.40 215 1 6.5 2720 RFI

PUU PILI PPL 19 9.50 155 27.87 35 1 4.4 1360 RFll

SOUTH POINT SPT 18 58.91 155 39.92 244 1 7.8 2040 RF7

WAHAULA WHA 19 19.90 155 2.92 29 1 6.0 680 RF9

WALDRON LEDGE WLG 19 25.49 155 15.69 1067 3

OPTICAL SEISMOGRAPHS

HALEAKALA Z HAL 20 46.00 156 15.00 2090 3 0.71

HALEAKALA EW HAE 20 46.00 156 15.00 2090 0 1.0 Wood-Anderson

HALEAKALA NS HAN 20 46.00 156 15.00 2090 0 1.0 Wood-Anderson

HILO Z HIt 19 43.20 155 5.30 20 3 1.0

HILO EW HIE 19 43.20 155 5.30 20 0 1.0 Wood-Anderson

HILO NS HIN 19 43.20 155 5.30 20 0 1.0 Wood-Anderson

KEALAKEKUA Z KLK 19 31.20 155 55.30 505 2 1.0

KEALAKEKUA EW KLE 19 31.20 155 55.30 505 2 0.34

KEALAKEKUA NS KLN 19 31.20 155 55.30 505 2 0.34

KIPAPA KIP 21 25.40 158 .90 76 3 0.56

UWEKAHUNA Z UWE 19 25.40 155 17.60 1240 3 0.7

UWEKAHUNA Z USZ 19 25.40 155 17.60 1240 4 1.0

UWEKAHUNA EW USE 19 25.40 155 17.60 1240 4 1.0

UWEKAHUNA PEZ 19 25.4b 155 17.60 1240 15-90 Press Ewing UWEKAHUNA PEE 19 25.40 155 17.60 1240

UWEKAHUNA PEN 19 25.40 155 17.60 1240

38
10 5

Period (sec)

Z I 0.5 0.2 0.1 0.05 0.02 0.01

10~

c:

0

...

c

10 u 4

....

c: 3

0-

C 2 2

10 3

0.01 0.-1 I 10

Frequency (Hz)

100 1000

Figure 2.--System response curves for the Wood-Anderson torsion

seismograph and for the four different types of seismometeramplifier (or galvanometer) combinations in use by the

Hawaiian Volcano Observatory.

39
Table 5.--Seismic Instrumentation Types

Type 1. Consists of:

a) EV-17 - Electrotech EV-17 1.0 sec. period moving magnet

vertical component seismometer or horizontal

component adjusted for an output of 0.5 volts/cm/

sec and 0.8 critically damped.

b) Preamp/VeO - Develco Model 6202 voltage controlled oscillator

or a USGS/NCER Model JE202. 3 db points for bandpass

filter at 0.1 Hz and 30 Hz. Signals are transmitted

on audio FM carrier over cable or FM radio link to HVO.

Type 2. Consists of:

a) EV-17 - Electrotech EV-17 1.0 sec. period moving magnet

vertical or horizontal component seismometer.

b) 3.5 Hz galvanometer with appropriate shunt resistances for

critical damping. System is poorly calibrated.

Type 3. Consists of:

a) EV-17 Electrotech EV-17 (as described above), Hall-Sears HS-IO

0.5 sec. period moving coil seismometer or Observatorybuilt 0.8 sec. period moving coil seismometer with

°HVO-built solid state seismic preamplifier (voltage

gain, 200X) , direct signal transmission over cable'to

HVO and HVO-built solid state amplifier and galvanometer

driver, or Observatory-built electromagnetic seismometer

with 2 Hz galvanometer. Peak magnification approximately

4q,OOO at 4 Hz.

Type 4. Consists of:

Sprengnether short period vertical and horizontal seismometers

(E-W) with 1.5 sec. galvanometers, co~pling factor = .0.25, 2X critically damped. Peak magnification

approximately lS00X at 2 Hz.

Experimental type amplifier systems are not given type numbers.

40
TILTING OF THE GROUND AROUND KILAUEA CALDERA

Tilting of the ground around the summit of Kilauea is monitored

daily by a short-base water-tube tiltmeter in the Uwekahuna Vault, and

at irregular intervals it is measured on a regional scale by means of

a network of field tilt-bases and a portable water-tube tiltmeter. The

attitude of the ground surface at each tilt-base is reported in terms

of north-south and east-west tilt coordinates. Both coordinates at

each station were arbitrarily set equal to 500 when measurements at that

station were begun. Increasing tilt coordinates correspond to northward

and eastward tilting of the earth's surface; that is, to a relative subsidence toward the north and east. A one-unit change in coordinate

corresponds to a tilting of 1 microradian (1 rom per km) in the direction

indicated.

Location of and essential data on each ti1tmeter station are

listed in Table 7, Summary 65.

Table 6.--Tilt Coordinates at Uwekahuna,

April, May, and June- 1972

Date N-S E-W Date N-S E-W

April 2 728 326 June 4 728 330

9 727 327 11 728 330

16 727 329 18 728 333

23 727 330 25 729 329

~y 7 726 329

14 726 331

21 727 333

28 728 332

41
Table 7.--Tilt coordinates and changes at bases around Kilauea caldera. (See fig

-6 Rate (10 rad/mo)

Tilt base Date Tilt Coordinates and direction of 

(1972) N-S E-W tilting since 

last reading 

Uwekahuna (U on fig 5 Jun 750.8 350.7 0.99 S76.0oE 

Tree Molds (TM) 5 Jun 583.0 482.8 0.36 S14.0oE 

Sand Spit (ss) 6Jun 1040.6 721.9 1.76 

Mehana (M) 5 Jun 610.2 600.9 0.34 N39.8°E 

Keamoku (Kea) 8Jun 793.5 218.7 1.79 rJ79.0oE 

+:'

N Ahua Kamokukolau (Kfu11) 6Jun 357.3 542.8 4.02 N 8.1°E 

Kipuka Nene (KN) 7Jun 278.3 499.4 0.45 .3°W 

Hilina Pali (HP) 7Jun 456.8 489.0 1.08 N59.7°W 

Kapapala Ranch (Kap) 8Jun 479.8 520.1 0.45 S38.7°W 
cr

o

o

Kap

/

'KN

HP

2000~

5 K M

N

r

Figure 3.--Tilting of the ground around Kilauea Caldera. The vector

depicting tilting at a given tilt base points in the direction of

'maximum relative subsidence, and its length is proportional to the

rate of tilting during the measurement interval. Closed circles

represent field tilt bases; open circles, short-base watertube

tiltmeters. See Table 7 for explanation of abbreviations.

43
REFERENCE CITED

Hamilton, R. M., B. E. Smith, J. C. Hall, and J. H. Healy, 1969,

Summary of seismic activity in the Pahute Mesa area, Nevada

Test Site, December 1968 - June 30, 1969: U. S. Atomic Energy

Corom. (USGS0474-58): Springfield, Va., Clearinghouse for

Federal Sci. and Tech. 1nf., 63 p.

44 -tr GPO 693.014

UNITED STATES

DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY

HAWAIIAN VOLCANO OBSERVATORY

SUMMARY 67

July, August, and September 1972

By

John D. Unger*, Robert Y. Koyanagi,

and Arnold T. Okamura

Summary of Eruptive Events

By

Donald W. Peterson

OBSERVATORY STAFF

Geology

R. L. Christiansen

R. T. Holcomb

D. W. Peterson (Scientist-in-Charge)

R. I. Tilling

Geophysics

K. T. Honma

George Kojima

R. Y. Koyanagi

A. T. Okamura

J. D. Unger

c. J. Zablocki

Geochemistry

R. T. Okamura

Support

J. C. Forbes

W. H. Francis

M. S. Onouye (Mrs.)

M. K. Sako

Akira Yamamoto

*u. S. Geological Survey National Center, Reston, Virginia
CONTENTS

Summary of Eruptive Events • .

Seismic Summary

Page

1

2

Tilting of the ground around Kilauea Caldera • •

Reference

Illustrations

. . . . . . .

26

27

Figure 1.

2.

Table 1.

2.

3.

4.

5.

6.

Epicenter map

Response curve for System II, EV-17, Teledyne

seismic preamplifier • • • • • • • •

Tables

Number of earthquakes and minutes of temor

Summary of seismic events •

List of felt earthquakes

u.S. Geological Survey seismograph stations

in Hawaii • • . •

Seismic instrumentation

Tilt coordinates at Uwekahuna

iii

23

25

3

8

21

22

24

26
Summary of Eruptive Events

Eruptive activity continued at Mauna Ulu and Alae on Kilauea's

upper east rift zone throughout this quarter. The level of an active

lava lake, approximately 80 by 150 m, in Mauna Ulu's summit crater

fluctuated from 30 to 50 m below the crater rim. Lava normally entered

the lake at its east end, and surface circulation in the lake generally

was from east to west, although sometimes the circulation reversed

and/or varied in complex ways. Low lava fountains (2 to 10 m high)

commonly played on the lake surface, generally along its margins, but

occasionally also in its central portions. The fountains developed

and operated over areas where lava was descending into the depths of

the lake in downward conve~tive circulation. At times, two to four

fountains at fixed locations on various parts of the lake, would operate

steadily for several days with little change; at other times, the

fountains continually shifted in location and number, with as many as

a dozen active simultaneously.

An elongated trench or fissure trough extended ENE from the main

crater. The combined length of the crater and· trench was about 500 m,

and maximum width was about 100 m. A septum about 10 m below the rim

separated the main crater, containing the lava lake, from the trench.

The major vent feeding the entire system was about 170 m east of the

septum on the floor of the trench near its south wall. The crusted

floor of the trench was actually a roof over a large lava-tube system

through which lava flowed from the vent westward to feed the lava lake

and eastward to ultimately emerge at Alae. Most of the time, the

crusted floor of the trench blocked direct viewing of near-vent activity,

but collapse of parts of the floor in September revealed the nature of

the flow pattern.

The vent at Alae persistently fed lava into a multi-compartment

lake at the summit of the lava shield growing over the site of former

Alae Crater. Frequent lava overflows across the levees impounding the

lake added height and breadth to the shield. But the lava lake was

also being drained from below by lava tubes. One tube system fed flows

that had been spilling into Makaopuhi Crater since June 20. These flows

continued to fill Makaopuhi until about mid-August, and by the time they

ended the western floor had been raised to within about 6 m of the

eastern mezzanine. Meanwhile, from August 7 to 10, large and sustained

rockfall flurries from the north and south walls of Makaopuhi's west

pit appreciably modified its walls and floor. On August 9 and 10 lava

was observed to erupt from an ENE-trending fissure on Makaopuhi's east

pit; this brief outbreak may have begun as early as August 7.

As the inflow into Makaopuhi gradually waned and finally stopped,

flows toward the southeast from Alae increased, and a new system of

lava tubes developed. Tube-fed flows advanced southward and eastward

beyond the earlier margins of the lava field, and eruption-caused fires

devastated several thousand acres of forest. Much of Naulu Forest, the

locality of many rare species of trees and shrubs, was overrun by lava.

1
On August 14 the front of the new flow descended Po1iokeawe Pali, on

August 15 it reached the base of Holei Pali, and by August 23 lava

had advanced across the coastal flats and spilled into the ocean at

Kaena Point. Lava continued to pour into the sea along a 2 km-wide

front between Kaena Point and Kealakomo for the remainder of the

quarter, and broad stretches of the coastal flat between the pali and

the shore were covered by these tube-fed pahoehoe flows.

SEISMIC SUMMARY

Events recorded by the U. S. Geological Survey seismograph network

in Hawaii fall into two categories:

1) Local earthquakes and tremor originating in the region of the

Hawaiian Islands (usually within 100 km of at least one

seismograph),

2) Distant earthquakes originating more than 3,000 km from Hawaii.

As an index of seismic activity at Hawaiian volcanoes, daily counts of

earthquakes and minutes of tremor recorded by seismographs in Hawaii

are listed in Table 1. The earthquakes are separated in groups on the

basis of region of origin as determined by the analysis of records

obtained daily at the Observatory (UWE, MLO, MLX, AHU, DES, NPT, WPT,

MPH, Rl10, OTL).

Computer locations of well-recorded events are listed in Table 2.

The location of each seismograph station is listed in Table 4, along

with a description of the equipment at each station.

2
Table l.--Number of earthquakes and minutes of tremor recorded on seismographs around Kilauea

Tremor is separated into three categories: Deep, Intermedi~te, and Shallow, on the basis of relative

~~plitude on seismographs in the summit region. Unless otherwise stated, tremor is presumed to be

associated with movement of magma within the central complex of Kilauea Volcano.

Earthquake categories are: Kilauea Summit 30 km, earthquakes from a source about 30 km beneath the

summit region; Kilauea SUmmit long-period, earthquakes characterized by low-frequency waves that

originate roughly 5 Jan beneath the sununit region; Kilauea Sununit Shallow, carthC}unkcs n few km

deep in the caldera region; SW llift and Kaoiki, oarthquakes along the southwest rift zone of

Kilauea and the adjacent portions of the Kaoiki fault system; Upper East Rift, earthquakes from the

upper east rift zone and the adjacent fault systems of Kilauea's south flank; Koae, earthquakes

along the mortheast-trending Koae fault system south of the caldera; Lower East Rift, earthquakes

from the lower east rift zone of Kilauea; Offshore Puu Pili, offshore earthquakes mostly southeast

of Puu Pili (PPL) station.

Tremor Earthquakes (m • minutes

Date h • hours) Kilauea Summit (1972)

SW rift Upper Lower Offshore

Inter- Long and east east Puu

Deep mediate Shallow 30KM Period Shallow Kaoiki rift Koae rift Pili Remarks

I

Jul 1 ~~+J 1 186 326 47 135 7 3

2 0 3 125 241 20 98 9 6 1

3 arE 129 357 38 101 8 2 3

4 lam H

o+.> 2 93 269 21 61 5 2 3

5 m~..c: 1 150 254 34 58 .7 2 2

6 5m +.>

H H +'

s:: 1 178 271 16 60 12 161 3

7 20m +.> 0 50 604 29 105 11 3 11

8 s

> Q) Q) 1 34 718 25 73 5 4 4

9 Q) .Q

M H +.> 22 567 15 70 5 4

10 Q)

:J 0.. +.> 2 187 269 22 37 13 1 1

11 3 ~6 17 483 10 57 2 2 1

12 3 163 230 36 30 12 6 1

13 11m 1 85 352 10 46 3 2 4

14 2 69 340 20 46 7 1 37

15 1 79 277 29 114 8 7

16 1 24 418 18 72 10

17 1<) 372 16 24 11 2Z7

18 45 372 14 42- 14 81

19 35 331 9 52 17 7 104

20 4 30 317 13 J~ 11 4 ·188

21 40 370 13 37 19 2 20

22 63 401 12 33 15 2 21

23 23 203 22 47 8 17

24 4 147 303 30 39 5 2 ?

25 7m 284 322 12 46 5 1 19

26 5

m 1 178 383 22 43 9 3 7

Z7 24 175 13 49 2 4 9

28 7m 64 135 26 68 7 1 4

29 sm 1 31 136 26 21 3 7 3

30 135 183 21 27 6 5 ?

31 31 346 10 134 17 3 2

3
Tremor Earthquakes (m • minutes

Date h • hours) Kilauea Summit (1972 )

SW rift Upper Lower Offshore

Inter- Long and east east Puu

Deep mediate Shallow .30KM Period Shalloy Kaoiki rift Koae rift Pili Remarks

Aug 1 f-i+> 1 55 324 33 45 5 4 3 2 10ID oe.--. s 0'; rs::: 24 340 2 55 4 2 2

3 (l)f-i+J

H 5=: 2 46 268 31 33 6 .3

4 +J+JO(f) S 1 27 344 8 72 9 2 2

5 (l) ttl +J(])(]) 1 15 340 7 41- 8 ? 6 ttl ,.r;: HH+J 1 48 408 38 70111 4 2

7 (l) (]) '"d 0.. +> '77 2Cf7 48 178?1-.1 7

8 13m g 1 19 241 6 35L..? 14 1

9 o (l) bD 19 239 15 284? 8

10 +>~:;j

+=> 0 8 251 7 270? 10 1

11 (jtl 1~~.8 1 2.3 364 6 156? 7

12 HO+>

i , 7 325 3 651? 3 1

1.3 1 29 333 34 78? 25

14 18 316 31 4D? 14

15 11 258 12 38? 3 5

16 19 224 8 76? 7 5

17 7m 32 245 5 52? 7

28 1 19? .305 12 31? 3?

19 6ID 2 22 298 .36 71? 7

20 1 93 408 64? 75? 6

21 132 298 661 30 7

212 5m 1 12 246 7? 24 8 1

23 5 295 791 39 7

24- 2 15 271 21 30 11 3

25 31 253 39 24 3 2 1

26 7 283 26 Zl 16 5 2

27 ISm 1 48 271 23 23 3 5

28 4ID 6 221 32 Z7 4 2 2

29 .3 10 271 'Zl 31 14 1 .3

30 2 11 273 12 43 10 1

31 1 30 210 49? 20 S 1

!/Heavy rockfall activity at Makaopuhi Crater. Upper East Rift count for Aug 6-20 include

rockfalls.

4
I Tremor

(m - minutes Earthquakes

Date h • hours) Kilauea SUIlUIO..t (1972)

SW rift Upper Lower Offshore

Inter- Long and east east Puu

Deep mediate Shallow 30KM Period Sl~ow Kaoiki rift Koae rift Pili Remarks

I

Sep 1 ~t1 26 264 24 .34 3 1 1

2 lorn ;:j 1 IS 229 8 16 1 4

3 s:: 0

orE 1 9 252 17 21 8

4 56M Sm H 30 24l 36 78 14 1 ?

5 ? ~~ 18 270 25 51 10 1 183

6 Q) OM rc:

HH-t-' 4 150 30 15 6 1 251

7 35m s::

0 33 368 27 34 6 3 Z7

8 11m a1~EI 41 317 17 23 7 3 12

9 > (1) (1) (1) ..q 2 16 340 17 37 5 1 12

10 riM+'

:;I (1) 13 324 27 96 6 4 o B:~ ~::So

11 2 17 373 19 49 13 3 5 12 1ill 1 21 308 11 52 14 2

13 oam? Sm 18 298 15 56 10 2 .3 14 15m 7 54 234 20 35 5 4 1 15 1 52 261 24 38 8 5 3 16 lOrn 1 25" 207 18 33 6 8 2 17 gm 40 2~ 12 22 2 3 18 10m 49 305 13 29 12 1 1

19 3m 36 276 26 23 11 3 20 ~zn 3m 47 290 18 25 5 2

21 1 53 252 37 43 10 18

22 ~()1ll 4 26 324 12 36 1 5 4 23 5

m 7 369 17 29 5 1 2

24 10m 1 20 253 15 12 8 2

25 51 322 44 24 3 3 2 26 4 23 425 50 27 13 1 3

Z7 10 351 35 22 11 3 28 22 473 39 35 13 2 2

29 5

m 2 34 372 26 25 13 1

30 1 15 329 23 26 14 7

5
Table 2 is a chronological listing of successfully located earthquakes. For each event the following data are presented:

Origin time in Hawaiian Standard Time: date, hour (HR), minute (MN),

and second (SEC).

Epicenter in degrees and minutes of North latitude (LAT N) and

West longitude (LONG W). Poor convergence of the epicenter solution

is indicated by"?".

Depth - depth of focus in km. Assumed depth is indicated by "*".

Mag - magnitude, if determined.

NO - number of stations used in locating earthquakes.

GAP - largest azimuthal separation in degrees between stations.

DMIN - epicentral distance in km to the nearest station.

ERT standard error of the origin time in seconds.

ERR - standard error of the epicenter in km.

ERZ - standard error of the depth in km.

MD - mean deviation of the time residuals. [= 2 INO ] 1/2 where

Ri is the observed seismic wave arrival time less the computed time at the i th station.

Q - solution quality of the hypocenter. This measure is

intended to indicate the general reliability of each

solution:

.Q Epicenter Focal Depth

A excellent good

B good fair

C fair poor

D poor poor

Q is based both on the nature of the station distribution with respect

to the earthquake and the st~tistical measures of the solution. These two

factors are each rated independently according to the following scheme:

6
Station Distribution

NO GAP DMIN

A > 8 < 1200 < DEPTH or 5km

B > 6 < 1500 < 2 x DEPTH or 10 km

C > 6 < 225 0 < 50 km

> 4 < 1800

D Others

Statistical Measures

ERH(km) ERZ(km) MD(sec) RMAX(sec)*

A < 1.0 < 2.0 < 0.10 < 0.25

B < 2.5 < 5.0 < 0.20 < 0.50

C < 5.0 < 0.30 < 0.75

D Others

Q is taken as the average of the ratings from the two schemes, that

is, an A and a C yield a B, and two B's yield a B. When the two

ratings are only one level apart the lower one is used, that is,

an A and a B yield a B (Hamilton and others, 1969).

The criteria for Q are the same as used by the Office of Earthquake

Research and Crustal Studies, U. S. Geological Survey.

*RMAX is the maximum residual

7
Table 2. Summary of Seismic Events

1972 Hri MN SEC LAT N LONG W DEPTH t-1AG NO GAP DMIN ERT ERH ERZ Mf) (J

JUL 1 1 49 3A.1 19-20.0 155-13.4 A.O· 1.13 12 1~7 6.3 o.o~ 0.1 f) • 11 C 1 3 16 12.4 19-21.2 155-1~.3 32.7 2.1 11 128 2.4 0.16 0.9 1.5 O.tl9 R 1 3 24 43.9 19-25.4 15~-24.1 A.O* 2.0 lq 94 7.3 0.06 0.5 0.17 'i

1 14 26 18.5 19-15.5 155-?2.3 6.0 13 16H 1.9 O.lfi 1.4- 1.2 0.24 C 1 15 56 32.0 19-19.6 155- 7.7 1.2 16 175 5.9 2.70 1.3 10.3 0.23 C

1 11 50 43.3 19-19.7 155-15.q ';;;.1 15 169 2.8 0.12 O.A 0.6 0.13 C

1 19 4 2A.l 18-53.9 155-11.7 12.9· 17 263 40.4 0.42 2.8 0.14 0 1 23 46 26.0 19-1A.O 15~-23.q 1+.0 1.6 14 12., 4.2 O.O~ 0.6 0.1 0.13 H

2 '7 5 4.1 19-1Q.O 15~- 1.9 3.4 1.9 14 laS 6.7 0.22 1.6 1.6 0.24 C

2 1 46 2A.4 1~-15.3 ISS-???? 0.0 13 112 8.0 9.46 ! .3 18.1 O.~4 C

2 8 35 9.7 19-17.4 155-31.4 8.0· 1.5 10 ?20 22.2 0.45 3.3 u.~1 C 2 9 0 3.6 19-19.4 1~~-lO.7 8.0* .14 113 5.1 0.10 0.9 0.12 C 2 19 53 12.0 19-21.5 15~-1~.A 25.3 2.1 18 80 3.6 0.13 o.e 1.4 O.ll Ei

l 20 0 12.1 lQ-20.6 155-14.4 8.7 1.7 10 2Jh 4.2 0.36 2.0 2.2 0.10 C

3 2 45 7.4- 19-45.0 155- 1.4? 48.9 3.1 14 220 21.6 0.54 i.2 4.5 ,0.10 C

3 3 20 51 .5 19-20.3 155- 6.81 8.0* 2.3 13 161 6.3 0.14 1.4 0.22 C

3 5 42 1.6 19-50.2 155-50.9 0.1 1.3 21 C:!7~ 5J.2 0.63 4.0 1. 1 u.16 ()

3 5 57 17.5 19-1fl.1 1~5-2'J.f; 3.5 2.2 14 117 5.2 0.16 1.2 1.5 0.;>4 C

3 10 15 13.3 19-2t:!.8 1~5-26.2? 0.0 14 138 7.0 9.21 1 • 1 11.~ 0.26 C

3 10 41 41.0 19-19.5 1~5-25.8 5.3 12 126 4.5 0.12 1.0 1.2 0.19 R

3 16 9 39.3 19-19.1 15~-1].7 2.3 2.0 22 114 b.4 u.18 1.0 1.5 O.2h C

3 20 28 7.9 19-19.2 l!)~- 8.8 1.4 1.A II 17~ .., 1.33 1.0 4.9 0.23 C

4 7 20 56.6 19-19.9 155-24.5 7.1 1.8 21 101 ~.l O.o~ O.A 0.6 0.20 R

4 15 19 1.4 19-23.~ 1bS- 1.0? A.()* 11 150 7.9 0.15 1.3 0.17 C

4 Ib 44 1.0 19-20.1 155-13.1 A.O" 2.0 10 191 6.5 0.15 1.1 0.12 C

4 21 46 49.1 19-19.1 155-11.8 3.6 1.8 21 115 6.4- 0.17 1. 1 1.3 0.2'" C

4 22 59 18.2 19-24.3 155-16.0 11.9 12 89 3.4 a.OM 0.1 O.M 0.12 B

5 0 22 53.1 19-13.0 155-13.2 37.0 15 248 13.2 l>.1 1.6 1.1 0.11 C

5 2 21 36.6 19-12.1 1~5-21.4 40.2 13 1"7 11.K 0.36 1.5 3.1 0.09 C

5 2 35 42.5 19-21.3 '155- 6.4 8.0· 2.4 11 !41 b.t! 0.11 1.2 0.14 C

5 5 10 35.6 19-19.5 15S- A.O 8.0" 13 110 5. "' 0.11 1.0 0.10 C

5 6 6 35." 19-14.4 155-48.l 4.8 2.6 19 13'J 1.1 0.1"7 1.4 1.3 0.21 C 5 7 15 17.6 19-25.8 1~5-.. q.~ A.7 15 241 lA.6 O.2H ~.O 1.5 0.13 C

5 10 1 37.4 19-19.4 1~S-14.1 ~.O* 11 165 b.O 0.11 O.A O.lZ C

5 13 51 4.1 19-23.2 155-26. ~'l 1.9 1.8 12 95 8.U O.O~ 0.7 O.b U.12

5 16 24 10.3 19-20.2 155-)2.7 n.2 1.7 21 141 4.2 0.11 0.8 0.7 0.21 C

5 17 51 32.5 19-20.2 155-13.0 5.8 1.7 18 156 4.t! 0.15 1 • 1 o.~ O.?5 C

5 19 15 52.0 19-23.0 155-25.4 A.O· 9 233 6.4 0.19 1.2 0.09 0

5 21 20 3q.3 19-23.2 155-16.9 11.'1 2.2 13 ,,'+ 0.3 0.15 O.A 1.3 0.10 P

5 23 2 37.1 19-18.1 155-~3.7 3.1 2.4 22 114 4.0 0.06 O.s O.b O.lft A

6 0 22 23.1 19-20.3 155-12.h 3.3 14 190 5.& 0.21 1.2 1.4 o.?l C

6 1 21 2A.3 19-20.5 1~5-13.4 4.6 1.9 14 118 5.6 0.19 1 • 1 1.2 o.?O C

6 2 11 44.6 19-15.2 15~- 0.21 41.0 21 233 <;I.d 0.35 l.A 2.1 0.12 C

6 4 31 o.t) 19-15.3 1~5-22.1 3.1- 1.9 lb 114 1.8 0.13 0.9 1.2 0.19 C

6 5 5 24.2 19-21.1 15~- 1.6 1.7 14 148 4.3 0.10 1.1 O.M 0.13 Fi

6 6 18 38.9 19-20.4 155-12.5 6.2 1'7 154 3.1 0.15 1 .1 1.0 0.24 C

6 9 5 lR.S 19-30.3 155-35.31 7.7 2.4 18 143 2.3 0.10 1.0 1.2 0.15

6 9 c8 33.3 19-23.2 15~-26.1 1.8 1.7 16 11 1.4 0.13 0,7 0.9 0.15 H

b 12 26 7.8 1~-19.0 1~S-13.1 6.6 1.6 14 207 6.1 O.l~ 1 • 1 o.~ O.lA C

6 14 45 10.5 19-31.9 155- A .11 0.0 11 212 A.1 6.33 1.1 12.0 O.ll C

8
SUMMAHY OF SEISMIC EVENTS (rONTI~UEO)

1972 HR MN SEC LAT N LONG 'II DE.PTH MAG NO GAP DMIN ERT ERH Ef~Z MI) n

JUL 6 18 9 3R.1 19-20.3 155- ~.O ~.5 1.8 21 162 4.5 0.14 1.0 0.8 0.21 C

6 23 51 26.1 19-19.2 l~S- 9.4 3.2 14 179 S.c. 0.20 1.3 1.5 0.23 C 1 0 SO 14.9 19-25.7 155-25.1 1.5 1.9 23 b5 8.2 0.09 0.6 0.6 0.17 C

1 8 40 53.5 19-22.9 155-;5.6 ".00 10 264 6.5 0.15 O.R 0.05 0

7 13 46 50.3 19-25.2 155-21.q Ib.3 q 14H 4.7 0.96 J.l 10.0 U.1~ C

7 19 22 18.6 19-23.7 1~~-23.61 7.9 1.4 20 55 6.4 0.06 0.6 0.4 0.14 A

7 22 56 24.6 19-17.9 155-14.6 13.6 0.5 8 ?25 6.4 0.29 1 • 'i 2.2 O.OH C

7 23 25 13.3 19- 4.6 155- 2.~ 15.4· 1.1 17 2~1 34t.A 0.45 3.0 0.24 0

8 4 11 21.8 19-19.3 155-14.5 8.0· 0.9 17 145 5.2 0.07 U.6 0.11 C

8 6 15 41.9 19-18.5 15S-13.1 5.4 1.5 21 lS~ 7.4 0.14 \).9 0.9 0.22 C

8 13 15 4Q.2 19-24.6 15S-l~i.91 ~.4 1.3 22 5'1 7.') 0.07 O.ft O.~ o. 1C; R

a 16 32 33.8 19-20.5 1~~-12.2 A.O" 9 192 5.1 0.25 1.9 0.20 C 8 17 25 27.0 19-20.1 1515-11.6.1 1.3 0.1 13 162 4.5 0.14 1. 1 1.13 0.14 C A 19 3 51.2 19-20.6 1~~-13.3 6.2 1.8 21 14H j.~ 0.10 O.A 0.7 O.?l C 9 0 2 2(,.6 19-18.6 155-1S.0 11.5 0.3 10 ~O6 b.l 0.18 o•., l.'j 0.06 H

