U.S. GEOLOGICAL SURVEY CIRCULAR 1044 

Catalogue of U.S. Geological Survey 

Strong-Motion Records, 1987 

ML = 5.9 WHITTIER NARROWS EARTHQUAKE 

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Catalogue of U.S. Geological Survey 

Strong-Motion Records, 1987 

Compiled by RONALD L. PORCELLA and 

JOSEPHINE C. SWITZER 

U.S~ GEOLOGICAL SURVEY CIRCULAR 1044 
DEPARTMENT OF THE INTERIOR 

MANUEL LUJAN, JR., Secretary 

U.S. GEOLOGICAL SURVEY 

Dallas L. Peck, Director 

Any use of trade, product, or firm names in this publication 

is for descriptive purposes only and does not imply 

endorsement by the U.S. Government 

UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON 1989 

Free on application to the 

Books and Open-File Reports Section, 

U.S. Geological Survey, Federal Center, 

Box 25425, Denver, CO 80225 

Library of Congress Catalog Card No. 83-600616 

Front Cover: This figure is a finite element model showing the relative displacements 

(rotation time history) measured at the 12th and 32d floors of the JCG Finance Corp. 

building at 1100 Wilshire Boulevard in Los Angeles during the ML =5.9 Whittier Narrows 

earthquake (Celebi and others, 1989). The 33~story building is a 21~story triangular-in~plan 

tower above a 12~story rectangular-in-plan structure; a common rigid frame in the core 

connects the two configurations. The earthquake was recorded on 21 acceleration sensors 

strategically located at the basement, ground, 12th, 13th, and 32d floors so as to detect any 

translational, torsional, or rocking motions of the structure. These records show that the 

building responded in the coupled translation torsional mode; however, the torsional is a 

second mode such that the upper triangular tower rotated in an opposite sense when 

compared to the lower rectangular structure. 

Reference: Celebi, M., Safak, E., and Youssef, N., 1989, Analysis of recorded responses of a 

unique building in Los Angeles to motions caused by the Whittier Narrows, California 

earthquake of October 1, 1987: U.S. Geological Sutvey Open-File Report 89-542,77 p. 
PREFACE 

The first seismic engineering program in the United States was administered by 

the Seismological Field Survey (SFS) of the Coast and Geodetic Survey. This program 

was begun in 1931 and essentially remained the responsibility of the SFS until1973, 

when the U.S. Geological Survey (USGS) assimilated the program into its National 

Earthquake Hazards Reduction Program. The current Federal seismic engineering 

program operates the National Cooperative Strong-Motion Network (NCSMN) with 

nearly 1,000 stations in 41 States and Puerto Rico. This network is administered by the 

USGS in cooperation with both private industry and numerous Federal, State, and 

local agencies and organizations. Major contributors include the Army Corps of 

Engineers, the Veterans Administration, and the Metropolitan Water District of 

Southern California. Primary objectives of the program are to record strong ground 

motions and the response of representative engineered structures during moderate to 

large earthquakes, and to disseminate the resultant data and information about the 

records, sites, and structures to the earthquake engineering research and design 

community. 

This catalogue continues in a revised format the yearly publication "StrongMotion Program Report, January-December [year]; it is a continuation of the table 1 

summary of accelerograms recovered at NCSMN stations that had been published in 

that format since 1974. This report includes all accelerograms recovered during 1987. 

Unless otherwise noted, event data are from the "Preliminary Determination of 

Epicenters," published weekly by the U.S. Geological Survey. 

CONTENTS 

Preface III 

Introduction 1 

References 1 

TABLE 

1. Catalogue of National Cooperative Strong-Motion Network accelerograph 

records recovered during 1987 3 

Contents V 

Catalogue of U.S. Geological Survey 

Strong-Motion Records, 1987 

Compiled by Ronald L. Porcella and Josephine C. Switzer 

INTRODUCTION 

Nearly 550 accelerograph records were recovered from the National Cooperative Strong-Motion Network (NCSMN) during 1987. This compares with an annual 

average of 247 records for the period 1974 through 1986. U.S. Geological Survey 

NCSMN stations in California, Alaska, and Hawaii recorded 11 earthquakes of 

M=5.0 or greater during 1987, including the ML =5.9 Whittier Narrows earthquake 

on October 1 and the ML =6.1 Superstition Hills earthquake on November 24. 

Accelerographs at 52 NCSMN stations in the Los Angeles region were 

triggered by the October 1 Whittier Narrows main shock and produced 358 channels 

of acceleration data. These data include recordings from extensively instrumented 

structures such as high-rise buildings in Los Angeles, Norwalk, and Newport Beach, 

a hospital in Lorna Linda, a reservoir near Live Oak, and a base-isolated pipeline 

bridge across the Santa Ana River. 

Maximum recorded acceleration was 0.63 gat the basement level of a 10-story 

building in Whittier. Within an epicentral distance of 25 km, 14 stations produced 

peak horizontal ground motions in excess of 0.15 g (see Etheredge and Porcella, 

1987). 

The ML =5.3 Whittier Narrows aftershock on October 4, 1987, produced 

strong-motion records at 30 of the 52 NCSMN main-shock stations. These stations 

include 11 buildings, 9 dams, 4 hospitals, and 5 ground sites at epicentral distances 

ranging from 2 to 57 km. Significant ground motions were recorded at 6 stations 

within an epicentral distance of 12 km and are in the range 0.15 to 0.33 g (Etheredge 

and Porcella, 1988). 

Two moderate-sized earthquakes occurred on November 24 in the northwest 

Imperial Valley of California. The first event (ML =5.8) triggered accelerographs at 

24 NCSMN stations; the second event (ML =6.1) triggered instruments at 39 NCSMN 

stations. Six station records exceed 0.1 g for the first event, and 25 records from 

stations within 60 km contain peak horizontal ground motions in excess of 0.1 g 

(Porcella and others, 1987). 

Additional magnitude 5 or greater earthquakes recorded at NCSMN stations in 

1987, including the date, location, magnitude, and number of NCSMN stations 

triggered, are as follows: Feb. 4, Hawaii, 5.2, four records; Feb. 7, southern Calif., 5.4, 

one record; Feb. 14, central Calif., 5.2, two records; April 18, Alaska, 5.7, five records; 

July 31, northern Calif., 5.4, seven records; Nov. 11, Alaska, 7.0, four records; and 

Nov. 30, Alaska, 7.1, seven records. 

Manuscript approved for publication, November 21, 1989. lntroducti"'n 1 
REFERENCES 

Etheredge, E., and Porcella, R., 1987, Strong-motion data from the October 1, 1987 Whittier 

Narrows Earthquake: U.S. Geological Survey Open-File Report 87-616, 64 p. 

Etheredge, E., and Porcella, R., 1988, Strong-motion data from the Whittier Narrows 

aftershock of October 4, 1987: U.S. Geological Survey Open-File Report 88--38, 32 p. 

Porcella, R., Etheredge, E., Maley, R., and Switzer, J., 1987, Strong-motion data from the 

Superstition Hills earthquakes of 0154 and 1315 (Gmt), November 24, 1987: U.S. 

Geological Survey Open-File Report 87-672, 56 p. 

2 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 19f'7 

[Station owners: ACOE, U.S. Army Corps of Engineers; BECH, Bechtel Power Corporation; COOT, 

California Department of Transportation; CDWR, California Department of Water Resources; CI~, 

California Institute of Technology; DOE, U.S. Department of Energy; GLDN, U.S. Geological Survey, Golden, Colorado; JCG, JCG Finance Corporation of America; MANC, Municipality of 

Anchorage, Alaska; MWD, Los Angeles Metropolitan Water District; USGS, U.S. Geological Survey; 

VA, U.S. Veterans Administration. Instrument trigger time in minutes and seconds after the 

hour listed in earthquake column. Trigger time in brackets is P-wave arrival time as event 

occurred while instrument was in operation. S-minus trigger denotes ~-wave-arrival-minustrigger-time (S-t) or S-wave-minus-P-wave-arrival time (S-P, in brackets) interval. Direction 

lS of case acceleration for upward trace deflection on accelerogram; horizontal components are 

listed as azimuth, and vertical components as "up" or "down." Maximum amplitude is peak 

acceleration recorded at ground level on one vertical and two orthogonal horizontal components unless otherwise noted. Duration is interval between first and last peaks of acceleration 

greater than 0.10 ~-] 

Earthquake 

3 January 1987 

1309 G.m.t. 

Hawaii 

Epicenter and 

magnitude unknown 

3 January 1987 

1801:06.2 G.m.t. 

Southern Calif. 

33.500N, 116.480W 

Magnitude 3.5 ML 

28 April 1986-

12 January 1987 

Central Calif. 

Epicenter and 

magnitude unknown 

16 January 1987 

1252 G.m.t. 

Hawaii 

Epicenter and 

magnitude unknown 

19 January 1987 

0809:04.4 G.m.t. 

Central Calif. 

37.150N, 121.582W 

Magnitude 4.3 ML 

21 January 1987 

1118:27.3 G.m.t. 

Eastern Calif. 

37.442N, 118.382~ 

Magnitude 3.4 ML 

Station name 

(owner) 

Honokaa, Hawaii 

Police Station 

(USGS) 

Pinyon Flat Observ. 

ANZA Array 

(USGS) 

Milpitas, Forshee 

759 Rivera Street 

(USGS} 

Honokaa, Hawaii 

Police Station 

(USGS} 

Anderson Dam 

Morgan Hi 11 

(USGS} 

Downstream 

Chalfant Valley Fire Station 

(USGS) 

Laws, Calif. 

Northeast Bishop 

(USGS) 

Station 

location 

(0) 

20.080N 

155.465W 

33.61 N 

116.46 w 

37.450N 

121.896W 

20.080N 

155.465W 

37.165N 

121.631W 

37.53 N 

118.37 w 

37.402N 

118.346W 

Trigger S-minus Direction 

time trigger (az) 

( s) 

09:17.54 (2) 

01:10.1 (2) 

(J) 0.5 

52:51.04 (2) 

(J) 0.8 

18:31.74 (2) 

18:27.74 (2) 

Maximum Duration 

amplitude (s) (~) 

(1) 

(1) 

(1) 

(1} 

(1) 

(1) 

(1) 

Table 1 3 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovP.red during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner} location time trigger (az} amplitude ( s} 

(0} ( s} (.g.) 

21 January 1987 Chalfant Valley 37.53 N 43:01.44 2.3 (1) 

1142:57.1 G.m.t. Fire Station 118.37 w 

Eastern Calif. (USGS} 

37.447N, 118.382W 

Magnitude 3.5 ML 

27 January 1987 South Hammil Valley 37.62 N 57:16.64 1.4 (1) 

1757:11.3 G .m. t. White Mountain Ranch 118.39 w 

Eastern Calif. (USGS} 

37.608N, 118.463W 

Magnitude 3.8 ML 

4 February 1987 Honokaa, Hawaii 20.080N 23:04.14 (2} (1} 

0222:32.7 G.m.t. Police Station 155.465W 

Hawaii (USGS) 

20.053N, 156.530W 

22:58.7 Magnitude 4 5.2 ML Kealakekua, Hawaii 19.523N (2) (1) 

Kana Hospital 155.879W 

(USGS) 

Kapaau, Hawaii 20.230N 22:57.44 (2} 102 .06 

Kohala Police Station 155.801W Up .03 

(USGS) 012 .04 

Mauna Kea, Hawaii 19.752N 0 4 23.04.2 (2) (1) 

State Park 155.530W 

(USGS) 

7 February 1987 Calexico 32.67 N 45:23.3 4.3 (1) 

0345:14.7 G.m.t. Fire Station 115.49 w 

Southern Calif. (USGS) 

32.390N, 115.310W 

Magnitude 5.4 ML 

14 February 1987 Coalinga 36.229N 26:54.3 2.2 360 .21 0.4 

0726:51.7 G.m.t. Oil City 120.360W Up .07 

Central Calif. (USGS) 270 .26 0"6 

36.148N, 120.335W 

Magnitude 5.2 ML Hidden Dam 37.112N 27:22.5 (2) 

(ACOE} 119.883W 

Left Crest (1) 

21 February 1987 Chalfant Valley 37.53 N 05:36.84 0.7 (1) 

1205:32.4 G.m.t. Fire Station 118.37 w 

Eastern Calif. (USGS) 

37.510N, 118.400W 

Magnitude 3.1 ML 

21 February 1987 Bear Valley Station 1 36.573N 02:27.1 (2) (1) 

1302:19.6 G.m.t. CDF Fire Station 121.184W 

Central Calif. (USGS} 

36.590N, 121.228W 

Magnitude 3. 3 ML 

4 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude (s) (0) ( s) (.gJ 

21 February 1987 Sycamore Forest Sta. 34.193N 15:33.7 (2) (1) 2315:29.9 G.m.t. Angeles Forest 117 .426W 

Southern Calif. (USGS) 

34.130Nt 117.450W 

Magnitude 3.9 ML 

25 February 1987 McGee Creek 37.550N 15:44.2 (2) (1) 0615 G.m.t. Mammoth Lakes 118.811W 

Eastern Calif. (USGS) SMA-1 

Epicenter and 

magnitude unknown McGee Creek 37.550N 15:44.2 (2) Mammoth Lakes 118.811W 

(USGS) CRA-1 

166 m downhole (1) 

35 m downhole (1) 

Surface (1) 

1 m downhole (1) 

26 February 1987 McGee Creek 37.550N 02:00.5 0.8 360 .09 

1302:00.2 G.m.t. Mammoth Lakes 118.811W Up .04 

Eastern Calif. (USGS) SMA-1 270 .05 

37.547Nt 118.890W 

Magnitude 3.5 ML Note: CRA-1 failed during 26 February earthquake (1302:00.2 G.m.t.). 

