~\~:~~;~=.Hii;·?~:~{{::;~:~~·£m: C a ta I o g u e of U . S. G eo I o g 1 c a I S u rv e y 

~{\t){~~~iWl~~~~~t!tlf.J,m!) Strong-Motion Records, 1 9 9 0 
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Catalogue of U.S. Geological Survey 

Strong-Motion Records, 1990 

Compiled by JOSEPHINE C. SWITZER and 

RONALD L. PORCELLA 

U.S. GEOLOGICAL SURVEY CIRCULAR 1093 
U.S. 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: 1992 

Free on application to 

Book and Open-File Report Sales 

U.S. Geological Survey 

Box 25286 

Denver, CO 80225 

Library of Congress Cataloging Card No. 83-600616 
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 until 1973, when the 

U.S. Geological Survey (USGS) assimilated the program into its Earthquake Hazards Reduction Program. The current Federal seismic engineering program operates the National 

Cooperative Strong-Motion Network (NCSMN) with nearly 1,000 stations in 40 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 "Strong-Motion 

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 1990. Unless otherwise noted, event data are from the "Preliminary Determination of Epicenters," published weekly 

by the U.S. Geological Survey. 

Ill 

CONTENTS 

Preface Ill 

Introduction 1 

Reference 1 

TABLE 

1. National Cooperative Strong-Motion Network accelerograph records recovered during 

1990 2 

v 

Catalogue of U.S. Geological Survey 

Strong-Motion Records, 1990 

Compiled by josephine C. Switzer and Ronald L. Porcella 

INTRODUCTION 

During January-December 1990, 266 accelerograph records were recovered from the 

National Cooperative Strong-Motion Network (NCSMN). Eighty of these records are from 

the main shock of the ML = 5.2 Upland, California, earthquake of February 28. A maximum horizontal ground acceleration of 0.58 g was recorded at the crest of San Antonio 

Dam at an epicentral distance of 3 km, and a maximum vertical ground acceleration of 

0.83 g was recorded at the right abutment (Etheredge and others, 1990). A magnitude 4.6 

aftershock on April 17 triggered nine accelerographs at 5 dam or reservoir facilities in the 

main shock epicentral region. At San Antonio Dam (epicentral distance approx. 7 km) peak 

horizontal accelerations of 0.36 g, 0.14 g, and 0.33 g were recorded at the crest, right 

abutment, and downstream stations, respectively. 

Additional magnitude 5 or greater earthquakes recorded at NCSMN stations in 1990, 

including the date, location, magnitude, and number of records recovered, are as follows: 

January 15, Montgomery Pass, Nevada, M=5.0, one record; January 16, northern California, M=5.3, two records; April 18, Hollister/Morgan Hill, California region, M=5.4, five 

records; and, October 24, eastern California, M=5.7, eight records. 

Five accelerograph records were recovered from the Big Island of Hawaii during a 

magnitude 4. 7 event on August 2. Maximum recorded horizontal ground motion was 0.38 

gat Waimea. 

REFERENCE 

Etheredge, E.C., Acosta, A.V., Foote, L.J., Johnson, D.A., Maley, R.P., Porcella, R.L., and Switzer, 

J.C., 1990, Strong-motion recordings from the ML =5.5 Upland, California, earthquake of February 28, 1990: U.S. Geological Survey Open-File Report 90-311, 100 p. 

Manuscript approved for publication August 3, 1992 

1 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990 

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

Transportaiton; MWD, Metropolitan Water District of Southern Calif.; OWNR, Owner of building; USGS, U.S. Geological Survey; 

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

S-minus trigger denotes ~-wave-arrival-minus-trigger-time ~-!)or ~-wave-minus-.f-wave-arrival time interval. Direction is 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 on one vertical and two horizontal orthogonal components 

unless otherwise noted. Duration is interval between first and last peaks of acceleration greater than 0.10 g. Numbers in 

parentheses refer to footnotes at end of table.] 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

2 January 1990 Anza Array 33.616 50:56.9 1.9 (1) 

0950:53.1 G.m.t. Garner Valley Fire Station 116.627 

Southern Calif. (USGS) 

33.650N, 116.770W 

Magnitude 3.4 ML 

15 January 1990 Montgomery Pass 37.977 (3) (2) 360 .29 1.1 

0529:03.4 G.m.t. Nevada 118.318 Up .16 1.2 

Eastern Calif. (USGS) 270 .29 1.6 

37.988N, 118.210W 

Magnitude 5.0 ML 

16 January 1990 Eel River Valley Array 40.58 (4) (2) (1) 

2008:22.0 G.m. t. Ferndale Fire Station 124.26 

Northern Calif. (USGS) 