9 2 49 23.0 19-19.7 1~5- 9.0 6.3 0.2 12 111 4.6 0.16 1.2 o.q 0.11 C 9 7 29 36.4 19-18.7 155-13.6 8.0* 0.6 12 l"7H 7.1 0.115 1.1 0.16 C 9 13 19 3"J.l 18-52.2 lS5-1~.4 ~.O* l~ 263 44.8 0.51 .3.5 0.14 0 9 IS 33 0.8 19-20.8 155- 9.A 5.2 0.9 13 153 2.4 0.14 1 • 1 1.0 0.11 C 9 15 51 27.1 19-19.6 155-1J.7 5.~ 0.9 Ib 194 ~.5 0.19 1 • 1 0.9 O.l~ C

9 20 1 46.0 19-17.9 15~-14.2 13.2 0.8 8 226 6.9 O.2H 1.0 2.? 0.05 C 9 20 24 26.5 19-22.3 155-29.4 S.b 0.9 18 90 11.4 o.OY 0.1 0.8 0.1f, C 9 23 S2 42.3 19-23.6 155-25.2 8.0* 0.9 11 224 7.• 2 O.3~ 2.0 0.11 C 10 1 58 1~.6 19-20.4 155-13.0 5.7 0.9 18 lR6 J.A 0.15 1.0 0.1 0.20 C 10 20 17 55.6 19-19.0 1~5-15.3 9.1 2.0 12 243 4.3 0.49 2.4 2.8 0.10 C

11 1 19 115.0 19-19.4 15~-15.5 6.2 1.9 13 lA2 3.ft 0.11 1 • 1 o.~ o.IA C 11 8 1 41.2 19-20.8 1~5-?4.4 7.8 1.Q 18 t\9 2.2 0.08 U.7 O.£, 0.11 11 9 6 3A.5 lq-19.2 lS~-13.1 A.O* 0.8 10 203 6.1 0.14 1.1, 0.12 C 11 12 35 31.3 19-20.0 15~-lO.8 9.6 0.8 14 164 4.1 0.11 o.~ l.r; 0.1u C 11 19 26 5·' .2 19-22.5 155-43.1 6.5 0.7 11 262 17.6 0.59 3.5 0.'1 0.09 0

11 20 25 18.3 19-19.6 155-13.9 8.0· 0.8 14 162 6.2 O.OR 0.6 0.10 C 11 22 4 53.9 19-20.3 155-12.3 8.0* 0.0 12 156 1.4 0.13 1.1 O.IA C 12 ,. 8 52.7 19-22.4 15~-?5.2 4.0 1.4 17 q3 5.3 0.14 O.Q 1.2 0.20

12 6 50 1.6 19-23.9 15!)-i?4.3 8.0· 0.8 13 131 7.1 0.06 0.5 O.t)~ C 12 20 31 49.0 19-21.9 1~5-?4.51 6.2 3.3 26 50 3.7 0.07 0.8 1.4 o.?? H

12 20 3~ 51.3 19-22.1 155-24.6 8.2 1.6 10 130 4.1 0.07 O.f\ 1.7 O.OQ 14 12 23 3 43.8 19-19.3 155-16.1 30.1 2.7 23 141 2.8 0.18 1 • 1 1.~ 0.14 13 0 42 1.6 19-24.8 I~S-25.5 3.1 2.1 20 75 9.3 0.10 0.7 1.0 O.l~ I~

13 5 54 39.4 19-19.1 155-11t.l 11.1 12 2)5 6.1 0.31 1.6 2.4 0.11 C 13 7 35 24.1 19-19.2 155-14.1 4.0 1.6 15 Ib8 6.1 0.20 1.~ 1.8 0.26 C

13 16 46 10.5 19-22.5 155-23.4 ~.4 11 152 4.2 0.10 0.'; O.A 0.12 C 13 1'7 10 3.4 19-19.3 155- H.9? 0.4 I? l"~ 5.3 2.74 I.S 10.4 0.21 C 13 18 59 11 .9 19-19.8 1~5-12.J H.O" q 208 6.0 0.11 0.«:1 o.oq C 13 20 52 42.0 1~-19.0 155-13.0 d.O* 1.6 11 ?15 1.~ 0.21 1.4 0.11 C 13 21 12 4.5 19-19.7 155-1".6 10.0 1. 9 ?05 1.6 0.15 0.7 1 • 1 0.03 fi

13 22 17 1.2 19-19.6 155-16.6 'Q.9 1.5 9 206 1.7 0.12 0.6 0.9 0.03 R 14 8 39 11.6 19-19.1 155-13.5 R.O· 13 172 1.2 O.I~ \l.A 0.1i.' C 14 9 36 51.5 19- 0.4 15S-19.0 31.5 4.5 26 2t!ti 22.9 0.30 1.1 2.6 0.13 C 14 '9 40 16.7 19- 0.4 15~-le.s 29.6 2.9 21 229 l3.6 0.36 1.9 3.1 0.13 C 14 11 32 38.8 19-19.9 155-45.7 A.I 2.6 15 22M 17.7 0.26 1.6 1 • '1 U.14 C

9
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HH MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN fHT t:HH fRl Mfl Q

JUL 14 18 50 30.8 18-45.6 154-~2.9 21.9· 3.4 21 ?~A 65.7 0.32 t.!.3 0.17 f'

14 21 23 ..5.4 19-24.3 155-t'4.4 6.3 1 ~~ 172 7.8 0.11 0.7 0.1 0.\3 C

14 22 30 3.1 19-16.8 1~b-24.4 13.8· ~.3 28 300 74.8 0.21 2.0 O.?1 n

14 22 42 27.4 19-22.0 155-113.5 1.4 9 79 3.8 O.O~ 0.4- O.S 0.10 A

14 23 24 SR.3 19-20.3 155-1J.Q 1.5 1.5 20 151 4.& 0.12 0.9 O.f, 0.21 C

15 1 53 5.5 19-32.0 155-42.11 5.3 2.5 14 156 11.9 0.72 1.2 5.4 0.14 C

15 10 15 57.6 19-19.2 15S-10.A 2.1 1.8 21 175 5.6 0.20 1. 1 I.S 0.21 C

15 11 21 35.6 19-24.8 1~~-?5.~ 0.4- 1.7 17 75 9.5 O.~O 0.7 1.0 0.19 t:'

15 14 49 24.6 19-18.3 15~-12.1 2.1 2.9 25 154 7.7 0.18 0.9 1.3 O.2f\ C

15 15 1 49.7 19-19.9 1~5-12.1 6.8 2.7 23 145 1+.8 0.11 0.8 0.6 0.20 C

15 16 58 1.6 19-24.6 15S-1b.4 0.5 1.0 8 A9 1.t! 0.14 0.4 0.4 0.09 A

15 22 17 55.9 19-25.5 15')-20.0 10.9 1.4 18 91 3.4 0.05 O.S o.s O.O~ A Ib 1 11 6.2 19-19.3 15';-25.4 12.6 2.3 11 165 4.0 0.20 1.5 1.4 0.16 C

16 9 47 49.2 20- 3.4 15~-28.8 25.1 2.3 24 212 23.4 0.30 1.8 3.9 0.14 C

16 10 51 50.0 19-19.6 155-16.6 9.7 9 208 l.A 0.15 0.7 1 • 1 0.04 e

16 11 46 3Q.4 19-18.9 155-15.6 Q.1 1.9 14 1"7 3.9 0.09 lI.f, 1.1 0.07

16 13 33 11.2 19-19.9 1~5-11.4 9.2 1.2 12 182 4.9 O.Oh 0.6 1.3 0.07 R

Ib 14 1 42.1 19- 0.4 155-18.6 12.7· 1.4 15 229 32.4 0.27 2.0 0.12 II Ib 11 49 4Q.3 19-24.5 155-38.5 40.9* 1.4 7 324 27.7 0.33 3.4 0.06 0

16 20 29 10.6 19-23.8 155-25.6? 1.4 1.4 17 81 7.6 U.10 0.7 0.'3 0.16

16 21 53 50.6 19-19.5 15~~13.H 8.0· 0.4- 11 163 6.4 O.Oq 0.1 u.l1 C

Ib 23 24 46.1 19-24.1 lS5-2~.2 4.6 1.3 20 82 11.2 0.09 O. -, 1.0 0.20 C

17 1 11 5~.4 19-19.3 1~5-14.0 8.0* 9 198 6.2 O.~2 1.6 O.l~ C

17 1 39 23.6 19-19.9 I5S-IS.? 26.3 16 150 3.~ o.lb O.~ 1.S O.O~ 8

17 8 58 54.6 19-22.q 15~-22.0 4.7 1.0 11 146 4.4- 0.14 0.9 1 .1 0.16 A

17 10 40 12.5 19-23.6 15~-2~.2? A.2 2.1 21 67 7.0 0.08 O.n 0.5 0.14 R

17 10 55 5?5 19-1Q.2 155- 8.7 A.O· 0.7 11 1li1 S.A 0.14 1.2 0.13 C

17 11 51 19.0 19- 2.5 155-25.1 32.4 12 220 13.7 0.22 2.2 2.0 0.12 C

17 11 13 47.5 19-21.2 1~5-16.3 b.O 10 132 2.4 0.11 0.(, 0.7 0.11 A

11 20 I-' 23.0 18-54.1 155-16.2 ~.6 3.1 24 250 35.0 0.42 ~.o 2.6 O.l~ C

17 20 31 3f,.6 18-52.6 155-15.6 6.4 2.0 13 2&8 31.9 2.?6 3.9 12.3 0.J4 0

17 20 58 54.6 18-55.9 15b-11.4? 12.3 2.8 15 248 31.1 0.36 2.1 2.H 0.11 C

17 22 11 15.9 18-51.3 155-16.2 1.8 3.3 21 ~~9 39.3 0.46 3.0 2.1 0.17 0

11 2::1 lq 19.9 18-50.8 1~5-17.S 1.4· ?3 12 260 39.0 0.38 2.5 u.14 0

17 23 51 3.0 18-51.1 155-11.8 4.1 2.2 16 25Q 38.3 1.01 2.1 6.4 0.11 0

18 0 3 39.3 18-52.1 155-18.0 Q.2 ?9 16 ?5b 36.4 0.57 2.7 3.1 0.13 D

18 0 17 7.2 18-54.4 155-19.1 8.7 3.1 18 t!4b 31.8 O.2~ 2.0 2.5 O.ln C

18 0 34 16.1 18-53.1 155-18.8 10.1 2.Q 19 252 34.2 0.41 2.0 2.3 0.13 C

18 1 b 3A.6 18-51.0 155-11.9 6.0 ?9 15 259 38.3 l.l~ 2.3 l.ft 0.11 0

18 4 33 50.1 1~-51.3 155-18.1 7.0 ?3 18 ?58 31.7 1.11 2.2 7.5 O. 11 0

18 6 23 38.5 18-50.1 155-17.6 10.8° 2.9 19 260 39.1 0.27 1.8 o. 11 n

18 9 7 3.0 18-53.4 155-19.4 15.5* 3.2 18 ~51 33.2 0.22 1.5 0.14 D

18 9 14 17.2 18-4A.3 155-17.1 A.O· 3.1 19 273 43.4 0.21 1.4 O.in 0

18 19 ~2 41.5 18-51.4 155-18.2 8.0· 9 263 37.5 0.34f. 2.2 0.01 n

18 19 55 5.1 19-18.7 155-13.4 A.O· 0.7 9 218 7.5 0.2·( 1.9 0.1~ C

18 21 29 52.1 19-1Q.6 155-12.0 5.9 2.0 19 16B 5.5 O. l!) 1. 1 1.0 O.~4 C

19 1 57 24.0 19-19.3 155-11.8? 4.a 1.2 19 173 b.2 0.21 1.4 1.4 0.1'1; C

19 6 40 21.9 19-23.6 15!;-23.9 3.6 1.0 15 194 6.4 0.15 O.M 1.2 0.14 C

19 10 40 1.1 19-20.5 155-19.5 4.0 1.1 12 71 3.f\ 0.14 0.4 2.4 O.Oq 8

19 15 19 15.2 19-22.8 155-24.9 8.0· 1.0 11 13b 5.5 0.10 0.9 0.12 C

10
SUMMARY OF SEISMIC EVEN1S (CONTINUED)

1972 HH MN SEC LAT N LONG W O~PTH MAG NO GAP OMIN E~T ERH E~l MI) Q

JUL 19 11 22 32.4 19-20.4 155-.1.4 3.8 ?l 19 If\O ~.2 O.l~ 1 • 1 1 • 1 0.20 C 19 18 55 37.8 IB-S2.7 15~-19.~ ~.9 1.5 13 25~ ::14.3 1.60 3.1 9.~ 0.12 D 19 19 9 9.7 18-54.6 lS5-~1.6 9.k 2.5 262 29.5 0.70 4- .1 3.3 0.10 I)

19 23 22 3].2 19-22.1 155-26.0 7.5 2.8 23 60 5.9 U.l~ 0.8 O.~ 0.20 H 2U 1 20 44.6 19-23.2 155-?1.9? 5.2 o.q 12 92 4.0 0.11 u.7 I.A 0.14 H

20 '+ 56 57.8 19-20.4 15S-13.~ 5.9 1.3 22 150 5.3 0.12 0.9 O.H u.~3 C 20 6 46 4.9 19-18.4 1~5-15.3 11.9 9 206 4.8 0.23 0.9 1.q O.Oh f.l 20 1 3 37.0 18-49.1 1~5-17.21 1.6· 2.6 12 tJ6'j 42.1 0.66 4.3 O.?o 0 20 "1 28 13.2 lA-Sl.2 155-18.2 H.] 2.9 20 2~8 31.H 0.34 2.0 l.q O. 11 C 20 8 7 42.2 19-20.2 155- 9.3 7.0 1.8 If> 22A 3.5 0.40 2.5 1 • 1 U.23 I)

20 12 11 38.~ 18-51.6 155-18.61 9.3 7.9 13 ~fi2 36.~ 0.79 4.0 3.6 0.13 I)

20 13 17 16.3 18-51.7 155-17.41 1.1· 2.6 13 263 31.7 0.52 3.4 0.18 0 20 14 40 59.7 18-51.6 15~-11.1 4.4 3.0 22 i?~7 37.5 1.15 2.4- 7.? 0.14- n 20 15 43 48.8 19-21.5 15~-25."1 1.3 1.5 13 71 4.~ 0.14 1.0 2.1 0.25 A 20 17 20 44.0 18-51.5 155-1M.2 8.0· 2.6 12 211 31.3 0.40 l..6 0.10 n

20 17 25 23.4 18-50. '1 155-11.f, 8.0· 2.6 14 260 39.0 0.21 1.8 0.('\9 I) 20 17 39 50.5 19-25. -, 155-14.1 30.0 3.2 30 39 1.B 0.12 0.1 1.3 0.13 R 20 18 9 31.2 19-1A.4 155-13.6 10.3 1.2 11 221 7.3 0.41 1.9 3.2 0.10 C 20 19 37 52.7 18-51.3 15r;-1~.O 5.0 2.a 16 2~8 37.8 1.40 c.9 9.3 U.13 n 20 19 42 15.1 19-19.4 155-}4.7 ll.q 8 189 4.8 0.34 1.2 2.~ 0.07 C

20 21 50 2.1 18-53.2 155-17.4 8.4 2.5 14- 258 35.2 0.71 3.4 3.7 0.14 n 20 21 54 28.5 19-19.9 155- Cl.O? 4.5 1. 19 168 4.3 0.18 1.3 l.t! 0.26 C 20 23 S9 44.4 18-52.6 155-19.0 8.4- 2.1 15 259 34.9 O.~3 .3.2 3.1 o. 15 ()

21 2 4 q.9 lS-S9.3 15~-19.3 27.1 2.1 22 229 24.1 0.47 2.8 4.7 O.Ie D 21 3 2 55.0 19-20.0 155- ".8 H.O* 1.4 11 16'1 5.1 0.10 0.9 0.1? C

21 4 57 8.1 19-25.3 155-14.4 29.3 ) .2 20 ~8 1.1 0.14 0.9 1.5 0.11 21 7 52 5q.l 19-21.1 155-~4 .1'/ 1.2 2.4- 23 71 2.9 0.07 0.3 1.6 O.?1 H 21 21 27 12.4 19-23.1 155-23.61 7.<J 2.3 25 53 5.3 0.09 0.6 0.7 0.17 H 22 0 43 42.2 19-22.7 155-23.3 8.1 2.7 27 42 4.6 0.08 O.b O.f) O.lfl R 22 3 48 16.5 19-19.9 15~·12.3 8.1 1.6 10 205 1+.7 0.27 1.5 3.1 0.10 C 22 6 24 37.4 19-20.1 155-12.1 7.6 3.1 25 140 4.4 0.09 0.7 0.5 0.17 C 22 11 41 47.4 19-25.8 155-30.0 1.2 1.4 15 112 12.3 1.35 0.8 5.0 0.17 C 22 15 43 3.4 19-22.1 155- 1.5 8.0· 0.5 13 163 4.8 0.24 1.6 0.20 C 22 18 9 35.8 19-16.6 155-13.2 B.D· 7 254 9.8 0.45 2.8 0.11 0 22 19 51 32.2 19-20.8 155-24.1 8.8 1.5 11 155 1.7 0.13 0.8 1.7 0.10 B

23 3 31 30.3 19-24.4 155-17.6 8.4 1.2 12 138 1.9 0.11 0.8 1.2 0.06 B 23 3 33 14.9 19-25.2 155·16.9 5.0 1.1 10 153 4.7 0.30 1.0 2.7 0.12 C 23 5 20 36.1 19·12.0 155-26.3 5.9 1.5 14 153 5.4 0.09 1.3 0.9 0.11 C 23 8 6 21.0 19-17.4 155-12.91 2.1 1.9 14 228 9.3 0.48 2.3 2.1 0.21 0 23 10 11 15.6 19-47.3 155-35.4 13.6* 2.3 13 150 13.8 0.07 0.7 0.09 C

23 10 21 36.9 19-22.2 155-25.51 0.5 14 69 5.4 2.64 0.9 10.0 0.25 C 24 2 12 47.3 19-19.9 155-21.1 0.1 7 lSI 3.9 2.77 1.1 5.8 0.05 C Z4 3 21 24.9 19-12.0 155-26.9 5.0 11 146 4.9 0.20 3.0 1.9 0.23 C 24 7 26 3.9 20- 5.4 155-23.8 8.2 2.9 23 ?26 23.0 0.27 1.8 1.9 0.18 C 24 13 34 49.3 19-51\.3 155- 1.7 59.4 3.2 20 281 28.6 1.53 6.6 10.3 '0.16 0

24 14 10 54.6 19-24.2 155-23.0 9.4 0.3 11 173 5.9 0.17 0.7 2.0 0.09 24 18 45 5.8 19-20.8 155-16.21 2.3* 0.4 10 125 3.0 0.17 1.1 0.25 C 2S 2 31 24.4 19-23.3 155-25.4 8.0· 0.3 9 187 6.8 0.11 0.8 0.08 C 25 10 21 42.4 19-23.2 155-24.9 1.1 2.0 12 133 6.2 0.63 1.1 2.4 0.21 C 25 12 5 6.9 19-19.4 155-13.3 7.0 2.2 17 167 7.2 0.1'7 1.2 0.8 0.22 C

11
SUMMARY OF SEISMIC EVENTS (CONTINUED)

LAT N LONG W DEPTH MAG NO GAP DHIN ERT ERH ERZ MO Q 1972 HH MN SEC

JUL 25 18 39 10.0 19-24.5 155-23.7 6.3 1.5 1-1 191 7.1 0.13 0.9 0.8 0.08 B

26 1 2 40.8 19-10.9 155-30.5 44.4 2.6 23 98 5.2 0.32 1.4 3.0 0.12 8

26 3 31 1.7 19-22.9 155-24.1 8.0· 1.7 9 165 5.2 0.11 0.9 0.12 C

26 8 23 4.0 19-1Q.4 155-19.61 6.1 2.5 18 108 3.2 0.15 1.0 1.Z 0.25 B

26 12 48 32.9 19-26.3 155-23.8 3.6 1.5 11 191 6.5 0.12 0.7 1.1 0.10 C

26 16 51 57.6 19-25.6 155-14.5 29.0 17 128 1.7 0.18 1.0 1.7 0.10 B

26 21 3 22.6 19-21.5 155-25.4 3.0 2.4 24 69 4.4 0.09 0.1 0.9 0.23 B

26 21 4 35.5 19-21.6 155-25.4 5.9 1.6 14 134 4.5 0.14 1.0 1.1 0.19 B

26 22 3 41.1 19- 9.1 155-22.6 40.8 17 178 9.3 0.36 1.5 3.6 0.12 C

27 7 4 44.6 19-20.5 155-20.41 2.3 1.3 8 117 5.1 0.18 0.5 2.5 0.01 B

27 7 23 11 .1 19-20.5 155-13.2 4.7 1.5 14 151 6.6 0.14 1.0 1.3 0.23 C 27 9 16 6.5 19-23.7 155- 3.91 3.9 2.1 14 104 7.2 0.14 1.1 1.1 0.25 C 27 15 26 42.3 19-20.2 155- 8.5 5.7 1.9 18 164 4.1 0.14 1.1 0.9 0.20 C

21 22 25 44.1 19-23.6 155-23.4 5.1 17 151 6.2 0.13 o.a 1.2 0.18 C 28 12 14 8.9 19-19.9 155- 8.6 3.6 2.3 18 168 8.6 0.13 0.8 0.8 0.19 C

28 20 4 52.0 19-22.6 155-24.8 6.2 2.3 22 S2 5.2 0.08 0.6 0.7 0.17 B

28 20 43 32.1 19-19.3 155-13.4 1.3 2.5 23 145 6.0 0.11 0.8 0.6 0.18 R

28 21 8 6.1 19-20.6 1SS-11.1 10.3 10 155 3.5 0.12 0.9 1.8 0.08 8

28 21 8 57.8 19-19.3 155-13.61 7.8 2.0 20 161 6.0 0.08 0.6 0.4 0.12 C

28 21 11 1.8 19-1CJ.l 155-13.51 0.0 16 172 7.1 1.55 1.3 22.0 0.26 C

28 21 43 30.8 19-18.3 155-13.6 5.7 1.8 13 180 11.9 0.16 0.9 0.9 0.11 C

28 23 32 36.0 20- 0.5 IS5-44.5 2.1 2.1 22 147 13.9 0.26 0.9 0.9 0.14 C 29 1 23 24.5 19- 8.1 155-23.01 34.5 13 239 19.8 0.60 2.9 5.1 0.12 0

29 7 29 51.5 19-24.9 155-23.9 2.3 1.4 10 193 7.5 0.14 0.8 1.7 0.11 C 29 8 6 0.7 19-11.9 155"16.1 43.7 10 222 15.4 0.54 2.7 5.0 0.09 C

29 8 6 39.2 19-11.0 155-16.4 41.1 10 210 16.9 1.16 5.0 8.2 0.10 0 29 17 25 36.8 20- 4.1 155-49.1 13.0 3.0 23 212 6.9 0.14 1.9 2.3 0.10 C 29 19 23 38.2 19-20.8 155-13.3 6.3 1.6 17 146 5.5 0.11 0.8 0.8 0.20

29 23 30 2~.0 19-19.5 155-16.1 2.2 1.5 19 150 2.6 0.15 0.9 1.2 0.20 C 30 0 23 26.4 19-20.3 155-13.2 5.4 14 153 6.0 0.17 1.2 1.1 0.24 C

30 0 46 60.0 19-19.9 155-41.3 8.6 3.1 23 122 11.2 0.08 0.8 1.2 0.14 B

30 2 50 1.1 19-30.5 155-15.1 8.0· 10 186 10.3 0.26 1.9 0.24 C

30 4 20 40.1 19-23.4 155-24.9 7.7 2.6 24 4S 6.ft 0.01 0.5 0.5 0.15 B

30 6 48 16.4 19-19.7 155-11.2 2.5 1.6 16 167 5.6 0.21 1.3 2.4 0.28 C

30 8 59 4.1 19-19.6 155-11.9 8.0· 0.3 10 167 8.6 0.09 0.8 0.10 C

30 10 1 15.0 19-19.6 155-24.8 1.9 0.8 9 158 2.9 0.10 0.9 0.6 0.10 B

30 16 53 53.1 19-20.8 155-23.9 8.0 0.6 8 153 1.5 0.09 0.8 0.6 0.08 B

30 18 49 57.8 19-19.9 155-16.7 9.0 1.0 7 206 1.3 0.61 3.1 4.4 0.11 C

31 5 8 56.8 19-20.6 155-29.1 8.0· 0.6 10 180 9,4 0.13 1.1 0.12 C

31 8 30 0.6 19-19.6 155-14.9 9.2 9 237 4.4 0.65 3.3 3.8 0.13 0

31 18 29 51.8 19-20.3 155- -9.3 10.6 7 161 3.4 0.23 1.8 3.2 0.07 C

AUG 1 3 38 22.4 19-18.6 155-16.1 9.0 11 239 3.5 0.44 2.4 2.3 0.12 C

1 6 19 17.1 19-11.5 155-36.5 5.8 2.9 ZO 212 6.3 0.30 1.8 1.0 0.16 C

1 8 37 9.0 19-23.1 155-23.4 8.0· 0.6 12 182 5.3 0.08 0.5 0.08 C

1 11 2 5.3 19-21.2 155-16.4 30.2 1.1 11 118 2.4 0.21 1.0 2.0 0.08 8

1 20 58 42.9 19-11.0 155-15.5 44.9 14 190 14.0 0.28 1.3 2.9 0.10 C

1 22 38 32.1 19-21.0 155-12.7 8.0* 1.7 8 174 6.2 0.05 0.3 0.04 C

2 .1 13 54.3 19-19.9 155-24.4 '8.4 0.4 8 154 2.0 0.13 1.0 1.7 0.09 B

2 2 23 17.3 19-25.0 155-29.6 8.0· 0.7 10 105 14.2 0.07 0.6 0.08 C

2 7 43 17.9 19-23.3 155-25.3 8.0· 0.9 11 185 6.1 0.09 0.1 0.08 C

12
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH ERZ MD Q

AUG 2 11 58 52.6 19-22.6 155-25.2 4.5 1.7 18 S2 5.5 0.09 0.8 1.2 0.22 C

2 18 39 50.3 18-60.0 155-18.5 12.5 2.6 Z4 228 33.6 0.38 1.4 5.2 0.13 0

2 21 0 56.5 19-23.3 155- 4.11 3.2 1.5 14 160 6.5 0.15 0.9 1.4 0.17 C

2 23 37 55.2 19-19.2 155- 9.3 8.0· 0.1 9 119 5.4 0.10 0.9 0.07 C

3 3 28 30.2 19-18.0 1S5-13.1 8.0· 0.6 10 232 8.5 0.33 2.1 0.15 0

3 1 18 2.5 19-19.1 155-12.1? 2.5 1.2 18 175 6.3 0.22 1.2 2.4 0.28 C

3 8 19 52.8 19-26.8 155-25.3 8.0· 9 229 6.5 0.14 0.9 0.01 D

3 13 13 25.9 19-20.6 155-19.2 24.4 9 82 3.3 0.51 2.1 4.1 0.09 B

3 17 10 10.3 19-24.1 155-26.51 8.0 2.2 14 161 9.2 0.12 O.Ci 0.6 0.14 C

3 17 49 16.6 19-10.3 155-26.9 30.6 3.1 23 160 2.2 0.19 1.0 1.9 0.14 C

J 18 57 IS.8 19-24.0 155-24.3 8.0· 13 172 7.3 0.08 0.6 0.09 C

3 19 55 23.0 19-24.4 155-25.6 B.O· 1.5 11 154 8.8 0.15 1.1 0.15 C

4 0 13 29.8 19-21.0 155-13.4 28.2 16 143 5.1 0.18 1.0 1.8 0.10 R

4 0 16 27.5 19-21.3 155-13.2 26.5 18 140 5.2 0.15 0.9 1.5 0.10 B

4 3 51 16.4 19-10.1 155-21.1 30.0 2.0 11 216 19.1 0.34 1.4 3.8 0.07 C

4 6 58 20.6 19-23.3 155-26.1 8.0· 1.4 7 271 7.5 0.26 1.4 0.05 0 .. 14 26 50.6 19-24.2 155-26.1 8.0· 2.1 17 69 8.8 0.06 0.5 0.12 C

4 20 44 2.2 19-22.1 155- 4.61 2.1 0.4 e 144 5.9 0.16 1.2 2.1 0.15 B

5 6 41 20.1 19-22.3 155-23.6 5.4 0.7 12 145 3.9 0.13 1.0 1.3 0.19 B

5 8 6 34.1 19-20.6 155-13.2 6.4 1.7 22 149 3.5 0.10 0.8 0.7 0.22 C

5 9 22 22.6 19-19.1 155-13.4 8.0· 0.7 12 173 7.3 0.21 1.6 0.22 C 5 14 4 24.0 19-18.2 155-15.4 29.0 1.6 16 148 5.0 0.11 1.1 1.8 0.11 B 5 18 32 38.0 19-19.4 155-14.9 7.7 2.1 20 144 4.5 0.09 0.7 0.5 0.12 H 5 19 18 4.6 19-50.5 155-23.4 34.8 2.1 18 95 7.3 0.38 2.0 3.8 0.18 B 5 22 37 13.5 18-56.6 155- 8.0 15.2· 2.5 19 262 43.1 0.54 3.6 0.19 0

5 23 12 45.5 19-22.7 155- 4.21 8.0· 1.9 11 97 5.6 0.15 1.4 0.21 B 6 1 26 18.4 19-23.7 155-25.5 3.6 0.9 19 70 7.6 0.11 0.8 1.4 0.21 C 6 1 40 15.2 19.... 19.4 155"12.3 5.9 1.6 20 170 5.7 0.14 1.0 0.8 0.22 C 6 10 33 41.2 19- 6.3 155-20.4 24.6 16 197 21.7 0.36 2.0 5.9 0.20 C 6 13 35 27.7 19-11.1 155-11.6 1.1 1.9 10 206 9.7 2.21 1.4 8.1 0.15 C