27 February 1987 McGee Creek 37.550N 24:58.9 (2) 360 .06 

1624:57.7 G.m.t. Mammoth Lakes 118 .811W Up .03 

Eastern Calif. (USGS) SMA-1 270 .05 

37.542Nt 118.887W 

Magnitude 3.9 ML McGee Creek 37.550N 24:58.9 (2) Mammoth Lakes 118.811W 

(USGS) CRA-1 

166 m downhole (1) 

35 m downhole (1) 

Surface 360 .06 

Up .05 

270 .06 

1 m downhole (1) 

1 March 1987 McGee Creek 37.550N 11:52.0 (2) (1) 0911:50.3 G.m.t. Mammoth Lakes 118 .811W 

Eastern Calif. (USGS) SMA-1 

37.482Nt 118.853W 

Magnitude 3.1 ML 

Table 1 5 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recove¥ed during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximun Duration 

(owner) location time trigger (az} amplitude (s) 

(0) ( s) (.gJ 

1 March 1987 McGee Creek 37.550N 11:52.0 (2) 0911:50.3 G.m.t. Mammoth Lakes 118 .811W 

Eastern Calif. (USGS) CRA-1 

37.482N, 118.853W 

Magnitude 3.1 ML-- 166 m downhole (1) Continued 

35 m downhole (1) 

Surface (1) 

1 m downhole (1) 

5 March 1987 Bear Valley Station 1 36.573N 55:27.0 (2) (1) 0655:25.2 G.m.t. CDF Fire Station 121.184W 

Central Calif. (USGS) 

36.578N, 121.198W 

Magnitude 2.8 ML 

11 December 1986- Waimea, Hawaii 20.03 N (3) (2) (1) 9 March 1987 Fire Station 155.66 w 

Hawaii (USGS) Epicenter and 

magnitude unknown 

11 March 1987 McGee Creek 37.550N 44:42.1 (2) (1) 

1944 G.m.t. Mammoth Lakes 118.811W 

Eastern Calif. (USGS} SMA-1 

Epicenter and 

magnitude unknown McGee Creek 37. 550N 44:42.1 (2) 

Mammoth Lakes 118.8-llW 

(USGS) CRA-1 

166 m downhole (1) 

35 m downhole ( 1} 

Surface (1) 

1 m downhole (1} 

25 March 1987 Waimea, Hawaii 20.026N 25:26.94 (2} (1} 

0625 G.m.t. Fire Station 155.664W 

Hawaii (USGS) 

Epicenter and 

magnitude unknown 

29 September 1986- Livermore 37.625N (3} (2) 

31 March 1987 VA Hospital (B-62} 121.762W 

Central Calif. (VA) 

Epicenter and 

magnitude unknown Basement (1) 

Roof {7th floor) {1) 

6 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative Strong-Motion Netwo~k accelerograph records recovered d·Jring 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude ( s) 

(0) ( s) (.gJ 

10 April 1987 Livermore 37.625N (3) 2.0 

0451:46.4 G.m.t. VA Hospital (B-62) 121. 762W 

Central Calif. (VA) 

37.563N, 121.677W 

Magnitude 3.6 ML Basement (1) 

Roof (7th floor) 125 .05 

Up .01 

035 .02 

16 July 1986- ANZA Array 33.57 N (3) (2) (1) 

11 Apri 1 1987 Rarick Springs 116.52 w 

Southern Calif. (USGS) 

Epicenters and 

magnitudes unknown Note: One additional record(1) recovered at Rarick Springs. 

13 April 1987 Hall ister 36.807N (3) 1.7 (1) 

0947:00.9 G.m.t. Damler Residence 121.408W 

Central Calif. (USGS) 

36.853N, 121.435W 

Magnitude 2.7 ML 

18 April 1987 Anchorage 61.189N (3) (2) 360 .05 

0201:38.8 G.m.t. Pacific University 149.801W Up .01 

Southern Alaska (USGS) 270 .05 

61.374N, 150.656W 

Magnitude 5.7 MB Anchorage 61.230N (3) 8.6 (1) 

Fire Station No. 2 149.864W 

(MANC) 

Anchorage 61.182N (3) (2) (1) 

Fire Station No. 4 149.848W 

(MANC) 

Note: 2 additional records1 recovered at Fire Station No. 4. 

Anchorage 61.21 N 01:50.34 8.8 (1) 

Fire Station No. 6 149.75 w 

(USGS/GLDN) 

Anchorage 61.146N (3) 9.0 ( 1) 

Fire Station No. 7 149.950W 

(MANC) 

12 October 1986- Sunol Wilderness 37.515N (3) 0.4 (1) 

26 April 1987 Regional Park 121.830W 

Central Calif. (USGS) Epicenter and 

magnitude unknown 

27 April 1987 Honokaa, Hawaii 20.080N 41:13.14 (2) (1) 

1641 G.m.t. Police Station 155.465W 

Hawaii (USGS) Epicenter and 

magnitude unknown 

Table 1 7 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude (s} (0} ( s} (g) 

27 April 1987 Imperial Wildlife 33.097N (3} 1.6 (1) 1741:24.0 G.m.t. Liquefaction Array 115.530W 

Southern Calif. (USGS) 

33.060N, 115.570W 

Magnitude 3.5 ML 

30 April 1987 Hollister 36.888N 24:25.5 2.6 (1) 1924:22.2 G.m.t. Differential Array 121. 413W 

Central Calif. (USGS) 

36.840N, 121.283W 

Magnitude 4.1 ML 

15 December 1986- Bear Valley Station 10 36.532N (3) (2} 310 .06 

6 June 1987 Webb Residence 121.143W Up .04 

Central Calif. (USGS} 220 .05 

Epicenters and 

Five additional records magnitudes 1 unknown Note: recovered at Webb Residence. 

6 June 1987 Bear Valley Station 10 36.532N 23:48.4 1.1 (1) 

1623 G.m.t. Webb Residence 121.143W 

Central Calif. (USGS) 

Epicenter and 

magnitude unknown 

21 June 1987 Waimea, Hawaii 20.026N 13:42.8 4 (2) (1} 0613 G.m.t. Fire Station 155.664W 

Hawaii (USGS} Epicenter and 

magnitude unknown 

21 June 1987 McGee Creek 37.550N 16:27.6 (2) (1) 0616:27.3 G.m.t. Mammoth Lakes 118.811W 

Eastern Calif. (USGS) SMA-1 

37.550N, 118.793W 

Magnitude 3.4 ML McGee Creek 37.550N 16:27.6 (2} Mammoth Lakes 118.811W 

(USGS) CRA-1 

166 m downhole (1) 

35 m downhole (1) 

Surface (1} 

1 m downhole (1} 

23 October 1986- Whitewater Trout Farm 33.989N (3) (2) (1) 10 July 1987 (USGS} 116.655W 

Southern Calif. 

Three additional records1 Epicenters and Note: recovered at Whitewater Trout Farn. 

magnitudes unknown 

8 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue 

1987 -Continued 

of National Cooperative Strong-Motion Network accelerograph records recovered during 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude ( s) (0) ( s) (_gJ 

12 ·July 1987 Chalfant Va 11 ey 37.53 N 37:40.14 (2) 360 .05 

1937:30.9 G.m.t. Fire Station 118.37 w Up .03 

Eastern Calif. (USGS) 270 .04 

37.520N, 118.470W 

37:30.7 Magnitude 4 3.1 ML Laws, Calif. 37.402N (2) (1) Northeast Bishop 118.346W 

(USGS) 

29 July 1987 Mina, Nevada 38.434N (3) (2) (1) 0352:32.5 G.m.t. Black Star Mine 118.154W 

Eastern Calif. (USGS) 

38.367N, 118.170W 

Magnitude 4.6 ML 

31 July 1987 Eel River Valley Array 40.498N 57:04.2 0.7 360 .13 

2356:58.0 G.m.t. Bunker Hill FAA 124.294W Up .03 

Northern Calif. (USGS) 270 .09 

40.415N, 124.407W 

Magnitude 5.5 ML Eel River Valley Array 40.79 N (3) (2) 060 .09 

Butler Valley Sta. 2 123.88 w Up .02 

(USGS) 330 .07 

Eel River Valley Array 40.563N (3) 2.6 360 .26 3.5 

Centerville Beach 124.348W Up .15 0.3 

(USGS) 270 .24 2.7 

Eel River Valley Array 40.699N (3) 6.0 360 .08 

College of Redwoods 124.200W Up .04 

(USGS) 270 .08 

Eel River Valley Array 40.599N (3) 5.4 360 .22 1.5 

Fortuna Fire Station 124.154W Up .07 

(USGS) 270 .08 

Eel River Valley Array 40.644N (3) 5.5 360 .17 2 peaks Loleta Fire Station 124.219W Up .14 0.9 

(USGS) 270 .13 0.6 

Eel River Valley Array 40.735N {3) 5.3 360 .05 

South Bay Union School 124.207W Up .04 

(USGS) 270 .11 1 peak 

3 August 1987 Mina, Nevada 38.434N (3) (2) (1) 0948:03.7 G.m.t. Black Star Mine 118.154W 

Eastern Cal i.f. (USGS) 

38.390N, 118.060W 

Magnitude 4.4 ML 

17 August 1987 Bear Valley Station 10 36.532N 28:08.9 1.1 310 .06 

1428:07.4 G.m.t. Webb Residence 121.143W Up .03 

Central Cal if. (USGS) 220 .10 1 peak 36.555N, 121.158W 

Magnitude 2.8 ML 

Table 1 9 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude ( s) 

(0) ( s) (gJ 

25 August 1987 Lone Pine Canyon 34.32 N 27:28.4 1.3 (1) 

0627:26.6 GMT (USGS) 117.57 w 

Southern Calif. 

34.360N, 117.580W 

Magnitude 3.6 ML 

4 December 1986- Diemer Filter Plant 33.91 N (2) (2) 

26 August 1987 (MWD) 117.82 w 

Southern Calif. 

Epicenters and Basement ( 1) 

magnitudes unknown 

Reservoir Roof (1) 

Note: One additional record1 recovered in the basement and 

on the reservoir roof at Diemer Filter Plant. 