40.232N, 124.138W 

Magnitude 5.3 ML Eel River Valley Array 40.599 (3) (2) (1) 

Fortuna Fire Station 124.154 

(USGS) 

30January 1990 Bear Valley Station 5 36.673 07:21.9 (2) (1) 

0507:18.6 G.m.t. Callens Ranch 121.195 

Central Calif. (USGS) 

36.543N, 121.177W 

Magnitude 2.8 ML Bear Valley Station 1 36.573 07:19.4 0.6 (1) 

CDF Fire Station 121.184 

(USGS) 

Bear Valley Station 10 36.532 07:19.8 (2) (1) 

Webb Residence 121.143 

(USGS) 

18 February 1990 Anza Array 33.616 53:04.0 2.4 (1) 

1552:59.9 G.m.t. Gamer Valley Fire Station 116.627 

Southern Calif. (USGS) 

33.510N, 116.450W 

Magnitude 4.1 ML Anza Array 33.578 53:05.6 (2) 360 .03 

Pine Meadow Ranch 116.589 Up .04 

(USGS) 270 .06 

2 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

18 February 1990 Anza Array 33.61 (3) (2) (1) 

1552:59.9 G.m.t. Pinyon Flat Observatory 116.46 

Southern Calif. (USGS) 

33.510N, 116.450W 

Magnitude 4.1 ML Anza Array 33.568 53:02.1 1.2 360 .10 1 peak 

(Continued) Rarick Springs 116.510 Up .05 

(USGS) 270 .13 1.5 

Note: One additional record1 recovered at Rarick Springs. 

Anza Array 33.47 53:06.8 (2) (1) 

TuleCanyon 116.64 

(USGS) 

26 February 1990 Chalfant Valley 37.53 (4) 0.8 (1) 

Approx. 2100 G.m.t. Fire Station 118.37 

Eastern Calif. (USGS) 

Epicenter and 

magnitude unknown 

20 June 1989- Live Oak Reservoir 34.137 (3) 

28 February 1990 LaVerne 117.753 

Southern Calif. (MWD) 

Epicenter and 

magnitude unknown Abutment (1) 

12 January 1990- San Antonio Dam 34.157 (3) (2) 

28 February 1990 Upland 117.676 

Southern Calif. (ACOE) 

Epicenter and 

magnitude unknown Crest (1) 

Right Abutment (1) 

28 February 1990 Chalfant Valley 37.53 (4) (2) (1) 

1307:00.8 G.m.t. Fire Station 118.37 

Eastern Calif. (USGS) 

37 .560N, 118.455W 

Magnitude 3.1 ML 

28 February 1990 San Antonio Dam 34.157 (3) 0.3 

2343:36.6 G.m.t. Upland 117.676 

Southern Calif. (ACOE) 

34.140N, 117.700W 

Magnitude 5.2 ML Crest 090 .46 4.9 

(Upland earthquake) Up .40 4.9 

360 .58 8.0 

3 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. oW) (s) (g) 

28 February 1990 Right Abutment 090 .40 3.4 

2343:36.6 G.m.t. Up .83 3.9 

Southern Calif. 360 .48 4.3 

34.140N, 117.700W 

Magnitude 5.2 ML Downstream 090 .47 4.1 

(Continued) Up .43 4.2 

360 .43 4.7 

Live Oak Reservoir 34.137 (3) 0.4 

LaVerne 117.753 

(MWD) 

Abutment 180 .34 3.2 

Up .24 3.4 

090 .28 3.1 

Structure Array: 

Ch. 1- Center Crest 155 .25 3.2 

Ch. 2- Center Crest Up .28 3.0 

Ch. 3- Center Crest 245 .44 4.0 

Ch. 4- Left Crest 155 .29 3.5 

Ch. 5- Left Crest 245 .53 4.4 

Ch. 6- Left Slope 245 .36 3.6 

Ch. 7- Center Slope 155 .22 2.8 

Ch. 8- Center Slope Up .13 2.3 

Ch. 9- Center Slope 245 .32 3.9 

Ch. 10- Center Toe 155 .18 2.8 

Ch. 11- Center Toe Up .18 2.3 

Ch. 12- Center Toe 245 .19 2.9 

Weymouth Filter Plant 34.114 {3) 0.3 

LaVerne 117.778 

(MWD) 

Bldg., Ground Level 015 .31 3.2 

Up .26 4.4 

285 .23 2.8 

Water Tank, Top 015 .83 8.8 

Up .87 14.7 

285 1.05 10.3 

Note: Peak motions listed for top of Water Tank are approx.; record contains extremely highfrequency accelerations that are not fully discernible . 