6 18 9 32.8 19-19.9 155-11.5 8.0 15 164 4.9 0.15 1.2 0.7 0.13 C 1 4 22 54.7 19-22.1 155-23.41 8.1 0.6 11 119 3.4 0.09 0.6 1.0 0.10 B 7 5 13 15.1 19-23.8 155-17.4 19.6 1.2 11 80 1.2 0.11 3.1 1.1 0,28 8 7 14 24 lA.9 19-24.6 155-23.8 8.0· 10 193 7.4 0.12 0.8 0.10 C 7 21 24 17.9 19-24.5 155-24.7? 0.0 1.5 10 131 8.4 6.09 0.7 11.6 0.12 C

7 22 35 37.5 19-10.1 155-26.9 30.7 2.3 16 183 11.6 0.32 1.7 3.3 0.13 C 8 2 30 10.9 19-14.1 155-22.8 8.0· o.e 11 227 8.0 0.25 1.7 0.16 0 8 7 43 42.3 19-20.5 155-12.6 4.6 0.8 15 152 6.7 0.17 1.1 1.3 0.25 C 8 15 42 9.6 19-19.2 155-15.4 8.7 2.1 21 144 3.9 0.08 0.6 1.1 0.12 B 8 17 1 11.9 19-24.9 155-24.3 8.0· 1.5 8 202 8.0 0.14 0.9 0.10 C

8 18 16 56.0 19-24.0 155- 3.3 3.3 1.3 13 111 7.7 0.16 1.2 1.8 0.25 C 8 18 40 28.3 19-17.8 155-51.3 8.1 2.1 16 205 3.7 0.15 1.6 1.7 0.15 C 9 3 18 55.4 19-17.0 155-23.2 4.9 0.9 17 129 5.9 0.09 0.8 1.2 0.17 R 9 6 3 1.7 19-19.3 155- 8.7 8.0· 0.3 9 119 5.6 0.18 1.5 0.15 C 9 7 32 50.5 19-23.2 155-11.1 13.9 1.9 22 61 0.5 0.07 0.7 1.0 0.10 B

10 4 18 19.1 19-21.7 155-29.11 8.1 1.4 17 63 10.5 0.16 1.0 1.2 0.18 B 10 5 36 22.7 19-23.1 155-17.3 14.1 1.2 18 63 0.8 0.09 O.A 1.2 0.12 B 10 1 59 33.3 19-19.7 155-15.2 5.9 1.0 16 177 3.9 0.18 1.1 0.9 0.19 C 10 9 14 28.7 19-19.5 155-11.2 4.8 1.S 16 171 6.0 0.20 1.3 1.3 0.27 C LO 11 8 22.3 19-25.0 155-25.07 0.0 1.5 14 101 8.9 7.• 98 0.8 15.2 0.17 C

13
SUMMARY OF SEISMIC EV~NTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP CHIN ERT ERH ERZ MO Q

AUG 11 1 37 38.7 19-21.0 155- 8.4 37.5 1.3 21 132 3,2 0.23 1.1 1.9 0.09 B 12 4 28 SA.7 19-22.4 IS5-26.J 5.0 1.3 20 51 6.6 0,08 0.6 0.9 0.18 B 12 7 54 31.6 19-12.4 155-26.6 30.8 1 ,I 15 168 5.8 0,52 2.1 4.2 0.10 C 12 11 1 0.2 19-20.6 155-14.4 8.8 9 235 4.2 0.52 2.8 2.9 0.12 0 12 16 4 30.9 19-20.8 155-14.1 6.7 10 185 3.7 0.26 1,4 1.2 0.13 C

12 16 35 33.4 19-19.8 155-14.5 9,0 1.2 12 201 5.0 0.20 1.1 1.7 0.09 C 12 16 55 52.1 19-19.8 155-11.6 8.9 0.8 11 164 5.1 0.17 1.2 2.5 0.10 C 12 16 58 5.4 19-18.8 155-16.2 6.8 1.2 11 145 3.2 0.10 0.9 0.7 0.11 B 13 2 35 6.9 19-10.8 155-35.3 4.4 1.5 17 135 8.2 0.15 1.1 1.1 0,21 C 13 3 4 37.0 19-17.0 155-22.3 8.0· S 269 6.2 0,80 4.8 0.22 0

13 13 15 6.6 19-22.2 155-25.6 8.0· 1.8 11 70 5,4 0,06 0.6 0.11 B 13 16 58 3.3 19-20.5 155-23,3 15.1 1.8 10 59 0,6 0,33 2,1 4.7 0.22 B 13 11 51 11.3 19-22.1 15~-25.6 A.O· 12 70 5.3 0.06 0.6 0.11 B

13 18 27 34.6 19-25.3 155-25,5 8.0· 1,8 10 158 9,2 0.06 0.4 0.06 C 13 20 10 37, "7 19-19.0 155-14.8 6.3 1,6 13 197 4.9 0.22 1.4 0,9 0,21 C

13 20 16 13 •• 19-18.9 155-14,3 8.0· 2.0 17 112 5.8 0.06 0,4 0.08 C

13 21 12 28.4 19-19.3 155-13.q 11,7 1.9 10 198 6.3 0.20 0.8 1.7 0.06 B 13 22 20 1~.4 19-20.0 155-12.0 12,3 0.7 11 201 4.6 0.21 1.0 2.0 0.06 C

14 2 5 12.7 19-18.9 155-15,3 10.7 9 196 4.3 O.2~ 1.1 1.9 0.01 C

14 3 45 46.6 19-11.7 15S-14.3 12.4 0.8 8 230 7.1 0.32 1.2 2.5 0.07 C

14 7 1 2R.9 19-30.7 155-13,71 8.0· 1.5 15 132 10.2 0.19 1.5 0.33 C

14 9 45 4.5 19-19.9 155-16,8 5.7 1.2 11 196 1.1 0.21 1.4 0,9 0.16 C 14 17 21 7.8 18-59.2 154-48.2 R.O· Ib 299 46.1 1.35 8.3 0.16 0

15 1 37 11.1 19-11.4 155-14.41 1Q.9 1.7 10 288 14,2 1.06 5.9 5.8 0.12 0

15 12 46 23.2 19-17.2 155-23.31 5.7 1.3 16 127 5.5 0.09 0,8 0,9 0.18 8

15 14 2 2.7 19-22.3 155-27.1 4.6 1.3 16 78 7.7 0.11 0.8 1.3 0.20 B

16 2 5 29.2 19-20.3 155- 9.9 5.2 1.0 12 161 3.3 0,20 1.6 1.6 0.20 C 16 10 18 43.6 19-18.9 IS5-1~.3 9.6 9 196 4.3 0.30 1.5 2.6 0.09 C

16 13 59 52.0 19-24.5 155-24.3 8.0· 1.6 7 202 8.0 0.15 1.0 0.10 C

16 15 50 27.8 19-19.0 155-15.5 10.1 10 191 3.9 0.18 0.8 1.5 0.07 B

16 16 15 32,3 19-19,9 155-11,9 8.0· 0.3 8 212 5,4 0.24 1.8 0.15 C 16 16 41 55.3 19-11.0 155-50.6 7.5 0.3 8 269 9.6 0.62 6.5 5.7 0.18 0 16 17 9 28.4 19-24.4 155- 6.0 8.0· 0.5 7 218 8.0 0.39 3.7 0.17 C 17 15 18 19.5 19-21.3 155-24.2 8.1 1. 1 10 124 2.6 0.08 0.7 1,5 0.10 B 17 15 22 30.1 19-21.8 155-11,3 6.6 0.9 13 137 2.5 0.06 0.6 0.4 0,10 B

17 16 0 50.9 19-20.0 155-12.9 8.0· 0.2 10 158 6.8 0,11 0.9 0,13 C 17 19 32 59.4 19-42.1 155-47.8 18.4 1.0 15 211 4,6 0.24 1.5 1.9 0.09 C 18 1 1 9.6 19-32.4 155-34.9 8.0· 9 162 6.0 0,09 0,7 0,10 C 18 2 9 38.4 19-23.3 155-24.6 8.0 1.5 16 65 6.3 0.06 0.6 1.9 0.10 B 18 3 3 2a.9 19-23.9 155-25,3 8,0· 1.6 14 145 1.8 0.13 0.9 0.14 C

18 5 38 23.8 19-24.8 155-16.8 15.2 1.1 15 117 0.5 0.07 0.6 0,8 0.08 A 18 8 19 SQ.3 19-21.8 155-16.1 21.6 10 158 1.2 0.26 1.2 2,5 0.09 C 18 8 34 43.0 19-21.2 155-24.1 11,3 2.2 16 65 ·2.4 0.11 1.0 1.4 0.18 B

18 14 55 17.1 19"19.9 155-13.6 6.4 2.0 20 157 4.9 0.11 0.8 0.7 0.21 C 18 16 28 A.l 19-30.1 155- 7.4 8.0· 10 179 6.4 0.21 1.9 0.22 C

18 23 14 3.9 19-20.5 155- 7.31 0.8 2,1 21 159 5.3 1.32 1. 1 4.8 0.22 C 19 3 5 45.4 19- 5.9 155-22.4 8.0· 11 225 20.9 0.46 3.4 0.28 C 19 3 32 17.7 19-23.9 155-24.5 8.3 2.0 20 63 7,2 0.07 0.5 O.S 0.13 B 19 17 59 34.1 19-21.3 155-26,0 8.0* 10 138 5,1 0.08 0.8 0.11 C 19 19 27 7,1 19-25.9 155·44.17 8.2 13 277 15.5 0.57 3.6 1.9 0.14 0

14
SUMMARY OF SEISMIC EVENTS (CONTINUEO)

1912 HR MN SEC LAT N LONG " DEPTH MAG NO GAP OHIN ERT ERH ERZ MD Q

AUG 19 21 5 55.8 19-19.2 155-15.4 27.0 15 163 3.9 0.16 0.8 1.5 0.08 B 19 21 19 22.7 19-19.0 155-15.3 28.2 15 165 4.2 0.18 0.8 1.7 0.07 B 20 2 57 3A.0 19-10.9 155-46.9 3.6 2.7 12 239 18.1 0.36 1.9 1.1 0.08 C 20 3 0 17.6 19-26.3 155-49.1 9.1 2.8 16 179 13.2 0.15 1.8 2.3 0.18 C 20 9 26 34.7 19-29.8 155-15.0 22.5 1.9 14 122 8.0 0.09 0.6 1.1 0.06 B

20 12 24 25.0 18-32.4 155-32.3 81.7- 3.4 15 328 50.1 0.73 6.5 0.18 D 20 15 10 38.1 19-20.9 155-13.6 10.4 1.7 10 166 4.9 0.24 1.1 2.0 0.09 C ZO 15 48 39.2 19-22,5 155-24,6 8.0 0.3 9 219 4.8 0.16 1.1 0.5 0.10 C 20 21 12 57.4 20- 7.4 155-36.61 2.2· 15 228 17.8 0.21 2.5 0.20 0 21 o 39 .28,3 19-19.5 155-15.5 6.5 0.8 11 117 3.S 0.25 1.2 1.6 0.17 C 21 1 14 31.7 19-25.5 155-21.1 3.5 1.1 12 116 10.4 0.10 0.7 2.1 0.17 C 21 It 14 21.8 19-24.1 155-24.5 8.0· 1.7 12 99 8.5 0.04 0.4 0.01 C 21 9 42 49.4 19-19.9 155- 8.8 8.9 1.8 10 169 4.5 0.08 0.6 1.4 0.06 B 21 17 18 16.1 19-16.6 1~5-23.1 6.3 1.8 15 142 6.4 0.15 1.3 1.0 0.24 C 22 1 47 47.6 19-20.4 155-19.5 4.9 1.9 15 61 3.7 0.05 0.4 0.5 0.10 B

22 2 19 21.6 19-26.6 155-27.9 8,0· 1.1 9 125 10.0 0.05 0.5 0.06 C 22 9 41 24.3 19-22.8 155- 5.0 3.1 1.5 15 137 6.4 0.13 0.9 1.1 0.11 B 22 1.1 34 29.4 19-20.4 155-14.4 26.7 1.7 18 160 4.6 0.13 0.8 1.2 0.09 B 22 13 28 11.3 19-19.9 1SS... 7.9 3.1 1.4 18 169 5.2 0.17 1.1 1.6 0.22 C 22 13 53 26.1 19"20.1 155-12.21 7.2 0.6 13 160 4.4 0.21 1,5 1.1 0.22 C

23 1 37 40.8 19-23.5 155.. 3.4 2.8 1.0 15 112 6.6 0.16 1.1 1.5 0.26 C 23 1 52 3~.1 19-58.3 155-31.6 25.5 1.9 24 172 21.2 0.19 1.1 2.1 0.12 C 23 2 34 41.2 19-19.4 155- 9.0 8.0· 0.6 12 116 5.2 0.11 1.S 0.21 C 23 2 56 45.3 19-11.3 155-20.4 24.8 1.3 21 193 12.6 0.17 1.4 1.8 0.14 C 23 7 38 54.1 19-23.0 155-43.4 8.0 0.7 9 LJ64 17.4 0.42 2.6 1.5 0.08 0

23 10 29 30.0 19-22.0 155-28.91 4.0 2.1 15 89 10.4 0.12 0.9 1.8 0.23 C 23 13 3 54.7 19-22.4 155-24.1 8.0· 0.4 9 90 4.7 0.06 0.6 0.09 8 23 13 55 48.0 19-21.0 155-10.3 12.3 1.8 10 ISO 2.1 0.20 1.0 2.0 0.09 B

23 20 26 3.8 19-19.1 155-10.7 8.0· 1.8 9 169 4.7 0.08 0.7 0.09 C 23 21 0 22.2 19-15.1 155-22.5 8.0· 0.5 10 222 7.6 0.22 1.5 0.14 C

24 2 3 17.4 19-26.9 155-10.9 25.5- 1.8 8 277 7.4 0.45 7.7 0.20 0 24 2 59 5.6 19"'20.2 155-16.2 8.9 8 219 2.1 0.14 0.8 1.0 0.03 B 24 4 38 59.4 19-27.6 155-25.9 8.0· 7 245 6.1 0.18 1.1 0.05 0 24 4 39 24.1 19-22.8 155-25.1 8.0· 0.8 11 139 5.7 0.06 0.5 0.08 C 24 9 32 1.6 19-18.4 155-15.3 9.7 0.4 10 265 4.8 0.39 2.0 2.5 0,10 C

24 10 38 1.9 19-23.2 155-17.4 13.3 2.8 24 61 3.0 0.05 0.6 0.5 0.13 B 24 14 42 2.0 19-24.7 155-25.9 8.0· 2.3 21 69 9.5 0.07 0.6 0.12 C 24 21 22 20.9 19"22.3 155"24.6 7.0 0.6 13 67 4.6 0.12 0.9 1.4 0.14 8

24 21 45 31.0 19-24.2 155- 2.91 0.0 1.3 15 119 7.9 6.14 1.1 12.8 0.26 C 24 22 1 10.3 19-20.4 155-11.1 6.7 1.3 19 163 3.7 0.14 1.2 0.7 0.22 C

2S 1 56 51.1 19-23.4 155-24.9 3.0 0.8 12 214 6.6 0.20 1 .1 1.3 0.14 C 2S 2 15 26.9 19-56.1 155-23.5 29.0 3.2 29 171 7.1 0.15 1.1 2.2 0.15 C 25 5 46 23.9 19-19.8 155-12.5 8.0· 0.3 13 163 6.2 0.09 0.7 0.11 C 25 12 51 2.1 19-10.5 155-27.3 29.0 16 163 19.1 0.30 1.5 3.3 0.14 C 25 19 7 14.6 19-20.7 155- 1.2 6.3 19 155 5.3 0.13 1.0 0.8 0.21 C

25 23 51 0.8 19-11.9 155-16.4 9.8 10 256 4.0 0.57 2.7 3.2 0.09 0 26 2 S6 0.8 19-24.9 155-22.8 8.0· 1.6 18 86 5.9 0.06 0.6 0.15 B 26 13 15 35.2 19-22.2 155-29.6 5.1 2.0 15 95 11.6 0.11 0.8 1.1 0.18 C 26 15 5 31.8 19-18.2 155- 9.31 0.0 1.9 14 189 7.2 7.66 1.4 14.S 0.23 C 26 11 28 43.0 19-19.0 155-13.8 7.8 1.7 14 175 6.6 0.17 1.3 0.1 0.18 C

15
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DfPTH MAG NO GAP OHIN ERT ERH ERZ MO Q

AUG 26 17 56 56.1 19-17.8 155-49.5 4.8 2.8 15 254 22.4- 0.83 3.3 2.6 0.16 0

26 21 19 44.7 19-20.1 155-25.0 6.3 14 112 3.2 0.13 1.2 1.3 0.22 B

27 3 23 35.6 19-19.1 155-15.5 6.5 1.6 19 162 3.7 0.14 1.0 0.7 0.18 C

21 4 24 12.6 19-18.5 155-48.21 2.5 2.9 16 249 20.6 1.26 3.4 7.2 0.19 0

27 7 22 53.9 19-19.8 155-12.8 8.0· 10 201 6.6 0.15 1.1 0.11 C

27 11 0 2.9 19-17.8 155-15.6 9.3 10 221 5.2 0.36 2.0 2.9 0.14 C

27 11 0 54.5 19-32.1 155-36.8 8.5 3.0 18 120 5.4 0.09 0.8 1.1 0.15 B

27 15 26 26.3 18-57.7 155-30.2 32.5 2.7 22 228 17.2 0.42 2.2 3.4 0.13 C

27 16 24 59.5 19-22.1 155-30.41 0.0 1.9 11 155 12.3 3.51 1.6 25.6 0,25 C

27 11 22 46.8 19-46.4 155-21.1 13.5- 10 177 12.9 0.09 1.2 0.10 C

27 18 4 40.0 19-25.2 155-27.1 4.1 11 119 10.8 0.10 0.7 1.1 0.16 C

27 22 51 17.3 19-18.0 15')-15.1 8.1 1.8 19 181 5.6 0.11 0.8 1.4 0.12 C

28 4 38 49.1 19-29.8 155-27.3 24.5 2.1 15 108 7.1 0.25 1.4 2.6 0.12 B

28 22 44 53.1 19-22.4 155- 4.3 4.7 14 148 5.3 0.17 1.2 1.2 0.20 B

29 1 49 41.9 19-20.6 15S- 9.7 10.0 10 157 2.8 0.11 0.9 1.7 0.07 B

29 1 54 51.6 18-51.1 155-18.91 8.0· 12 263 37.3 1.16 1.6 0.24 0

29 8 44 52.5 19-18.0 155-23.5 3.7 12 151 4.0 0.11 0.9 1.5 0.15 C

29 8 45 16.1 19-17.8 155-23.2 2.4 9 158 4.4 0.08 0.6 1.0 0.08 B

29 9 51 26.3 19-35.1 155- 9.3 8.0· 9 245 13.3 0.22 1.4 0.08 0

29 13 34 34.1 19- 9.7 155-21.0 26.1 15 116 1.6 0.21 1.2 2.3 0.12 C

29 17 10 13.9 19-28.'2 1~5-41.8 7.7 3.0 21 68 10.4 0.10 0.5 0.7 0.10 B

29 18 4 SJ.3 19-19.1 155-17.6 28.4 15 135 0.8 0.14 0.7 1.5 0.07 B 29 22 41 35.4 19-19.2 155-12.2 4.6 16 174 6.8 0,15 1.0 0.9 0.19 C 29 22 43 35.3 19-1R.6 155-15.1 5.6 1.6 17 203 4.8 0.20 1.2 0.9 O.lQ C 30 2 19 10.4 19-18.5 155-10.7 4.4 12 183 6.8 0.21 1.4 1.5 0.19 C

30 3 5 35.5 19-20.4 155-17.2 5.2 12 177 0.6 0.20 1.0 1.4 0.13 C 30 10 7 42.9 19-21.3 155- 7.6 3.3 1.8 17 145 8.6 0.13 1.0 1.1 0.18 B

31 6 27 20.0 19-23.6 15S-25.1? 0.0 1.3 14 100 9.4 0.31 1.0 19.1 0.22 C 31 16 50 27.4 19-23.8 1~5-17.0 14.4 1.9 12 61 0.8 0.07 0.5 0.8 0.06 A

31 18 13 20.7 19-12.1 155-27.9 6.0 2.3 16 149 8.3 0.14 1.0 0.8 0.14 B

31 22 14 49.9 19-22.6 155-16.01 4.1 0.6 7 86 0.4 0.45 2.0 3.8 0.23 C 31 23 13 54.9 19-23.2 155-10.3 42.9 2.5 13 194 2.2 0.34 1.7 2.5 0.01 C

SEP 1 3 22 33.7 19-20.2 155-19.A 2.3- 1.8 8 116 4.2 0.04 0.2 0.05 B

1 18 2 h.8 19-23.0 155-16.4 15.9 1.9 20 57 1.2 0.08 0.7 1.0 0.11 B

1 20 23 11.0 20- 7.2 155-55.7 34.2 2.0 18 271 15.6 0.19 1.2 2.0 0.08 C

2 2 42 3A.2 19-23.6 155-16.4 13.0 1.6 23 53 1.1 0.04 0.5 0.4 0.10 B

2 2 56 48.2 19-23.7 155-16.4 12.7 1.1 17 70 2.4 0.06 0.7 0.6 0.13 B

2 2 59 2Q.3 19-25.2 155-24.31 6.1 1.1 19 62 7.7 0.08 0.8 3.3 0.11 B

2 5 46 Q.3 19-22.2 155-23.1 h.8 1.3 21 62 3.8 0.09 0.8 0.7 0.21 B

2 6 46 53.3 19-10.6 155-32.4 6.0 1.8 14 106 8,3 0.18 1.3 1.2 0.23 C

2 17 54 11.9 19-19.5 155-17.3 30.4 2.~ 25 132 1.1 0.12 0.7 1.2 0.11 B

3 7 58 59.7 19-3R.1 156- 0.6 5.3 2.3 IS 224 15.6 0.49 2.4 1.5 0.21 C

3 10 39 46.9 19-19.4 155-14.1 8.0· 1.2 6 196 6.0 0.28 2.9 0.18 C

3 14 34 ".9 19-24.0 155-23.51 8.1 2.6 23 68 6.7 0.06 0.5 0.5 0.14 B

3 16 50 50.3 19-23.0 155- 3.6 4.9 1.1 8 169 5.8 0.18 1.2 1.5 0.14 C

4 4 33 10.8 19-19.7 155-12.6 8.0· 0.5 9 lOS 6.5 0.14 1.2 0.12 C 4 9 15 lA.S 19-22.5 155-23.31 8.2 0.9 13 111 4.3 0.08 0.1 0.6 0.14 B

4 22 52 7.4 19-20.2 155-11.9 8.0· 8 206 5.0 0.19 1.4 0.12 C

5 0 24 56.9 19-18.8 155-13.6 5.7 1.5 19 176 1.2 0.13 0.9 0.8 0.18 C

5 1 31 33.6 19"20.0 155-12.3 8.1 4.8 24 140 4.6 0.08 0.6 0.4 0.12 B

16
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HR MN SEC LAT N LONG W DEPTH MAG NO GAP DHIN ERT ERH ERZ MO Q

SEP 5 1 40 7.9 19-18.1 155-11.9 d.O" 0.5 13 182 1.3 0.15 1.1 0.13 C 5 1 41 Q.1 19-19.8 155-12.3 8.-0* 0.6 9 207 6.1 0.15 1 .1 0.10 C 5 1 41 34.2 19-22.9 155-26.3 2.7 1.4 20 73 7.2 0.12 0.8 1.7 0.24 C 5 1 59 50.7 19-19.1 155-12.4 2.5 1.4 21 174 6.2 O.ltt 1.0 1.3 0.24 C 5 2 8 14.9 19-20.6 155-12.3 8.0* 0.6 10 151 5.1 0.04 0.3 0.04 C

5 b 21 52.2 19-18.7 155-12.3 2.5 1.3 23 156 6.9 0.17 0.9 1.3 0.23 C 5 6 53 56.2 19-1~.6 155-12.3 2.3 1.6 22 156 7.1 0.17 1,0 1.6 0.25 C 5 7 10 16.8 19-20.2 155-12.1? 8.0··0.0 10 201 5.3 0.26 2.2 0.24 C 5 9 7 24.1 19-18.9 155-12.5 8.0· 0.2 11 193 6.6 0,11 0,8 0.09 C 5 10 45 15.8 19-18.5 155- 8.5 8.0* 0.5 12 202 7,0 0.18 1,4 0.15 C

5 17 40 45.4 19-25.2 155-21.31 2.6 1.0 11 136 3,9 0.19 0.6 0.7 0.13 B 5 19 21 41.2 18-54.0 155-17.5 9.9 2.1 11 271 33,9 0.62 3.3 2.7 0.12 0 5 20 55 19.3 19-19.8 155-12,4 8.0· 0.8 13 164 6.1 0.09 0.7 0.12 C 5 20 57 56.5 19-14.4 155-17.0 7.8 0.4 14 57 0.9 0.05 0.6 0.4 0.11 B 5 21 6 5.5 lR-54.3 155-15.3 2.5 2.8 16 250 35.1 1.35 2.7 8.0 0.17 0

5 22 26 40.2 19-19.6 155- 6.8 8.0· 1.9 14 178 6.8 0.17 1.4 0.18 C 5 22 43 Q.6 19-22.2 155-24.0 5.6 0.8 13 qa 3.8 0.11 1.0 1.3 0.19 8 5 23 0 25.8 18-53.0 155-16.4 8.8 2.2 14 213 36.5 0.61 3.2 2.7 0.12 0 5 23 6 8.8 18-55.1 155-17.0 15.4· 2.8 18 246 32.6 0.22 1.6 0.14- 0 5 23 30 45.4 19-24.1 1~5-24.71 0.0 0.8 14 174 7.6 6.86 0.8 13.0 0.13 C

5 23 41 6.1 19-20.7 155- 6.9 1.8 3.9 24 133 5.1 0.08 0.1 0.5 0.15 C 5 23 47 37.4 19-20.4 155- 1.6 ·'.8 1.8 11 160 5.0 0.10 1.0 0.6 0.14 C 5 23 49 50.3 19-22.1 155- 6.91 7.6 2.4 20 118 5.2 0.09 0.8 0.6 0.16 B S 23 56 39.4 19-23.9 155-24.4 4.9 1,2 16 156 1.2 0.10 0.7 0.9 0.15 C 6 0 1 2a.6 18-55.7 155-16.8 16.7· 2.8 23 244 32.0 0.22 1.S 0.15 0

6 0 4 24.4 19-20.2 155- 7.3 8.0· O. Of 12 175 5.7 0.12 1.2 0.13 C 6 0 19 11.4 18-54.7 155-16.6 9.2 2.0 16 248 33.7 0.47 2.3 2.9 0.15 C 6 0 40 51.1 1S-S5.1 155-16.7 9.2 2.5 16 247 33.0 0.42 2.0 2.6 0.13 C 6 1 S2 39.6 1"9-20.7 15S- 6.7 8.0· 13 153 b.l 0.10 1.0 0.12 C 6 2 1 4.7 19-19.8 15S- 7.6 8.0· 0.2 8 171 5.8 0.08 0.9 0.07 C

6 2 15 7.6 18"54.4 155-16.3 9.6 1.0 9 263 34.5 0.90 4.5 4.1 0.11 0 & 2 35 31.7 19-21.6 155- 6.4 8.0· 1lt 131 6.0 0.14 1.5 0.23 C 6 2 38 12.2 19-24.6 155-24.1 8.1 1.4 22 60 8.6 0.07 0.5 0.5 O.lS B

6 2 40 43.8 19-30.4 155-49.0 4.4 0,9 14 265 22.8 0.25 1.2 1.0 0.16 C 6 3 21 3.1 18-50.4 155-20.6 8.5 2.0 13 265 37.3 0.52 3.1 3.2 0.12 0

6 3 52 13.4 18-55.0 155-16.31 12.1 3.1 25 247 33.6 0.40 1.7 2.8 0.15 0 6 3 58 5.7 lA-53.7 155-14.9 1.9* 1.6 13 259 37.0 0.49 3.2 0.19 0 6 4 2 30.9 18-54.2 155-15.71 8.3 3.4 25 250 35.3 0.52 2.1 2.0 0.17 0 6 4 12 40.1 19-19.4 155-14.8 5.8 0.8 19 144 4.7 0,11 0.8 0.7 0.19 B 6 6 1 q.o 19-19.6 155-14.2 8.00 0.5 15 159 5.7 0.06 0.5 0.09 C

6 6 24 2Q.O 19-19.1 155-15.71 8.9 0.1 13 185 3.4 0.21 1.3 2.1 0.15 C 6 6 54 41.7 18-56.4 155-11.7 10.3 1.5 15 246 30.1 0,41 2.1 2.3 0.11 C 6 6 58 21.S 18-54.5 155-15.8 8.1 2.1 15 255 34.7 0.61 2.9 3.5 0.15 0 6 9 7 55.9 19-18.9 155-27.41 0.0 1.2 13 100 7.5 1.78 1.5 22.3 0.25 C 6 9 44 2.8 19-19.3 155-12.9 12.5 9 210 7.5 0.39 1.4 3.0 0.08 C

6 12 39 4S.3 19-23.4 155-24.9 8.0· e 218 6.5 0.15 1.0 0.08 C 6 15 10 6.3 19-10.5 155-30.2 39.0 2.1 19 149 14.5 0-.28 1.2 2.8 0.13 B 6 19 29 56,9 18-55.3 155-16.5 8.8 1.1 13 287 32.9 0.A7 4.8 3.0 0.13 0 7 0 43 15.9 19-18.9 155-15.1 5.9 0.8 13 198 4.6 0.20 1.2 1.0 O.lR C 7 1 33 37.9 18-55.3 155-15.7 8.6 2.1 17 247 33.8 0.53 2,5 3.3 0.16 C