1 September 1987 Salton Sea 33.18 N 56:43.1 (2) (1) 

1656 G.m.t. Wildlife Refuge 115.62 w 

Southern Calif. (USGS) 

Epicenter and 

magnitude unknown 

7 September 1987 Fairbanks 64.85 N (3) (2) (1) 

1314:56.9 G.m.t. University of Alaska 147.82 w 

Central Alaska Duckeri ng Ha 11 

64.955N, 147.929W (USGS) 

Magnitude 4. 2 ML 

Fairbanks 64.86 N (3) 2.2 (1) 

University of Alaska 147.83 w 

Magnetic Observatory 

(USGS) 

14 September 1987 Bear Valley Station 1 36.573N 12:52.8 (2) (1) 

0712 G.m.t. CDF Fire Station 121.184W 

Central Calif. (USGS) Epicenter and 

magnitude unknown 

1 October 1987 Garvey Reservoir 34.05 N (3) 0.2 060 .33 4.6 

1442:20.0 G.m.t. Abutment Bldg. 118.11 w Up .38 5.0 

Southern Calif. (MWD) 330 .47 4.3 

34.060N, 118.080W 

Magnitude 5.9 ML 

Whittier Narrows Dam 34.03 N (3) 0.8 

(ACOE) 118.05 w 

Crest 033 .31 4.3 

Up .19 3.8 

303 .32 2.5 

Upstream 152 .31 4.4 

Up .46 6.2 

062 .24 2.6 

1 o Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue 

1987 -Continued 

of National- Cooperative Strong-Motion Network accelerograph records recovered c'uring 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude ( s) 

(0) ( s) ~) 

1 October 1987 Alhambra 34.09 N (3) 1.7 

1442:20.0 G.m.t. 900 S. Fremont Ave. 118.15 w 

Southern Calif. (USGS) 

34.060N, 118.080W 

Magnitude 5.9 ML-- Basement 090 .30 3.7 

Continued Up .19 3.2 

360 .26 3.4 

6th Floor 090 .47 5.2 

Up .18 3.8 

360 .37 6.0 

12th Floor 090 .28 3.4 

Up .29 5.5 

360 .23 4.8 

Note: Five each additional records1 recovered from basement, 6th and 

12th floors at Alhambra. 

Whittier 33.977N (3) 0.3 

7215 Bright Ave. 118.036W 

(USGS) 

Basement 180 .40 1.9 

Up .26 4.0 

090 .63 3.0 

5th Floor 180 • 61 3.0 

Up .34 4.2 

090 .60 6.6 

lOth Floor 180 .41 3.5 

Up .54 6.0 

090 .54 6.3 

Los Angeles 34.081N (3) (2) 130 .33 2.8 

4407 Jasper Street 118 .188W Up .13 2.1 

(USGS) 040 .23 2.9 

Note: Partial record, film fogged for approx. the first 3 sec. after 

triggering. 

Los Angeles 33.99 N (3) 0.9 010 .34 4.3 

Bulk Mail Center 118.16 w Up .52 3.8 

(USGS) 280 .46 4.2 

Vernon 34.00 N (3) 2.9 007 .29 2.6 

4814 Lorna Vista Ave. 118.20 w Up .17 2.8 

(USGS) 277 .22 2.6 

Morris Dam 34.17 N (3) (2) 246 .04 

Left Abutment 117.88 w Up .04 

(MWD) 156 .05 

Table 1 11 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake 

1 October 1987 

1442:20.0 G.m.t. 

Southern Calif. 

34.060N, 118.080W 

Magnitude 5.9 ML--

Continued 

Station name 

(owner) 

Norwalk, 12400 

Imperial Highway 

(USGS/BECH) 

Basement 

4th Floor 

Roof 

South Ground Site 

Station 

location 

(0) 

33.92 N 

118.07 w 

Trigger S-minus Direction Maximun Duration 

time trigger (az) amplitude (s) 

(s) (~) 

(3) 2.4 

090 .12 1 peak 

Up .07 

360 .21 1.6 

090 .17 0.4 

Up .12 1 peak 

360 .33 4.7 

090 .21 5.9 

Up .18 2.8 

360 .40 6.7 

090 .10 1 peak 

Up .09 

360 .29 2.0 

Note: Two additional records1 recovered at south ground site. 

Norwalk, 12440 33.92 N 42:24.7 2.8 

Imperial Highway 118.07 w 

(USGS/BECH} 

Basement 090 .11 1 peak 

Up .10 1 peak 

360 .21 1.3 

North Ground Site 090 .13 0.4 

Up .13 0.2 

360 .24 1.3 

South Ground Site 090 .09 

Up .10 1 peak 

360 .21 1.3 

Structure Array 1: 

Ch. 1- 8th Floor (Roof) Center 090 .18 7.1 

Ch. 2- 5th Floor, Center 090 .15 5.4 

Ch. 3- 2nd Floor, Center 090 .12 2 peaks 

Ch. 4- 1st Floor, Center 090 .13 1.0 

Ch. 5- Basement, East 360 .19 0.7 

Ch. 6- 5th Floor, West-Center 360 .23 8.7 

Ch. 7- Basement, Center Up .05 

Ch. 8- Bas~ment, Center 090 .11 0.7 

Ch. 9- Basement, Center 360 .20 0.9 

Ch. 10- 30 ft. Downhole, Bldg. Center Up .05 

Ch. 11- 30 ft. Downhole, Bldg. Center 090 .10 0.2 

Ch. 12- 30 ft. Downhole, Bldg. Center 360 .16 0.4 

12 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake 

1 October 1987 

1442:20.0 G.m.t. 

Southern Calif. 

34.060N, 118.080W 

Magnitude 5.9 ML--

Continued 

Station name 

(owner) 

Station 

location 

(0) 

Norwalk, 12440--Continued 

Structure Array 2: 

Ch. 13- 8th Floor (Roof), East 

Ch. 14- 5th Floor, East 

Ch. 15- 2nd Floor, East 

Ch. 16- 1st Floor, East 

Trigger 

time 

Ch. 17- 8th Floor (Roof), Center 

Ch. 18- 5th Floor, Center 

Ch. 19- 2nd Floor, Center 

Ch. 20- 1st Floor, Center 

Ch. 21- 8th Floor (Roof), West 

Ch. 22- 5th Floor, West 

Ch. 23- 2nd Floor, West 

Ch. 24- 1st Floor, West 

Note: Channel 18 failed after 2.5 sec. 

Los Angeles 34.07 N (3) 

1111 Sunset Blvd. 118.25 w 

(MWD) 

Basement 

4th Floor 

Roof 

S-minus Direction Maximum 

trigger (az) amplitude 

( s) (.~) 

360 .31 

360 .14 

360 .17 

360 .18 

360 .41 

360 • 26 

360 .30 

360 .23 

360 .27 

360 .12 

360 .19 

360 .22 

2.4 

348 .16 

Up .07 

258 .11 

348 .19 

Up .09 

258 .11 

348 .18 

Up .22 

258 .15 

Duration 

(s) 

9.5 

0.3 

0.5 

1.1 

14.7 

2.1 

1.6 

11.2 

1.7 

0.5 

1.4 

2.2 

0.7 

4.0 

1 peak 

3.8 

3.8 

1.9 

Note: Three each additional records1 recovered from basement, 4th floor 

and roof at 1111 Sunset Boulevard. 

Los Angeles 34.12 N 

Griffith Park Observ. 118.30 W 

(USGS) 

(3) 2.3 360 

Up 

270 

.13 

.06 

.15 

2.2 

2.0 

Note: One additional record1 recovered at Griffith Park Observatory. 

Orange County Resvr. 33.935N (3) 

(MWD) 117.883W 

Abutment 

Long Beach, CSULB 

Humanities Bldg. 

Basement (USGS) 

33.777N 

118.112W 

(3) 

1.2 

4.5 

096 .23 1.7 

Up .10 0.2 

006 .21 1.5 

104 .09 

Up .05 

014 .09 

Table 1 13 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) ampl itud~ (s) ( 0) ( s) (.g.) 

1 October 1987 Los Angeles 34.052N 42:24.5 2.9 

1442:20.0 G.m.t. 1100 Wilshire Blvd. 118.263W 

Southern Calif. (JCG/USGS) 

34.060N, 118.080W 

Magnitude 5.9 ML-- Basement 3, NE 298 .18 1.1 

Continued Up .07 

208 .12 1.3 

Basement 3, SE 298 .18 0.8 

Up .07 

208 .11 0.2 

Basement 4, NW 298 .17 1.0 

Up .08 

208 .11 1 peak 

Structure Array: 

Ch. 1- 12th Floor, North 298 .13 2 peaks 

Ch. 2- 12th Floor, North 208 .24 1.2 

Ch. 3- 12th Floor, South 208 .10 0.4 

Ch. 4- 13th Floor, North 298 .14 3 peaks 

Ch. 5- 13th Floor, North 208 .26 3.2 

Ch. 6- 13th Floor, South 208 .12 2 peaks 

Ch. 7- 32nd Floor, North 298 .17 1.6 

Ch. 8- 32nd Floor, North 208 .19 5.2 

Ch. 9- 32nd Floor, South 208 .10 1 peak 

Ch. 10- Ground Floor, North 298 .17 1.8 

Ch. 11- Ground Floor, North 208 .21 1.7 

Ch. 12- Ground Floor, South 208 .15 2 peaks 

Brea Dam 33.889N (3) 4.0 

(ACOE) 117 .926W 

Crest 130 .31 2.5 

Up .14 1.7 

040 .23 2.5 

Left Abutment 130 .16 1.3 

Up .09 

040 .10 1 peak 

Downstream 130 .32 1.1 

Up .09 

040 .18 0.6 

Note: One additional record1 recovered at Brea Dam crest. 

Lawndale 33.895N (3) 4.1 360 .06 

15000 Aviation Blvd. 118.377W Up .04 

(USGS} 270 .06 

Santa Ana, Orange Cty. 33.75 N (3) 0.5 360 .09 

Engineering Bldg., 117.87 w Up .03 

Basement (USGS) 270 .05 

14 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

-

Earthquake 

1 October 1987 

1442:20.0 G.m.t. 

Southern Calif. 

34.060N, 118.080W 

Magnitude 5.9 ML--

Continued 

Station name 

(owner} 

Carbon Canyon Dam 

(ACOE} 

Crest 

Left Abutment 

Station 

location 

(0} 

33.92 N 

117.84 w 

Trigger S-minus Direction Maximum Duration 

time trigger (az} amplitude (s} 

(s} (g.) 

(3} 4.6 

130 .17 2.4 

Up .13 0.6 

040 .20 3.4 

130 .22 1.8 

Up .07 

040 .16 2.6 

Note: Three additional records1 recovered at Carbon Canyon Dam crest. 

Weymouth Filter Plant 34.114N (3} 3.4 

(MWD} 117.778W 

Bldg., Ground Level 017 .10 1 peak 

Up .05 

287 .06 

Water Tank, Top 017 .15 4.6 

Up .11 0.3 

287 .13 1.3 

Diemer Filter Plant 33.91 N (3} 4.0 

(MWD} 117.82 w 

Admin. Bldg. Basement 281 .09 

Up .04 

191 .06 

Reservoir Roof 281 .11 1 peak 

Up .17 0.3 

191 .11 1 peak 

Note: Two each additional records1 recovered from the administration 

building and reservoir roof at Diemer Filter plant. 