. 4 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S.minus Direction Maximum Duration 

(Owner) (Lat. 0 N time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

28 February 1990 Morris Dam 34.173 (3) 2.0 

2343:36.6 G.m.t. (MWD) 117.879 

Southern Calif. 

34.140N, 117.700W Left Abutment 245 .05 

Magnitude 5.2 ML Up .04 

(Continued) 155 .08 

Lytle Creek 34.26 43:41.6 3.2 315 .12 1 peak 

Mann Residence 117.50 Up .07 

(USGS) 225 .11 0.3 

Note: One additional record1 recovered at Lytle Creek. 

Sycamore 34.193 43:43.1 2.3 315 .06 

Forest Station 117.426 Up .03 

(USGS) 225 .04 

Orange County Reservoir 33.936 (3) 3.2 

(MWD) 117.884 

Abutment 090 .09 

Up .05 

360 .10 0.6 

Crest 090 .17 1.0 

Up .08 

360 .11 1 peak 

Diemer Filter Plant 33.913 (3) 2.7 

Yorba Linda 117.819 

(MWD) 

Reservoir Roof 280 .10 1 peak 

Up .03 

190 .06 

Carbon Canyon Dam 33.914 (3) 3.5 

Brea 117.839 

(ACOE) 

Crest 130 .11 1 peak 

Up .08 

040 .14 0.2 

Left Abutment 130 .06 

Up .05 

040 .05 

5 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

28 February 1990 Prado Dam 33.890 (3) 4.0 

2343:36.6 G.m.t. Corona 117.641 

Southern Calif. (ACOE) 

34.140N, 117.700W 

Magnitude 5.2 ML Crest 090 .08 

(Continued) Up .06 

360 .07 

Left Abutment 090 .03 

Up .04 

360 .05 

Downstream 090 .20 2.2 

Up .11 2 peaks 

360 .11 0.9 

San Bernardino Array 34.235 43:43.1 2.4 360 .06 

Devore Water Department 117.407 Up .04 

(USGS) 270 .07 

Note: One additional record1 recovered at Devore Water Department. 

Paradise Springs Camp 34.40 (3) 2.8 120 .03 

(USGS) 117.80 Up .04 

030 .07 

Riverside 33.968 (3) 2.5 

Santa Ana River Bridge 117.447 

(MWD/USGS) 

North Abutment 165 .08 

Recorder Building Up .05 

075 .06 

Structure Array: 

Ch. 1- North Abutment 345 .02 

Ch. 2- North Abutment Down .02 

Ch. 3- North Abutment 075 .03 

Ch. 4- Mid Span 345 .07 

Ch. 5- Mid Span Down .05 

Ch. 6- Mid Span 075 .06 

Ch. 7- Below Isolator Bearing 345 .09 

Ch. 8- Below Isolator Bearing Down .02 

Ch. 9- Below Isolator Bearing 075 .03 

Ch. 10- Above Isolator Bearing 345 .07 

Ch. 11- Above Isolator Bearing Down .03 

Ch. 12- Above Isolator Bearing 075 .08 

6 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

28 February 1990 San Bernardino Array 34.134 (3) 3.3 360 .07 

2343:36.6 G.m.t. Rialto Fire Station 117.368 Up .05 

Southern Calif. (USGS) 270 .06 

34.140N, 117.700W 

One additional record1 Magnitude 5.2 ML Note: recovered at Rialto Fire Station. 

(Continued) 

Whittier Narrows Dam 34.020 (3) 4.5 

Pico Rivera 118.053 

(ACOE) 

Crest 120 .05 

Up .05 

030 .05 

Upstream (1) 

Brea Dam 33.890 (3) 4.3 

Fullerton 117.925 

(ACOE) 

Crest 130 .08 

Up .04 

040 .09 

Left Abutment 130 .06 

Up .02 

040 .04 

Downstream 130 .06 

Up .04 

040 .06 

Note: One additional record1 recovered at Brea Dam Crest. 

Whittier 33.977 (3) (2) 

7215 Bright Ave. 118.036 

(USGS) 

Basement (1) 

5th floor Inoperative 

10th Floor (1) 

Valyermo Forest Station 34.44 (3) 4.9 300 .07 

Ground Level 117.85 Up .04 

(USGS) 210 .06 

7 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger 5-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

28 February 1990 San Bernardino Array 34.086 (3} 5.1 360 .05 

2343:36.6 G.m.t. S.B. Valley College 117.309 Up .05 

Southern Calif. (USGS) 270 .05 

34.140N, 117.700W 

Magnitude 5.2 ML Colton Interchange 34.064 (3} 4.7 

(Continued) 1-10/215 117.297 

(CDOT) 

Ground Site 080 .07 

Up .03 

350 .07 

Bridge Cell 080 .25 4.7 

Up .06 

350 .07 

San Bernardino Array 34.183 43:48.6 (2) (1) 