17
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HH MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERT ERH ERZ Mn Q

SEP 7 1 45 5.9 18-55.3 155-15.3 11.1- 3.2 20 21+7 34.2 0.37 2.6 0.19 0 7 1 54 7.0 18-55.9 155-16.2 7.8 2.1 16 250 32.3 1.38 2.8 8.6 0.17 0 1 J 35 4.4 18-54.1 155-15.7 9.6 1.1 14 251 35.6 0.44 2.2 2.6 0.11 C 1 4 31 0.1 18-48.7 155-17.7 8.0· 2.7 17 272 42.3 0.39 2.6 0.11 0 7 5 58 13.1 18-49.1 155-18.3 8.9· 2.S 13 271 41.3 0.47 3.1 0.12 0

7 8 47 46.6 19-20.3 15S- 7.3 8.0· 0.2 10 163 5.6 0.08 0.8 0.10 C 7 8 48 21.2 19-19.4 154-59.81 8.0· 0.2 9 232 18.2 1.29 8.6 0.32 0

7 10 24 43.7 19-20.3 155-12.1 8.4 0.4 12 156 4.1 0.08 0.6 1.2 0.08 8 7 11 21 2.9 19- 1.2· IS~- 7.0 16.5· 2.8 23 241 35.3 0.31 2.1 0.18 0 7 11 28 53.8 18-46.2 155-28.6 39.2* 3.4 24 284 30.8 0.43 3.1 0.11 0

., 15 49 48.3 18-54.6 155-1-6.01 7.8 1.1 14 249 34.4 1.06 2.1 6.6 0.12 0

7 15 54 3.9 18-54.5 155-1-'.1 8.9 1.2 12 253 33.5 0.60 2.9 3.2 0.12 0

7 18 46 59.5 18-53.4 155-16.01 9.5 1.4 14 253 36.3 0.88 1.8 5.4 0.11 0

7 18 53 53.9 18-31.9 155-18.8 8.0· 1.5 16 300 62.1 1.16 7.2 0.15 0

7 19 19 lC).8 19-23.7 155-28.7 8.0· 0.6 16 91 11.5 0.14 1.1 0.19 C

7 23 45 42.1 19-26.9 155-27.8 20.6 1.0 16 87 9.4 0.09 0.5 1.1 0.07 A

8 1 10 26.7 19- 7.2 155-25.1 31.8 0.7 14 179 5.8 0.26 1.1 2.6 0.14 C

8 '+ 51 15.3 19-20.5 155-20.01 4.2 0.1 8 113 4.7 0.80 0.9 2.8 0.11 a

8 6 1 37.0 19-20.2 155-11.5 9.~ 0.3 15 159 4.5 0.08 0.6 1.0 0.08 B

8 12 19 38.1 19-19.3 155-14.6 6.0 15 193 5.1 0.15 0.9 0.7 0.14 C

8 15 30 SA.2 19-19.8 155- 7.1 8.0· 14 171 6.4 0.16 1.4 0.20 C

8 17 42 52.9 19-24.8 155-21.8 5.5 1.4 18 143 4.2 0.11 0.8 0.8 0.18 B

8 21 41 44.6 19-1A.8 1S5-12.1 2.9 2.0 25 155 6.7 0.16 0.9 1.2 0.26 C

9 It 42 42.1 19-12.0 155-26.1 6.4 2.2 20 133 5.0 0.10 0.9 O.b 0.16 B

9 4 49 2.8 19-11.9 155-26.4 6.3 2.8 24 141 5.1 0.10 0.8 0.7 0.19 B

9 5 3 48.3 19-12.3 155-27.0 6.6 13 124 5.3 0.10 0.9 0.7 0.12 B

9 5 8 55.8 19-27.2 155-13.8 8.0· 6 146 9.5 0.23 2.2 0.22 C

9 11 39 4q.7 19-19.4 155-13.7 8.0· 11 199 6.6 0.16 1.1 0.12 C

9 15 46 8.8 19-20.1 155- 7.8 3.8 2.8 23 139 4.3 0.14 0.9 0.9 0.21 C

9 16 22 21.4 19-19.0 155-15.4 6.9 1.7 18 171 4.0 0.10 0.8 0.6 0.14 C

9 21 13 9.5 19-10.9 155-33.7 4.8 2.7 24 102 9.5 0.13 0.9 1.0 0.22 C

9 22 59 2.0 18-52.5 155-15.8 5.6 3.2 20 256 37.9 1.17 2.5 7.1 0.14 0

10 13 0 32.3 19-23.4 155-24.9 8.1 1.1 20 65 6.6 0.12 0.8 0.8 0.18 B

10 13 1 24.5 19-24.4 155-17.7 8.2 1.3 9 88 1.6 0.07 0.5 0.7 0.04 A

10 13 2 8.8 19-~O.9 155- 8.0? 0.0 2.3 20 153 8.6 4.68 1.0 8.9 0.22 C

10 15 49 59.7 19-23.1 155-22.9 8.1 2.2 19 53 5.4 0.04 O.S 1.0 0.12 B

10 18 20 33.6 19-24.9 15S-17.0 8.1 1.3 9 73 0.1 0.05 0.5 0.3 Q.04 A

10 19 56 19.9 19-24.~ 155-23.4 7.8 1.9 20 91 6.7 0.07 0.5 0.4 0.15 B

10 20 24 55.1 19-21.1 155-24.7 4.5 1.9 20 77 3.0 0.08 0.7 0.9 0.22 B

10 22 42 38.3 19-10.0 155-35.4 7.1 3.3 22 107 9.5 0.16 1.0 1.0 0.19 C

10 23 19 53.2 19-23.3 1::i5-·;>H.?? 0.0 1.9 13 137 10.4 4.61 1.5 21.ri O.?3 C

11 0 21 51.4 I9-11.R 155-?2.3 2h.8 14 2~7 15.e; 0.'i3 3.1 3.1 0.10 D 11 11 40 29.7 1~-19.7 155-1H.2 21.6 2.1 23 lO~ 1.~ 0.12 0.8 1.3 0.12 A

11 11 45 3~.e 19-1q.8 155-13.& 7.-; 1.3 20 144 5.1 0.07 0.5 0.4 0.10 k

11 20 20 2.6 19-19.3 155-15.4 6.6 1.3 19 143 3.9 0.10 O.M 0.1 O.l~ C

18
SUM~ARY OF SEISMIC EVENTS (CONTINUED)

1972 HH MN SEC LAT N LON(; W DEPTH MAG NO GAP DMIN E~l ERH EHl Mn 0

SEP 12 4 34 21.8 19- 9.4 155-:19.1 4.3 0.4 10 195 10.7 0.20 1.5 1.2 0.14 r

12 4 57 50.3 . 19-20.4 1~5- 1.~ 8.0" 0.3 12 160 4.8 0.18 1.6 U.?l r 12 7 55 1.2 19-21.0 1~~-16.9 26.1 0.9 17 109 1.9 0.12 n.7 1.2 O.O~ A

12 13 43 32.1 19-21.1 155- 7.2 3.3 1.4 15 148 5.v 0.14 1 • 1 1.4 0.18 C

13 0 51 55.3 19-23.4 155-15.4 4.1 11 91 2.0 0.13 0.5 1.4 0.11

13 6 5 40.5 19-23.2 15~-2S.1 A.O" 0.4 11 151 6.3 0.10 0.7 0.12 C': 13 1 19 ".2 19-23.7 155-24.8 A.Oo 1.9 17 75 7.0 ().Ol 0.6 0.13 H 13 7 4A 2.2 19-19.3 155- 8.9 3.6 1.6 11 178 5.4- 0.19 1.2 1.3 0.24 C 13 7 49 21.4 19-18.1 155-15.8 6.6 1• 1 17 151 4. -f 0.13 0.9 0.7 o.?O C 13 8 56 44.6 19-18.1 155-15.3 7.0 1. 1 16 182 5.2 0.14 0.9 O.f) '0 .1~ C

13 8 57 3~.2 lq-27.1 15~-21.6 6.8 2.7 23 43 9.1 0.09 0.7 0.7 0.19 C 13 11 44 46.8 19-22.1 155-25.4 8.0 O.A 13 69 5.1 0.12 O.A 0.9 0.15 13 13 ~o 1.3 19-24.0 1~~-i!5.~ 1.9 ?9 24- 45 7.q 0.12 0.5 O.Q 0.15 R

13 15 43 46.5 19-20.0 155-12.4 Q.3 11 160 4.5 0.13 0.9 I.A 0.10 C 13 15 53 q.5 19-11.8 155- 1.9 33.8 1.4 22 ?IS 4.3 0.23 1.3 l.~ o. 11 C

13 22 6 J.6 19-19.7 1~5- e.q &.9 0.5 "9 171 4.1 0.18 1.5 1.0 0.16 C 14 0 36 ~.6 19-21.1 155-21.51 1.3 2.6 24 SA 7.8 0.12 0.8 0.9 0.21 C 14 7 1 31.6 19- 9.1 IS5-34.6 7.4 1.2 11 113 10.5 0.17 1.2 1 • 1 0.19 A 14 10 26 47.0 19-19.5 155- H.q 8.2 1 • 1 14 114 5.0 0.13 1 • 1 2.5 O.ll C 14 12 5 3A.6 19-22.3 155-?5.4 R.O 1.3 22 ~4 5.3 0.11 0.7 0.1 0.11 H

14 12 17 1.0 19-19.6 155-12.8 33.6 0.7 14 143 6.9 0.18 1.0 1.9 0.0'1 R 14 18 20 2Cj.7 19-54.1 1~5-1-'.O 21.9 1.6 23 202 6.4 0.14 1.0 1.1 0.1) C 14 20 10 17.1 19-51.5 155-47.1 12.4- 0.9 7 220 18.8 0.16 2.1 0.07 C

14 21 26 52.3 19-1A.O 155-16.7 6.4 l.3 ~3 149 3.4 0.09 0.7 0.5 0.1 [i

14 21 42 54.8 19-22.9 1~5-15.6 25.2 0.9 18 106 1.0 0.14 0.9 1.4 0.10 tj

14 22 3 23.9 19-23.2 1515-15.5 2~.1i 2.1 25 100 1.6 0.12 0.8 1.3 0.14 H 15 0 11 9.4 19-11.9 1 ~5-~"3. 1 32.3 1.3 1~ 17~ q.4 O.2b 1.3 2.3 O. 11 C 15 9 2 lQ.O 19-23.1 1~5-t?5.f)? 7.9 O.M ~O 69 b.1 0.13 O.R 0.11 O.l~ 8 15 11 21 51.2 lq-~~.J 155-?5.H c;.l 1.4 22 51 S.q 0.08 0.6 0.8 ().~l C 15 15 10 34.6 19-20.0 155-11.1 9.6 0.1 14 163 4.9 0.09 0.6 1 • 1 0.09 H

15 17 11 51.2 19-21.3 155-13.~ 11.':> 0.5 7 15S 4.2 0.25 0.7 2.4 0.05 C 15 18 53 19.0 19-19.9 1~5-12.f, H.O" 0.2 11 201 6.3 O.lEi 1.4 0.16 C 16 0 24 43.2 1~-11.8 155-16.3 40.0 1.6 14 163 15.5 O.~1 1. 1 2.7 0.09 C 16 -l 6 60.0 19-22.4 155-?2.4? 1.5 1.3 11 13~ 4.5 0.12 (\.9 2.1 O.t'O C If> 3 2 44.4 19-23.7 155-i?3.6 8.1 0.8 19 56 6.6 O.OR U.c; O.S O.lc H

1'6 It 6 4~.3 19-24.1 155-25.9 2.2 0.8 17 114 8.~ 0.11 (}.7 1.4 0.1'1 ~l 16 9 56 26.1 19-23.2 155-23.31 1.4 0.9 17 4~ ~.6 O.Hl 0.6 1. 0.21 C 16 1"J 58 30.6 19-18.5 155-14.5 26.8 1.1t 20 148 5.9 0.14 u.9 1.4 0.1.3 R 16 20 3 14.9 19-40.9 156- 3.2 3.1 1.1 19 233 22.5 0.45 1. 1.5 0.11 C 11 11 14 6.2 19-19.1 155-13.5 8.0" 1.2 10 194 7.0 0.11 1.3 0.16 C

17 12 42 50.7 19-20.6 155-12.9 1.4 1.0 18 150 3.5 0.10 O.A . O.S O.1~ h 17 22 57 51.8 19- 4.7 IbS-34.1 38.1 1.9 23 165 14.1 0.30 1.4 2.7 0.13 C 1M 18 A 13.4 19-23.0 15~- 7.8 8.0" 0.3 11 120 10.3 0.14 1.5 0.2~ C 18 19 24 23.0 19-2 (j. 9 155- 4.4 21.6- 7 32h 9 • .q 0.31, 3.4 0.08 0 18 20 22 41.1 19-12.3 155-14.9 41.8 1.0 12 llOI 12.2 0.54 2.0 4.9 o. 11 C

19 0 36 40.9 19-19.3 155-15.u 8.4 0.6 13 170 4.4- 0.13 0.9 1.7 0.12 C 19 3 6 12.5 19-49.11 155-J3.2 30.7 1.5 ~6 107 11.~ O.l~ 0.7 2.0 0.10 19 6 39 7.2 19"'19.B 1~5- 8.3 H.O· lS 110 4.'1 0.14 1 • 1 O.I~ C 19 7 9 3;».4 19-20.1 156-19.6 1 1.4- 1.5 2l ?14 i+tJ.4 0.36 it.3 M.- 0.19 ()

19 12 4 46.1 19-20.9 155-1j.~ 11.7 0.4 tt 168 4.9 0.21 0.6 1.4 H.OS H

19
SUMMAHY OF SEISMIC EVENlS (CONTINUED)

1912 ~R MtJ SEC LAl N LONG W DEPTH M#\6 NO GI\P OMIN ERT EHH ERZ Mf~ Q

SEF 19 15 39 1.8 19-19.{i 155-15.3 7.0 1.5 21 13~ 3.6 0.07 0.& 0.4 0.14- lq 1S 56 26.2 19-23.7 155-25.6 7.7 3.3 25 56 7.7 0.08 0.5 0.5 0.1 S ti 19 ~6 27 13.3 19-23.3 15S-2~.9 8.0* 1.7 11 240 1.3 0.34 2.0 O.l~ n 19 .6 51 19.4 1'J-23.4 15~-2h.O 8.0· 9 241 1.5 0.31 1.9 0.13 I) 19 20 14 40.8 19-23.8 155-20.2 A.O· 1.7 8 243 8.3 0.26 1." 0.09 l> 20 0 18 10.3 19-22.6 15S-i4.0? A.2 -0.1 'I 12-' 4.6 0.10 O.A 1.~ 0.10 H 20 3 SA 10.6 19-21.0 l~S- 1.~ Q.2 6 163 4.4 0.11 1 • 1 1.'i 0.03 C 20 4 H 55.1 19-20.0 155- 7.1? d.O· 13 1~7 h.l 0.11 l.t\ O.?h C 20 6 58 10.1 19-20.4 15~-lti.q 2.1* 8 <it! t!.6 0.03 0.2 0.U5 fi 20 1 0 41.2 19-21.5 15':>-25.0 9.4 0.2 10 131 J.9 0.11 O.A 2.0 0.10 11

20 11 45 22.6 19-19.2 1~5-11.9 3.b 1... 19 17~ 6. 1 O.1~ 1.2 1.3 O.?~ C 20 2.3 5 39.9 1Y- A.3 lbS-cS.Q 43.5 1.A 14 1-'9 4.1 0.47 2.3 4.3 O.l~ C 21 0 56 4A.3 19-29.9 1~5-27.0 8.0* 1 .1 8 134 6.5 0.07 O.A O.OQ C 21 1 50 2.0 19-}9.3 155-21.2 5.3 7 117 4.1 O.IM 0.5 1.4 O.OJ H 21 3 5~ 41.~ 19-22.8 1~5- 4.4 3.2 0.5 9 96 &.0 0.13 1.1 z.u O.lft A

21 5 6 li?O 19-20.1 155-10.1 ti.7 0.2 9 1*,3 3.6 0.07 O.b 1. 1 0.06 R 21 11 44 2A.8 19-24.6 15r;-)6.5 12.5 0.4 11 )40 2.3 0.11 0.5 0.9 0.05 H 21 19 1:)4 3?4t 19-21.1 15ti-45.4 4.3 10 132 11.0 0.21 l.~ 1.5 0.17 C

21 20 21 42.6 19-1ft.b 155-)4.9 8.0· 0.8 10 217 1.0 0.11 1. 1 0.10 C

21 21 25 40.5 )9-19.4 155-12.3 5.2 1.9 16 110 5.1 o.l~ 1.2 1• 1 O.~6 C

21 21 4A S9.1 19-1Q.8 155-11.9 4.9 1.4 '15 165 5.1 a.lf. 1.0 1 • 1 0.21 C

22 3 46 26.6 19-19.A 155-11.3 4.9 1.3 10 221 5.0 O.2!"l 1.5 1 • 1 0.15 C 22 5 35 43.4 19-19.1 155-10.4 4.5 1.2 15 168 4.4 0.11t 1.0 1 • (I 0.17 C 22 9 '5~ Q.9 19-19.2 155-13.5 9.3 12 206 7.1 0.13 o.q 1.2 O.Oq t=4

22 13 0 25.2 19-19.1 lS5-1J.3 R.O* 1.8 13 173 7.4 O.O~ 0.6 0.10 C

22 14 lA Q.7 19-22.3 155-1S.4 25.0 ~3 114 0.9 0.25 1.0 2.3 O.l)~ H

22 15 32 46.5 19-20.7 155-16.b 26.7 2.6 24 1~3 1.t\ O.l~ 0.8 1.3 o.l:i B

22 1., 31 49.·9 lC}-11.3 15~-23.A 4.5 1.9 16 13~ 5.4 0.08 O. of O.~ 0.11 H

23 2 37 49.4 19-24.5 155-16.3 12.3 1.6 18 58 1.5 O.O~ 0.5 0.5 O.Oq A

23 7 31 39.6 19-25.6 155-24.4 R.O· 1.7 13 1143 7.5 0.08 O.~ 0.07 C

23 10 18 11.3 19-22.9 155-lJ.A 8.0· 1.1 1~ 65 5.0 0.07 0.6 0.15 H

23 18 SA 52.1 19-22.4 15~- 1.0 6.2 10 168 5.n 0.24 1.7 1.3 0.1 C

23 19 2R 20.8 lq-19.4 1~5-12.7 3.1 1.7 II 148 5.6 0.14 O.tl 1 .1 0.73 C

24 4 1 54.8 19"36.7 15S- 6.4 8.0· 2.1 12 19H 12.9 0.12 U.8 O.Ok C ~4 14 SA 6.6 19-21.4 155-14.5 21.3 2.0 16 129 5.5 0.14 O.Q 1.5 0.13 B

24 l!:» 10 4q.A 19-2".2 15S-l6.0 H.O- 1 • 1 12 131 8.2 0.13 1.0 0.15 (:

24 16 13 13.2 19-20.2 1~~-lA.6 12.1 1 .1 H~ 2.1 0.17 1.7 1.:l 0.1S H

24 17 50 24.4 19-1R.6 155-14.1 9.4 10 2013 5.5 \).?h 1.3 2.4 0.10 C

24 20 13 50.8 19-20.4 15~-1 J.:~ 5.8 1 • 1 17 151 3.9 0.15 1.0 0."1 0.22 C

25 0 50 3~.4 19-19.9 lS!>-13.r; 9.R 11 1'J0 6.2 O.lll 1.0 1.~ U.09 C

25 14 Sh 59.1 19-1tJ.B 155-12.1, S.4 1.3 11 164 6.4 0.20 1.2 1.7 O.~O C

25 11 52 59.6 19-24.4- 1~5-23.1 A.O- 1.5 8 17~ 6. 1 0.07 0.6 0.07 C

25 18 0 22.5 19-24.4 15~-23.4 8.0· 1.8 17 h~ 6.6 0.13 1 • 1 n.20

25 18 31 44.9 19-19.8 1~~-1~.1? 5.5 1.6 15 Ift~ 5.0 0.11 1.5 2.5 0.26 C

25 20 23 5S.3 19-34.6 155-14.41 8.0* 10 233 16.9 0.34 ~.O 0.21 ()

25 23 58 3.!) 19-24.'; 155-11.0 7.A 0.6 9 67 0.7 0.05 0.3 0.3 0.03 A

26 1 44 q.O 19-20.0 lS~-12.0 2.8- 1.4 9 207 5.~ 0.26 1.4 0.19 C

26 2 2 40.8 )9-23.& 15S"?5.3 A.O* 1 .1 12 101i 1.• 2 0.0& 0.5 O.OR H

26 13 55 57.6 1~-lA.3 15~-?1.4 ".0* 1.7 10 15~ 4.8 0.12 1.0 0.14 C

2b 16 16 25.5 19-2R.l 1~~-55.3? 0.0 2.9 16 t!13 23.0 O.6b 3.0 1.6 0.2& C

20
SUM,..ARV OF SEIS~IC EVENTS (CONTINUED)

1912 HR MN SEC LAT N LONG W DEPTH Ml\.G NO GAP DMIN ERT EHH ERZ Mt' Q

SEP26 11 31 50.5 18-58.Q 1~5-17.4 33.5 15 ?48 26.8 0.44 l.3 4.~ o• 11 C

26 20 26 44.4 19-19.9 lS5-24.~ 7.9 8 163 2.9 0.10 1.0 0.7 O.Oq C

26 20 45 42.4 1~-13.3 155-33.h? 7.2- 2.5 20 18 6.9 0.12 1.0 0.9 O.?2

26 22 28 56.2 19-11.4 155-10.41 0.0" 1.6 12 203 8.6 0.24 1.3 0.70 C

26 23 4 42.1 19-23.9 15~-29.1? (4.0· I.R 11 240 12.3 0.43 2.5 O.2? r~

26 23 26 10.0 19-24.4 155-16.6 12.8 18 66 2.0 0.04 0.5 0 ... O.OQ A

27 1 S9 7.9 19-24.3 155-25·.21 0.0 '1.3 1b 66 8.3 1.21 0.1 13.1 0.20 C

21 4 38 2q.6 19-1q.2 155-11.6 3.b 1 • 1 15 114- 6.1 0.19 1 • 1 1.5 U.(?4 C

27 8 24 20.9 19-20.5 15~-12.b 15.2 0.9 13 152 6.A 0.26 1.A 3.2 0.13 C

27 9 57 5q.~ 19-20.1 155- 7.1 8.0* 0.9 9 If)~ 6.0 O.OH 0.3 0.07 C

27 ItJ 5 21.3 19-22.9 155-22.3 7.2 0.4 7 152 4.8 0.26 0.6 2.2 0.0" C

27 18 22 2.1 lq-19.8 1!:»S-11.1? B.2 1- 166 5.2 0.14 1 • 1 0.6 0.13 C

28 3 50 14.2 19-24.1 155-?6.4 8.0· 0.1 11 118 9.1 0.06 0.5 0.08 r

28 7 2A 14.6 19-18.3 155-14.1 10.9 0.3 10 216 6.1 0.43 1.8 3.5 0.10 C

28 16 19 22.6 19-18.9 1~5-15.5 9.0 2.2 IJ 194 4.1 0.09 0.7 0.8 G.OR A

29 0 26 37.3 19-19.9 15~-11.7? 6.2 1.9 17 1~4 5.0 0.14 1.2 1.Q O.?2 C

29 5 19 16.5 lQ-20.3 15S- H ••, 6."# 2.3 I" If»2 3.tJ 0.12 1.0 0.6 O.lf'\ C

29 12 47 '26.6 19-20.3 155- H.O 9.1 0.2 10 16~ 4.b 0.11 0.9 1.1 0.08 H

29 19 26 51.4 lq-2?4 155-?3.4 ~.2 1 .1 21 51 4.1 0.07 U.5 0.5 0.14 H

30 0 1 1.2. 1Y-23.1 15~-~3.1 8.0* 0.1 11 114 5.3 ().O9 0.1 0.12 r:

30 S 5 49.5 19-10.9 155-11.61 8.0 0.1 11 149 3.8 0.10 0.9 0.7 0.14 b

30 10 31 i!.2 19-23.1 155- 6.2 0.6 1.7 21 101 &.1 O.~4 0.7 1.0 O.If1 C

30 16 42 34.5 19-19.2 155- 9.2 3.4 1'..2 22 15b 5.4 O.l'l 1. 1 1.2 O.?B

30 22 52 15.5 19-19. -, 155-12.1 8.0· 0.6 11 231 5.9 0.11 1.1 0.11 D

Trlb1e 3- Felt earLllguake s

Date Time Magnitude Felt reDort

H ~1 S

Jul 12 20 31 49.0 3t!3 Kapapala

14 09 36 57.5 4.5 Hila, Papaikou, Honokaa,

Pahoa

20 17 20 4!:~.O 2.6 Kapapala

29 17 25 36,.8 3.0 KaIi1uela

Aug 25 0')~~ l:j 26.9 3.2 Paauilo, Hila

S8}) 5 01 31 3'3.6 4.8 Kealakekua, Kainaliu,

}J[l.pOOpOO , Kalapana, Hila,

Pepeekeo .' Laupahoelloe,

Wairnea

5 2J 41 06.1 3,,9 Kalapana, Hila" Volcano,

Glenwood, Keaau, Pahoa, ~\JcLirf1ea

7 04 37 00.1 2.7 Kapapa1a

13 13 4D DI.3 2.9 Kapapala

14 00 36 08.6 2.6 Kapapala

19 l/~ .) 56 26.2 3.3 Kapapa1a

21
Table 4. Seismometer stations in Hawaii operated by the U. S. Geological Survey.

STATION NAME

AHUA

CONE PEAK

DESERT

ESCAPE ROAD

HALE POHAKU

HILINA PALl

HUALAlAI

KAAPUNA

KAHUKU

KAPAPALA RANCH

KEANAKOLU

KIPUKA NENE

KOHALA

MAUNA LOA

MAUNA LOA X

MAKAOPUHI

MOKUAWEOWEO

MOUNTAIN VIEW

NORTH PIT

OUTLET

PUU HULUHULU

PL1J HONUAULA

PUU PILI

SOUTH POINT

WAHAULA

WALDRON LEDGE

CODE LAT-N LONG-W ELEV TYPE

AHU 19 22.40 155 15.90 1070 3

CPK 19 23.70 155 19.70 1038 3

DES 19 20.20 155 23.30 815 3

ESR 19 24.68 155 14.33 1177 3

HPU 19 46.85 155 27.50 3396 1

HLP 19 17.96 155 18.63 707 1

HUA 19 41.25 155 50.32 2189 1

KAA 19 15.98 155 52.28 524 1

KHU 19 14.90 155 37.10 1939 1

KPR 19 16.40 155 26.70 610 1

KKU 19 53.39 155 20.58 1863 1

KPN 19 20.10 155 17.40 924 3

KOH 20 7.69 155 46.77 1166 1

MLO 19 29.80 155 23.30 2010 1

MLX 19 27.60 155 20.70 1475 3

MPR 19 22.07 155 9.85 881 1

MOK 19 29.28 155 35.98 4104 1

MTV 19 30.25 155 3.75 409 1

NPT 19 24.90 155 17.00 1115 3

OTL 19 23.38 155 16.94 1038 3

PHH 19 22.45 155 12.66 988 3

PHO 19 28.90 154 53.40 215 1

PPL 19 9.50 155 27.87 35 1

SPT 18 58.91 155 39.92 244 1

WHA 19 19.90 155 2.92 29 1

WLG 19 25.49 155 15.69 1067 3

CAL VCO RADIO

6.0 2380

1.34

1.34

5.6 1360 RF6

6.0 2040

5.2 1700 RF4

5.5 1020 RF12

5.7 1700 RF3

6.5 1700 RF1

4.8 2380 RF7

1.34

1.5 2380 RF2

6.5 1360

1.34

5.7 2720 RFS

6.5 2040 RF3

6.2 680 RF8

1.34

5.0

6.5 2720 RFI

4.4 1360 RF11

7.8 2040 RF7

6.0 680 RF9

REMARKS

OPTICAL SEISMOGRAPHS

P~EAKALA Z HAL 20 46.00 156 15.00 2090 3

HALEAKALA EW RAE 20 46.00 156 15.00 2090 0

HALEAKALA NS HAN 20 46.00 156 15.00 2090 0

HILO Z HIL 19 43.20 155 5.30 20 3

HILO EW HIE 19 43.20 155 5.30 20 0

HILO NS HIN 19 43.20 155 5.30 20 0

KEALAKEKUA Z KLK 19 31.20 155 55.30 505 2

KEALAKEKUA EW KLE 19 31.20 155 55.30 505 2

KEALAKEKUA NS KLN 19 31.20 155 55.30 505 2

KIPAPA KIP 21 25.40 158 .90 76 3

UWEKAHUNA Z UWE 19 25.40 155 17.60 1240 3

UWEKAHUNA Z USZ 19 25.40 155 17.60 1240 4

UWEKAHUNA EW USE 19 25.40 155 17.60 1240 4

UWEKAHUNA PEZ 19 25.40 155 17.60 1240

UWEKAHUNA PEE 19 25.40 155 17.60 1240

UWEKAHUNA PEN 19 25.40 155 17.60 1240

22

0.71

1.0

1.0

1.0

1.0

1.0

1.0

0.34

0.34

0.56

0.7

1.0

1.0

Wood-Anderson

Wood-Anderson

Wood-Anderson

Wood-Anderson

Discontinued 9/20/72

15-90 Press Ewing
19 34 .0 19 3 at •0 ...-- ..... U1 <.11

<J'1 U1

W 0")

0

0

0

+.

+

tC",x.

\ . . 6 4.• " • • • • I

"

+ +

~+ •••

I: -. I •

.... +. ....1 +. · x.:... ... . :.. - ~. +......