Palos Verdes Estates 33.801N 

Basement 118 .387W 

(USGS) 

Sepulveda Canyon 34.097N 

Spillway Roof 118.478W 

(MWD) 

Live Oak Reservoir 34.134N 

(MWD) 117.753W 

Abutment 

(3) 1.1 

(3) 0.3 

(3) (2) 

166 

Up 

076 

(1) 

.03 

.02 

.08 

180 .04 

Up .02 

090 .03 

Table 1 15 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Haximurr Duration 

(owner) location time trigger (az) amplitude ( s) (0) ( s) (.gJ 

1 October 1987 Live Oak Reservoir--Continued 

1442:20.0 G.m.t. Structure Array: Southern Calif. Ch. 1- Center Crest 155 .07 

34.060N, 118.080W Ch. 2- Center Crest Up .04 

Magnitude 5.9 ML-- Ch. 3- Center Crest 245 .07 

Continued Ch. 4- Left Crest 155 .09 

Ch. 5- Left Crest 245 .08 

Ch. 6- Left Slope 245 .04 

Ch. 7- Center Slope 155 .09 

Ch. 8- Center Slope Up .04 

Ch. 9- Center Slope 245 .06 

Ch. 10- Center Toe 155 .05 

Ch. 11- Center Toe Up .02 

Ch. 12- Center Toe 245 .03 

Long Beach 33.78 N (3) 4.6 

VA Hospital 118.12 w 

(VA) 

Basement 360 .08 

Up .05 

270 .10 1 peak 

6th Floor 360 .17 1.2 

Up .08 

270 .11 1 peak 

11th Floor 360 .26 2.1 

Up .11 1 peak 

270 .16 2.1 

Los Angeles 34.050N (3) 0.5 

Wadsworth VA Hospital 118.452W 

(VA/USGS) 

Bldg. 500 Structure Array: 

Ch. 1- 6th Floor, North End 235 .20 14.3 

Ch. 2- 6th Floor, North Center 235 .15 4.3 

Ch. 3- 6th Floor, Center 235 .15 3.1 

Ch. 4- 6th Floor, Center 055 .18 4.1 

Ch. 5- 6th Floor, South End 055 .25 4.0 

Ch. 6- 6th Floor, South End 325 .13 1.1 

Ch. 7- Basement, North Center 325 .07 

Ch. 8- Basement, North Center 235 .07 

Ch. 9- Basement, North Center Down .04 

North Ground Site 42:27.4 4.7 325 .07 

Up .03 

235 .08 

South Ground Site 42:28.1 4.5 325 .07 

Up .04 

235 .09 

16 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograpt1 records recovered during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude (s) (0) (s) (.y) 

1 October 1987 Los Angeles, Brentwood 34.058N (3) 4.1 285 .04 

1442:20.0 G.m.t. VA Hospital 118.457W Up .03 

Southern Calif. (VA) 195 .05 

34.060N, 118.080W 

Magnitude 5.9 ML-- San Antonio Dam 34.166N (3) 3.1 

Continued (ACOE) 117.680W 

Crest 090 .10 2 peaks 

Up .06 

360 .14 1.9 

Right Abutment 090 .04 

Up .05 

360 .04 

Downstream 090 .07 

Up .04 

360 .05 

Sepulveda Dam 34.17 N (3) 4.9 

(ACOE) 118.47 w 

Crest 054 .09 

Up .09 

324 .14 1 peak 

Downstream 054 .12 1 peak 

Up .07 

324 .15 1 peak 

Note: One additional record1 recovered at Sepulveda Dam downstream. 

Palos Verdes Reservoir 33.774N (3) 2.2 (1} 

Abutment 118.321W 

(MWD} 

Sepulveda VA Hospital 34.249N (3} 5.7 360 .18 2.0 

Ground level 118.475W U-p .10 1 peak (VA) 270 .22 1.1 

Note: Two additional records1 recovered at Sepulveda VA Hospital. 

Valyermo Forest Sta. 34.44 N 42:29.3 4.7 300 .04 -t- Ground level 117.85 w Up .04 - - (USGS) 210 .05 

Topanga Fire Station 34.084N 42:35.2 (2) (I) 

(USGS) 118.600W 

Paradise Springs Camp 34.40 N 42:34.1 (2) (1) 

Ground Level 117.80 w 

(US&S) 

Table 1 17 
Table 1. Catalogue 

1987 -Continued 

of National Cooperative Strong-Motion Network accelerograph records recovered during 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude ( s) (0) ( s) (gJ 

1 October 1987 Prado Dam 33.89 N (3) 5.4 

1442:20.0 G.m.t. (ACOE) 117.64 w 

Southern Calif. 

34.060N, 118.080W Crest 090 .09 

Magnitude 5.9 ML-- Up .06 

Continued 360 .09 

Left Abutment 090 .04 

Up .03 

360 .07 

Downstream 090 .14 0.6 

Up .06 

360 .12 1.0 

Jensen Filter Plant 34.309N (3) 6.8 

(MWD) 118 .499W 

Administration Bldg. 022 .06 

Basement Up .05 

292 .11 1 peak 

Generator Room 022 .09 

Up .06 

292 .16 2 peaks 

Reservoir Roof 022 .22 1.3 

Up .10 1 peak 292 .31 1.6 

Note: Four each additional records1 recovered at the administration 

building and generator room and 3 at the reservoir roof at Jensen 

Filter plant. 

Littlerock Post Office 34.521N (3) 5.9 300 .08 

(USGS) 117.991W Up .07 

210 .07 

Lone Pine Canyon 34.32 N 42:30.4 6.4 120 .05 

(USGS) 117.57 w Up .03 

030 .05 

Malibu Canyon 34.08 N (3} (2) (1) 

Monte Nido Fire Sta. 118.69 w 

(USGS) 

Palmdale Fire Station 34.58 N 42:29.9 6.8 (1) (USGS) 118.11 w 

Lytle Creek 34.26 N 42:39.7 (2) 315 .04 

Mann Residence 117.50 w Up .02 

(USGS) 225 .05 

18 Catalogue of U.S. Geological Survey StrC!ng-Motlon Records, 1987 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake 

1 October 1987 

1442:20.0 G.m.t. 

Southern Calif. 

34.060N, 118.080W 

Magnitude 5.9 ML--

Continued 

Station name 

(owner) 

Station 

location 

(0) 

Trigger S-minus Direction Maximum D-.ration 

time trigger (az) amplitude (s) 

(s) (~) 

Newport Beach 33.618N 

840 Newport Center Dr. 117.878W 

(USGS) 

Structure Array: 

(3) 

Ch. 1- Tower 2, Level 1 (Garage), Center 

Ch. 2- Tower 2, Level 1 (Garage), Center 

Ch. 3- Tower 2, Level 1 (Garage), Center 

Ch. 4- Tower 2, Level 2 (Plaza), West End 

6.1 

Ch. 5- Center Building, Level 2 (Plaza), Center 

Ch. 6- Center Building, Level 2 (Plaza), Center 

Ch. 7- Tower 2, Level 9 (Roof), South End 

Ch. 8- Tower 2, Level 10 (Penthouse), Center 

Ch. 9- Tower 2, Level 10 (Penthouse), Center 

Ch. 10- Tower 1, Level 9 (Roof), East End 

Ch. 11~ Tower 1, Level 10 (Penthouse), Center 

Ch. 12- Tower 1, Level 10 (Penthouse), Center 

Santa Ana River Bridge 33.968N 

(MWD/USGS) 117.447W 

North Abutment 

Recorder Building 

Structure Array: Ch. 1- North Abutment 

Ch. 2- North Abutment 

Ch. 3- North Abutment 

Ch. 4- Mid Span 

Ch. 5- Mid Span 

Ch. 6- Mid Span Ch. 7- Below Bearing Ch. 8- Below Bearing 

Ch. 9- Below Bearing Ch. 10- Above Bearing Ch. 11- Above Bearing 

Ch. 12- Above Bearing 

Mathews Dam 33.852N 

Dike Toe 117.451W 

(MWD) 

Leona Valley Fire Sta. 34.62 N 

(USGS) 118.29 W 

(3) 

(3) 

(3) 

Sunnymead 

.Egg Ranch 

(USGS) 

33.95 N 42:35.7 

117.15 w 

Malibu 

Kilpatrick School 

(USGS) 

34.093N 42:43.1 

118.836W 

2.6 

6.2 

4.5 

9.7 

(2) 

360 

Up 

090 

360 

360 

090 

090 

360 

090 

360 

270 

360 

175 

Up 

085 

346 

Down 

076 

346 

Down 

076 

346 

Down 

076 

346 

Down 

076 

252 

Up 

162 

120 

Up 

030 

.06 

.02 

.03 

.08 

.10 

.06 

.04 

.04 

.08 

.04 

.04 

.06 

.05 

.04 

.05 

.05 

.03 

.04 

.18 

.11 

.12 

.13 

.01 

.06 

.15 

.07 

.08 

.05 

.05 

.09 

.05 

.04 

.03 

(1) 

(1) 

1 peak 

2.3 

1 peak 2 peaks 

3 peaks 

2.2 

Table 1 19 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recoverrr:t during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amp 1 itude: ( s) 

(0) ( s) (gJ 

1 October 1987 Santa Susana 34.23 N (3) (2) 

1442:20.0 G.m.t. (DOE) 118.71 w 

Southern Calif. 

34.060N, 118.080W Ground Station (1) 

Magnitude 5.9 ML--

Continued Building 026, Ground (1) 

Building 356, 325 .07 

3rd Floor Up .03 

235 .07 

Building 462: 

1st Floor (1) 

6th Floor 090 .08 

Up .04 

360 .07 

Building 463, Roof 090 .07 

Up .09 

360 .07 

Colton Interchange 34.06 N (3) (2) (1) 

I-1011-215 117.30 w 

Pier Base Vault (COOT) 

San Bernardino 34.106N 42:36.6 5.2 

County Government Ctr. 117.287W 

(USGS) 

Ground Floor, SW (1) 

Structure Array: 

Ch. 1- 2nd Floor Level, NW 360 .04 

Ch. 2- 2nd Floor Level, NE 090 .03 

Ch. 3- 2nd Floor Level, NE 360 .04 

Ch. 4- 2nd Floor Level, sw 090 .02 

Ch. 5-4th Floor Level, sw 090 .07 

Ch. 6-4th Floor Level, NW 360 .02 

Ch. 7-6th Floor Level, (Roof) NE 090 .05 

Ch. 8-6th Floor Level, (Roof) NW 360 .12 1.4 

Ch. 9-6th Floor Level, (Roof) sw 090 .05 

Ch. 10- Sensor Not Installed (--) (--) (---) 

Ch. 11- 4th Floor Level, NE 090 .02 

Ch. 12- 4th Floor Level, NE 360 .07 

Reche Canyon 34.01 N 42:44.8 (2) (1) 

Olive Dell Ranch 117.22 w 

(USGS) 

Lorna Linda Med. Ctr. 34.05 N (3) (2) (1) 

Basement 117.26 w 

(USGS) 

20 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude (s) 

(0) ( s) (gJ 

1 October 1987 Lorna Linda 34.049N (3) 7.8 

1442:20.0 G.m.t. VA Hospital 117.250W 

Southern Calif. (VA/USGS) 

34.060N, 118.080W 

Magnitude 5.9 ML-- Building 1 Structure Array: Continued Ch. 1- Ground Floor, Center Down .01 

Ch. 2- Ground Floor, Center 180 .03 

Ch. 3- Ground Floor, Center 270 .02 

Ch. 4- 4th Floor, Center 270 .07 

Ch. 5- Ground Floor, North 270 .03 

Ch. 6- 4th Floor, Center 180 .04 

Ch. 7- 4th Floor, North 270 .08 

Ch. 8- Ground Floor, South 180 .01 

Ch. 9- 4th Floor, South 270 .07 

North Ground Site 42:35.2 (2) (1) 

South Ground Site (3) (2) (1) 

1 October 1987 Norwalk, 12440 32.92 N 45:50.8 (2) 

1445:41.4 G.m. t. Imperial Highway 118.07 w 

Southern Calif. (USGS/BECH) 

34.050N, 118.100W 

Magnitude 4.6 ML Basement (1) 

North Freefield (1) 

South Freefield ( 1) 

Structure Arrays 1 and 2 (1) 

Los Angeles 34.052N 45:49.9 (2) 

1100 Wilshire Blvd. 118 .263W 

(JCG/USGS) 

Basement 3, NE (1) 

Basement 3, SE (1) 

Basement 4, NW ( 1) 

Structure Array ( 1) 

1 October 1987 Norwalk, 12440 32.92 N 49:14.4 (2) 

1449:05.9 G.m.t. Imperial Highway 118.07 w 

Southern Calif. (USGS/BECH) 

34.060N, 118.100W 

Magnitude 4.7 ML Basement (1) 

North Freefield (1) 

South Freefield ( 1) 

Table 1 21 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recove·ed during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) 1 ocat ion time trigger (az) amp 1 itucte (s) 

(0) ( s) (.gJ 

1 October 1987 Norwalk, 12440--Continued 

1449:05.9 G.m.t. Structure Arrays 1 and 2 (1) 

Southern Calif. 