'F' Street 117.295 

(USGS) 

San Bernardino 34.106 43:44.6 4.1 

County Government Center 117.287 

(USGS) 

Basement, SW · (1) 

Ground Site (1) 

Structure Array: 

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

Ch. 2- 2nd Floor Level, NE 090 .04 

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

Ch. 4- 2nd Floor Level, SW 090 .05 

Ch. 5-4th Floor Level, SW 090 .05 

Ch. 6-4th Floor Level, NW 360 .07 

Ch. 7-6th Floor Level, (Roof) NE 090 .09 

Ch. 8- 6th Floor Level, (Roof) NW 360 .09 

Ch. 9- 6th Floor Level, (Roof) SW 090 .08 

Ch. 10- 6th Floor Level, (Roof) NE 360 .07 

Ch. 11- 4th Floor Level, NE 090 .07 

Ch. 12- 4th Floor Level, NE 360 .05 

Lake Mathews 33.852 (3) 2.2 252 .05 

Dike Toe 117.451 Up .04 

(MWD) 162 .06 

8 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

28 February 1990 Garvey Reservoir 34.050 (3) (2) 

2343:36.6 G.m.t. Monterey Park 118.114 

Southern Calif. (MWD) 

34.140N, 117.700W 

Magnitude 5.2 ML Abutment Bldg. (1) 

(Continued) 

Crest (1) 

Pasadena, CIT 34.137 (3) 4.3 360 .05 

525 S. Wilson Ave. 118.127 Up .02 

(USGS) 270 .03 

Norwalk 33.916 (3) 2.2 

12400 Imperial Highway 118.067 

(USGS/BECH) 

North Ground Site (1) 

South Ground Site (1) 

Basement (1) 

4th Floor (1) 

8th Floor 090 .06 

Up .03 

360 .06 

Norwalk 33.917 43:51.1 1.4 

12440 Imperial Highway 118.066 

(USGS/BECH) 

North Ground Site (1) 

South Ground Site (1) 

Basement (1) 

Structure Array 1: 

Ch. 1-9th Level (Roof), Bldg. Center 090 .05 

Ch. 2-6th Level, Bldg. Center 090 .02 

Ch. 3- 3rd Level, Bldg. Center 090 .02 

Ch. 4- 2nd Level, Bldg. Center 090 .02 

Ch. 5- 1st Level (Basement), East End 180 .03 

Ch. 6-6th Level, Bldg. West-Center 180 .04 

Ch. 7- 1st Level (Basement), Bldg. Center Up .01 

Ch. 8- 1st Level (Basement), Bldg. Center 090 .02 

Ch. 9- 1st level (Basement), Bldg. Center 180 .03 

Ch. 10- Downhole (30'), Bldg. Center Up .01 

Ch. 11- Downhole (30'), Bldg. Center 090 .01 

Ch. 12- Downhole (30'), Bldg. Center 180 .03 

9 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

28 February 1990 Structure Array 2: 

2343:36.6 G.m.t. Ch. 13- 9th Level (Roof), East End 180 .06 

Southern Calif. Ch. 14- 6th Level, East End 180 .03 

34.140N, 117.700W Ch. 15- 3rd Level, East End 180 .03 

Magnitude 5.2 ML Ch. 16- 2nd Level, East End 180 .03 

(Continued) Ch. 17- 9th Level (Roof), Bldg. Center 180 .06 

Ch. 18- 6th Level, Bldg. Center 180 .04 

Ch. 19- 3rd Level, Bldg. Center 180 .04 

Ch. 20- 2nd Level, Bldg. Center 180 .03 

Ch. 21- 9th Level (Roof), West End 180 .06 

Ch. 22- 6th Level, West End 180 .03 

Ch. 23- 3rd Level, West End 180 .02 

Ch. 24- 2nd Level, West End 180 .03 

Lorna Linda Medical Center 34.050 (3) 5.3 (1) 

Basement 117.263 

(USGS) 

Alhambra 34.085 43:45.4 5.0 

900 S. Fremont Ave. 118.149 

(USGS) 

Structure Array: 

Ch. 1- 12th Floor, Center 360 .04 

Ch. 2- 12th Floor, Center 090 .03 

Ch. 3- 12th Floor, North End 090 .02 

Ch. 4-6th Floor, Center 090 .03 

Ch. 5- 6th Floor, Center 360 .02 

Ch. 6-6th Floor, North End 090 .02 

Ch. 7- 2nd Floor, Center 090 .06 

Ch. 8- 2nd Floor, Center 360 .03 

Ch. 9- 2nd Floor, North End 090 .05 

Ch. 10- Basement, Center 360 .02 

Ch. 11- Basement, Center Up .02 

Ch. 12- Basement, Center 090 .03 

Lorna Linda VA Hospital 34.050 (3) 5.6 

(VA/USGS) 117.249 

Building 1 Structure Array: 