.. ..~ t

.+.:-:. ·x . .+.+ 1-

+

I •

.f-

+

O' Q)~

+

+. ...

t:.. •• .~.:•.:~; ••

+ •+ -. .r: ~: 7-~ ••.:.:~ ::.!-:':.L-.: . .".,. :.::.. . •• : ••• I. ·1· •

• I +

+

• + : •

+...... X. +••• : +

:..+. •.• :

rill-.:,.:

+

+ •••

o

19 10.0

Magnitude

Interval

4.0 < M S 5.0

3.0 < M S 4.0

2.0 < M S 3.0

M S 2.0

Symbol

•

X

+ --- o 5 Km

Figure l.--Plot of epicenters in the Kilauea region. Triangles are

seismometer locations. Kilauea Caldera and the major pit craters

on the east rift are shown in outline. The Pacific Ocean lies in

the lower right portion of the illustration.

23
Table 5.--Seismic Instrumentation Types

Type 1. Consists of:

a) EV-17 - Electrotech EV-17 1.0 sec. period moving magnet

vertical component seismometer or horizontal

component adjusted for an output of 0.5 volts/cm/

sec and 0.8 critically damped.

b) Preamp/VCO - Develco Model 6202 voltage controlled oscillator

or a USGS/NCER Model JE202. 3 db points for bandpass

filter at 0.1 Hz and 30 Hz. Signals are transmitted

on audio FM carrier over cable or FM radio link to HVO.

Type 2. Consists of:

a) EV-17 - Electrotech EV-17 1.0 sec. period moving magnet

vertical or horizontal component seismometer.

b) 3.5 Hz galvanometer with appropriate shunt resistances for

critical damping. System is poorly calibrated.

Type 3. Consists of:

a) EV-17 Electrotech EV-17 (as described above)t Hall-Sears HS-I0

0.5 sec. period moving coil seismometer or Observatorybuilt 0.8 sec. period moving coil seismometer with

HVO-built solid state seismic preamplifier (voltage

gain t 200X) , direct signal transmission over cable to

HVO and HVO-built solid state amplifier and galvanometer

driver t or Observatory-built electromagnetic seismometer

with 2 Hz galvanometer. Peak magnification approximately

40,000 at 4 Hz.

Type 4. Consists of:

Sprengnether short period vertical and horizontal seismometers

(E-W) with 1.5 sec. galvanometers, coupling factor = 0.25, 2X critically damped. Peak magnification

approximately 1500X at 2 Hz.

Experimental type amplifier systems are not given type numbers.

24
10 5

Period (sec)

2 1 0.5 0.2 0.1 0.05 0.02 0.01

c

0

...

0

10 (.) 4

.-

C

0'

0

10 3

.......

/,~'--~', ~, ,

'",

"'Type 3

"'I. "Type 2

1/ ,.'------------ Wood - Anderson I, . ~I ..- ••••••

"

..--, -- , - , I --_

'/. • •••• Type 4

/,

I

'I

0.01 0.1 I

Frequency

Figure 2.--System response curves for the Wood-Anderson torsion

seismograph and for the four different types of seismometeramplifier (or galvanometer) combinations in use by the

Hawaiian Volcano Observatory_

25
TILTING OF THE GROUND AROUND KILAUEA CALDERA

Tilting of the ground around the summit of Kilauea is monitored

daily by a short-base water-tube tiltmeter in Uwekahuna Vault, and at

irregular intervals it is measured on a regional scale by means of a network

of field tilt-bases and a portable water-tube ti1tmeter. The attitutde of

the ground surface at each tilt-base is reported in terms of north-south

and east-west tilt coordinates. Both coordinates at each station were

arbitrarily set equal to 500 when measurements at that station were begun.

Increasing tilt coordinates correspond to northward and eastward tilting

of the earth's surface; that is, to a relative subsidence toward the

north and east. A one~unit change in coordinate corresponds to a tilting

of 1 microradian (1 mm per kIn) in the direction indica t:!..~d

Essential data on each tiltmeter station are listed in Table 7, Summary

65. The field tilt bases were not measured during this quarter.

Table 6.--Ti1t Coordinates at Uwekahuna,

July, August, and September 1972

Date N-S E-W Date N-S E-W

July 2 728 330 Sept. 3 727 325

9 728 332 10 727 322

16 728 329 17 726 326

23 728 332 24 726 325

30 728 331

Aug. 6 728 329

13 728 334

20 728 330

27 728 327

26
Reference Cited

Hamilton, R. M., B. E. Smith, J. C. Hall, and J. H. Healy, 1969,

Summary of seismic activity in the Pahute Mesa area, Nevada

Test Site, December 1968 - June 30, 1969: u.S. Atomic Energy

Comm. (USGS-474-58): Springfield, Va., Clearinghouse for

Federal Sci. and Tech. Inf., 63 p.

27

UNITED STATES

DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY

HAWAIIAN VOLCANO OBSERVATORY

SUMMARY 68

October, November, and December 1972

By

Patricia Stevenson*, Robert Y. Koyanagi,

and Arnold T. Okamura

Summary of Eruptive Events

By

Donald W. Peterson

OBSERVATORY STAFF

Geology

R. L. Christiansen

R. T. Holcomb

D. W. Peterson (Scientist-in-Charge)

R. I. Tilling

Geophysics

K. T. Honma

George Kojima

R. Y. Koyanagi

A. T. Okamura

J. D. Unger

C. J. Zablocki

*Office of Earthquake Studies, Menlo Park, California

Geochemistry

R. T. Okamura

Support

J. C. Forbes

w. H. Francis

M. S. Onouye (Mrs.)

M. K. Sako

Akira Yamamoto
CONTENTS

Summary of Eruptive Activity

Seismic Swmnary

Tilting of the ground around Kilauea Caldera

Publications of Special Interest

References

Illustrations

. . . . . .

· . . . . . . . . .

Page

I

2

26

29

29

Figure 1. Epicenter map · . . . . . . . . . 22

2.

3.

Response curve for System II, EV-17, Teledyne

seismic preamplifier • . . . • • • .

Tilting of the ground around Kilauea Caldera

25

28

Tables

Table 1. Number· of earthquakes and minutes of tremor . . . . 3

2. Summary of seismic events 8

3. List of felt earthquakes 21

4. u. S. Geological Survey seismograph stations

in Hawaii . . . . . . . 23

5. Seismic instrumentation . . . · . . 24

6. Tilt coordinates at Uwekahuna 26

7. Tilt coordinates and changes at bases around

Kilauea Caldera . . . . . . . . . · . . . . . . . . . 27

iit
SUMMARY OF ERUPTIVE ACTIVITY

Kilauea's eruption on the upper east-rift zone at Mauna Ulu and

Alae continued steadily throughout this quarter. The active lava

lake, approximately 80 by 150 m, in Mauna Ulu's summit crater

continued to behave in essentially the same manner as in previous

months. Its level fluctuated from 28 to 50 m below the crater rim,

but generally remained at 30 to 33 m. Lava normally entered the lake

at the east end and circulated toward the west, although sometimes

the circulation pattern reversed or varied in complex ways. Lava

fountai.ns, 2 to 15 m high, commonly played on the lake surface,

generally along the margins, but sometimes in the central portions.

Two to four fountains at fixed locations on the lake operated nearly

continuously, but at times the fountains shifted in location and number,

with as many as a dozen simultaneously active. At other times the

lake surface became completely stagnant.

The vent on the floor of Mauna Ulu's elongate trench, about 170 m

east of the lava lake, continued to feed lava into large conduits that

supplied both the lava lake in Mauna Ulu and the subsidiary vent at the

northern edge of Alae. The Alae vent in turn fed a complex lava lake

at its summit. From time to time, segments of Mauna Ulu's trench floor

collapsed, and, at other times, new lava welled out to cover parts of

the floor. Several persistent subsidiary vents between the principal

vent and the lava lake were the sources of these int·ermittent flows.

On occasion the flows ended as strong, noisy blasts of gas were emitted

from the vents.

At the beginning of October, the vent and the lava lake at Alae

fed a well integrated lava-tube system that extended all the way to

the ocean, a distance of 13 km. Tube-fed lava entered the sea along

a 2-km front between Kaena Point and Kealakomo. About mid-October a

decline was noted in the eruptive rate of the Alae vent, and the volume

of flow in the lava-tube system correspondingly diminished. The flow

of lava into the ocean completely stopped about October 20, but dwindling

flows continued through the lava tubes until early November when chilled,

viscous lava gradually piled up within the tubes and plugged most

passages. The flow into the ocean from August 23 to October 20 added

about 0.18 km2 of new land to the island.

The decline of vent activity at Alae was temporary, but during

the lull the passage conducting lava from the vent southward into the

lava lake became blocked and the lake crusted over. When more vigorous

visible activity resumed in late October, the Alae vent frequently

emitted strong fountains, including, at times, both dome fountains and

arching fountains. Flows cascaded dowll the slopes of the northern part

of Alae's growing lava shield and across the crusted surface of the

lava lake. Lava from the vent also traveled below the crust of the

lake through passageways to emerge at three different satellitic vents

1
along the southwestern to southeastern margin of the lake. Each of

the three produced a satellitic lava shield, which progressively added

bulk and breadth to the main Alae lava shield. Most of the'lava

erupted between late October and Decemb~r contributed directly to the

growth of the lava shield at Alae. In mid-December, however, flows

advanced south~southwestward, and a tube system developed that by the

end of the month reached almost to Poliokeawe Pa1i. Correspondingly

the rate of growth of the Alae lava shield diminished as lava was

conducted to places far from the vent.

SEISMIC SUMMARY

Events recorded by the U.S. Geological Survey seismograph network

in Hawaii fall into two categories:

1) Local earthquakes and tremor originating in the region of the

Hawaiian Islands (usually within 100 km of at least one

seismograph),

2) Distant earthquakes originating more than 3,000 km from Hawaii.

As an index of seismic activity at Hawaiian volcanoes, daily counts of

earthquakes and minutes of tremor recorded by seismographs in Hawaii

are listed in Table 1. The earthquakes are separated in groups on the

basis of region of origin as determined by the analysis of records

obtained daily at the observatory (UWE, MLO, MLX, ABU, DES, NPT, WPT,

MPH, KMO, OTL).

Computer locations of well-recorded events are listed in· Table 2.

The location of each seismograph station is listed in Table 4, along

with a description of the equipment at each station.

2
Table l.--Number of earthquakes and minutes of tremor recorded on seismographs around Kilauea

TremoT is separated into three categories: Deep, Intermediate, and Shallow, on the basis of relative

amplitude on seismographs in the summit region. Unless otherwise stated, tremor is presumed to be

associated with movement of magma within the central complex of Kilauea Volcano.

Earthquake categories are: Kilauea Summit 30 km, earthquakes from a source about 30 km beneath the

summit region; Kilauea Summit long-period, earthquakes characterized by low-frequency waves that

originate roughly 5 km beneath the summit region; Kilauea Summit Shallow, earthquakes a few km

deep in the caldera region; sW Rift and Kaoiki, earthquakes along the-southwest rift zone of

Kilauea and the adjacent portions of the Kaoiki fault system; Upper East Rift, earthquakes from the

upper east rift zone and the adjacent fault systems of Kilauea's south flank; Koae, earthquakes

along the northeast-trending Koae fault system south of the caldera; Lower East Rift, earthquakes

from the lower east rift zone of Kilauea; Offshore Puu Pili, offshore earthquakes mostly southeast

of Puu Pili (PPL) station.

rm

Tremor Earthquakes

(m • minutes

Date h - hours) Kilauea Summit (1972) SW ri£t Upper Lower Offshore

Inter- Long and east east Puu

Deep mediate Shallow 30KM Period Shallow Kaoiki rift Kose rift Pili Remarks

+'

Oct. 1 t+-t 14 269 21 14 6 1 2 H .r-t

2 yn o H 17 245 21 22 3 1 s rc:

3 1 Q)+'+' 7 7 ? ? ? ? Electrical sto H (J) s::

4 +' 0 191 119? 2? ? 2? ? Q) S

5 Q) ? ? ? ? ? 1 +' H Q)

6 42!D- ~:S 21 19 218 12? 34 ?

7 Q) Pc 16 170 10? Z7 1 1 ro~+>

8 o 13 2fn 15? 53 1 a Q) 0

9 ~~ 48 202? 1 361 ? o tlO

10 ....., 2 13 326 91 52 2 a 0

a o'.a H ...:Jt'H.....,

11 8 488 14 35 21

12 16 672 22 28 1

13 21m 5ffi 24 2587 12? 40 4 1

14 1 41 l32? 18 22 15 2 1

15 ? 20m? I? 90? 242? 191 12? 5? 2

16 1 49 499 6? 21 9

17 gm 1 56 753 23 25 10 3

18 5

ID lam 1 78 795 14 30 6?- 1

19 13m 61 685 17 27 10

20 10m 28 410 16 11 9 1

21 1 19 246 12 32 10 2

22 15m? 1 51 216 18 13 9

23 JIll 17m 1 68 167 18 15 4 1

24 10m? lam? 69 206 17 11 6·

25 62 193 13 13 4 2

26 35m 3m 3 107 265 26 27 7

Z7 109 319 17 62 2 2

28 64 295 26 55 .3 2

29 1 24 229 23 27 8 1 1

30 2 26 228 12 18 9 1

31 1 44- 234 17 16 13

J
Tremor Earthquakes

(m - minutes

Date h - hours) Kilauea Summit (1972)

SW rift Upper Lower Offshore

Inter- Long and east east Puu

Deep mediate Shallow 30KM Period Shallow Kaoiki rift Koae rift Pili Remarks

+'

Nov 1 lorn H ·rt 82 180 13 14 8 3

2 ~~~ 6.3 260 11 41 8 2

3 H CIl 5=: 5.3 217 21 35 8 2

4 47mt +> ttl 0 Q) a 38 246 12 42 3 2

S Q)

+> H Q) 32 198 6 19 8 1

6 roQ)~

H o..+' 53 264 23 24 2 2

7 8m? Q) 0.. ra +' 117 208 17 18 13

8 6JI1 o ;:j

s Q) 0 35 237 15 36 11 1

9 4m ..c:..c: o +> ttO 42 248 13 28 6

10 +' ;:j 1 39 349 19 26 11 1

o

~a~H H~+>

11 4

m 54 321 6 46 6

12 yn 31 187 5 29 9 1

13 9m 25 200 14 27 4 9 14 1 3 205 37 20 "7 1 15 28 297 11 19 6 2 16 20 244 15 16 3 3 17 3m 12 352 27 49 10 1 18 6ID 19 332 22 39 4 4 19 2 29 297 14 30 11 1

20 1 31 187 10 28 18 1

21 2 25 237 7 15 2 2 22 1 37 167 11 33 5 1

23 7m 30 182 15 28 8 1

24 5m 2 72 191 20 20 11

25 1 106 176 24 29 10 26 8m 117 137 17 11 8

27 ~1l 147 174 12 28 14 28 Sm 166 146 7 18 7 2 29 SID 221 169 6 15 7 2 30 13m 15m 309 193 23 7 8

4
Tremor Earthquakes (m • minutes

Date h • hours) Kilauea Summit (1972)

SW rift Upper Lower Offshore Inter- Long and east east Puu Deep mediate Shallow 30KM Period Shallow Kaoiki rift Koae rift Pili Remarks

Dec 1 c;n ~~ 1 176 212 25 24 2 2 J.ZJll? 4m ::s 270 235 25 40 2 3 3 sm ~] 126 206 13 22 8 2 4 8JIl ~~ 1 150 124 9 16 2 5 H~

~~rc: 174 225 16 20 2 6 ID1Jl? 3m Q)H~ 198 229 17 13 1

7 3m H s:: 37 222 25 29 5 2 ~~o

8 4

m Q) S 18 248 25 18 10 1

9 +JQ)(1) '" 2 17 261 38 22 18 1 10 3m HF-t+' 2 14 350 21 22 9 1 Q) Q)

'lj 04+l

g. 6

11 3 14 222 30 22 7 2 12 2m 3 25 174 13 17 4 13 19 174 23 36 4 1 3 14 2 11 183 31 18 5 6 15 1 19 176 20 21 2 2 16 am i7 286 24 22 2 1 17 32 360 12 18 4 18 4QDl 1 53 154 15 19 12

19 f:lD. 55 108 26 15 9 20 1 64 164 23 19 11

-21 54 184 19 19 6

22 4m 3 42 156 31 24 9

23 2JDl 48 133 21 34 2

24 10m 1 97 117 20 23 2 1

25 21m 63 128 16 19 2 1

26 8m 177 98 13 21 2

27 IjD 37 1461 15 2l 2

28 JIll 33 120 22 19 4

29 21 159 11 19 2 2

30 30m gn 14 146 21 23 1 1

31 4m 33 150 25 28 4 2

5
Table 2 is a chronological listing of successfully located earthquakes. For each event the following data are presented:

Origin time in Hawaiian Standard Time: date, hour (HR), minute (MN),

and second (SEC).

Epicenter in degrees and minutes of North latitude (LAT N) and

West longitude (LONG W). Poor convergence of the epicenter solution

is indicated by"?".

Depth - depth of focus. in kIn. Assumed depth is indicated by "*"

- standard error of the depth in kIn.

Mag

NO

GAP

DMIN

ERT

ERR

ERZ

MD

- magnitude, if determined.

- number of stations used in locating earthquakes.

- largest azimuthal separation in degrees between stations.

- epicentral distance in km to the nearest station.

standard error of the origin time in seconds.

standard error of the epicenter in kIn.

- mean deviation of the time residuals. l= Ri

2

INO ] 2Where

R. is the observed seismic wave arrival time less the coro1

d · h .th · pute tlme at tel statlon.

Q - solution quality of the hypocenter. This measure is

intended to indicate the general reliability of each

solution:

g Epicenter Focal Depth

A excellent good

B good fair

C fair poor

D poor poor

Q is based both on the nature of the station distribution with respect

to the earthquake and the statistical measures of the solution. These

two factors are each rated independently according to the following

scheme:

6
Station Distribution

NO GAP DMIN

A > g < 1200 < DEPTH or 5 kIn

B > 6 < 1500 < 2 x DEPTH or 10 km

C > 6 < 225 0 < 50 KIn

> 4 < 1800

D Others

Statistical Measures

ERH(km) ERZ(lan) MD (sec) RMAX(sec)*

A < 1.0 < 2.0 < 0.10 < 0.25

B < 2.5 < 5.0 < 0.20 < 0.50

C < 5.0 < 0.30 < 0.75

D Others

Q is taken as the average of the ratings from the two schemes, that

is, an A and a C yield a B, and two B's yield a B. When the two

ratings are only one level apart the lower one is used, that is,

an A and a B yield a B (Hamilton and others, 1969).

The criteria for Q are the same as used by the Office of Earthquake

Research and Crustal Studies, U. S. Geological Survey.

*RMAX is the maximum residual

7
Table 2. SUMMARY OF SEISMIC EVENTS

1912 HR MN SEC LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH ERZ MO Q

OCT 1 2 15 36.4 19-19.0 155-14.41 8.1 l.~ 23 145 5.7 0.07 0.5 0.4 0.12 B

1 6 52 33.1 19-17.8 15S-14.3 12.5 1.7 9 229 7.0 0.30 1.1 2.3 0.06 C

1 6 S3 28.4 19-1H.l 15S-1t1.0 2Q.O 0.9 19 145 1 • 1 0.16 0.9 1.6 0.10 B

1 15 4q 27.4 19-19.6 15~-13.8 H.O· 0.5 15 162 6.4· 0.09 0.7 0.11 C

1 17 25 56.~ 19-19.7 155-11.6 9.8 0.6 16 166 5.4 0.08 0.6 1.1 0.09 Ii

1 18 ~,,9 4.6 lq-26.1 1~5-50.7 4.4 0.9 11 249 26.5 0.32 2.0 0.8 0.08 C

1 21 3t, 10.8 18-54.1 155- 8.6 1<;1.3* 0.6 15 272 44.2 0.34 2.4 0.15 0 "2 2 34 52.6 19-20.0 lS5-11.4 7.A 0.4 16 162 4.6 0.12 1.0 0.5 0.14 C

2 6 11 3.4 lQ-25.4 155-31.0 37.5 1.5 13 100 11.3 0.24 0.9 2.7 0.10 B

2 6 16 30.3 19-30.1 155-52.9 26.6 1.5 23 195 20.0 0.23 1.1 2.7 0.10 C

2 10 11 2A.4 19-45.8 155-l5.2 27.8 1.7 15 q4 4.5 0.24 1. 1 2.8 0.13 B

2 11 24 53.0 19-20.4 1~S-12.2 B.O· 0.1 13 155 5.1 0.11 0.9 0.15 C

2 15 4 1~.1 19-45.9 1~5-23.3 26.4 1.0 9 163 14.6 0.19 1.3 2.3 0.08 C

2 20 41 2?J 19-17.9 155-12.81 7.1 2.5 24 162 8.3 0.12 0.7 0.6 0.15 C

2 20 42 35.4 19-18.3 155-12.1 M.O· 0.3 8 232 8.6 0.28 1.8 0.14 0

2 20 43 3f,.6 19-18.8 lSb-12.R 8.0" 0.4 7 222 R.O 0.25 1.9 0.13 C

2 22 22 3q.4 19-18.8 I5S-I2.A Ii.O" 10 220 ti.o 0.25 1.6 0.17 C 3 3 49 30.4 1~-19.0 155-13.1 R.O* 0.4 H 214 7.8 0.11 1.2 0.11 C 3 12 51 1A.7 19-20.4 155-13.5 8.0* 0.0 10 150 6.8 0.10 0.9 0.15 C

3 13 42 17.1 19- q.O 155-38.8 3.3 0.2 7 lA'J 11.3 0.19 1.5 1.6 0.09 C

5 11 57 52.4 19-21.9 155-16.2 4.5 1.0 9 lq4 1 .1 0.20 1.6 1.1 0.16 C 5 15 47 51.9 20-11.9 ISS-51.fl 32.7 2.4 12 312 11.5 1.BO 9.5 11.1 0.13 0 6 1 4 21.2 19-18.2 155-16.1 1.0 1.4 13 267 9.7 0.45 2.1 1.6 0.21 0 6 3 41 38.6 19-10.8 155-15.2 40.0 2.1 15 194 22.7 0.28 1.5 2.7 0.14 C 6 a e 52.4 19-30.8 155-42.1 A.2 7 164 12.1 0.13 1.3 1.9 0.09 C

6 22 53 43.1 19-26.1 155-24.8 8.0* 1.9 8 97 7.4 0.05 0.5 0.07 B 8 5 21 2A.l 20- 2.7 155-?2.9 ,q .8 3.2 18 216 17.6 0.26 1.4 1.8 0.14 C 8 A 55 21.6 20- 2.5 155-23.0 q.4 2.3 13 216 17.4 0.26 1.6 1.6 0.13 C 8 Q 5 A.4 19-11.8 155- 6.61 0.0 1.9 14 216 9.7 1.31 1.9 13.5 0.18 C 8 10 2 0.8 19-14.5 IS4-59.01 34.2 12 251 23.5 0.53 2.9 3.6 0.11 0

8 15 57 30.5 lQ-20.1 15~-25.31 1.9 2.1 14 118 1.2 2.11 1.4 1.7 0.31 C

8 21 44 5.1 19-22.7 I55-?S.4? 0.0 2.4 14 118 12.2 5.08 0.8 9.6 0.19 C

8 23 4U q.J 19-16.5 lS5- A.4? 0.0 2.4 12 ?IH 17.'1 9.23 2.6 16.9 O.2A C

9 0 54 54.7 Jc:J-}A.3 15!l-15.0 5.4 1.1 11 709 7 •., 0.34 1.9 1.4 0.17 C

9 1 0 22.8 19-22.5 155-25.3 3.8 1.7 14 102 11.4 0.10 0.9 1.3 0.20 C

q 8 1:4 30.3 19-21.8 155-24.5"/ 0.0 1.5 9 15/t 12.5 7.40 1.0 14.1 0.12 C

9 11 1'6 1 .1 }{J-20.2 155-11.41 9.8- 0.6 6 260 4.4 0.12 1.5 0.11 0

9 18 72 37.4 19-12.5 15b- 0.3 21.2 7 330 15.5 O.Q3 8.4 8.2 0.17 0

10 4 7 55.1 19-21.4 1~5-13.3 8.0* 1.0 9 215 4.9 0.18 1.6 0.10 C 10 7 11 23.7 19-60.0 155-24.7 11.0 2.0 7 216 14.2 0.28 2.6 2.0 0.11 C

10 10 55 5.9 19-21.7 155-14.4 2Q.O 3.0 16 litl 5.4 0.19 1.2 2.0 0.16 8 10 16 32 23.9 19-20.2 1~5-12.6 3.5 1.9 15 167 5.9 0.28 1.7 1.9 0.28 C 10 18 49 2~.1 19-21.5 155-12.8 6.0 1.6 12 175 5.3 0.23 1.9 0.9 0.21 C 10 20 14 5R.R 19-21.4 15~-25.1 3.0 2.1 14 152 14.4 0.10 0.7 1.0 0.15 C 10 20 21 21.H 19-20.5 15~- 8.01 9.2 2.0 9 262 4,4 1.15 1.3 4.3 0.16 0

10 20 32 34.8 19-20.8 155-13.21 A.O" 1.7 9 232 5.6 0.44 3.0 0.12 0 11 4 2S 18.5 19-31.8 155-12.4 H.O· 9 160 23.8 0.06 0.5 0.05 C 11 20 37 59.2 19-25.8 155-27.41 8.2 2.9 17 113 10.3 0.12 0.8 0.8 0.15 C 11 21 32 9.9 19-23.6 15S-26.A? 6.7 2.4 14 132 12.5 0.10 0.8 0.9 0.16 B

8
SU~~ARY OF SEISMiC EVENTS (CONTINUED)

1972 ...H MN SE:C LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH ERZ MD Q

OCT 12 1 40 27.8 19-19.3 155-15.5 6.3 2.4 13 212 5.7 0.29 1.7 1.0 0.16 C

12

12

20

16 16 16.5 19-19.1 155-25.2 7.1 2.0 12 170 12.B 0.20 1.1 1.2 0.14 C 16 16.5 lq-22.3 15S-?5.9? 6.9 1.~ 15 151 11.2 0.12 1.0 2.6 0.15 C 12 21 14 1£,.5 19-18.4 I~S- 6.9? 0.0 2.3 17 ~29 8.6 5.22 1.7 9.6 0.19 0 13 7 34 47.1 19-19.9 155-13.9 6.5 2.6 17 197 5.~ 0.15 1.0 0.6 0.18 C 13 14 27 53.6 20- 0.6 155-24.7 9.2 2.0 8 21d 15.1 0.31 2.4 2.1 0.11 C

13 17 27 52.7 19-17.2 155- 7.0? 0.0 0.9 15 217 10.4 5.86 1.6 10.8 0.21 C 13 18 19 46.0 19-27.3 155-24.81 6.9 1.4 15 91 5.4 0.09 0.8 1.9 O.IQ R 13 22 44 12.3 19- 8.7 155-29.6 27.0 1.2 17 159 3.4 0.22 1.3 2.4 0.15 C 14 8 4 26.1 19- B.2 155-24.1 34.3 7 261 1.1 0.87 3.4 6.9 0.05 0 14 8 18 2q.1 19-20.0 lSS-14.7 9.8 0.7 16 164 4.7 0.10 1.0 1.0 0.16 C

14 19 57 0.5 19-19.3 lS!J-12.3 8.0* 0.9 9 236 6 •., 0.36 2.3 n.17 0 14 21 52 13.1 1'l-17.3 155-14.6 11.8 1 .1 9 ?45 1.0 0.30 1.3 2.4 0.0" C 14 23 17 1~.8 19-36.3 15~-lQ.2 A.O* o.s 7 261 13.9 0.53 3.0 0.12 0 15 0 26 28.4 19-20.9 1~5-23.6 7.6 2.3 14 162 1.4 0.13 1.1 0.6 O.l~ C 16 J. 14 47.3 19-33.1 15b-13.9 1.9- 1.2 12 266 43.5 0.48 3.2 0.18 0

16 6 &9 IH.B 19-22.8 155-24.81 7.5 O.ft 9 158 5.4 0.13 1.0 0.9 0.14 C 16 8 3\7 28.1 19-19.9 15~-14.6 6.5 1.5 20 167 s.o 0.14 1.0 0.7 0.22 C 16 10 42 5].8 19-30.A 155-42.3 1.3 1. 1 11 161 11.5 0.19 1.1 1.1 0.14 C 16 10 58 20.6 19-25.4 155-28.9 6.8 0.6 11 110 12.8 0.01 0.8 0.9 0.08 8 16 16 4 15.0 19-54.9 155-29.6 39.4 1.5 13 270 15.2 0.78 3.5 5.1 0.09 0

16 17 39 57.2 19-22.0 155- 4.7? 0.0 1.1 15 247 q.l 1.12 3.5 20.2 0.21 0 16 19 34 33.8 19-1A.9 155-15.7 10.9 0.4 10 149 1.5 0.14 0.6 1.2 0.05 B 16 23 43 2q.2 19-22.2 155-13.5 3.1 9.9 8 190 3.6 0.08 0.4 o.q 0.04 R

17 2 2 57.1 19-24.0 155-23.9 0.5 0.2 14 124 7.1 0.66 0.8 1.2 O.IA B 1"1 5 9 17.7 19-17.3 1~5-14.~ 9.f) 0.7 11 236 6.7 0.29 1.6 2.5 0.11 C

17 5 9 37.4 19-11).1 1~5-14.3 8.0* 0.6 10 259 8.4 0.59 3.5 0.24 0

17 10 42 19.8 19-24.3 155-16.81 7.9 7 76 1.1 0.29 0.8 11.9 0.21 C 17 13 5 13.1 19-24.8 155-24.1 8.0· 9 199 8.0 0.08 0.5 0.07 C