34.060N, 118.100W Los Angeles 34.052N 49:09.8 3.0 

Magnitude 4.7 ML-- 1100 Wilshire Blvd. 118.263W 

Continued (JCG/USGS) 

Basement 3, NE ( 1) 

Basement 3, SE (1) 

Basement 4, NW (1) 

Structure Array (1) 

1 October 1987 Los Angeles 34.052N 12:39.8 (2) 

1512:31.7 G.m. t. 1100 Wilshire Blvd. 118.263W 

Southern Calif. (JCG/USGS) 

34.050N, 118.090W 

Magnitude 4.7 ML Basement 3, NE (1) 

Basement 3, SE (1) 

Basement 4, NW (1) 

Structure Array (1) 

1 October 1987 Los Angeles 34.052N 00:01.7 (2) 1559:53.5 G.m.t. 1100 Wilshire Blvd. 118 .263N 

Southern Calif. (JCG/USGS) 

34.050N, 118.090W 

Magnitude 4.0 ML Basement 3, NE ( 1) 

Basement 3, SE (1) 

Basement 4, NW (1) 

Structure Array (1) 

1 October 1987 Whittier 33.977N (3) 2.5 

1442-1957 G.m. t. 7215 Bright Avenue 118.036W 

Southern Calif. (USGS) 

Epicenters and 

magnitudes unknown Basement 180 .09 

Up .04 

090 .09 

5th Floor 180 .08 

Up .04 

090 .08 

180 .08 

Up .05 

090 .10 1 peak 

22 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake Station name 

(owner) 

Station 

location 

Trigger S-minus Direction Maximum Duration 

time trigger (az) amplitude (s) 

(0) ( s) (.g_) 

1 October 1987 7215 Bright Avenue--Continued 

1442-1957 G.m.t. 5th floor 180 .03 

Southern Calif. Up .03 

Epicenters and 090 .07 

magnitudes unknown--

Continued lOth Floor 180 .06 

Up .06 

090 .06 

180 .04 

Up .06 

090 .05 

Note: Three additional records1 in basement, one from 5th floor, and 

two from lOth floor recovered at Whittier. 

1 October 1987 Whittier Narrows Dam 34.03 N (3) 2.1 

1442-2012 G.m.t. (ACOE) 118.05 W 

Southern Calif. 

Epicenters and Crest 033 .10 

magnitudes unknown Up .04 

303 .09 

033 .13 

Up .05 

303 .12 

Upstream 152 .09 

Up .07 

062 .13 

152 .07 

Up .04 

062 .09 

1 peak 

0.2 

0.4 

0.2 

152 .12 

Up .07 

062 .10 

1 peak 

1 peak 

Note: Two additional records1 from crest and four records from upstrea~ 

1 October 1987-

2 October 1987 

Southern Calif. 

Epicenters and 

magnitudes unknown 

recovered at Whittier Narrows Dam. 

Garvey Reservoir 

Abutment Building 

(MWD) 

'34.05 N 

118.11 w 

(3) 

(3) 

(3) 

2.0 

2.0 

2.0 

060 .12 

Up .06 

330 .10 

060 .15 

Up .06 

330 .09 

060 .11 

Up .08 

330 .07 

Note: Seven additional records1 recovered at Garvey Reservoir. 

1 peak 

1 peak 

0.2 

1 peak 

Table 1 23 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recover~ during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude (s) 

(0} ( s) (.g_) 

1 October 1987- Los Angeles 33.996N (3) 2.6 010 .06 

3 October 1987 Bulk Mail Facility 118.162W Up .02 

Southern Calif. (USGS) 280 .06 

Epicenters and 

magnitudes unknown (3) 2.6 010 .12 1 peak 

Up .04 

280 .16 0.4 

(3) 2.6 010 .06 

Up .05 

280 .07 

Note: 7 additional records1 recovered at Los Angeles Bulk Mail Facility. 

1 October 1987- Vernon 34.00 N (3) 2.3 007 .08 

4 October 1987 4814 Lorna Vista Ave. 118.20 w Up .02 

Southern Calif. (USGS) 277 .11 0.2 

Epicenters and 

One additional record magnitudes 1 unknown Note: recovered at Vernon. 

4 October 1987 Garvey Reservoir 34.05 N (3) 1.9 060 .19 0.3 

1059:38.1 G.m.t. Abutment Bldg. 118.11 w Up .13 1.6 

Southern Calif. (MWD) 330 .21 0.7 34.070N~ 118.100W 

Magnitude 5.3 ML Alhambra 34.09 N (3) 1.9 

900 S. Fremont Ave. 118.15 w 

(USGS) 

Basement 090 .15 0.3 

Up .10 1 peak 

360 .11 2 peaks 

6th Floor 090 .24 0.4 

Up .15 l peaks 

360 .17 0.8 

12th Floor 090 .18 0.5 

Up .19 2.7 

360 .13 0.8 

Whittier Narrows Dam 34.03 N (3) 1.9 

(ACOE) 118.05 w 

Crest 033 .21 0.9 

Up .09 

303 .25 1.1 

Los Angeles 34.081N (3) 1.8 130 .17 1.6 

4407 Jasper Street 118.188W Up .10 1 peak 

(USGS) 040 .17 0.5 

24 catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered d·Jring 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude ( s) 

(0) ( s) (.gJ 

4 October 1987 Los Angeles 33.99 N (3) 2.3 010 .24 ('.5 

1059:38.1 G.m.t. Bulk Mail Center 118.16 w Up .08 

Southern Calif. (USGS) 280 .25 [.4 

34.070N, 118.100W 

Magnitude 5.3 ML-- Whittier 33.977N (3) 2.8 

Contjnued 7215 Bright Ave. 118.036W 

USGS) 

Basement 180 .30 r.s 

Up .15 (.7 

090 .33 (.9 

5th Floor 180 .30 c. 7 

Up .28 3.3 

090 .58 3. 4 

lOth Floor 

180 .17 (.5 

Up .53 3 .4 

090 .43 4.3 

Vernon 34.00 N (3) 2.5 007 .15 (.5 

4814 Lorna Vista Ave. 118.20 w Up .07 

(USGS) 277 . 27 (.7 

Los Angeles 34.07 N (3) 2.4 

1111 Sunset Blvd. 118.25 w 

(MWD) 

Basement 348 .08 

Up .05 

258 .08 

4th Floor 348 .11 1 peak 

Up .07 

258 .10 1 peak 

Roof 348 .10 1 peak 

Up .10 1 peak 

258 .08 

Los Angele-s 34.052N 59:41.9 2.9 

1100 Wilshire Blvd. 118. 263W 

(JCG/USGS) 

Basement 3, NE 298 .07 

Up .04 

208 .09 

Basement 3, SE 298 .08 

Up .04 

208 .08 

Basement 4, NW 298 .06 

Up .05 

208 .07 

Table 1 25 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovored during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitu1e (s) 

(0) ( s) (.gJ 

4 October 1987 1100 Wilshire Blvd.--Continued 

1059:38.1 G.m.t. Structure Array: Southern Calif. Ch. 1- 12th Floor, North 298 .09 

34.070N, 118.100W Ch. 2- 12th Floor, North 208 .11 0.3 

Magnitude 5.3 ML-- Ch. 3- 12th Floor, South 208 .08 

Continued Ch. 4- 13th Floor, North 298 .11 1 peak 

Ch. 5- 13th Floor, North 208 .14 0.5 

Ch. 6- 13th Floor, South 208 .08 

Ch. 7- 32nd Floor, North 298 .08 

Ch. 8- 32nd Floor, North 208 .20 2.2 

Ch. 9- 32nd Floor, South 208 .08 

Ch. 10- Ground Floor, North 298 .11 1 peak 

Ch. 11- Ground Floor, North 208 .08 

Ch. 12- Ground Floor, South 208 .10 1 peak 

Los Angeles 34.12 N (3) 2.3 360 .04 

Griffith Park Observ. 118.30 w Up .05 

(USGS) 270 .05 

Norwalk, 12400 33.92 N (3) 0.4 

Imperial Highway 118.07 w 

( USGS/BECH) 

Basement 090 .05 

Up .04 

360 .05 

4th Floor 090 .06 

Up .07 

360 .10 1 peak 

Roof 090 .10 1 peak 

Up .10 1 peak 

360 .08 

South Ground Site 090 .05 

Up .10 1 peak 

360 .06 

Norwalk, 12440 33.92 N 59:42.6 3.4 

Imperial Highway 118.07 w 

( USGS/BECH) 

Basement 090 .05 

Up .05 

360 .04 

North Ground Site 090 .07 

Up .06 

360 .06 

South Ground Site 090 .05 

Up .08 

360 .05 

26 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative Strong .. Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake 

4 October 1987 

1059:38.1 G.m.t. 

Southern Calif. 

34.070N, 118.100W 

Magnitude 5.3 ML--

Continued 

Station name 

(owner} 

Station 

location 

(0) 

Trigger S-minus Direction Maximum Duration 

time trigger (az) amplitude (s) 

Norwalk, 12440--Continued 

Structure Array 1: 

Ch. 1-8th Floor (Roof), Center 

Ch. 2- 5th Floor, Center 

Ch. 3- 2nd Floor, Center 

Ch. 4- 1st Floor, Center 

Ch. 5- Basement, East 

Ch. 6- 5th Floor, West-Center 

Ch. 7- Basement, Center 

Ch. 8- Basement, Center 

Ch. 9- Basement, Center 

Ch. 10- 30 ft. Downhole, Bldg. Center 

Ch. 11- 30 ft. Downhole, Bldg. Center 

Ch. 12- 30 ft. Downhole, Bldg. Center 

Structure Array 2: 

Ch. 13- 8th Floor (Roof), East 

Ch. 14- 5th Floor, East 

Ch. 15- 2nd Floor, East 

Ch. 16- 1st Floor, East 

Ch. 17- 8th Floor (Roof), Center 

Ch. 18- 5th Floor, Center 

Ch. 19- 2nd Floor, Center 

Ch. 20- 1st Floor, Center 

Ch. 21- 8th Floor (Roof), West 

Ch. 22- 5th Fl oar·, West 

Ch. 23- 2nd Floor, West 

Ch. 24- 1st Floor, West 

Orange County Rsvr. 

Abutment 

(MWD) 

33.935N 

117.883W 

Long Beach, CSULB 33.777N 

Humanities Bldg. Bsmt. 118.112W 

(USGS) 

Lawndale 33.895N 

15000 Aviation Blvd. 118.377W 

(USGS} 

Brea Dam 33.889N 

(ACOE} 1'17.926W 

Crest 

Left Abutment 

Downstream 

(3) 

(3) 

(3} 

(3) 

( s) (.g.) 

090 .09 

090 .07 

090 .05 

090 .06 

360 .05 

360 .07 

Up .03 

090 .05 

360 .05 

Up .03 

090 .04 

360 .03 

360 .08 

360 .04 

360 .03 

360 .05 

360 .08 

360 INOP 

360 .05 

360 .07 

360 .09 

360 .05 

360 .04 

360 .J3 

3.6 096 .06 

Up .04 

006 .07 

5.3 104 .06 

Up .03 

076 .04 

3.2 (1) 

4.1 

130 .08 

Up .07 

040 .19 

130 .05 

Up .05 

040 .09 

130 .07 

Up .05 

040 .13 0.3 

Table 1 27 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude (s) (0) ( s) (g.) 

4 October 1987 Carbon Canyon Dam 33.92 N (3) 4.2 

1059:38.1 G.m.t. (ACOE) 117.84 w 

Southern Calif. 