Ch. 1- Ground Floor, Center Down .02 

Ch. 2- Ground Floor, Center 180 .04 

Ch. 3- Ground Froor, Center 270 .06 

Ch. 4- 4th Floor, Center 270 .15 1.0 

Ch. 5- Ground Floor, North 270 .07 

Ch. 6- 4th Floor, Center 180 .11 1 peak 

Ch. 7- 4th Floor, North 270 .12 1.0 

Ch. 8- Ground Floor, South 180 .04 

Ch. 9- 4th Floor, South 270 .11 0.2 

10 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

28 February 1990 North Ground Site (3) 5.8 360 .05 

2343:36.6 G.m.t. Up .04 

Southern Calif. 270 .06 

34.140N, 117.700W 

Magnitude 5.2 ML South Ground Site (3) 5.2 360 .06 

(Continued) Up .03 

270 .06 

Alhambra 34.084 (3) 5.4 (1) 

Norwich Ave. 118.159 

(USGS) 

Mills Filter Plant 33.920 (3) 0.6 (1) 

(MWD) 117.320 

Los Angeles 33.996 (3) 1.0 360 .03 

Bulk Mail Center 118.162 Up .02 

(USGS) 270 .06 

Santa Ana, Orange County 33.751 (3) 4.8 (1) 

Engineering Bldg., 117.870 

Basement (USGS) 

Reche Canyon 34.004 (3) 5.2 (1) 

Olive Dell Ranch 117.223 

(USGS) 

Littlerock Post Office 34.521 (3) (2) 300 .09 

(USGS) 117.991 Up .02 

210 .10 1 peak 

Orange County 33.677 (3) 0.4 (1) 

John Wayne Airport 117.869 

(USGS) 

Los Angeles 34.118 (3) 5.1 (1) 

Griffith Park Observatory 118.299 

(USGS) 

Long Beach VA Hospital 33.778 (3) 0.8 

(VA) 118.118 

Ground Site (1) 

Basement (1) 

6th Floor (1) 

11th Floor 360 .04 

Up .03 

270 .07 

11 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger 5-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

28 February 1990 San Joaquin Reservoir 33.620 (3) (2) 

2343:36.6 G.m.t. (MWD) 117.842 

Southern Calif. 

34.140N, 117.700W Abutment (1) 

Magnitude 5.2 ML 

(Continued) Crest (1) 

Newport Beach 33.618 (3) 5.8 

840 Newport Center Dr. 117.878 

(USGS) 

Structure Array: 

Ch. 1- Tower 2, Level 1, Center 360 .05 

Ch. 2- Tower 2, Level 1, Center Up .02 

Ch. 3- Tower 2, Level 1, Center 090 .03 

Ch. 4- Tower 2- Level 2, West 360 Inoperative 

Ch. 5- Tower 2:- Level 2, Center 360 .07 

Ch. 6- Tower 2, Level 2, Center 090 .07 

Ch. 7- Tower 2, Level 9, South 090 .02 

Ch. 8- Tower 2, Level 10, Center 360 Inoperative 

Ch. 9- Tower 2, Level 10, Center 090 Inoperative 

Ch. 10- Tower 1, Level 9, East 360 .02 

Ch. 11- Tower 1, Level 10, Center 270 .05 

Ch. 12- Tower 1, Level 10, Center 360 .04 

Palos Verdes Reservoir 33.772 (3) (2) 

(MWD) 118.319 

Crest (1) 

Abutment (1) 

Sepulveda 34.249 (3) 7.8 (1) 

VA Hospital 118.478 

(VA) 

Jensen Filter Plant 34.312 (3) (2) 

Balboa Park 118.496 

(MWD) 

Administration Bldg. 

Basement (1) 

Generator Room (1) 

Reservoir Roof (1) 

Leona Valley Fire Station 34.62 (3) (2) (1) 

(USGS) 118.29 

12 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-rninus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

28 February 1990 Anza Array 33.630 44:06.7 (2) (1) 

2343:36.6 G.m.t. Red Mountain 116.847 

Southern Calif. (USGS) 

34.140N, 117.700W 

Magnitude 5.2 ML 

(Continued) 

28 February 1990- Weymouth Filter Plant 34.114 (3) 

1 March 1990 LaVerne 117.778 

Southern Calif. (MWD) 

Epicenters and 

magnitudes unknown Bldg., Ground Level 1.2 015 .07 

(aftershock) Up .03 

285 .06 

1.4 015 .07 

Up .03 

285 .05 

Note: Two additional records1 recovered at Weymouth Filter Plant Bldg., ground level. 