11 14 ·50 18.5 19-1Q.A 1~5-16.9 9.5 1.3 7 204 1.1 0.13 0.6 o.~ 0.02 a

17 15 50 9.5 19-23.3 155-28.6 5.4 0.5 14 A1 10.9 0.10 0.8 1.1 0.19 C

18 3 34 57.9 19-20.9 155-11.61 0.6 9 192 3.1'4 0.92 1.4 1.7 0.16 C

18 1 1 16.1 19-20.3 155- 4 .• 61 0.0 1.4 14 209 9.7 5.90 1.6 11.0 0.20 C

18 7 22 3.9 19-20.4 155-12.5 ft.O 1.5 20 182 3.13 0.14 1.0 0.1 0.21 C

18 11 17 58.1 19-24.2 155-23.8 4.0 1.3 12 192 7.2 0.19 1.1 1.9 0.16 C

18 13 52 37.4 19-26.8 155-45.4 6.6 1.8 11 223 17.2 0.15 1.1 0.7 0.07 C

18 14- 15 35.5 19-19.0 155-15.7 111.2 1.7 7 218 3.6 0.12 0.6 1.0 0.03 B

18 14 41 31.0 19-27.8 155-14.4? A.O" 1.4 7 3?3 4.8 0.60 5.5 0.44 0

18 15 1 34.6 19-19.7 1~5-15.7 30.2 2.4 20 161 3.1 0.18 1.1 1.6 0.12 C

18 16 14 8.4 19-25.9 1~5-39.5 8.0" 7 299 d.7 0.92 4.9 0.07 0

18 19 59 56.6 19-15.7 155-35.5 3.6 1.8 13 157 3.2 0.14 1.7 1.3 0.19 C

18 20 28 12.5 19-22.1 155- R.a 31.3 O.A 14 135 10.9 0.30 1.3 2.1 0.10 H

18 22 9 47.,+ 19-1Q.6 155- a.s? 7.3 0.3 14 186 ~.l 0.12 1.0 0.5 u.15 C 18 22 36 8.2 19-24.0 1~5-15.7 1.7 0.8 1 121 2.5 0.08 0.4 0.4 0.09 B

18 22 S6 39.1 19-32.1 155--:;8.61 41.6 1.6 11 292 31.8- 0.16 1.A 1.7 0.07 C 18 23 4 45.1 19-20.1 155- 8.6 8.2 0.1 1 164 4.1 o.o~ O.M 1.5 0.06 8

18 23 \i5 2~.7 19-24.8 155-1b.9 0.6 0.1 8 87 0.2 0.09 0.3 0.2 0.09 A

19 4 i\4 59.9 19-30.1 155-33.01 3.1 1.2 12 313 Ib.9 3.40 7.4 11.3 0.13 0

19 6 20 4Q.9 19-10.5 155-20.4 42.5 1.4 13 178 13.3 0.28 1.2 2.6 0.10 C

9
SUMMARY OF SEISMIC EVENTS (CONTINUED)

LONG W DEPTH M~G NO GAP OMIN ERT ERH ERZ MD Q 1912 HR MN SEC LAT N

OCT 19 6 23 44.8 19-11.3 IbS-20.7 45.1 2.A 20 173 12.0 0.20 0.9 2.0 0.08 B

19 7 32 1.4 19-1fl.8 155-14.0 ti.O" 12 209 6.4 0.17 1.2 0.15 C

19 7 40 49.4 19-22.1 155-27.4 ~.O I? 128 8.0 0.17 1.2 3.3 0.22 C

19 10 43 44.2 19-1H.q 15~-1].3 5.5 1.2 11 152 7.5 0.14 1.0 0.9 0.22 C

20 0 42 3.2 ~o- 1.7 155-~2.Q 10.1 2.1 18 213 15.8 0.24 1.4 1.6 0.16 C

20 5 6 57.7 19-31.& 156- 9.6 14.5- 1.3 20 252 31.9 0.26 1.8 0.11 0

20 5 9 19.8 lY-20.1 155- 8.4 8.0 0.1 11 166 4.~ 0.13 1.2 2.4 0.11 C

20 6 54 27.0 19-20.3 ISS-II.A 9.7 0.3 11 157 4.2 0.11 0.9 1.5 0.10 B

20 8 32 41.S 19-22.5 155-75.11 8.2 0.4 16 93 5.4 0.08 0.6 0.5 0.13 B

20 10 0 11.6 19-2?1 155-25.6 6.3 1.0 14 70 5.4- 0.10 0.8 0.8 0.17 B

20 17 37 20.6 19-22.9 155-49.4 R.O 0.6 10 221 13.6 0.17 1.4 1.4 0.07 C

20 18 59 15.1 19-20.0 155- 8.6 5.5 2.5 25 149 4.3 0.15 1.0 0.8 O.2~ C

20 22 15 26.4 19-27.1 155-21.~ 2.6 1. 1 17 71 8.9 0.08 0.5 0.9 0.13 B

21 2 13 25.3 19-21.9 1~5-12.7 4.8 1.0 13 133 1. 1 O.lc 0.6 1.4 0.14 R

21 5 6 45.2 19-1A.h 155-14.9 9.6 0.3 11 20& 5.2 0.28 1.4 2.5 0.11 C

21 42 9.4 lC)-13.5 15S-3~.3? 9.4 1.2 11 82 4.0 0.1·' 1.2 1.4 0.22 8

21 12 4 0.1 19-24.2 15~-1~.7 2.6 1.3 7 117 2.4 0.16 0.5 3.6 0.07 B

21 18 lQ 3?q 1~-lQ.4 155-10.3 8.0· 0.8 11 174 5.0 0.09 0.1 0.10 C

21 21 21 0.4 lq-~O.1 1!;5-1~.9 A.3 0.9 13 160 2.6 0.14 1.1 1.6 0.14 C

21 21 43 A.8 19-1R.5 155-12.5 8.0· 0.1 6 230 8.0 0.26 1.8 0.08 0

22 3 1 41.1 19-28.5 155-16.31 8.0* 1.3 8 299 5.6 0.40 3.7 0.39 0

22 5 33 49.0 19- 1.8 155-12.0 1.3.7· 1.0 11 284 22.1 0.49 3.3 0.18 0

22 8 10 59.4 19-20.4 1':)5- A.4 4.0 1.3 lq 161 '•• 1 0.15 1.1 1.1 0.22 C 22 19 20 34.& 19-19.3 155-1'1.4 ~.Oo 0.3 12 2?6 S.8 0.16 1. 1 0.08 0 23 0 24 30.1 19-24.0 155-11.0 1.2 1. 1 12 72 1. 1 0.11 0.6 0.1 0.10 A 23 13 28 34.2 19-21.4 155- 6.9 R.O· 0.3 9 152 7.5 0.17 1.7 0.22 C 23 1& 44 33.8 19-22.0 155-25.0 10.8 0.9 11 134 4.5 0.12 0.8 1.9 0.10 R

?3 22 ~'" 3 4Q.3 19-22.0 155-25.~ 5.9 1.7 22 61 5.5 0.09 0.6 0.7 0.18 8 24 6 ~2 lR.S 19-1A.4 15S-1S.1 11.9 0.3 8 209 5.1 0.18 0.7 1.4 0.04 8 24 7 23 42.() 19- 9.8 155-23.5 33.1 0.8 1& 202 7.6 0.37 1.6 3.2 0.11 C 24 I-I 53 37.0 19-13.2 1:;5-27.5 4.2 0.7 10 124 6.~ 0.10 1.0 1.4 0.16 B 24 13 0 37.4 19-22.5 155-24.4 6.9 1.9 22 51 4.6 0.07 0.6 0.6 0.19 B

24 21 52 10.5 19-20.6 1S~- 7.5 A.O* 0.5 12 156 4.9 0.14 1.3 0.19 C 25 3 51 54.4 19-19.7 155-12.7 8.0· 0.1 9 204 ft.7 0.31 2.5 0.21 C 25 5 33 ?4 19-18.7 155-11.6 3.5 2.1 22 179 (,.9 0.19 1.0 1.2 0.27 C 25 7 28 1:?6 19-22.6 155-26.7 2.6 1.7 16 75 7.4 0.11 0.8 1.6 0.22 C 26 2 6 14.5 19-20.!:) 155-12.71 4.3 0.9 14 186 S.d 0.24 1.4 1.5 0.26 C

26 5 0 54.7 19-21.6 151)- 8.9 11.8 0.9 12 149 11.0 0.11 1.0 1.1 0.09 B 26 12 32 47.4 1~-19.A 1~~-13.1 8.0*-0.0 9 160 b.2 0.08 0.8 0.10 C 26 17 49 7.0 19- 7.8 155-33.0 5.6 2.3 12 145 9.6 0.13 1.0 1.1 0.14 B 26 20 15 5".9 19-23.9 155-11.4 b.a 1.0 17 46 1.2 0.08 0.7 0.6 0.19 B 26 23 8 49.3 19-19.5 155- b.9 B.O· 0.6 14 118 b.9 0.17 1.4 0.18 C

27 3 16 24.4 19-24.0 1~5-28.7 7.0 1 .1 19 57 11.8 0.08 0.6 0.6 0.18 B 27 3 18 5A.4 19-20.6 1~5-20.1 1.7· 9 111 4.8 0.06 0.4 0.09 B 27 4 31 2.1.9 19-21.6 155- 7.1 1.8 3.0 20 171 S.O 0.14 1.0 0.6 0.15 C 28 1 2 24.1 19-21.0 155 -1 1 .5'i· A.O 1.1 11 181 3.3 0.09 0.1 O.~ 0.11 C 28 1 35 36.5 19-22.3 155-i!4.3? 1.4- 2.0 20 51 4.3 0.01 0.6 0.1 0.18 B

10
SUMMARY OF SEISMIC EVENTS (COI\jT I NUED)

HH SEC LAT N LONG W DEPTH MAG NO GAP OMIN ERT ERH ERZ MO Q 1912 MN

OCT 28 2 25 3.0 19-16.5 155- 4.0 3::4.4 16 tJ66 14.5 0.39 2.2 2.4 0.08 C

28 b 5 57.4 19-22.2 15S- ~.l? 7.1 1.8 18 119 1.4 0.12 1.1 1.4 0.15 C

28· 9 27 43.4 19-25.5 IS!)-?S.2? 1.4- 1.7 19 82 ij.6 0.09 0.7 0.7 0.15 B

28 10 2 42.1 19-15.2 155-18.6 8.3 10 250 5.1 0.44 2.6 2.8 0.13 0

28 18 2'J 24.1 19-28.5 155-20.4 8.5 15 97 1.& 0.06 0.7 o.a 0.10 A

29 5 44 1~.7 19-1f».3 15~-49.4 4.3 2.7 17 140 5.0 0.14 1.4 1.3 0.18 B 29 15 35 24.4 19-22.6 155-23.41 7.1 0.8 l~ 122 4.5 0.09 0.7 1.5 0.16 8 29 18 55 56.3 19-20.1 15~-12.4 f,. 1 9 1R4 5.2 0.56 1.4 4.3 0.13 C 29 21 25 5<).8 19-21.1 155- A.l q.2 0.3 8 729 3.6 0.22 1.6 1.6 0.09 C 30 0 46 3) .0 1~-19.q 155-46.5 5.6 0.9 11 172 12.5 0.12 1.0 1.1 0.10 B

30 2 4'6 4A.l 19-25.6 155-.25.3 B.O· 11 1~1 8.6 0.12 0.8 0.10 C 30 3 5'2 0.9 19-24.6 155-14.5 2~.3 1 • 1 15 qO 0.4 0.21 1.1 2.0 0.11 8 30 15 11 37.1 19-t?2.0 15'i-?5.3 ~.l 1.1 18 68 4.8 0.10 O.B 0.8 O.~2 B 31 1 0 31.9 19-26.1 155-21.31 11. 1 2.8 20 69 9.8 0.11 0.7 0.7 0.17 B 31 1 4ft ?9 19-17.6 155-23.7 A.O*-O.l 11 120 4.8 0.14 1.4 0.26 B

31 2 43 3(,.2 19-19.5 155-11.9 28.4 1.0 13 131 1.4 0.19 1.1 1.8 0.10 B 31 4 35 42.7 19-19.0 155-13.e ~.o· 0.5 10 206 6.6 0.18 1.3 0.14 C 31 5 26 59.0 l~-I'Q .4 155-15.9 CJ.9 8 2~5 2.9 0.28 1.4 1.8 0.06 C 31 8 55 S?5 1~~ ~.H 1~S-]~.4 S .1 2.5 17 107 9.6 0.17 1.2 1. 1 0.23 C 31 11 43 54.9 1~-22.3 155-22.9 1.4 0.6 8 116 3.8 0.10 0.8 2.3 0.11 R

31 15 52 40.3 19-23.7 155-26.1 8.0· 1.2 11 R8 8.1 0.07 0.6 0.14 C 31 11 33 SA.6 19-4q.2 155-32.1 27.3 1.6 20 133 9.l 0.14 0.9 2.1 0.10 B 31 17 49 4.0 19-14.2 155"21.4 27.6 1. q 19 119 8.4 0.19 0.9 1.8 0.10 8 31 22 2 35.8 19-1~.6 1~'5·13.4 5.9 1.2 18 199 7.2 0.17 1.0 0.8 0.18 C 31 23 24 43.2 19-20.4- 155- ti.7 5.9 1.4 17 195 3.6 0.22 1.5 1.0 0.20 C

NOV 1 4 39 6.7 19-22.1 155-29.51 3".2 1.4 17 66 II.S 1.12 1.0 8.5 O.2? C 1 4 54 2.6 19-24.3 155-17.f, H.3 1.2 8 142 1.6 0.14 0.7 1.3 0.06 B 1 9 21 23.2 19-20.2 155-11.3 9.9 11 215 4.2 0.24 1.2 2.3 0.10 C 1 11 6 30.1 19-24.'2 155-17.3 13.8 1. 1 9 80 2.3 0.06 0.5 0.8 0.05 A 1 12 lA 30.2 19-?O.6 lb5-12.7 6. ) 2.4- 21 173 3.5 0.12 0.9 0.5 0.18 C

1 12 42 ·25.9 19-22.5 155- 4.1 R.O" 7 251 10.2 0.27 1.Q 0.04 0 1 14 10 17.8 19-2?1 15S-13.4 ~.3 6 111 1.5 0.16 0.6 1.8 0.02 R 1 14 25 32.0 19-10.7 155-32.1> 7.0 2.5 19 106 8.6 0.13 1.0 O.M 0.19 C 1 17 0 1 ~.-f 19-20.2 1!:)5-13.1 7.5 0.4 11 204 4.2 0.15 1.0 0-.6 0.11 C 1 21 4 30.9 18-54.2 155-17.2 q.7 2.8 Zl 262 33.9 0.61 3.3 3.2 0.16 0

2 0 46 44.8 18-54.5 155-}6.6 A.4 1 • 1 12 280 34.0 0.35 2.1 2.2 0.11 C 2 4 4 5.0 19-31.9 1~5-45. 0'1 ~.o 0.9 b 300 34.2 0.30 1.4 2.0 0.05 C 2 1 2 34.8 19-20.~ lS5-13.A 1.7 0.3 10 212 4.2 0.20 1.2 0.7 0.11 C 2 16 1A 19.3 1~-20.0 1~5- 7.31 0.0 .2.5 20 241 5.~ 1.SS 2.2 13.1 0.23 0 2 17 25 32.9 19-39.3 1~b-?5.!' R.O· 3.3 20 279 72.3 0.60 3.8 0.15 0

2 20 ~-24 A.l 19-20.9 1~5~ 9.7 7. -, 2.1 17 IHS 2.2 0.08 0.7 0.8 O.Oq C 2 21 13 32.5 19-20.~ 155-11.61 5.6 1.7 1~ 194 3.9 0.32 1.9 1.8 0.26 C 2 22 30 41~O 19-22.4 155-?3.6? ?.7 1.6 15 111 4 .1 0.12 0.9 2.1 0.23 8 3 ·b 34 34.9 19-21.0 15~-12.9 6.3 1.9 18 112 2.8 0.15 1.2 0.7 0.24 C 3 10 19 37.5 19-19.8 lS5-11.Q 8.0· 11 213 5.5 0.14 1.0 0.10 C

3 13 16 2A.O 19-10.8 155-21.Q 2q.6 15 126 2.5 0.27 1.5 2.8 0.14 A 3 17 34 37.8 19-18.0 15~-13.0 R.O* 9 ~33 8.7 0.28 1.9 0.14 0 3 17 35 51.7 19-23.6 155-26.3 8.1 2.1 17 72 8.2 0.10 0.5 0.7 0.11 R

11
SU~M/i.HY OF SEISMIC EVENTS (CONTINUED)

1972 HH MN SEC LAT N LONG W DEPTH MAG NO GAP OMIN EHT ERH ERZ Mn Q

NOV 3 17 47 51.0 19-18.2 1!jS-13.0 fl.O* 1.7 10 230 8.4 0.24 1.6 0.13 0

3 23 47 33.0 19-20.8 155-19.2 3.7 1.6 12 92 3.4 0.04 0.3 0.6 0.06 A

4 3 56 14.9 19-10.5 15~-27.S 31.5 21 139 2.0 0.23 1.3 2.4 0.14 B

'+ 4 24 45.8 1~-23.3 ISS-26.7 A.O* 8 253 8.3 0.31 1.9 0.09 0

4 11 52 1.8 19-41.0 156- 8.1 10.4 3.9 26 206 60.2 0.33 1.6 4.9 0.17 C

4 14 36 lR.S lq-lQ.7 l55-11.q 4.1 1.7 15 216 5.3 0.28 1.5 1.5 0.2S C

4 16 58 11.4 19-19.~ 155-11.9 b.l 1. h 13 220 5.6 0.31 1.9 1.1 0.22 C

4- 20 0 37.3 14-21.1 155- 4.81 0.0 2.0 14 203 9.1 5.96 1.7 11.2 0.19 C

4 22 23 29.1 19-22.0 155-21.3 1.7 1.9 14 79 1.8 0.09 0.1 0.7 0.11 B

5 4 12 3.4 18-53.6 155-26.31 21.<J* 20 2ft2 25.8 0.34 2.6 0.15 0

5 5 45 21.0 19-17.6 1~5- 6.0 30.5* 13 2~6 19.4 0.35 3.0 0.09 0

5 11 15 lQ.A 19-20.5 155-12.3 9.8 0.1 12 191 3.6 0.29 1.3 2.4 0.10 C

6 6 44 22.8 19-20.3 155-12.7 5.9 1.4 21 168 4.0 0.13 1.0 0.1 0.22 C

6 9 56 54.8 19-21.2 155-30.01 7.2 2.0 13 1.58 10.n 0.19 1.6 1.4 0.17 C

6 11 15 2.1 19-24.9 155-28.8 4.9 13 116 13.0 0.11 O.A 1.3 0.14 C

6 14 54 13.1 1~-20.4 155-14.1 6.5 14 172 4.8 0.18 1.1 1.0 0.18 C

b 19 32 3.3 19-20.6 155-12.1 5.(t 1.9 21 166 3.4 0.14 0.9 0.1 0.21 C

6 21 1 47.9 lq-24.5 155-76.71 0.0 1.8 12 211 9.9 5.52 1.2 29.6 0.18 C

7 1 53 34.1 19-17.1 155-13.0 A.O· 10 249 9.6 0.32 1.9 0.11 0

1 7 0 ] .9 1~-20.A 155-12.4 e.o· 8 181 5.1 0.07 0.6 0.05 C

1 9 44 0.2 19-24.1 155-29.1 4.5 1.4- 17 5~ 12.5 0.10 0.8 1 • 1 0.22 C

7 11 35 52.6 lY-2h.4 155-?4.7 6.0 1.6 19 be o.A 0.07 0.6 0.7 0.18 B

7 12 ~,. 9 ?6 19-1q.7 155~11.3 13.1 8 ?40 5.7 O.1~ O.A 1.0 0.0"3 C

7 13 93 5.4 lQ-20.8 155-2H.2 4.0 2.1 18 128 ~.7 0.11 0.8 1.0 0.20 C

7 14 6 0."3 19-20.1 155-11.0 6.7 0.3 7 190 4.1 0.22 1.0 1.2 0.07 C

7 2-0 19 33.6 18-~1.5 155-1n.3 11.7 0.8 12 296 48.9 0.42 1.0 15.3 0.11 0

7 22 3~ 33.8 19-24.1 155-11.7 3.9 6 125 l.~ 0.19 0.1 1.1 0.05 B

8 1 3 2.6 19-24.5 155-29.2 7.0 2.1 22 58 13.0 0.01 0.5 0.5 0.15

8 1 4 10.7 19-24.7 155-29.6 4.2 1.2 15 149 13.9 0.14 0.9 1.2 0.17 C

8 1 24 34.1 19-24.3 155-2~.H 4.1 1.6 10 &1 13.7 0.11 0.8 1.3 0.19 C

8 3 32 37.6 19-23.3 155-25.91 0.1 ) •a 17 124 7.3 8.36 1.0 15.9 0.25 C

8 7 37 51.4 19-24.0 155- 4.01 20.8* 1.6 8 331+ 10.9 1.25 12.1 0.31 0

8 11 4 3~.5 19-22.4 155-23.4 4.6 1.2 9 181 4.0 0.18 1.1 1.1 0.14 C

8 18 41 38.3 19-31.4 155-50.2 5.6 2.3 12 225 25.3 0.87 1.4 6.0 0.12 C

8 20 46 31.5 19-31.6 155"42.7 R.B 1.9 10 241 12.5 0.17 1.0 0.8 0.06 C

8 22 11 11.6 19-53.9 155-18.9 8.0* 2.3 8 324 45.1 1.06 1.8 0.28 0

9 1 30 4Q.• 5 19-59.5 155-38.01 2?3 1.9 11 155 21.5 0.91 3.1 9.2 0.33 0

9 1 41 6.6 19-19.6 155-12.2 8.0* 0.9 11 167 6 .1 0.09 O.l 0.11 C

q 2 7 44.2 19-13.9 155-26.61 0.0 1.4 l~ 133 8.4 5.12 0.9 9.8 0.17 C

9 2 4h 45.6 lq-23.8 155-26.4 S.A 1.4 1& 119 8.5 0.11 0.7 1.2 O.lA B

9 6 44 57.4 19-1H.6 155- H.6 M.O· 1.4 11 189 6.7 0.21 1.8 0.20 C

9 8 51 6.6 19-11.2 155-12.51 1.9 1.6 21 169 9.1 0.13 0.8 0.5 0.15 C

9 14 42 53.7 19-31.2 155-58.3 8.2 2.7 11 263 29.9 0.43 2.7 2.9 0.19 0

9 19 59 32.9 19-20.6 155-13.1 8.0* 8 18U 5.9 0.09 0.7 0.07 C

10 0 15 10.1 19-19.4 155-13.~ 8.0· 1.2 14 199 6.5 0.11 0.8 0.10 C

10 0 31 7.5 19-18.8 155-13.2 8.0* 1.6 9 216 1.1 0.11 1.1 0.10 C 10 0 33 20.1 19-19.4 155-13.6 8.0· 1.4 8 200 6.7 0.13 1.0 0.10 C

12
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1972 HH MN SEC lAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH ERl Mn Q

NOV 10 3 40 23.4 19-1q.6 IS~-14.3 6.2 1.4 19 190 5.6 0.14 0.9 0.6 0.19 C 10 4 9 31. -, 19-20.5 155-13.3 8.0* 9 179 5.A 0.09 0.7 0.09 C 10 7 25 22.2 19-21.6 15S-2-'.O? H.l 1.3 17 102 6.~ 0-.12 0.8 0.8 0.16 !O 8 22 l6.3 19-24.0 155-16.7 13.1 2.0 16 50 1.2 0.03 0.3 O.~ 0.05 A 10 12 0 52.1 1~-19.2 155- A.~ 4.1 1.A 12 IHl 5.8 0.18 1.3 1.3 0.19 C

10 15 0 5A.7 lQ-24.4 lS~~23.(' 7.8 1.8 19 70 7.0 0.06 0.5 0.4 0.12 B 10 17 "13 46.9 19-21.3 155-24.'i 7.i? ?l 23 60 3.0 0.07 0.6 0.5 0.19 B 10 l~ 54 33~3 19-23.2 155-26.61 8.4 1.3 16 73 8.1 0.12 0.7 0.9 0.13 B 11 ·1 32 55.3 19-1H.6 155-13.1 A.O* 1.3 11 221 8.0 0.22 1.4 0.12 C 11 6 7 30.8 19-24.1 155-23.1 6.3 0.9 14 167 6.0 0.12 0.8 0.9 0.14 C

11 7 23 9.5 19-19.9 IS5-13.1? A!t 7 1.3 10 239 4.7 0.41 2.1 2.9 0.11 C 11 12 34 ~7.4 19-24.1 15~-15.7? 1.4 1.0 9 123 2.5 0.10 0.6 0.4 0.11 B 11 12 SA 5A.9 19-23.7 155-36.51 A-.5 1.3 13 122 10.3 0.11 0.9 1.1 0.14 B II 14 3 39.4 19-18.4 155-13.2 H~O* 1.5 11 224 8.0 0.19 1.3 0.12 C 11 22 34 4q.4 19-2~.~ 155-24.11 1.5 1.4 14 114 4.9 0.10 1.0 2.1 O.lA B

12 0 23 44.6 19-19.0 155-16.7 6.8 1. 1 13 154 2.4- 0.11 0.8 0.6 0.13 C 12 4t 27 5.9 19-30.1 155-27.4 6.4 ?1 20 96 7.3 0.09 0.6 0.6 0.15 C 12 6 39 15.9 19-19.2 155-15.6 10.1 1.7 A 234 3.5 0.10 0.5 0.6 0.02 C 12 18 33 3A.0 19-22.7 155-22.8 6.9 1.3 12 159 4.6 0.10 0.7 0.8 0.12 C 12 19 0 20.6 19-21.0 155- 8.5 4.3 1.8 15 150 3.0 0.13 1.0 0.9 0.18 C

13 6 15 2~~ .6 19-21.1 155-25.2 7.6 2.2 19 96 3.8 0.08 0.7 0.6 0.16 R 13 17 8 25.6 19-19.5 15S-?5.9 2.5 2.0 15 110 4.7 0.13 0.9 1.4 0.19 B 14 0 S3 57.5 19-21.8 155-23.2 A.l 8 17& 2.9 0.15 1.1 0.8 0.10 C 14 8 51 9.1 19-19.1 155-11.5 3.2 17 115 6.4 O.ll 1.3 1.6 0.29 C 14 11 2 12.9 19-20.3 155- 8.5 4.6 14 162 8.3 0.16 1.2 1.6 0.20 C

14 16 41 16.6 19-19.2 15tS-l~.5 11.0 17 101 2.3 0.07 0.7 0.6 0.13 8 14 17 18 30.7 19-22.3 155-23.1 R.S 1.8 8 174 3.9 0.23 1.3 2.6 0.10 C 14 18 3 13.4 19-19.4 155-16.6 9.9 2.0 7 220 1.9 0.22 1.0 1.5 0.04 R 15 1 48 46.1 lQ-20.3 155-16.2 9.6 1.7 8 ?O2 2.1 0.14 0.7 1.1 0.04 R 15 6 59 28.5 19-24.2 155-23.9 H.O· 2.0 10 195 7.5 0.10 0.7 0.08 C

15 15 27 27.2 19-22.1 15S-12.~ 3.1 8 155 0.9 0.13 0.7 1.4 0.07 R 15 15 4A 21.6 19-18.7 1~5-20.0 ~.l 1.3 11 173 2.7 0.10 0.7 0.5 0.09 B 15 11 B q.A 19-19.4 155-10.9 4.7 1.5 17 173 5.3 0.15 1.0 0.9 0.21 C 15 17 23 15.3 19- 9.5 1!j~-3b.4? 0.0 2.8 1& 107 15.1 6.70 1.2 12.6 0.25 C 15 18 42 5A.9 19-20.4t- 155- 7.41 A.O* 1.5 15 161 5.3 0.17 1.7 0.21 C

16 1 ~3 40.7 19-20.3 1~5·11.0 9.6 1.6 10 220 3.8 0.29 1.5 2.7 0.09 C 16 10 29 40.9 19-24.4 155-23.7 8.0· 1.2 12 118 7.8 0.06 0.5 0.08 B 17 5 9 41.·3 19-19.9 I5!)- d.3 4.0 1.A 19 169 4.8 0.17 1.2 1.1 0.25 C 17 -6 25 10.4 IB-52.A 155- 9.0 48.7 2.1 15 298 4~.4 0.26 2.7 2.9 0.10 0 17 9 28 34.0 19-~O.A 155- 7.3 7.1 3.1 21 131 4.9 0.09 0.8 0.6 0.15 B

17 9 29 33.9 19-20.2 155- 7.9 Z.6 3.7 19 142 8.8 0.18 1.1 1.2 0.27 C 17 9 31 40.9 19-20.3 155- 7.6 8.0· 1.8 12 163 5.1 0.10 0.9 0.13 C 17 11 54 1~.O 19-21.1 155"25.4 6.7 1.1 11 125 4.1 0.14 1.2 1.6 0.19 R 11 12 S6 0.6 19-2('.1) 155-?5.1? 6.4 2.4 20 52 5.4 0.09 0.9 1.9 0.20 B