34.070N, 118.100W Crest 130 .06 

Magnitude 5.3 ML-- Up .04 

Continued 040 .07 

Left Abutment 130 .05 

Up .03 

040 .05 

Right Abutment 130 .07 

Up .03 

040 .05 

Weymouth Filter Plant 34.114N (3) (2) 

(MWD) 117.778W 

Bldg., Ground Level (1) 

Water Tank, Top 017 .05 

Up .04 

287 .07 

Diemer Filter Plant 33.91 N (3) 4.3 

(MWD) 117.82 w 

Admin. Bldg. Bsmt. (1) 

Reservoir Roof 281 .04 

Up .05 

191 .06 

Sepulveda VA Hospital 34.249N (3) 5.4 360 .04 

Ground level 118.475W Up .02 

(VA) 270 .06 

Long Beach 33.78 N (3) 5.1 

VA Hospital 118.12 w 

(VA) 

Basement 360 c .06 

Up .03 

270 .05 

6th Floor 360 .09 

Up .05 

270 .10 1 peak 

11th Floor 360 .16 1.7 

Up .07 

270 .17 1.2 

28 Catalogue of u.s. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue 

1987 -Continued 

of National Cooperative Strong-Motion Network accelerograph records recovered c'uring 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude ( s) 

(0) ( s) (g.} 

4 October 1987 Los Angeles 34.050N 59:44.7 5.0 

1059:38.1 G.m.t. Wadsworth VA Hospital 118. 452W 

Southern Calif. (VA/USGS) 

34.070N, 118.100W 

Magnitude 5.3 ML--

Continued 

North Ground Site (1) 

Los Angeles, Brentwood 34.058N (3) 4.0 (1) 

VA Hospital 118.457W 

(VA) 

Sepulveda Dam 34.17 N (3) 5.0 

(ACOE) 118.47 w 

Crest 054 .05 

Up .04 

324 .04 

Downstream 054 .04 

Up .05 

324 .04 

Santa Ana, Orange Cty. 33.75 N (3) (2) (1) 

Engineering Bldg., 117.87 w 

Basement (USGS) 

Jensen Filter Plant 34.309N (3) 6.4 

(MWD) 118.499W 

Administration Bldg. (1) 

Generator Room ( 1) 

Reservoir Roof 022 .05 

Up .02 

292 .07 

Prado Dam 33.89 N (3) 5.6 

(ACOE) 117.64 w 

Downstream 090 .04 

Up .03 

360 .07 

Valyermo Forest Sta. 34.44 N 59:46.2 6.2 (1) 

Ground Level 117.85 w 

(USGS) 

Littlerock Post Office 34.521N (3) (2) (1) Ground Level 117.991W 

(USGS) 

Palmdale Fire Station 34.58 N 59:47.8 6.5 (1) 

Ground Level 118.11 w 

(USGS) 

Table 1 29 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recove"'ed during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximun Duration 

(owner) location time trigger (az) amplitude (s) (0) ( s) (.gJ 

1 October 1987- Los Angeles 34.081N (3) 1.9 130 .09 

4 October 1987 4407 Jasper Street 118.188W Up .04 

Southern Calif. (USGS) 040 .07 

Epicenters and 

magnitudes unknown (3) (2) 130 .07 

Up .06 

040 .09 

(3) 2.1 130 .07 

Up .03 

040 .04 

Note: Three additional records1 recovered at 4407 Jasper Street. 

7 October 1987 Guyot Hills 60.146N 32:15.24 (2) (1) 2032 G.m.t. (USGS) 141.472W 

Alaska 

Epicenter and 

magnitude unknown 

22 October 1987 Livermore 37.625N (3) 2.0 

0348:00.3 GMT VA Hospital 121. 762W 

Central Calif. (VA) 37.805N, 121.743W 

Magnitude 4.4 ML Roof (7th floor) 125 .11 1.1 

Up .02 

035 .17 1.3 

Del Valle Dam 37.615 (3) (2} (COWR) 121.745W 

Toe (1) 

Crest (1) 

Note: Event/record correlation questionable. 

7 November 1987 Bear Valley Station 7 36.483N 06:03.5 1.6 (1) 1506:01.2 G.m.t. Pinnacles National 121.180W 

Central Calif. Monument (USGS) 

36.583N, 121.218W 

Magnitude 4.0 ML Bear Valley Station 10 36.532N 06:03.7 1.7 310 .06 

Webb Residence 121.143W Up .03 

(USGS) 220 .09 

Bear Valley Station 1 36.573N 06:04.2 (2) (1) 

CDF Fire Station 121.184W 

(USGS) 

Bear Valley Station 6 36.504N 06:04.2 2.4 (1} 

James Ranch 121.101W 

(USGS) 

30 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative. Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner} location time trigger (az} amplitude ( s) 

(0} ( s} (.gJ 

7 November 1987 Bear Valley Station 5 36.673N (3) 2.3 (1} 

1506:01.2 G.m. t. Callens Ranch 121.195W 

Central Calif. (USGS} 

36.583N, 121.218W 

Magnitude 4.0 ML--

Continued 

17 November 1987 Sunshine Point 60.180N 48:16.24 (2} (1} 

0846:53.3 G.m.t. (USGS} 142.838W 

Southern Alaska 

47:37.94 58.586N, 143.270W Kayak Island 59.927N 0.4· (1} 

Magnitude 7.0 ML Ridge 144.500W 

(USGS} 

Guyot Hills 60.146N 48:20.94 (2) (1) 

(USGS} 141.471W 

Yakutat 59.51 N (3} (2} (1} 

FAA VOR Building 139.65 w 

(USGS} 

22 November 1987 Eel River Valley Array 40.563N 11:58.2 4.9 360 .05 

0411:52.5 G.m.t. Centerville Naval Fac. 124.348W Up .01 

Northern Calif. (USGS} 270 .03 

40.400N, 124.423W 

Magnitude 3.7 ML Eel River Valley Array 40.58 N 11:58.1 5.5 360 .02 

Ferndale Fire Station 124.26 w Up • 01 

(USGS) 270 .07 

Eel River Valley Array 40.599W (3} (2) (1} 

Fortuna Fire Station 124.154W 

(USGS} 

24 November 1987 Salton Sea 33.18 N 32:52.2 3.0 (1} 

0132:48.0 G.m.t. Wildlife Refuge 115.62 w 

Southern Calif. (USGS) 

33.070N, 115.780W 

Magnitude 4. 2 ML 

24 November 1987 Superstition Mtn. 32.955N (3} 1.6 135 .13 4.8 

0154:14.5 G.m.t. Camera Site 8 115.823W Up .12 1-peak 

Southern Calif. (USGS) 045 .11 2.6 

33.083N, 115.775W 

Magnitude 6.2 Ms Parachute Test Site 32.93 N 54:19.2 3.3 315 .10 2-peaks 

Imler Road 115.70 w Up .10 1-peak 

(USGS) 225 .13 3.3 

Sal ton Sea 33.18 N 54:18.8 2.5 315 .18 2.4 

Vlildlife Refuge 115.62 w Up .20 3.9 

(USGS} 225 .13 0.8 

Table 1 31 
Table 1. Catalogue of National Cooperative Strong-Motion Network acceterograph records recovered during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitud<"! (s) 

(0) ( s) (gJ 

24 November 1987 Imperial Wildlife 33.10 N 54:19.85 5.8 

0154:14.5 G.m.t. Liquefaction Array 115.53 w 

Southern Calif. (USGS) 

33.083N, 115.775W 

Magnitude 6.2 Ms-- Channel 1 - surface 360 .13 1.4 

Continued Channel 2 - surface Up .18 2.7 

Channel 3 - surface 090 .13 0.9 

Channel 4- 7.5 m downhole 360 .08 

Channel 5- 7.5 m downhole Up .09 

Channel 6- 7.5 m downhole 090 .08 

Calipatria 33.13 N (3) 6.0 315 .15 0.6 

Fire Station 115.52 w Up .18 1.6 

(USGS) 225 .22 0.7 

Brawley 32.988N 54:23.8 1.6 315 .06 

Airport Hangar 115.509W Up .04 

(USGS) 225 .06 

Plaster City 32.79 N 54:21.2 4.2 135 .05 

Storehouse 115.86 w Up .03 

(USGS) 045 .04 

Ocotillo Wells 33.14 N 54:22.5 3.7 315 .03 

Burro Bend Cafe 116.13 w Up .04 

(USGS) 225 .03 

El Centro Array 10 32.780N (3) 1.7 230 .04 

Community Hospital 115.567W Up .03 

(USGS) 140 .05 

El Centro Array 9 32.794N (3) 4.7 360 .04 

Commercial Avenue 115.549W Up .03 

(USGS) 270 .05 

El Centro Array 8 32.811N 54:22.9 5.9 230 .06 

Cruickshank Road 115.532W Up .04 

(USGS) 140 .04 

El Centro Array 7 32.829N 54:23.2 5.6 230 .05 

Imp. Valley College 115.504W Up .03 

(USGS) 140 .03 

El Centro Array 6 32.839N 54:23.6 5.5 230 .05 

Huston Road 115 .487W Up .02 

(USGS) 140 .05 

El Centro Array 5 32.855N 54:24.0 5.5 230 .11 1-peak 

James Road 115. 466W Up .02 

(USGS) 140 .08 

El Centro Diff. Array 32.796N 54:23.7 5.5 360 .07 

Dogwood Road 115.535W Up .03 

{USGS) 270 .07 

32 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue 

1987 -Continued 

of National Cooperative Strong-Motion Network accelerograph records recovered during 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger ( az) amplitude ( s) 

(0) ( s) (.g.) 

24 November 1987 El Centro Array 4 32.864N 54:30.9 (2) 230 .03 

0154:14.5 G.m.t. Anderson Road 115.432W Up .02 

Southern Calif. (USGS) 140 .02 

33.083N, 115.775W 

Magnitude 6.2 Ms-- El Centro Array 11 32.752N 54:23.7 5.2 230 .05 

Continued McCabe School 115. 594W Up .03 

(USGS) 140 .04 

El Centro 32.800N 54:23.6 6.7 230 .05 

Meadows Union School 115. 473W Up .02 

(USGS) 140 .05 

El Centro Array 12 32. 718N 54:28.5 1.7 230 .05 

Brockman Road 115.637W Up .01 

(USGS) 140 .04 

Coachella Canal 33.51 N (3) 6.8 135 .04 

Station 3 115.77 w Up .04 

(USGS) 045 .03 

Calexico 32.669N (3) 7.4 315 .04 

Fire Station 115 .492W Up .03 

(USGS) 225 .05 

Coachella Canal 33.56 N (3) (2) 135 .03 

Station 2 115.95 w Up .02 

(USGS) 045 .02 

Bonds Corner (SMA) 32.693N 54:29.7 5.6 230 .09 

Highway 98 at 115 115.338W Up .02 

(USGS) 140 .06 

Bonds Corner (RFT) 32.693N 54:29.7 5.6 230 .09 

Highway 98 at 115 115.338W Up .02 

(USGS) 140 .06 

Coachella Canal 33.64 N (3) 10.0 135 .08 

Station 1 116.08 w Up .05 

(USGS) 045 .08 

24 No~ember 1987 Salton Sea 33.18 N 57:31.9 0.7 315 .19 0.2 

0157 G.m.t. Wildlife Refuge 115.62 w Up .09 

Southern Calif. (USGS) 225 .10 1 peak 

Epicenter and 

magnitude unknown 

24 November 1987 Salton Sea 33.18 N 01:51.3 3.4 (1) 

0201:46.7 G.m.t. Wildlife Refuge 115.62 w 

Southern Calif. (USGS) 

33.070N, 115.790W 

Magnitude 3.8 ML 

Table 1 33 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recove:red during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximu11 Duration 

{owner) location time trigger {az) amplitude {s) 

(0) ( s) (.gJ 

24 November 1987 Salton Sea 33.18 N 15:31.6 (2) (1) 

0215:26 G.m.t. Wildlife Refuge 115.62 w 

Southern Calif. (USGS) 

33.25N, 115.62W 

Magnitude 4.3 MB 

24 November 1987 Salton Sea 33.18 N 18:23.7 0.4 (1) 

0218 G.m.t. Wildlife Refuge 115.62 w 

Southern Calif. {USGS) 

Epicenter and 

magnitude unknown 

24 November 1987 Salton Sea 33.18 N 25:15.0 0.6 (1) 

0225 G.m.t. Wildlife Refuge 115.62 w 

Southern Calif. {USGS) Epicenter and 

magnitude unknown 

24 November 1987 Salton Sea 33.18 N [25:53.2] [1.8] 315 .05 

0225:52.0 G.m.t. Wildlife Refuge 115.62 w Up .03 

Southern Calif. (USGS) 225 .05 

33.080N, 115.780W 

Magnitude 3.5 ML 

24 November 1987 Salton Sea 33.18 N [26:34.5] [1.4] { 1) 

0226 G.m.t. Wildlife Refuge 115.62 w 

Southern Calif. (USGS) 

Epicenter and 

magnitude unknown 

24 November 1987 Salton Sea 33.18 N 49:30.2 0.5 (1) 

0249 G.m.t. Wildlife Refuge 115.62 w 

Southern Calif. (USGS) Epicenter and 

magnitude unknown 

24 November 1987 El Centro 32.93 N 53:04.8 3.2 (1) 

0253:00.7 G.m.t. Parachute Test Site 115.70 w 

Southern Calif. (USGS) 

33.040N, 115.810W 

Magnitude 4.7 ML 

24 November 1987 Salton Sea 33.18 N 21:12.8 0.5 315 .05 

0321:10.3 G.m.t. Wildlife Refuge 115.62 w Up .03 

Southern Calif. (USGS) 225 .04 

33.170N, 115.660W 

Magnitude 3.0 ML 

24 November 1987 Salton Sea 33.18 N 23:26.5 0.2 (1) 

0323:24.7 G.m.t. Wildlife Refuge 115.62 w 

Southern Calif. (USGS) 

33.180N, 115.650W 

Magnitude 3.2 ML 

34 catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner} location time trigger (az} amplitude (s} 

(0} ( s} (.g_} 

24 November 1987 Salton Sea 33.18 N [24:14.7] [1.7] (1} 0324:13.8 G.m.t. Wildlife Refuge 115.62 w 

Southern Ca 1 if. 