28 February 199Q- Live Oak Reservoir 34.137 (3) 

2 March 1990 LaVerne 117.753 

Southern Calif. (MWD) 

Epicenters and 

magnitudes unknown Abutment 1.1 180 .08 

(aftershocks) Up .06 

090 .08 

(2) 180 .06 

Up .03 

090 .04 

Note: Four additional records1 recovered at Live Oak Reservoir Abutment. 

Structure Array: (2) 

Ch. 1- Center Crest 155 .05 

Ch. 2- Center Crest Up .03 

Ch. 3- Center Crest 245 .03 

Ch. 4- Left Crest 155 .06 

Ch. 5- Left Crest 245 .03 

Ch. 6- Left Slope 245 .03 

Ch. 7- Center Slope 155 .04 

Ch. 8- Center Slope Up .01 

Ch. 9- Center Slope 245 .03 

Ch. 10- Center Toe 155 .04 

Ch. 11- Center Toe Up .02 

Ch. 12- Center Toe 245 .02 

13 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum 

(Owner) (lat. oN time trigger (az) amplitude 

Long. 0 W) (s) (g) 

28 February 1990- Structure Array: (2) 

2 March 1990 Ch. 1- Center Crest 155 .09 

Southern Calif. Ch. 2- Center Crest Up .05 

Epicenters and Ch. 3- Center Crest 245 .07 

magnitudes unknown Ch. 4- Left Crest 155 .09 

(aftershocks continued) Ch. 5- Left Crest 245 .07 

Ch. 6- Left Slope 245 .OS 

Ch. 7- Center Slope 155 .07 

Ch. 8- Center Slope Up .02 

Ch. 9- Center Slope 245 .06 

Ch. 10- Center Toe 155 .07 

Ch. 11- Center Toe Up .02 

Ch. 12- Center Toe 245 .05 

Structure Array: (2) 

Ch. 1- Center Crest 155 .07 

Ch. 2- Center Crest Up .06 

Ch. 3- Center Crest 245 .05 

Ch. 4- Left Crest 155 .06 

Ch. 5- Left Crest 245 .05 

Ch. 6- Left Slope 245 .04 

Ch. 7- Center Slope 155 .06 

Ch. 8- Center Slope Up .05 

Ch. 9- Center Slope 245 .04 

Ch. 10- Center Toe 155 .05 

Ch. 11- Center Toe Up .03 

Ch. 12- Center Toe 245 .03 

Note: One additional record1 recovered at Live Oak Reservoir Structure Array. 

San Antonio Dam 

Upland 

(ACOE) 

Crest 

34.157 

117.676 

14 

(3) 

(2) 

0.7 

1.3 

(2) 

090 .04 

Up .03 

360 .06 

090 .07 

Up .04 

360 .06 

090 .04 

Up .02 

360 .09 

090 .05 

Up .03 

360 .09 

Duration. 

(s) 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

28 February 1990- Crest (Continued) 0.8 090 .07 

2 March 1990 Up .06 

Southern Calif. 360 .12 2 peaks 

Epicenters and 

magnitudes unknown 1.4 090 .22 0.6 

(aftershocks continued) Up .04 

360 .15 1.6 

(2) 090 .04 

Up .04 

360 .10 0.2 

(2) 090 .04 

Up .04 

360 .11 1 peak 

(2) 090 .07 

Up .03 

360 .09 

0.7 090 .21 0.8 

Up .12 1.1 

360 .43 1.8 

Note: Five additional records1 recovered at San Antonio Dam Crest. 

Right Abutment (2) 090 .04 

Up .06 

360 .05 

1.2 090 .06 

Up .07 

360 .09 

0.6 090 .16 0.5 

Up .18 1.0 

360 .16 1.1 

Note: Fourteen additional records1 recovered at San Antonio Dam Right Abutment. 

Downstream 0.8 090 .06 

Up .04 

360 .08 

1.5 090 .16 0.3 

Up .07 

360 .13 0.4 

15 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

28 February 1990- Downstream (Continued) 0.8 090 .19 0.3 

2 M(!rch 1990 Up .07 

Southern Calif. 360 .18 0.3 

Epicenters and 

Eleven additional records1 magnitudes unknown Note: recovered at San Antonio Dam Downstream. 

(aftershocks continued) 

8 November 1989- Skinner Dam 33.58 (3) (2) 

8 March 1990 (MWD) 117.07 

Southern Calif. 