17 14 29 53.5 19-19.9 155-11.8? 6.4 16 163 4-.9 0.14 1.3 2.0 0.20 C

13
SUMMARY OF SEISMIC EVENTS (CONTINUED)

1912 H~ MN SEC LAT N LONG W DEPTH MAG NO GAP· OMIN ERT ERH ERZ MO Q

NOV 17 16 13 49.4 19-24.1 1:;5-17.4 12.8 13 66 1.4 0.05 0.5 0.4 0.07 A

17 18 21 13.5 19-13.9 155-11.3 12.7 1.6 18 4!) ] .2 0.04 0.5 0.4 0.08 A

17 18 S4 2.6 19-17.0 155- 4.0 31.2 15 265 13.8 0.37 1. q 2.9 0.08 C

17 19 51 lQ.9 19-23.9 15~-17.4 12.9 16 45 1.4 0.05 0.6 0.4 0.09 A

17 20 18 50.1 19-23.9 1~5-17.9 13.6 13 108 1.9 0.06 0.6 0.1 0 •. 06 fA

17 20 31 27.9 19-24.7 155-26.6 ·'.6 2.1 17 94 10.1 0,.11 0.8 0.6 0.14 B

11 20 40 9.3 19-24.2 155-}7.6 14.2 12 10'+ 1.7 0.08 0.6 O.A 0.06 A

11 21 8 10.6 19-21.9 15~-17.S 24.4 'J 87 3.0 0.20 0.9 1.9 0.05 A

17 23 16 2fl.2 19-20.0 155-16.2 6.1 12 180 2.1 0.16 i.l 0.1 0.13 C

11 23 29 59.4 19-23.2 155-11.5 12.<J 2.2 22 60 1.0 0.05 0.6 0.4 0.13 B

17 23 34 4A.8 19-23.5 155-17.4 12.5 2.0 19 53 0.8 0.05 0.1 0.5 0.11 B

18 0 23 34.5 lQ-41.5 155-39.1 23.6 2.7 23 104 34.2 O.IA .1.0 3.6 0.12 8

18 0 56 41. '7 1~-20.6 155-19.5 3.2 1.4 11 102 3.8 0.13 0.4 2.8 0.07 B

18 1 25 SA.7 19-23.9 155-17.3 12.9 1.5 16 45 1.2 0.04 O.S 0.4 0.08 A

18 3 24 4.7 19-23.4- 155-11.2 12.6 2.? 21 S5 0.5 0.05 0.6 O.S 0.11 B

18 5 0 2q.5 19-37.0 1'56-10.0 41.9 17 ?f)5 49.7 0.69 3.2 6.2 0.11 0

18 5 S3 ]4.~ 19-11.2 15e:,-36.11 7.8 3.3 24 95 7.1 0.14 0.9 0.9 0'.19 B

18 6 24 5-' .6 19-24.0 155-11.8 13.3 14- 58 1.9 0.05 '0.5 0.6 0.06 A

18 4 53.3 19-31.2 1~5-'+4. 3 4.'l 10 174 21.4 0.18 1.2 2.4 0.06 C

18 9 21 5.2 19-?4.0 155-11.4 1~.9 13 45 1.4 0.04 0.5 0.4 0.07 A

18 10 ~19 4Q.8 19-22.5 15~-25.1 8.0 1.8 22 52 5.3 0.14 0.7 1.0 0.19 R

18 10 ~8 '-'C;.9 19-2.3.8 lS~-11.~i 12.7 1.$i 17 49 1.0 0.04 0.5 /0.4 O.Oq A

1ft 10 58 41.'4 19-1Q.l ISS-11.R 3.7 2.7 24 153 6.4- O.lb 0.9 1.1 0.21 C

1M 11 8 11..8 19-20.1 155-11.9 7.2 12 206 4.5 0.24 1.1 0.9 0.18 C

18 11 29 40.5 19-2R.l 1S5-51.~? 1.2 2.7 13 227 22.4 1.36 2.4 9.5 0.18 0

18 13 4S 35.6 19- 5.9 154-48.41 24.5* 10 324 36.2 1.94 15.0 0.36 0

18 14 5 2,.1 19-23.1 15~-16.9 13.2 1.5 15 65 0.& 0.04 O.~ 0.4 0.09 B

18 14 15 4~.ti 19-10.6 155"13.7 C;.6 1.5 11 147 S.1 0.12 0.9 0.8 0.22 C

1Cl 1 9 48.7 19-?O.tt 1~S-?4.A? ft.8 ln Q4 2.7 0.09 1.0 1.5 0.19 B

19 2 10 Sl.5 1':i-2Q.7 15b-?1. :i 8.0* 15 281 66.3 0.72 4.1 0.15 0

lQ 2 :.in J4.3 19-15.4 1!;)5-?1.:' 29.1 13 279 b.b 0.55 2.1 4.4 0.11 0

19 3 29 lR.l 19-20.3 15~-12.4 5.1 14 146 12.H 0.24 1.4 1.4 0.24 C

19 6 51 2?9 19-27.1 15~-?9.J 4.1 1.9 1~ 16 11.6 0.12 0.9 1.5 0.21 C lq 1 47 37.4 19-10.6 15C\-~ I.A 3.1 3.0 23 127 11 • .3. 0.15 1. 1 1. 1 0.22 C

19 11 1 ~4.6 19-21.4 1~S-11.7 2?O 1.5 11 81 2.5 0.21 1.3 2.1 0.12 8

19 11 36 41.5 19-20.9 155-13.5 7.2 1.3 15 168 5.0 0.14 1.0 0.6 0.11 C

19 )2 9 17.1 19-1~.!'; 155-13.0 H.1 1.8 17 117 8.3 0.12 0.8 0.6 0.13 C

19 12 24 57.8 19-1k.l 15~-12.q A.O· 2.0 9 233 A.h 0.30 1.9 0.14 0

1&:1 15 55 30.0 19-19.4 1'i5-13.3 1'4.0* 2.0 1 205 7.2 0.19 1.4 0.12 C

19 16 59 ~7 .4 1\)'-18.5 1~5-13.() R.O" 1.3 10 2~4 8.2 0.32 2.2 0.20 C

19 11 3Q 5'3.~ 19-15.1 155- 2.2 33.1 3.b 23 252 22.8 0.26 1.6 1.7 0.10 C

19 18 5 ~.l 1~-53.1 155-40.41 q.l 3.0 25 140 25.2 0.32 0.9 2.4 0.14 C 1~ 1~ 10 11.6 19-19.3 155-11).1 9.7 1.4 9 224 2.tt 0.22 1.1 1.5 0.05 C

19 19 44 24.8 1·9-22.3 155-13.4 3.6 8 145 1.2 0.10 0.4 1-.0 0.06 B

19 20 2'1 3~.O 19-23.6 155-17.& 16.4 11 62 1.3 0.12 0.8 1.4 0.01 A

14
SU~MAH'1 OF SEISMIC EVENTS (CONTINUED)

1972 HH MN SE::C LAT N LONG W DEPTH MAG NO GAP DMIN ERT ERH ERZ MO Q

NOV. 19 23 9 48.3 19-22·.8 155-i?2.1 5.9 7 148 ~.5 0.24 0.6 2.1 0.07 B 19 23 53 43.3 19-22.0 155-12.9 3.8 8 159 1.0 0.18 O.A 1.8 0.09 C 20 2 4 4q.2 19-19.4 155- A.9 A.O" 1.5 12 171 5.3 0.14 1.1 0.14 C 20 3 23 33.6 19-74.4 155-17.4 7.5 9 72 1.2 0.13 0.9 o.a 0.10 A ·~O J 51 0.4 19-20.7 155- 9.7 8.0 0.6 b 155 2.5 0.12 1.3 0.8 0.10 C

20 8 33 24.4 19-15.1 155- 1.7 31.).1 2.5 21 216 9.1 0.27 1.5 2.1 0.11 C 20 9 4 51. y 19-25.7 15S-22·.A 7.(, 3.1 20 6H 5.1 0.07 0.7 0.5 0.16 B 2u 16 H 37.R 19-23.1 155-~6.0 1.6 14 138 1.2. 0.59 o.e 2.2 0.21 C 21 11 43 R.3 19-t»4.7 15'S"';24.M 8.0 0 l.ft 9 213 8.7 0.12 o.e 0.01 c 21 l~ 1 30.1 19-20.7 155-16.4 1.1.~ 1.6 21 123 2.1 0.14 0.8 1.3 0.10 A

22 6 5? 4Q.l 19-20.1 155-14.1 31.6 1.5 22 138 5.3 0.14 0.9 1.3 0.12 R 22 13 2e;.6 19-21.6 1~~-25.6 3.9 1.2 17 6~ 4.8 0.10 0.8 1.2 0.23 B 22 13 51 44.8 19-1q.9 15~-11.R 7.A 0.8 13 214 ~.o 0.13 0.9 0.4 0.09 C 22 16 43 15.4 19-~O.1 155-13.8 "'.0" 14 170 4.8 0.12 0.9 0.15 C 22 1-1 33 4b.O 19-~O.5 155-13.4 5.9 1.2 19 l~O 3.8 0.11 O.A 0.7 0.21 C

22 21 57 lQ.9 19-21.1 155- 5.11 0.0 2.0 19 1~9 5.9 2.35 0.9 4.6 0.16 C 23 0 16 4?8 19-20.1 155-11.7 ~.A 1.6 22 144 4.6 0.11 ·0.8 0.6 0.21 C 23 4- ft 36.4 19-1Q.3 155-13.2 ri.O o 0.9 13 16A 7.3 0.01 0.6 0.10 C 23 4 M 14.9 l'J-IA.O 155-14.0 ~.O" 0.3 11 2'25 7.1 0.23 1.4 0.13 C 23 b 15 17.7 lQ-cO.7 1~5-11.1 5.5 1.2 21 153 3.1 0.12 1.0 0.8 0.25 C

23 d 27 59.3 19-1'1.2 155- 2.61 9.5 16 l<Jb b.2 0.25 2.0 1.3 0.19 C 23 17 14 21.0 1Y-19.A 155-12.6 3. '7 1.5 20 163 4.9 0.16 1.0 1.2 0.26 C 23 18 36 45.2 ·19-19.0 155-20.5 5.4 1.0 11 173 3.8 0.12 O.A 0.6 0.11 C 23 21 44 Q.l 19-1~.5 155-13.fl R.O" 0.5 10 219 7.3 0.23 1.(, 0.16 C 23 23 ]3 14.f.! 19-20.4 1~5-24.2 -8.2 1 • 1 11· Q8 1.7 0.08 o.~ 0.8 0.14 8

24 5 8 2~.2 19-1q.5 lS5-12.Q 8.0* 0.3 13 205 7.2 0.23 1.~ 0.19' C 24 13 11 17.3 lY-lO.l 1~5-10.4 ~.9 11 ?23 3.8 0.13 0.9 1.2 0.01 R 24 14 4A 5S.~ lq-~A.5 1~5-S~.4? A.7 0.9 10 232 23.1 0.26 1,.Q 1.9 0.12 C 24 15 1 54.';i 19-11.8 155-12.7 H.O" 0.3 11 ?3f.i 9.2 0.26 1.6 0.12 0 24 17 2lJ 55.8 lY-14.9 1~5- u.q 35.t' 1.2 19 ~20 ~.8 O.2ft 1.6 2.3 0.11 C

25 0 27 47.7 19-20.3 155-12.7 9.0 0.8 12 191 4.0 0.25 1.2 2.4 0.11 C 2S 0 51 35.3 19-23.3 155-11.3 12.6 1.0 20 S6 0.7' 0,05 0.7 0.'5 0.14 B 25 2 9 C;.7 19-23.6 155-16.3 12.~ 1.2 21 55 1.1 0.05 0.7 0.5 0.13 R 2S 4 lA A.3 19-23.1 155-17.1 15.2 2.1 26 64 0.6 0.07 0.6 0.9 0.13 B 2.!:) 4 32 24.4 1~-2r.9 155-11.0 14.0 O.b 15 71 0.9 0.08 O.B 1.1 0.12 B

25 9 25 12.4 ' 19-19.7 15~-12.8 8.0" 0.4 12 202 5.1 0.14 1.0 0.13 C 25 11 25 14.2 19-22.q 15~-?3.0 7.1 2.2 20 60 4.H 0.07 0.7 0.7 0.18 8 25 17 0 A.6 19-22.~ 1!)5-2~.4 7.9 1 • 1 16 10d 4.7 u.U5 0.5 1.1 0.09 B 25 17 15 42.2 19-1Q.2 155-15.6 8.7 0.1 14 185 3.b '0.15 ·0.9 1.5 0.10 C 26 1 S~ 5Q.4 19-24.1 155-11.2 13.0 0.6 12 ~7 1.4- 0.05 0.5 0.4 0.05 A

26 14 4.1 19-1q.8 1515-12.6 4.3 1.5 23 145 4.8 ).12 0.8 1.0 0.25 C 26 7 21 31.1 19-1c).4 155-11.6 B.O* 0.2 13 1'71 5.8 0.08 0.6 0.09 C 26 ., 29 24.4- lQ-19.6 lc;S-11.9 A.O* 0.2 10 218 5.A 0.20 1.3 0.11 C 26 9 24 50.5 19-17.7 155-21.7 8.0" 0.7 7 243 5.4 0.61 3.8 0.18 0 26 13 4 41.4 19-19.2 155-11.7 B.7 0.6 12 241 6.2 0.23 1.4 2.0 0.10 C

15
SU~MA~Y OF SEISMIC EVENTS (CONTyNUED)

1972 ~R MN SEC LAT N LONG W OfPTH t--AG NO GAP OMIN ERT ERH ERl MD Q

NOV 26 17 16 16.7 19-2~.O 155-?2.4 7.1 1.2 18 63 4.2 0.05 0.') 0.3 0.12 8

~6 It) 57 5<).9 19-11.3 155-23.3 3.7 (J.6 10 172 5.3 0.12 .0.8 1.3 0.11 C

t!b 19 32 ~.1 19-59.6 1~5-25.4 11.3 1.1 11 212 14.3 0.16 1.4 1.1 0.11 C

26 22 25 5.5 lq-~3.q 155-17.2 12.5 0.4 15 ~l l.A 0.04 0.5 0'.4 0.08 A

2-' 0 51 7.7 1~-~4.8 155-2';.';? 0.0 1.5 14 139 'J.2 8.11 0.9 15.5 0.19 C

27 1 10 55.8 19-21.7 lS5-2~.Q1 7.5 0.9 1S 15 11.2 0.09 0.7 0.1 0.14 B

21 19 46.7 19-22.2 155- 3.91 4.4 1.7 16 157 4.5 0.14 0.9 0.8 0.17 C

21 14 35 ~.3 1~-20.2 15S-12.h t\. 1 1.5 18 157 4.2 0.12 O.q 0.7 0.22 C

28 2 5 ::SQ.4 1Y-20.1 1':>5- 8.2 4.8 I.A 19 147 'to.6 0.12 0.9 0.7 0.19 B

211 1 25 3Q.H 19-1Q.3 155- ~.O ~.O* 0.8 5 1'7e ~.4 0.18 1.7 0.10 C

2A ij 2 6.'" 19-19.4 15~-14.0 A.U* 0.6 14 146 5.6 0.17 1.2 0.17 C

28 52 4°.b 19-19.7 1!:i5-11.9 .1 0.2 15 1bb 5.2 0.07 0.5 1.0 a.OR R

2M 19 47 40.6 1~-lq.9 155-11."1 7.1 0.5 10 212 4.9 0.14 0.9 0.5 0.07 B

2A 21 29 25.2 1~-19.3 155- ~.4 8.0· O.~ 10 l·'~ 5.b 0.11 1.4 0.15 C

29 u 51 40.3 lQ-lR.9 1~5-15.5 9." 0.7 13 191 3.'1 0.13 0.7 1.2 0.08 8

29 1 59 35.0 19-19.8 155-17.0 9.5 0.1 9 193 0.9 0.43 2.1 3.2 0.10 C

29 2 49 42.2 19-21.3 155-25.11 6.7 0.9 12 119 3.6 0.10 1.1 1.8 0.20 B

29 10 21 30.H 1~-23.0 155-?9.2 7.2 2.3 22 62 11.6 0.10 0.5 0.7 0.12 C

29 20 4 16.5 1~-25.5 1~5-S0.1 ~.6 1.5 11 274 25.6 0.26 1.6 1.6 0.12 C

30 14 51 15.8 19-24.3 155-26.0 e.o* 1.0 15 157 8.9 0.17 1.3 0.18 C

30 18 8 2.6 19-24.9 155-?4.8 8.0* 1.0 14 102 8.7 0.08 0.1 0.14 C

OEC 1 3 15 15 •./ 19-31.0 155- 8.1 JO.3" 2.2 9 341 16.0 1.03 13.~ 0.25 0

1 3 10 ~.l 1<J-14.2 155-15.5 6.0 0.8 17 168 3.7 0.12 0.8 0.7 0.17 C

1 5 31 3~.4 lq-24.9 155-27.5 5.2 1.0 17 94 11.4 0.10 0.7 1.0 0.11 C

1 b 53 5.7 19-20.9 15~-13.9 9.0 -0.0 10 1"4 4.5 0.16 0.9 1.8 0.09 B

1 1 41\ 9.4 1~-23.3 155-17.5 12.3 1 .1 19 58 0.9 0.07 0.8 0.6 O.lft B

1 a 25 10.6 lY-23.& 155-~4.41 A.O 2.9 13 20a 14.7 0.23 3.0 2.9 0.15 C

1 8 27 40.1 19-22.4 1~5-59.6 IJ.~o 3.0 11 233 17.5 0.30 2.2 0.14 0

1 12 22 3A.6 lY-21.0 1~S-11.4 5.6 12 201 3.3 0.30 2.3 1.1 0.25 C

1 13 3 24.2 1~-24.3 155-16.6 12.4 1.6 13 73 1.3 0.11 0.5 0.9 0.07 A

1 13 59 lR.2 20- 2.0 15~-35.4 A.1f. 3.1 17 183 22.4 0.20 2.5 3.2 0.20 C

1 14 43 5~.8 19-24.4 155-23.6 5.5 1.6 11 114 6.9 0.16 1.2 1.3 0.19 C

1 19 43 8.1 19-23.6 15S-2J.2 2.6 1.5 18 98 6.1 0.13 0.9 ,J.9 0.23 C

2 1 IH 47.4 1~-2~.5 I~S-24.2 A.O· 12 200 7.9 0.10 0.6 ~\ 0.08 C

2 S I 47.5 1~-24.0 155-16.2 Il.R 2.4 22 56 1.8 0.05 0.6 0.4 0.13 B

2 S 16 32.5 19-23.4 155-?3.4 ~.Oo 9 tA2 6.0 0.07 0.6 0.06 C

2 M 9 20.3 20- 1.2 155-45.41 5.8- 15 156 12.2 0.09 1.0 0.13 C

2 13 19 16.1 19-15.5 15&;-19.2 25.8 2.2 14 160 4.6 0.17 0.9 1.7 0.09 B

2 21 41 10.0 19-24.2 155-~3.A 8.0· 11 192 7.3 0.11 0.7 0.10 C

3 2 53 51.0 19-20.5 1S!i-13.2 ".5 15 150 5.~ 0.1R 1.1 1.3 0.22 C

3 3 30 16.0 19-52.1 155-48." 14.4* 11 178 20.2 0.15 1.5 0.12 C

3 10 59 10.'1 19-1~.4 15~- 9.0 A.O* 0.3 10 176 5.1 0.17 1.4 0.16 C

3 l~ 1f., lO.A 1~-2~.4 155- 0.1 ':J.7 1.5 13 1M3 6.1 O.lA 1.3 1.0 0.18 C

3 12 42 2A.4 19-19.6 1~'5-1~.3 lO.~ 1.9 9 177 3.~ 0.15 0.7 1.4 0.07 B

3 16 1)3 11.6 1'J-2fl.f) 15~-11.8 ft.l 0·.9 18 150 3.4 0.08 0.7 0.4 0.13 R

16
SUMMAHY OF SEISMIC EVENTS (CONTINUED)

1972 HR ~N SEC LAT N LONG W DEPTH MAG NO nAP DMIN ERT ERH ERZ ~o Q

OEe 3 18 30 41.4 19-19.3 155- 9.0 A.Oo 1.A 13 178 5.4 0.09 0.8 0.11 C 3 1& 57 25.2 lQ-lH.5 155-13.0 8.0* 0.6 Q ?24 8.2 0.20 1.4 0.11 C 3 23 2" If,.6 lY-21.0 155-10.5 8.7 1~2 e 214 2.3 0.16 1.2 1.5 0.08 C 4 0 Sb 41.8 lA-53.h 155-2S.h 24.2 1.2 13 303 29.5 1.73 10.2 9.2 0.18 0 4 2 ~9 12.4 19-19.9 155- 6.Q 8.0" 1.4 12 110 6.6 0.01 0.7 0.08 C

4 4 16 59.8 19-24.4 155-17.1 9.2 1.3 6 10J o.q 0.57 2.0 4.5 0.09 B 4 4 18 51.1 19-20.7 lS';-13.4 4.2 0.5 11 172 5.3 0.20 1.0 2.1 0.10 C 4 11 20 4(,.0 19-15.6 1~~-?4.B 213.5 n.7 If) 137 A.') 0.30 1.2 2.9 0.11 A 4 14 22 20.9 l'1-~O.l 155- 5.'1 R.O* 0.9 10 165 5.3 0.20 1.9 0.23 C 4 14 S5 11.4 19-i!O.1 1~5-16.4 32.3 3.2 24 133 1.7 a.lA 1.0 1.7 0.15 B

4 16 5 48.0 19-20.2 15S-12.1? 1.8 0.2 10 201 4.3 O.IA 1.1 0.6 0.11 C 4 17 3B 30.4 1q-19.2 1~5-11.4 5.4- 1.7 12 175 6.4 O.lM 1.4 1.0 0.20 C 4 17 42 13.4 19-2n.5 lS~-ll.n t'.o 1.6 18 140 3.9 0.11 0.9 0.7 0.21 C 4 19 7 0.8 19-19.h 1~5-1~.3 10.1 0.9 11 229 5.3 0.39 1.A 2.9 0.10 C 5 J 3~ ::i~.l 19-1Q.6 1~~-11.5 1-'.0* 0.3 11 ??l 5.4 0.13 0.9 0.10 C

5 l~ 16 52.4 19-1~.5 155-)3.4 P.O· 7 2?1 ., .6 0.20 1.5 0.12 C 5 21 7 11 .0 19-11.1 155- M.l' t".O· 0.9 11 211 8.2 0.31 2.4 0.25 C 6 H 1 54.5 19-20.A 155-12.4 6.0 1. A 18 1b1 3.1 0.14 1 .1 Q.R 0.?5 C 6 13 4 4R.6 19-24.A 155-23.S 13.0" 1 • 1 12 172 6.9 0.09 0.1 ~:, 0.11 C b 21 10 41.9 19-10.9 155-32.6 4.3 2.2 13 103 8. -." 0.13 1.0 1.1 0.22 C

6 21 11 50.6 19-17.0 155- 1 • 1 2Q.3 0.9 10 222 24.9 0.49 2.6 4.1 0.11 C 7 2 1 ??.7 19-31.8 1~6- 3.q 5~.1 1.7 1 239 35.5 1.78 5.8 17.3 0.05 0 7 10 2S 2!;.5 19-2f).0 15'5-27.1? R.O 3.0 22 45 Y. "f 0.09 0.5 0.7 0.14 8 1 11 59 4?4 1~-26.3 155-';1.91 5.6 1.5 11 257 19.0 O.3~ 2.S 3.0 0.12 D 7 17 12 55.0 19-17.6 15~-lS.4 10.2 0.8 9 226 5.f\ 0.39 2.1 3.2 0.11 ·C

1 lU cs 51.1 19-51.6 15«;-?8.~ R.9 0.7 9 ~70 14.4 2.36 24.2 19.8 0.11 (\ 1 ?~~ 1'1 2C;.5 19-1A.~ 15S-12.Q 3.q 1.2 20 11~ 1.2- 0.21 1.2 1.3 0.26 C 1 23 41 17.0 19-19.6 155-13.0 H.O'" 0.3 13 184 7.2- 0.18 1.4 0.21 C 8 2 47 7.4 19-20.3 1~5- H.1 4.0 2.4 22 145 4.4 0.16 1 • 1 1.0 0.26 C b 4 34 53.1 l~~lO.k 155-3~.3 7.4 3.0 21 41 7.1 0.1b 1.0 1.0 O.l2 C

8

8

5

7

8 47.0 19-20.9 155-13.6 lq. o. 0.1 8 166 6.8 0.13 1.0 0.13 C

A

S 28.9 14-20.7 lSS-12.1 6.3 2.5 21 138 3 .... 0.10 0.8 0.6 0.19 8

8 "I

7

2A

22 51) .1 19-21.0 155- 4.51 ,.6 1.3 10 130 ..3.4 0.28 2.4 2.0 0.32 C 31.6 19-24.1 1~5-?4.8 H.O* 0.9 1" 78 7.6 0.11 0.9 0.21 8 8 11 21 31;.1 19-20.] 155-10.8? ~.2 0.4 10 ?24 j.6 0.62 3.8 2.2 0.18 C

8 11 48 15.3 19-19.3 1~5- 9.e 7.9 10 233 5.1 0.39 2.6 1.4 0.17 0

9

8 19

6

5S 10.5 19-19.7 155-15.3 H.O 14 163 3.8 0.09 0.1 0.4 0.13 C 11 4".5 1~-19.3 15~-14.5 R.O· 0.7 11 lA7 5.3 0.13 0.9 0.13 C

9

9

10

30 1~.8 19-13.4 l~~- 0.51 34.1 1.3 .14 249 22.9 0.34 1.8 2.4 0.09 C 7 2.2 19-1A.6 155- t,.2 8.00 11 256 9.1 0.59 3.r; 0.21 0

10

Q 17 38 44.5 19-19.4 1b5-1S.5 6.~ 1.5 19 166 3.5 0.11 O.B 0.(, 0.18 C

10

0 44 40.9 19-44.2 1~S-24.C; -28.4 1.3 19 95 7.2 0.16 0.8 1.8 0.09 A

10 3

0 58 6.6 19-10.A 1~5-3".Q f,.O 2.3 13 ~6 7.6 0.19 1.2 1.3 0.23 C

10

59 45.J 1'1-22.5 155-25.4- 8.00 1.2 13 139 '5.6 0.01 o.~ 0.11 C 10 41:, 5~.1 19-2U.8 1~5-?6.1 6.1 1.0 IS 16 4.9 0.10 0.9 1.0 0.21 R

17
SU~MARl' OF SEISMIC EVENTS (CONTINUED)

1912 Hk ~N SEC LAT N LONG W DEPTH ~AG NO GAP DMIN ERT ERH ERZ MO Q

DEC 10 14 S~ 47.3 19-31.0 155-C;J.2 A.O* 0.9 5 344 52.4 0.40 S.O 0.05 0

10 15 48 29.H 19-19.~ 155-11.8 H.l 0.1 8 220 5.6 0.16 1.2 0.6 O.O~ C

10 16 6 19.3 19-1A.4 1!J5-15.2 Q.3 0.3 9 207 4.9 0.27 1.4 ,2.'+ 0.10 C

10 1A 56 26.8 lY-19.9 15~-16.5 A.) 0.4 10 1'78 1.1 0.11 0.8 1.1 0.01 8

10 19 51 1f,. 0 19-19.9 155- 9.1 10.1 0.1 11 1q7 4.0 0.22 2.1, 2.1 0.11 C

10 20 2 7.9 19-20.1 155-14.1 2A.3 0.8 11 1~6 4.A 0.24 1.3 2.1 0.08 C

10 ~l S5 56.\i 19-14.7 1~5-?".'5 J.9 1.5 17 74 10.1 0.10 0.7 1. 1 0.11 C

10 22 53 2".2 1~-19." 155-10.4 A.B 0.9 9 164 2.0 0.20 1.3 2.1 0.10 C

10 23 54 4~.5 19-35.4 155- 9.4 A.Oo 10 241 13.8 O.2~ 1.7 0.11 0

11 2 29 36.6 1~-4().9 154-58.4 49.1 1.9 23 211 21.1 0.36 1.6 3.0 0.12 C

11 :t 3~ 13.0 19-22.A 155-?f!.Q ~.O* 0.2 8 169 4.9 0.08 0.7 0.09 C

11 ]:~ 17.4 1~-24.1 155-?'j.8? O.U 13 14~ ~.4 7.QS 0.9 15.1 0.18 C

11 )j 3~ o.~ 19-11,.3 1~5-?9.0 4.9 9 126 12.3 0.11 1. 1 1.3 0.16 C

11 11 54 4q.6 19-2c.Q 1~5-?ti.e 0.4* 14 127 7.H 0.14 0.9 0.23 C

11 15 ]fo, 1~.9 19-14.1 155- 3.f./ 0.0 11 ?O2 12.2 8.32 1.9 15.4 0.17 C

11 15 43 3Q.~ 19-22.1 155-1°1.1 22.2 12 83 3.2 0.22 1.0 2.1 0.08 B

11 21 51 47.1 19-20.1 is!)- 8.2? 1.8 9 166 4.6 0.15 1.S 1.0 0.11 C

12 6 c; 40.4 19-37.3 155-11.9 14.4* 2.0 23 113 19.2 0.10 O.A 0.14 C

12 13 3H 53.0 1~-2b.4 1~5-23.9 6.Q 1.3 20 66 5.9 0.08 0.1 0.6 0.18 B

13 5 3 49.Y 19-21.3 15~-1f:).4 26.5 1.4 19 142 2.2 0.13 o.e 1.3 0.11 B

13 14 37 A.6 19-1A.5 155-20.8 6.8 1.7 16 113 4.0 0.10 0.9 0.7 0.17 B

13 16 10 5.3 19-1Q.l 15~-13.6 A.O* 9 207 7.0 0.15 1.0 0.11 C

13 16 56 1-;.3 19- 1.2 1~5-20.3 3l.3 14 237 20.2 0.49 2.5 4.2 0.10 C

13 16 51 39.6 19- q.~ 155-?~.7 31.2 12 193 20.2 0.38 2.0 4.3 0.10 C

13 16 59 34.~ 1'l-24.1 1~5-16.3 12.9 1.b 9 144 1.3 0.16 O.b 1.3 0.04 B

13 ~2 7 54.5 1~-14.6 155-28.01 ft.4 12 123 4.0 0.09 1.0 0.8 0.14 R

13 22 18 19.0 19-14.ft 155-30.41 8.9 l.I 14 Ql 1.2 0.10 1.0 0.9 0.19 R

13 i?3 3 21.6 lQ-20.2 155- 8.7 7.7 2.2 ~l 1f,4 4.0 0.12 1.0 0.7 0.17 C

13 23 21 29.6 19-2?6 155-28.1 4.1 1.8 14 58 Y.S 0.16 O.A 1.3 0.21 C

14 1 34 3.4 lQ-lO.1 155-34.01 5.3 2.3 14 104 9.5 0.15 1.2 1.3 0.25 C

14 3 6 51.3 19-20.1 155-]2.4 f) .9 i'.O 22 168 3.3 0.12 0.9 0.5 0.18 C

14 12 )~ 53.0 lQ-1S.3 15S- 'J.~ 31.4 9 ~48 16.0 0.50 2.6 3.9 0.01 0

14 21 48 54.8 19-20.2 155- 7.A A.O 16 20U 4.9 0.25 1.7 1.0 0.16 C

14 23 42 3.5 lQ-~3.3 15';-11.4 4~.4 14 106 3.6 0.40 1.7 ~.6 0.09 R

15 6 17 2Q.~ 19-20.6 1SS-l0.6 27.1i 11 68 4. -, 0.24 1.3 2.5 0.10 B

15 1~ 3 A.4 19-23.0 l55-25.7 7.'" 2.1 20 76 6.7 0.11 0.6 0.7 0.15 A

15 11 2l 12.5 19-20.1 155-1 '~. 7 30.9 1~ 139 5.7 0.37 1.9 3.A 0.1(, C

15 23 3n 5:~.9 19-52.4 155- H.3? 49.7 2.8 23 216 21.5 0.35 1.5 3.2 0.11 C

16 0 5 2.8 19-22.4 155-,3.91 A.S 13 160 4.2 0.18 1.2 2.9 0.14 C

16 4 28 41.0 19-12.1 155- 4.A? 0.0" 11 ?76 20.5 0.78 4.4 0.30 0

16 A 4'; 20.2 19-20.5 lS5-l4.7 ~.2 14 1H3 4.0 0.11 1.0 0.9 0.15 C

16 l~ 14 JA.6 2()- ~l • " 1 ~6-:~7.5 4.-' ::t.O ~2 ?4B 81.0 0.35 2.~ 3.0 0.17 0

11 2 7 20.d 19-21.1 1~5- ?1? 1.4 13 213 13.7 1.Q7 1.7 6.9 0.16 C

17 7 4A 40.1 19-23.0 155-23.2 A.4 1.A 17 53 5.1 0.05 0.5 1 • 1 0.12 A

17 1 S~ A.3 19- 0.8 155-29.1 14.1 0 15 230 19.2 0.30 2.5 0.20 0

18
SUMMARY OF SEIS~lC EVfN1S (CONTINUED)

1972 H~ MN SEC LAT N LONG W DfPTH MAG NO GAP DMI.N ERT ERH ERZ MO Q

OfC 17 12 SA 8.4 19-20.3 155-11.0? f.4.3 ·1.9 11 217 3.8 0.14 0.9 0.5 0.10 C 11 13 51 lQ.7 1~-19.2 155-47.1 4.7 1.0 10 169 10.9 0.15 1.5 1.5 0.10 C 11 16 ? 30.1 19-11.0 1~5- 7.0? 0.0 1.6 19 219 10.b 5.47 1.6 10.1 0.24 C 17 18 1~ S{).O 19-15.4 1~5-?o.7 7.6 2.8 18 150 I.R 0.15 1 • 1 0.8 0.23 C 17 2J. 0 5~.~ 19-20.3 155-12.1 11.2 1.2 9 217 5.1 0.41 2.2 3.0 0.11 C