33.180N, 115.660W 

Magnitude 3.4 ML 

24 November 1987 Salton Sea 33.18 N 04:37.7 1.1 315 .13 2 ~~aks 

0404:36.8 G.m.t. Wildlife Refuge 115.62 w Up .09 

Southern Calif. (USGS} 225 .12 0.1 

33.180N, 115.650W 

Magnitude 3.6 ML 

24 November 1987 Imperial Wildlife 33.01 N 23:28.8 4.9 (1} 

0623:23.1 G.m.t. Liquefaction Array 115.53 w 

Southern Calif. (USGS) 

33.020N, 115.810W 

Magnitude 4.0 ML 

24 November 1987 Superstition Mountain 32.955N (3} (2} 135 .05 

0155-1315 G.m.t. Camera Site 8 115.823W Up .03 

Southern Calif. (USGS) 045 .03 

Epicenters and 

magnitudes unknown (3} 0.1 135 .12 1 r~ak 

Up .07 

045 .07 

Note: Four additional records1 recovered at Superstition Mountain Camerc 

Site 8. 

24 November 1987 Calipatria 33.13 N (3) 5.0 (1) 

0400-1315 G.m.t. Fire Station 115.52 w 

Southern Calif. (USGS) Epicenter and 

magnitude unknown 

24 November 1987 Superstition Mountain 32.955N 15:57.8 0.1 135 .91 16.5 

1315:56.4 G.m.t. Camera Site 8 115.823W Up .65 16.9 

Southern Calif. (USGS) 045 0 73 15.8 

33.010N, 115.840W 

Magnitude 6.6 Ms Salton Sea, POE 33.097N- 16:00.7 2.6 180 .33 14.8 

Poe Rd. (Temp.) 115.751W Up • 51 17.3 

(CIT) 090 .54 18.-1 

Parachute Test Site 32.93 N 16:01.2 2.5 315 .53 11.3 

Imler Road 115.70 w Up .45 14.5 

(USGS) 225 .49 13.7 

Salton Sea, KNB 33.125N 16:02.6 0.8 180 .19 7.6 

Kornbloom Rd. (Temp.) 115.665W Up .18 1.5 

(CIT) 090 .15 8.8 

Plaster City 32.79 N 16:61 .. 2 3.6 135 .19 10.4 

Storehouse 115.86 w Up .11 1-peak 

(USGS} 045 .15 2.5 

Table 1 35 
Table 1. Catalogue 

1987 -Continued 

of National Cooperative Strong-Motion Network accelerograph records recove·ed during 

Earthquake Station name Station Trigger S-minus Direction Maximun Duration 

(owner) location time trigger (az) amplitude ( s) (0) ( s) (.gJ 

24 November 1987 Ocotillo We 11 s 33.14 N 16:04.0 2.9 315 .11 1-peak 1315:56.4 G.m.t. Burro Bend Cafe 116.13 w Up .09 

Southern Calif. (USGS) 225 .08 

33.010N, 115.840W 

Magnitude 6.6 Ms-- Salton Sea 33.18 N 16:02.6 3.5 315 .15 9.2 

Continued Wildlife Refuge 115.62 w Up .17 12.1 

USGS) 225 .14 11.6 

Imperial Wildlife 33.097N 16:03.45 5.1 

Liquefaction Array 115.530W 

(USGS) 

Channel 1 - surface 360 .21 13.2 

Channel 2 - surface Up .44 10.4 

Channel 3 - surface 090 .19 5.9 

Channe 1 4- 7.5 m downhole 360 .16 1.9 

Channel 5- 7.5 m downhole Up .11 1 peak Channe 1 6- 7.5 m downhole 090 .08 1 peak 

Brawley 32.988N 16:14.1 3.8 315 .15 9.5 

Airport Hangar 115.509W Up .13 3.6 

(USGS) 225 .15 2.4 

Calipatria 33.13 N (3) 5.0 315 .32 10.7 

Fire Station 115.52 w Up .21 10.8 

(USGS) 225 .24 10.8 

El Centro Array 13 32.709N 16:04.7 5.0 230 .19 0.8 

Strobel Residence 115.683W Up .07 

(USGS) 140 .17 0.7 

El Centro Array 10 32. 780N (3) 4.3 230 • 27 7.6 

Community Hospital 115.567W Up .07 

(USGS) 140 .22 9.3 

El Centro Array 11 32.752N 16:04.8 5.8 230 .32 15.7 

McCabe School 115.594W Up .13 6.9 

(USGS) 140 .21 9.4 

El Centro Array 9 32.7 94N (3) 4.6 360 .30 3.6 

Commercial Avenue 115.549W Up .15 2.6 

(USGS) 270 .20 2.8 

El Centro Array 8 32.811N 16:04.9 5.3 230 .35 10.1 

E. Cruickshank Road 115.532W Up . 21 4.9 

(USGS) 140 .33 10.1 

El Centro Array 12 32. 718N (3) 5.4 230 .27 2.0 

Brockman Road 115.637W Up .08 

(USGS) 140 .19 2.0 

Note: Instrument malfunction, partial record (approx. 10 seconds). 

36 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake Station name Station Trigger S~minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude (s) 

(0) ( s) (.gJ 

24 Kovember 1987 El Centro Array 7 32.829N 16:04.7 5.6 230 .20 3.6 

1315:56.4 G.m.t. Imp. Valley College 115 .504W Up .18 0.5 

Southern Calif. (USGS) 140 .26 2.9 

33.010N, 115.840W 

Magnitude 6.6 Ms-- El Centro Diff. Array 32.796N 16:07.2 3.5 360 .29 13.4 

Continued Dogwood Road 115.535W Up .14 3.4 

USGS) 270 .23 11.7 

El Centro Array 6 32.839N 16:04.9 4.2 230 .16 2.4 

Huston Road 115.487W Up .14 2.0 

(USGS) 140 .19 0.7 

El Centro Array 5 32.855N 16:05.5 5.9 230 .19 3.9 

James Road 115.466W Up .11 1-peak 

(USGS) 140 .20 2.6 

E 1 Centro 32.800N 16:05.4 6.2 230 .27 8.7 

Meadows Union School 115.473W Up .12 1-peak 

(USGS) 140 .26 9.3 

El Centro Array 4 32.864N 16:06.6 5.2 230 .10 1-peak 

Anderson Road 115.432W Up .12 1-peak 

(USGS) 140 .11 0.8 

Borrego Springs 33.210N 16:08.1 6.9 315 .06 

Scripps Clinic 116 .330W Up .05 

(USGS) 225 .06 

El Centro Array 3 32.894N 16:06.5 7.1 230 .11 1.8 

Pine Union School 115.380W Up .08 

(USGS) 140 .11 1 peak 

El Centro Array 2 32.916N 16:06.3 6.9 230 .12 0.9 

Keystone Road 115.366W Up .05 

(USGS) 140 .10 1-peak 

El Centro Array 1 32.960N 16:13.5 7.1 230 .09 

Borchard Ranches 115.319W Up .06 

(USGS) 140 .09 

Calexico 32.669N 16:06.5 7.2 315 • 21 10.5 

Fire Station 115.492W Up .10 6.0 

(USGS) 225 .21 11.7 

Co ache 11 a Can a 1 33.51 N (3) 6.1 135 .09 

Station 3 115.77 w Up .05 

(USGS) 045 .08 

Bonds Corner 32.693N 16:08.5 8.2 230 .28 9.9 

Highway 98 at 115 115.338W Up .09 

(USGS) (SMA) 140 .28 9.4 

Bonds Corner 32.693N 16:08.5 8.2 230 .27 9.8 

Highway 98 at 115 115.338W Up .08 

(USGS) (RFT) 140 .29 9.5 

Table 1 37 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovE' .. ed during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger ( az) amplitude ( s) 

(0) ( s) (.gJ 

24 November 1987 Coachella Canal 33.56 N (3) (2) 135 .04 

1315:56.4 G.m.t. Station 2 115.95 w Up .03 

Southern Calif. (USGS) 045 .04 

33.010N, 115.840W 

Magnitude 6.6 Ms-- Rancho de Anza 33.35 N 16:19.1 (2) 135 .06 

Continued Anza-Borrego Park 116.40 w Up .03 

(USGS) 045 .06 

Co ache ll a Canal 33.64 N (3) 9.6 135 .08 

Stat ion 1 116.08 w Up .05 

(USGS) 045 .09 

Terwilliger Valley 33.48 N (3) (2) 135 .02 

Anza Array 116.59 w Up .01 

(USGS) 045 .02 

Chihuahua 33.38 N 16:26.1 (2) 360 .02 

Anza Array 116.68 w Up .01 

(USGS) 270 .03 

Pinyon Flat Observ. 33.61 N 16:24.95 (2) 135 .01 

Anza Array 116.46 w Up .01 

(USGS) 045 .01 

Indio 33.747N 16:16.0 8.4 315 .03 

So. Cal if. Gas Co. 116.214W Up .03 

(USGS) 225 .04 

Tule Canyon 33.47 N (3) (2) 360 .03 

Anza Array 116.64 w Up .02 

(USGS) 270 .02 

Cahuilla Valley 33.512N 16:30.8 (2) 360 .05 

Anza Array 116.798W Up .01 

(USGS) 270 .04 

Garner Valley 33.615N 16:27.5 (2) 360 .02 

Anza Array 116.626W Up .01 

(USGS) 270 .02 

Thousand Palms 33.82 N (3) (2) 135 .02* 

Post Office 116.40 w Up .02* 

(USGS) 045 .03* 

Note: Event/record correlation questionable. 

N. Palm Springs 33.924N 16:20.6 (2) 300 .02 

Post Office 116.543W Up .01 

(USGS} 210 .02 

24 November 1987 Salton Sea 33.18 N 18:11.9 1.0 315 .21 0.5 

1318 G.m.t. Wildlife Refuge 115.62 w Up .18 0.7 

Southern Calif. (USGS) 225 .16 0.3 

Epicenter and 

magnitude unknown 

38 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue 

1987 -Continued 

of National Cooperative Strong-Motion Network accelerograph records recovered during 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger ( az) amplitude ( s) 

(0) ( s) (.g_) 

24 November 1987 Superstition Mountain 32.955N 24:41.7 (2) 135 .11 1 peak 

1324 G.m.t. Camera Site 8 115.823W Up .05 

Southern Calif. (USGS) 045 .05 

Epicenter and 

magnitude unknown 

24 November 1987 Superstition Mountain 32.955N 30:04.3 (2) (1) 

1330 G.m.t. Camera Site 8 115.823W 

Southern Calif. (USGS) Epicenter and 

magnitude unknown 

24 November 198.7 Superstition Mountain 32.955N 33:07.4 (2) 135 .06 

1332:59.8 G.m.t. Camera Site 8 115.823W Up .03 

Southern Calif. (USGS) 045 .06 

32.990N, 115.870W 

records1 Magnitude 4.2 ML Two additional recovered at Superstition Mountain Camera Site 8. 