Epicenter and Left Abutment 180 .04 

magnitude unknown Up .01 

090 .07 

26 March 1990 Bear Valley Station 10 36.532 28:48.6 1.3 310 .07 

1228:47.2 G.m.t. Webb Residence 121.143 Up .05 

Central Calif. (USGS) 220 .07 

36.568N, 121.198W 

Magnitude 2.8 ML 

9 April 1990 Chalfant Valley 37.53 (4) 1.6 (1) 

Approx. 1600 G.m.t. Fire Station 118.37 

Eastern Calif. (USGS) 

Epicenter and 

magnitude unknown 

11 April 1990 Chalfant Valley 37.53 (4) 0.7 (1) 

Approx. 1200 G.m.t. Fire Station 118.37 

Eastern Calif. (USGS) 

Epicenter and 

magnitude unknown 

2 March 1990- San Antonio Dam 34.157 (3) 

17 April 1990 Upland 117.676 

Southern Calif. (ACOE) 

Epicenters and 

magnitudes unknown Crest (2) 090 .03 

Up .05 

360 .05 

0.9 090 .08 

Up .07 

360 .16 0.6 

0.9 090 .02 

Up .04 

360 .08 

16 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station N arne Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

2 March 1990- Crest (Continued) (2) 090 .05 

17 April1990 Up .04 

Southern Calif. 360 .08 

Epicenters and 

Note: Four additional records1 magnitudes unknown recovered at San Antonio Dam Crest. 

(Continued) 

Right Abutment (2) 090 .04 

Up .07 

360 .05 

Note: Eight additional records1 recovered at San Antonio Dam Right Abutment. 

Downstream (2) 090 .02 

Up .06 

360 .02 

0.8 090 .09 

Up .05 

360 .08 

Note: Five additional records1 recovered at San Antonio Dam Downstream. 

17 April 1990 Carbon Canyon Dam 33.914 (3) 3.3 

2232:27.2 G.m.t. Brea 117.839 

Southern Calif. (ACOE) 

34.110N, 117.720W 

Magnitude 4.6 ML Crest (1) 

(aftershock) 

Diemer Filter Plant 33.913 (3) (2) 

Yorba Linda 117.819 

(MWD) 

Basement (1) 

Reservoir Roof (1) 

Live Oak Reservoir 34.137 (3) 0.3 

LaVerne 117.753 

(MWD) 

Abutment 180 .11 1 peak 

Up .04 

090 .19 .02 

17 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

17 April 1990 San Antonio Dam 34.157 (3) 1.2 

2232:27.2 G.m.t. Upland 117.676 

Southern Calif. (ACOE) 

34.110N, 117.720W 

Magnitude 4.6 ML Crest 090 .33 0.8 

(aftershock continued) Up .19 0.5 

360 .36 2.5 

Right Abutment 090 .14 0.2 

Up .08 

360 .08 

Downstream 090 .33 0.6 

Up .13 1 peak 

360 .22 0.3 

Weymouth Filter Plant 34.114 (3) 

LaVerne 117.778 

(MWD) 

Ground Level 015 .11 0.2 

Up .12 1 peak 

285 .07 

Tank Top 015 .20 0.7 

Up .22 2.3 

285 .19 2.4 

18 April 1990 Hollister City Hall 36.851 (3) 4.0 (1) 

1353:51.4 G.m.t. Annex Basement 121.402 

Central Calif. (USGS) 

36.917N, 121.675W 

Magnitude 5.4 ML Hollister Airport 36.888 (3) 5.2 (1) 

Differential Array 121.413 

(USGS) 

Anderson Dam 37.166 (3) (2) 

Morgan Hill 121.628 

(USGS) 

Crest 340 .05 

Up .03 

250 .07 

Left Abutment (1) 

Downstream (1) 

18 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger 5-minus Direction Maximum Duration 

(Owner) (Lat. 0 N time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

18 April 1990- San Antonio Dam 34.157 (3) 

20 April 1990 Upland 117.676 

Southern Calif. (ACOE) 

Epicenter and 

magnitude unknown Crest 1.2 090 .04 

Up .02 

360 .06 

Right Abutment (2) (1) 

Downstream (2) (1) 

22 April 1990 Bear Valley Station 10 36.532 02:06.8 1.9 (1) 

1402:04.4 G.m.t. Webb Residence 121.143 

Central Calif. (USGS) 

36.575N, 121.218W 

Magnitude 3.1 ML 

20 October 1989- Calaveras Array 37.927 (3) (2) (1) 

25 April 1990 Pleasant Hill 122.078 

Central Calif. Contra Costa Fire Station #2 

Epicenter and (USGS) 

magnitude unknown 

28 April 1990 Calaveras Array 37.810 (3) 1.8 (1) 

0441:48.0 G.m.t. Danville Fire Station 121.992 

Central Calif. (USGS) 