18 3 10 59.2 19-20.5 155-17.3 7.0 0.5 11 1?7 0.7 0.21 1.4 1.0 0.18 B 18 3 35 ~.9 19-19.0 155-13.4 7.8 0.5 15 213 6.6 0.14 0.9 0.4 0.11 C 18 5 34 2&;.9 19-25.4 155-24.11 7.3 1.2 18 62 7.2 0.05 0.6 1.8 0.13 B

1M 10 14 30.1 19-20.5 155-13.2 S.1 13 lAO 3.1 0.20 1.2 1. 1 0.19 C lR 10 IS 31.4 19-47.4 155-23.4 27.9 3.0 21 109 12.1 0.24 1.3 3.6 0.16 ij

18 16 46 43.2 lQ-19.b 155-13.3 8.0* 9 199 6.8 0.12 0.9 0.11 C 18 19 43 48.8 1~-20.3 1~5-11.0 ~.3 11 159 3.9 O.OQ 0.7 1.4 0.08 B 18 l3 53 57.4 19- 6.1 155-25.5 40.A 13 201 7.~ 0.46 2.2 4.6 0.12 C 19 3 23 3A.2 19-23.6 155- 3.31 2.A 10 114 6.9 0.20 1.4 2.4 0.26 C 19 J 2A 27.'+ 1~-20.7 15~-12.3 8.0 0 11 lR5 4.Y 0.10 0.7 0.07 C

19 3 29 13.7 19-~O.& 155-41.8'" 3 .1 2.9 17 109 lO.~ 0.12 0.8 1.0 0.11 C

19 3 34 3.3 19-20.6 155-24.61 A.1 13 130 2.3 o. 11 1.1 1.1 0.18 B 19 4 32 q.~ 19-20.5 15~-19.H 1.1 1.3 10 109 4.3 0.11 O.S \0.7 O.OS A

19 15 6 51.9 19-?3.~ 15S-?3.4 f4.0* 10 )'A 1 6.1 0.12 0.9 .\, 0.13 C 19 20 5 43.9 19-21.9 lSS- 6.0 3.1 0.8 9 12" 6.5 0.17 1.4 1.9 0.22 C

19 20 '57 24.9 1(j-33.4 155-'54.9 9.2 1.3 12 251 34.0 0.34 2.5 2.5 0.15 0 lq 22 l~ ~~.7 19-1q.4 15~-12.~ A.UO 1.h 10 20H 7.1 0.19 1.3 0.14 C

20 0 l~ 1.7 19-2 1• • t. !~5-17.Q 'f. H 1.3 1 III 2.0 0.31 0.7 2.2 0.05 R

20 0 23 52.3 19-23.3 15~-1".~ 13.1 1.5 20 51 0.2 0.05 0.7 O.~ 0.12 B

20 0 30 44.7 19-23.4 155-11.0 11.8 0.8 1~ 6M 0.1 0.10 1.0 1.0 0.15 B

20 0 43 24.3 1~-24.t' 15~-11.2 4.3 1.2 5 106 2.3 0.09 0 20 0 ~H 37.3 19-?O.~ 1~5-1~.q O.H 0.1 e lU9 4.4 0.08 0.3 0.4 O.Of. A ?u 8 ? 2.3.0 19-21.1 1!)~-12.~ 4.9 0.1 11 131 o.a 0.10 0.5 1.1 0.10 20 8 3A ~.6 1Y-21.9 1~~-25.6 4.1 0.1'4 14- 70 ').2 0.12 1.0 1.6 0.26 C 20 9 J4 4Q.5 lq-1H.B 155-16.3 ~O.4 2.4 22 143 3.0 0.12 O.A 1.2 0.12 B

20 13 42 5".0 19-20.2 155-12.3 A.1 5 281 7.6 0.03 0 20 17 32 59.2 19- 9.6 155-41.2 1.7 3.2 21 128 12.1 1.32 1.0 4.7 0.23 C 20 21 31 22.2 19-5A.5 155-46.51 0.0 2.1 15 ?O9 17.0 0.49 1.2 O.R 0.12 C

21 0 21 11.8 19-21.9 155-13.1 4.6 159 1.3 0.22 0.9 2.1 O.I~ C ~1 15 16 3".5 If:l-23.9 155-29.0 6.3 1.4 16 86 12.1 0.06 0.5 0.5 0.12 R

21 16 11 49.3 19-23.7 155-28.9 5.5 I.A 14 88 11 • -, 0.11 0.9 1.2 0.20 C 21 19 29 13.7 19-22.2 15~-13.1 4.6 0.4- 10 150 o.~ 0.11 0.6 1.1 0.09 B 21 21 16 49.b 20- -'.4 l5S-'i2.0 33.8 3.0 28 26-' 9.1 0.37 2.0 3.1 0.14 C

21 22 42 2.4 1<j-2~.4 lSS-r,6.5 1.2 3.1 23 211 24.0 0.38 1.3 1.5 0.15 C 22 11 311 2.8 19-23.9 155-23.4 4.6 1.3 12 171 6.9 0.13 0.9 1.3 0.14 C

22 17 53 4?b 1~-19.2 155-13.5 q.o* 0.9 13 193 7.1 0.12 0.9 0.12 C

22 21 55 1 .8 lq~1~.1 155-12.1 1.A 1.3 19 165 5.2 1.48 1.0 5.4 0.25 C

22 2~ 17 2?1 19-23.5 15S-?2.31 2.5 1.0 12 154 4.5 0.28 0.6 0.9 0.12 C

23 2 9 23.b 1~-19.1 155-13.8 8.0* 0.£1 12 ?04 6.6 0.16 1.1 0.15 C

23 2 45 29.9 19-21.7 15~-15.1 10.6 1. 1 b 206 1.9 0.22 0.9 1.6 0.05 B

19
SUM~AHY OF SEISMIC E""ENTS (CONTINUED)

1912 HH ~N C;EC LAT N LON(~ W D£PTH MAG NO GAP OMIN ERT ERH ERZ MO Q

DEC 23 13 21.2 19-19.2 155-18.2 3J.O 0.7 16 113 2.2 0.21 1.1 1.9 0.11 B

23 C-J 4 51.1 19-34.0 155-59.1 44.9 5.2 27 IRA 20.3 0.19 ,1.0 2.3 0.13 C

23 'l 11 59.8 19-34.2 155-~8.5 51.2 3.1 21 24b 19.4 0.42 1.7 ,3.3 0.08 C

23 16 11 ~.8 1'J-t!1.~ 155-?9.h 4.0 O.q 17 '60 10.1'\ 0.09 0.7 ~.O 0.19 C

23 16 31 2.e 19-19.6 15~-IJ.8 7.5 1.3 ~l 144 5.5 0.08 0.6 0.4 0.13 B

23 16 32 3?7 lY-IA.8 155-13.4 ~.O* 0.8 14 214 6.9 0.15 0.9 0.10 C

23 lH ~4 h.5 1Y-19.1 155-13.5 ~.O* 1.0 11 2"M 6.11- 0.12 o.a 0.10 C

23 20 29 7.b 19-1~.A 155-13.6 A.1 1.3 17 175 6.9 0.11 0.8 0.5 0.11 C

23 20 52 42.1 19-18.6 155-13.4 H.O* 0.1 e 21~ 1.6 0.17 1.2 0.11 C

23 22 10 2Q.t3 19-20.?,l:>S-11.9 11.4 1.4 11 20!) 4.4 0.21 1 .1 2.3 0.08 C

24 0 17 20.4 19-43.1 1~5-46.9 27.4 1.9 9 120 6.8 0.20 1.2 2.5 0.04 B

24 7 15 3q.5 lq-17.7 155-17.q A.O* O.B 13 2:i 7 ~.9 0.?2 1.4 0.11 0

24 8 47 11.4 19-20.6 155-1~.5 3.1 10 101 3.8 0.23 0.6 2.2 0.08 8

24 10 43 .~.l 19-33.4 155-59.~ 47.3 4.8 26 222 21.9 0.30 1.3 2.8 0.11 C

24 22 49 29.3 1~-23.9 lSS-lS.1 4.0 1 • 1 11 131 l.4 0.20 0.7 1.4 0.10 8

2~ 0 40 1.2. '1 19-1 Col. " l~S- 7.9 .1. t! 1.8 21 173 5.5 0.16 1.0 1.0 0.24 C

25 I) 5M 3.5 1~-lq.3 15S-12.Q? 0.0 1.~ 17. lq3 1.4 A.Ol 1.5 15.1 0.29 C

2S 1 30 2j.h 1\j-l to). '7 l'i5-?O.Q 4~.Q 1 .1 9 257 5.1 2.31+- 1.'2 10.2 "0.12 D cS 2 Sq 19.4 J q-4t~.6 15'5-?2.7 32.U 1.5 21 113 (i.e) 0.18 0.9 2.0 0.10 B

25 &;:

J 2& 42.9 19-30.2 1~C)-4".5 f\.9 1.a 18 141 18.S 0.72 0.9 5.2 0.15 C

1'5 3F4 4.4 19-1q.~ 155-13.6 b.4 1.~ 16 1147 6.5 0.16 1.1 0.9 0.19 C

215 6 3 23.3 1q-2~.4 155-23.7 t'." 1.0 l~ 95 4.1 0.08 0.7 0.7 0.18 B

2s 7 1 47 •.:~ }~-lA.~ ]55-15.~"i q.o 0.1 12 192 "3.A O.?2 1.4 2.4 0.16 C

25 1 17 31. Of 19-~4.b 1S~-11.·3 ~.2 ).3 ., 90 0.6 0.28 1.0 2.2 0.06 B 2~ II 31- 3~.H 1'1-23.~ lS5-?~.5 10.7 1.3 13 115 s.a 0.09 0.5 1.3 a.OR A

2'; 22 11 11 .1 19-34.1 l~b- 0.1 47.3 3.5 27 22~ 22.4 (J.31 1.6 3.4 0.12 C

26 2 3 lQ • .3 19-1?2 J ~5-1 ] .4 A.Oo 0.3 12 214 Ib.S 0.36 2.2 0.25 C

?h t!. f\ 51.A }9-26.2 1~5-2".A 7.q 1 • 1 19 6M 9.1 0.10 O.b 0.7 0.13 B

26 3~ l?l 14-24.~ 15~-16.:i lQ.h 16 12 2.8 u. l:i 1.0 1.6 0.14 R

26 ltl 43.f~ 1(J-2~. to' 155-2&.6 ~.o 2.5 22 84 6.1 0.10 0.1 0.8 0.20 C

~" 1~ 13 2P.1 19-30.3 155-50.6 H.~ O.A 12 2?"/ 2b.7 0.35 2.3 2.8 0.20 C

i!6 21 1 3t!.4 1<.1-21.0 1~5-1o.3 31.0 1.7 1~ 121 2.6 0.15 0.9 1.5 0.12 B

27 ts 0 11 .:1 lCo1-t!4+.2 15S-1S.E' J .1 1.0 7 11 ? 2.4 0.10 0.3 \1.1 0.04 P

?7 1n 3(J 3~.S lCl-lA.O !S~-14.2 14.~ 8 2?3 6.R 0.19 1.1 1.7 0.05 C

27 20 lk 23.2 lQ-20.S l':;S-lS.l 10 .... 1.q 10 13~ 3. 'f O.2i! 1.9 2.4 O.lA C

21 20 40 l."i 1~-20.f, l~ti- 11.1 7.3 o.~ 9 1~7 4.1 0.13 1.3 0.8 0.15 C 2~ 1 11 1~.~ 1~-2CJ.4 !~'j-13.1 H.O*-O.O 11 10J b .1 0.11 0.8 0.10 C 2q :3 Sl Q.5 19-24.2 1~S-?4.0 7.4 O.B 11 124 1.5 0.07 o.f, 0.6 0.11 R ~~ 43 40.9 i9-I'!H.9 155-3'~.51 32.2* 1.2 (, 174- 2. '1 ~.2j 1.40 0 2~ 4 ~~ 50.1 1~-21.4 155-1J.3 II.S 8 1"8 S.o 0.26 0.7 2.4 0.05 C

29 1 34 30.~ 1'J-2~.7 l~S- 2.21 2.7 1 .0 a 141 ~.3 O.2~ 2.3 2.8 0.29 C ~~ 14 ';4 24.t 1~-24.3 J~~-l-'~."? o.() 1.1 11 163 a.t' 7.99 1.0 15.1 0.14 C

?y ~j 3,' 3&J.t! 1~-,~ 1 .2 l~~- f.O i".J 1.8 14 lab 5.2 0.16 1.3 1.6 U.20 C

30 j 3:-4 ~4.n l"'-lo.~ 155-1.3."1 6.J 1.5 18 160 6.2 0.13 0.9 0.7 o.l~· C

30 11 4'. 41.] l·~-lA.l 1~S-\2.8 H.l 1.7 \4 ??7 ~.o 0.22 1.4 0.6 0.13 C

20
SUMMA~Y OF StlS~lC F..VEr·04TS (CONTJNlIE'O)

1972 HK ~'~J ~EC tAT N LONe; W DEPTH MAG NO Bf\P DMIN EPT f:RH ERl MO Q

DEC 30 14- 4~ n.t) lY-lf';.A 151;)-1.3.2 1.9 2.-5 22 1~2 b. -, 0.10 0.7 0.5 0.13 C

30 l~ 3/. 52.4 1<.J-IH.6 155-13.3 'i.f.J 12 l~l 7.A 0.21 1.4 1.1 0.19 C

30 lB 42 S}.4 ItJ- q.6 155-2~.~ 47.3 19 131 1.7 0.38 1.6 3.4.0.14 8

~l (, ~7 36.3 1~-21.9 15S-?S.S 2.9 15 IfJb 6.3 0.17 1.0 2.0 0.19 C

31 l+ () 5::1.4 14-24.'5 15S-2h.7 ~.O* l.~ 12 248 ~.~ 0.21 1.2 0.09 0

31 1~ 3-' 5?f, 19-20.1 155- A.~ 4.2 ?2 20 165 4.1 0.14 1.0 1.0 O.lq C

31 ~l !iH 11 .3 19-2S.6 15~-21.6 1j.5 1.4 13 143 4.0 0.10 0.7 0.8 0.15 A

Table 3. Felt earthquakes

I2.~te Tir18 Magnitude Felt report

ti- M S

l,Tov 17 09 29 3J.9 3.7 Kurtistown, Hila

19 07 L}! 37.4 3(10 ·South Kana

19 17 39 53.8 3.6 Hila

19 18 05 02.1 3.0 Kamuela

Dec 1 13 59 18.2 3.1 Kamuela, Ahualoa

4 14 55 11.4 3.. 2 Kapapala

17 18 16 50.0 2.8 Kapapala

21 22 42 02.4 3.1. Kailua'-Kona, Kealakekua,

Kainaliu

23 09 04 51.1 5.2 Kana, Kau, Naalehu, Volcano,

Waimea, Puako, and on the

Island of Maui

23 09 11 59.8 3.1 Kealakekua

24 10 4J 05.1 4.8 Kona and on. the Island of

Oa,llu

25 22 08 11.3 3.5 Kana and on the Island. of

Oa11u

21
+

19 34.0 19 34 .0

<.1\

<.11

a>

+ 0

+

+

••X

~:.~.~ .

+

+

. ....

• +

. "

• • •• a.-+ .1-

" ...:.: .~.:.. :. . - . "··1.- +.• " .•. .....- . ....... :.. ~.:

• I::..,." .;.. .,...... -.

A" X:" _ •• +,

· ." t

"+ ...

C

'

A \ tJ._. : • .,"". ... - " ... Ir. · + ! I

.-+b. " ."+"

.. x

+ +.

"..+

~t ." .• "~•

... . . ..,: +

+ + .. +

". "

+

• +

6

+ Magnitude

Interval

4.0 < M S 5.0

(J'l 3.0 < M S 4.0 <J1

<.11 < M S 3.0 <J1 2.0

w M $ 2.0 0")

0

+ 0

0 0 5 Km +

19 i 0 .0 - - - 19 10 .0

Figure l.--Plot of epicenters 1n the Kilauea region. Triangles are

seismometer locations. Kilauea Caldera and the major pit craters

on the east rift are shown in outline. The Pacific Ocean lies in

the lower right portion of the illustration.

22
Table 4. Seismometer stations in Hawaii operated by the U. S. Geological Survey.

STATION NAME CODE LAT-N LONG-W ELEV TYPE CAL veo RADIO REMARKS

AHUA AHU 19 2'2.40 155 15.90 1070 3 6.0 2380

CONE PEAK CPK 19 23.70 155 19.70 1038 3 1.34

DESERT DES 19 20.20 155 23.30 815 3 1.34

ESCAPE ROAD ESR 19 24.68. 155 14.33 1177 3

HALE POHAKU HPU 19 46.85 155 27.50 3396 1 5.6 1360 RF6

HILINA PALl HLP 19 17.96 155 18.63 707 1 6.0 2040

HUALALAI HUA 19 41.25 155 50.32 2189 1 5.2 1700 RF4

KAAPUNA KAA 19 15.98 155 52.28 524 1 5.5 1020 RF12

KAHUKU KHU 19 14.90 155 37.10 1939 1 5.7 1700 RF3

KAPAPALA RANCH KPR 19 16.40 155 26.70 610 1 6.5 1700 RF1

KEANAKOLU KKU 19 53.39 155 20.58 1863 1 4.8 2380 RF7

KIPUKA NENE KPN 19 20.10 155 17.40 924 3 1.34

KOHALA KOH 20 7.69 155 46.77 1166 1 1.5 2380 RF2

MAUNA LOA MLO,19 29.80 155 23.30 2010 1 6.5 1360

MAUNA LOA X MLX 19 27.60 155 20.70 1475 3 1.34

MAKAOPUHI MPR 19 22.07 155 9.85 881 1 5.7 2720 RF5

MOKUAWEOWE0 MOK 19 29.28 155 35.98 4104 1 6.5 2040 RF3

MOUNTAIN VIEW MTV 19 30.25 155 3.75 409 1 6.2 680 RF8

NORTH PIT NPT 19 24.90 155 17.00 1115 3 1.34

OUTLET OTL 19 23.38 155 16.94 1038 3 5.0

PUU HULUHULU PHH 19 22.45 155 12.66 988 3

PUU HONUAULA PHO 19 28.90 154 53.40 215 1 6.5 2720 RFI

PUU PILI PPL 19 9.50 155 27.87 35 1 4.4 1360 RFll

SOUTH POINT SPT 18 58.91 155 39.92 244 1 7.8 2040 RF7

WAHAULA WHA 19 19.90 155 2.92 29 1 6.0 680 RF9

WALDRON LEDGE WLG 19 25.49 155 15.69 1067 3

OPTICAL SEISMOGRAPHS

HALEAKALA Z HAL 20 46.00 156 15.00 2090 3 0.71

HALEAKALA EW HAE 20 46.00 156 15.00 2090 0 1.0 Wood-Anderson

HALEAKALA NS HAN 20 46.00 156 15.00 2090 0 1.0 Wood-Anderson

HILa Z HIL 19 43.20 155 5.30 20 3 1.0

HILa EW HIE 19 43.20 155 5.30 20 a 1.0 Wood-Anderson

HILO NS HIN 19 43.20 155 5.30 20 a 1.0 Wood-Anderson

KIPAPA KIP 21 25.40 158 .90 76 3 0.56

UWEKAHUNA Z UWE 19 25.40 155 17.60 1240 3 0.7

UWEKAHUNA Z USZ 19 25.40 155 17.60 1240 4 1.0

UWEKAHUNA EW USE 19 25.40 155 17.60 1240 4 1.0

UWEKAHUNA PEZ 19 25.40 155 17.60 1240 15-90 Press Ewing

UWEKAHUNA PEE 19 25.40 155 17.60 1240

UWEKAHUNA PEN 19 25.40 155 17.60 1240

23
Table 5.--Seismic Instrumentation Types

Type 1. Consists of:

a) EV-17 - Electrotech EV-17 1.0 sec. period moving magnet

vertical component seismometer or horizontal

component adjusted for an output of 0.5 volts/cm/

sec and 0.8 critically damped.

b) Preamp/VCO - Develco Model 6202 voltage controlled oscillator

or a USGS/NCER Model JE202. 3 db points for bandpass

filter at 0.1 Hz and 30 Hz. Signals are trans~itted

on audio FM carrier over cable or FM radio link to HVO.

Type 2. Consists of:

a) EV-17 - Electrotech EV-17 1.0 sec. period moving magnet

vertical or horizontal component seismometer.

b) 3.5 Hz galvanometer with appropriate shunt resistances for

critical damping. System is poorly calibrated.

Type 3. Consists of:

a) EV-17 Electrotech EV-17 (as described above), Hall-Sears HS-IO

0.5 sec. period moving coil seismometer or Observatorybuilt 0.8 sec. period moving coil seismometer with

HVO-built solid state seismic preamplifier (voltage

gain, 200X) , direct signal transmission over cable to

HVO and HVO-built solid state amplifier and galvanometer

driver, or Observatory-built electromagnetic seismometer

with 2 Hz galvanometer. Peak magnification approximately

40,000 at 4 Hz.

Type 4. Consists of:

Sprengnether short period vertical and horizontal seismometers

(E-W) with 1.5 sec. galvanometers, coupling factor

0.25, 2X critically damped. Peak magnification

approximately 1500X at 2 Hz.

Experimental type amplifier systems are not given type numbers.

24
10 5

Period (sec)

2 I 0.5 0.2 0.1 0.05 0.02 0.01

, ~---- , I. ',,,

,.I " " ", l "'Type 3

,

l 'Type 2

------------ II ~.' Wood - Anderson

I ••••••••-.

I r· •• I .,- ••••

I • •• I .. -.

I I••..•

II • •• I,:: ... Type 4

I

II

e:

0

.-

c

10 0 4

"le:

C'

c

::E

10 3

0.01 0 ..1 I 10

Frequency (Hz)

100

Figure 2.--System response curves for the Wood-Anderson torsion

seismograph and for the four different types of seismometeramplifier (or galvanometer) combinations in use by the

Hawaiian Volcano Observatory.

25
TILTING OF THE GROUND AROUND KILAUEA CALDERA

Tilting of the ground around the summit of Kilauea is monitored

daily by a short-base water-tube tiltmeter in Uwekahuna Vault, and

at irregular intervals it is measured on a regional scale by means

of a network of field tilt-bases and a portable water-tube tiltmeter.

The attitude of the ground surface at each tilt-base is reported in

terms of north-south and east-west tilt coordinates. Both coordinates at each station were arbitrarily set equal to 500 when

measurements at that station were begun. Increasing tilt coordinates

correspond to northward and eastward tilting of the earth's surface;

that is, to a relative subsidence toward the north and east. A one~

unit change in coordinate corresponds to a tilting of 1 microradian

(1 rom per km) in the direction indicated.

Location data on each ti1tmeter station are listed in Table 7,

Sunnnary 65.

Table 6.--Tilt Coordinates at Uwekahuna,

October, November, and December 1972

Date N-S E-W Date N-S E-W

Oct. 1 726 326 Dec. 3 722 318

8 726 323 10 722 317

15 725 323 17 722 318

22 726 323 24 721 317

29 725 321 31 721 319

Nov. 5 724 320

12 724 319

19 723 317

26 723 318

26
Table 7.--Tilt coordinates and changes at bases around Kilauea caldera. (See Fi

Tilt base Date

(1972)

Tilt

N-S

Coordinates

E-W

-6 Rate (10 rad/mo)

and direction of

tilting since

last reading

Uwekahuna (U on fig. 3) 5 Dec 746.3 353.5 0.87 S3l.9°E 

N Tree Molds (TM) 5 Dec 580.3 483.2 0.45 S 8.4°E 

'-J

Sand Split (SS) 6 Dec 1022.4 726.1 3.06 S13.OoE 

Mehana (M) 5 Dec 612.5 601.7 0.40 N19.2°E 

Keamoku (Kea) 5 Dec 777.6 228.2 3.09 S30.9°E 

Ahua Kamokuk01au (Kam) 6 Dec 376.1 535.6 3.30 

Kipuka Nene (KN) 7 Dec 279.9 498.5 0.31 N29.4°W 

Hilina Pali (HP) 7 Dec 457.6 487.2 0.32 N66.0oW 

Kapapa1a Ranch (Kap) 6 Dec 480.2 523.1 0.50 N82.4°E 
TILTING RATE 1.0 X 10-6 RADIANS/MONTH

5KM

Figure 3.--Tilting of the grourid around Kilauea Caldera. The vector

depicting tilting at a given tilt base points in the direction of

maximum relative subsidence, and its length is proportional to the

rate of tilting during the measurement interval. Closed circles repl~sent field tilt bases; open circles, short-base watertube tiltmeters~ See Table 7 for explanation of abbreviations.

28
Publications of Special Interest

and HVO Contributions, 1972

Duffield, W. A., 1972, A naturally occurring model of global plate

tectonics: Jour. Geophys. Res., vol. 77, no. 14, p. 2543-2555.

Duffield, W. A., 1972, Kilauea Volcano provides a model for plate

tectonics: Geotimes, p. 19-21, v. 17, no. 4.

Fiske, R. S., and Jackson, E. D., 1972, Orientation and growth of

Hawaiian volcanic rifts: The effect of regional structure and

gravitational stresses: Proc. R. Soc. Lond. A. 329, p. 299-326.

Jackson, D. B., and Keller, G. V., 1972, An electromagnetic sounding

survey of the stunmit of Kilauea Volcano, Hawaii: Arn. Geophys.

Union, v. ,77, no. 26, p. 4957-4965.

Keller, G. V., Jackson, D. B., and Rapolla, Antonio, 1972, Magnetic

noise preceding the August 1971 summit eruption of Kilauea Volcano:

Science, v. 175, p. 1457-1458.

Koyanagi, R. Y., Swanson, D. A., and Endo, E. T., 1972, Distribution

of earthquakes related to mobility of the south flank of Kilauea

Volcano, Hawaii: U.S. Geol. Survey Prof. Paper 800-D, p. D89-D97.

McDougall, Ian, and Swanson, D. A., 1972, Potassium-Argon Ages of Lavas

from the Hawi and Pololu Volcanic Series, Kohala, Volcano, Hawaii:

Geol. Soc. Arn. Bull., v. 83, p. 3731-3738.

Swanson, D. A., 1972, Magma supply rate at Kilauea'Volcano, 1952-1971:

Science, v. 175, p. 169-170.

Swanson, D. A., and Peterson, D. W., 1972, Partial draining and crustal

subsidence of Alae lava lake, Kilauea Volcano, Hawaii: U.S. Geol.

Survey Prof. Paper 800-C, p. CI-C14.

Swanson, D. A., Duffield, W. A., Jackson, D. B., and Peterson, D. W.,

1972, The complex filling of Alae Crater, Kilauea Volcano, Hawaii:

Bull. Volcanologique, Tome XXXVI-I, p. 105-126.

Reference Cited

Hamilton, R. M., B. E. Smith, J. C. Hall, and J. H. Healy, 1969,

Summary of seismic activity in the Pahute Mesa area, Nevada

Test Site, December 1968 - June 30, 1969: u.S. Atomic Energy

Connn. (USGS-474-58): Springfield, Va., Clearinghouse for

Federal Sci. and Tech. Inf., 63 p.

29