24 November 1987 Superstition Mountain 32.955N 34:41.8 1.4 135 .12 0.5 

1334:39.9 G.m.t. Camera Site 8 115.823W Up .12 1 J>eak 

Southern Calif. (USGS) 045 .11 1 peak 

32.940N, 115.760W 

Magnitude 4.8 ML El Centro 32.93 N 34:42.4 1.9 315 .16 0.3 

Parachute Test Site 115.70 w Up .08 

(USGS) 225 .09 

Plaster City 32.79 N 34:43.7 2.6 (1) 

Storehouse 115.86 w 

(USGS) 

El Centro Array 8 32.811N 34:45.5 4.4 (1) 

Cruickshank Road 115.532W 

(USGS) 

El Centro Array 7 32.829N 34:45.7 4.5 (1) 

Imp. Valley College 115.504W 

(USGS) 

El Centro Array 11 32.752N 34:45.9 4.3 (1) 

MaCabe School 115.594W 

(USGS) 

Salton Sea 33.18 N 34:46.0 4.5 (1) 

Wildlife Refuge 115.62 w 

(USGS) 

El Centro Array 6 32.839N 34:46.4 4.3 (1) 

Huston Road 115.487W 

(USGS) 

El Centro Array 4 32.86 N 34:46.7 5.3 (1) 

Anderson Road 115.32 w 

(USGS) 

Table 1 39 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recove: .. ed during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximu'TI Duration 

(owner) location time trigger (az) amplitu1e ( s) 

(0) ( s) (g) 

24 November 1987 Imperial Wildlife 33.097N (3) 5.4 (I) 

1334:39.9 G.m.t. Liquefaction Array 115.530W 

Southern Calif. (USGS) 

32.940N, 115.760W 

Magnitude 4.8 ML--

Continued 

24 November 1987- Calipatria 33.13 N (3) 5.4 315 .09 

25 November 1987 Fire Station 115.52 w Up .02 

Southern Calif. (USGS) 225 .03 

Epicenter and 

maynitude unknown Brawley 32.988N, (3) 1.1 315 .08 

Airport Hangar 115.509W Up .02 

(USGS) 225 .09 

24-25 Nov. 1987 Salton Sea, KNB 33.125N (3) 1.7 180 .07 

1316-0230 G.m.t. Kornbloom (Temp.) 115.665W Up .02 

Southern Calif. (CIT) 090 .06 

Epicenters and 

One additional record magnitudes 1 unknown Note: recovered at Salton Sea, KNB. 

24-25 Nov. 1987 Salton Sea, POE 33 .097N (3) 0.7 180 .07 

1316-0346 G.m.t. Poe Road (Temp.) 115.751W Up .05 

Southern Calif. (CIT) 090 .05 

Epicenters and 

magnitudes unknown (3) 3.0 180 .06 

Up .03 

090 .08 

(3) 2.1 180 .05 

Up .02 

090 .04 

(3) 3.1 180 .05 

Up .06 

090 .05 

(3) (2) 180 .06 

Up .01 

090 .06 

(3) 1.8 180 .04 

Up .03 

090 .09 

(3) 1.5 180 .35 0.6 

Up .17 0.3 

090 .14 0.3 

Note: Five additional records1 recovered at Salton Sea, POE. 

40 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovered during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger ( az) amplitude ( s) 

(0) ( s) (.g.) 

25 November 1987 Superstition Hills 33.005N 46:54.54 2.8 (1) 0346:51.7 G.m.t. East (Temp.) 115.729W 

Southern Calif. (USGS) 

33.010N, 115.850W 

Magnitude 3.4 ML 

25 November 1987 Superstition Hills 33.005N 30:20.04 2.4 360 .04 

0430:17.8 G.m.t. East (Temp.) 115.729W Up .03 

Southern Calif. (USGS) 270 .05 

32.980N, 115.820W 

Magnitude 3.4 ML 

25 November 1987 Superstition Hills 33.005N 54:12.14 2.4 360 .09 

1354:09.9 G.m.t. East ( Temp. ) 115.729W Up .11 1 peak 

Southern Calif. (USGS) 270 .14 0.1 

32.980N, 115.820W 

Magnitude 4.2 ML 

25 November 1987 Superstition Hills 33.005N 01:38.94 2.1 (1) 

1501:37.9 G.m.t. East (Temp.) 115. 729W 

Southern Calif. (USGS) 

33.030N, 115.780W 

Magnitude 3.2 ML 

26 November 1987 Superstition Hills 33.005N 56:30.04 2.4 (1) 

0156:27.5 G.m.t. East (Temp.) 115.729W 

Southern Calif. (USGS) 32.~90N, 115.820W 

Magnitude 3.7 ML 

26 November 1987 Superstition Hills 33.005N . 4 39.05.6 3.1 (1) 

1739:01.9 G.m.t. East (Temp.) 115.729W 

Southern Calif. (USGS) 

33.030N, 115.890W 

Magnitude 4.3 ML 

25 November 1987- Superstition Mountain 32.955N (3) 0.5 135 .07 

27 November 1987 Camera Site 8 115.823W Up .04 

Southern Calif. (USGS) 045 .04 

Epicenters and 

magnitudes unknown 0.7 135 .17 0.7 

Up .10 1 peak 

045 .10 1 peak 

Note: Four additional records1 recovered at Superstition Mountain 

Camera Site 8 

27 November 1987 Superstition Hills 33.005N 10:48.64 2.1 360 .06 

0010 G.m.t. East (Temp.) 115.729W Up .02 

Southern Calif. (USGS) 270 .04 

Epicenter and 

magnitude unknown 

Table 1 41 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records rt~covored during 

1987 -Continued 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude ( s) 

(0) ( s) (.g.) 

27 November 1987 Superstition Hills 33.005N 10:12.54 2.2 360 .09 

0110:10.5 G.m.t. East (Temp.) 115.729W Up .07 

Southern Calif. (USGS) 270 .08 

33.000N, 115.820W 

Magnitude 4.7 ML 

27 November 1987 El Centro, Parachute 33.041N . 4 15.49.9 (2) 135 .10 1 peak 

0615 G.m.t. Test Base (Temp.) 116.068W Up .08 

Southern Calif. (USGS) 045 .10 1 peak 

Epicenter and 

magnitude unknown 

27 November 1987 Superstition Mountain 32.955N 22:59.1 1.0 135 .07 

0922:57.6 G.m.t. Camera Site 8 115.823W Up .04 

Southern Calif. (USGS) 045 .04 

33.000N, 115.810W 

22:59.5 Magnitude 4 4.1 ML Superstition Hills 33.005N 2.0 360 .06 

East (Temp.) 115.729W Up .07 

(USGS) 270 .05 

El Centro, Parachute 33.041N . 4 23.04.5 (2) (1) 

Test Base (Temp.} 116. 068W 

(USGS) 

28 November 1987 Superstition Mountain 32.955N 39:11.3 0.8 135 .07 

0039:10.9 G.m.t. Camera Site 8 115.823W Up .06 

Southern Calif. (USGS) 045 .07 

32.980N, 115.810W 

39:12.9 Magnitude 4 4.2 ML Superstition Hills 33.005N 2.2 360 .10 0.2 

East (Temp.) 115.729W Up .09 

(USGS) 270 .12 0.1 

Superstition Mountain 32.960N 39:12.94 (2) 025 .04 

Base (Temp) 115 .816W Up .03 

(USGS) 295 .11 1 peak 

El Centro 32.929N 39:16.1 (2) (1) 

Parachute Test Site 115.700W 

(USGS) 

El Centro, Parachute 32.926N 39:16.24 (2) (1) 

Test Base (Temp.) 115 .695W 

(USGS) 

30 November 1987 Bancas Point 59.953N 24:53.44 (2) 360 .05 

1923:19.5 G.m. t. (USGS) 139.635W Up .02 

Gulf of Alaska 270 .06 

58.679N, 142.786W 

23:30.04 Magnitude 7.1 ML Middleton Island 59.443N (2) {1) 

(USGS) 146.332W 

Mt. Hamil ton 60.337N . 4 24.32.8 (2) (1) 

(USGS) 144.261W 

42 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 
Table 1. Catalogue 

1987 -Continued 

of National Cooperative Strong-Motion Network accelerograph records recovered during 

Earthquake Station name Station Trigger S-minus Direction Maximum Duration 

(owner) location time trigger (az) amplitude ( s) 

(0) ( s) (.g.) 

30 November 1987 Guyot Hills 60.146N 24:31.94 (2) 360 .03 

1923:19.5 G.m.t. (USGS) 141.471W Up .05 

Gu1f of Alaska 270 .06 

58.679N, 142.786W 

23:57.6 Magnitude 4 7.1 ML-- Kayak Island 59.927N (2) (1) 

Continued Ridge 144.500W 

USGS) 

Sunshine Point 60.180N 24:43.64 (2) (1) 

(USGS) 142 .838W 

Yakutat 59.51 N (3) 8.1 360 .12 10 

FAA VOR Building 139.65 w Up .05 

(USGS) 270 .14 10.3 

30 November 1987 Superstition Hills 33.005N 54:50.64 2.2 (1) 

1954 G.m.t. East (Temp.) 115.729W 

Southern Calif. {USGS) 

Epicenter and 

magnitude unknown 

2 December 1987 Superstition Mountain 32.955N 03:07.3 0.5 135 .08 

0403:05.6 G.m.t. Camera Site 8 115.823W Up .05 

Southern Calif. (USGS) 045 .07 

33.126N, 115.830W 

03:08.1 Magnitude 4 4.6 ML Superstition Hills 33.005N 2.3 360N .07 

East (Temp.) 115. 729W Up .06 

(USGS) 270 • 08 

Superstition Mountain 32.960N 03:08.74 (2) 025 .05 

Base (Temp.) 115.816W Up .03 

(USGS) 295 .09 

El Centro, Parachute 32.926N 03:14.14 (2) (1} 

Test Base (Temp.) 115.695W 

(USGS} 

3 December 1987 Superstition Hills 33.005N 45:59.84 (2) (1) 

1345:57.9 G.m.t. East (Temp.) 115. 729W 

Southern Calif. (USGS) 

33.000N, 115.790W 

Magnitude 3.1 HL 

3 December 1987 Superstition Mountain 32.960N 04:40.04 (2) (1) 

1904:36.5 G.m.t. Base (Temp.) 115.816W 

Southern Calif. (USGS) 

33.010N, 115.870W 

Magnitude 3.8 ML Superstition Mountain 32.955W (3) (2) (1) 

Camera Site 8 115.823W 

(USGS) 

Table 1 43 
Table 1. Catalogue of National Cooperative Strong-Motion Network accelerograph records recovmed during 

1987-Continued 

Earthquake 

4 December 1987 

0525 G.m.t. 

Southern Cal if. 

Epicenter and 

magnitude unknown 

10 July 1987-

8 December 1987 

Southern Calif. 

Epicenters and 

Station name 

(owner) 

Superstition Mountain 

Camera Site 8 

(USGS) 

Cabazon 

Post Office 

(USGS) 

magnitudes unknown Whitewater Canyon 

Trout Farm 

(USGS) 

Station 

location 

(0) 

32.955N 

115. 823W 

33.92 N 

116.78 w 

33.99 N 

116.66 w 

Trigger 

time 

25:56.4 

(3) 

(3) 

S-minus Direction 

trigger (az) 

( s) 

(2) 

(2) 

(2) 

Maximum 

amplitude 

(_g.) 

(1) 

( 1) 

( 1) 

Duration 

( s) 

Note: One additional record1 recovered at Whitewater Canyon Trout Farm. 

8 December 1987 Superstition Mountain 32.960N . 4 45.36.6 (2) 

184:>:33.2 G.m.t. Base (Temp.) 115.816W 

Southern Calif (USGS) 

33.000N, 115.860W 

Magnitude 3.4 ML 

2 September 1987- San Diego 32.87 N (3) (2) 

14 December 1987 VA Hospital 117 0 23 w 

Southern Calif. (VA) 

Epicenter and 

magnitude unknown Basement 

15 December 1987 Isabell a Dam 35.647N 23:53.74 (2) 

1823:46.0 G.m.t. (ACOE) 118 .483W 

Central Calif. 

35.370N, 118.770W Main Dam 

Magnitude 4.1 ML Mid-dam 

1 Less than 0.05 ~· 2 Questionable or undeterminable. 

3 WWVB time code illegible, or instrument not equipped with a radio receiver; 

correlation of accelerogram with event may be questionable. 

4 Internal clock time in minutes and seconds after hour listed in column one; 

accuracy is variable. 

44 Catalogue of U.S. Geological Survey Strong-Motion Records, 1987 

( 1) 

(1) 

(1) 


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