37.885N, 121.983W 

Magnitude 4.6 ML 

28 April1990 Calaveras Array 37.927 (4) (2) (1) 

0447:41.8 G.m.t. Pleasant Hill 122.078 

Central Calif. Contra Costa Fire Station #2 

37.863N, 122.003W (USGS) 

Magnitude 3.9 ML 

Calaveras Array 37.810 (3) 2.0 360 .05 

Danville Fire Station 121.992 Up .03 

(USGS) 270 .06 

28 April1990 Calaveras Array 37.810 (3) (2) (1) 

0545:04.2 G.m.t. Danville Fire Station 121.992 

Central Calif. (USGS) 

37.870N, 122.018W 

Magnitude 3.4 ML 

19 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. oW) (s) (g) 

21 May 1990 Chalfant Valley 37.53 (4) 0.9 360 .05 

1049:16.7 G.m.t. Fire Station 118.37 Up .04 

Eastern Calif. (USGS) 270 .06 

37.500N, 118.420W 

Magnitude 3.6 ML Chalfant Valley 37.402 (4) 0.6 (1) 

Laws, Calif. 118.346 

(USGS) 

10 January 1989- Los Angeles 34.056 (3) 4.0 

31 May 1990 2055 Avenue of the Stars 118.413 

Southern Calif. (OWNR) 

Epicenters and 

magnitudes unknown Roof (31) 320 .07 

Up .07 

230 .03 

Note: Five additional records1 recovered at 2055 Avenue of the Stars Roof. 

26 August 1985- Los Angeles 43.050 (3) 

31 May 1990 11645 Wilshire Blvd. 118.459 

Southern Calif. (OWNR) 

Epicenters and 

magnitudes unknown 11th Floor 3.1 315 .11 1 peak 

Up .04 

225 .14 1.2 

(2) 315 .08 

Up .03 

225 .07 

17June 1990 Kealakekua 19.523 (4) (2) (1) 

Approx. 1600 G.m.t. Kona Hospital 155.879 

Hawaii (USGS) 

Epicenter and 

magnitude unknown 

18 November 1989- Palo Alto 37.40 (3) (2) 

26June 1990 VA Hospital, Bldg. 1 122.14 

Central Calif. (VA) 

Epicenters and 

magnitudes unknown Basement (1) 

Roof (7th) (1) 

Note: One each additional record1 recovered at Palo Alto VA Hospital Basement and Roof. 

20 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

2 August 1990 Kealakekua, Hawaii 19.523 (4) (2) (1) 

0537:22.6 G.m.t. Kona Hospital 155.879 

Hawaii (USGS) 

19.843N, 155.617W 

Magnitude 4.7 ML Laupahoehoe, Hawaii 19.987 (4) (2) 360 .05 

Post Office 155.236 Up .02 

(USGS) 270 .05 

Kohala, Hawaii 20.230 (4) 5.6 102 .05 

Police Station 155.801 Up .06 

(USGS) 012 .07 

Mauna Kea, Hawaii 19.826 (4) 3.0 270 .09 

U.K. Summit Observatory 155.473 Up .06 

(USGS) 180 .08 

Waimea, Hawaii 20.026 (4) 3.0 360 .38 1.6 

Fire Station 155.664 Up .23 1.9 

(USGS) 270 .33 2.6 

5 August 1990 Anza Array 33.348 27:06.5 (2) 360 .08 

2127:03.7 G.m.t. Rancho de Anza 116.400 Up .06 

Southern Calif. (USGS) 270 .07 

33.320N, 116.410W 

Magnitude 3.6 ML 

20 June 1988- Los Angeles 33.946 (3) 3.6 270 .07 

8 August 1989 6101 W. Century Blvd. 118.391 Up .05 

Southern Calif. 15th floor 180 .03 

Epicenters and (OWNR) 

magnitudes unknown 

Note: Two additional records1 recovered at 6101 W. Century Boulevard . 

Los Angeles 34.061 (3) 1.1 160 . 08 

10660 Wilshire Blvd. 118.434 Up .09 

19th floor 070 .15 1.0 

(OWNR) 

(3) 4.1 160 .10 1 peak 

Up .11 0.1 

070 .23 .07 

Note: Four additional records1 recovered at 10660 Wilshire Boulevard. 

9 August 1990 Hilo, Hawaii 19.731 (4) (2) (1) 

0206:36.1 G.m.t. U.S.D.A. Laboratory 155.100 

Hawaii (USGS) 

l9.340N, 155.114W 

Magnitude 5.0 ML 

21 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (lat. oN time trigger (az) amplitude (s) 

Long. oW) (s) (g) 

20 August 1990 McGee Creek 37.550 (4) (2) (1) 

1410:47.8 G.m.t. Mammoth Lakes 118.811 

Eastern Calif. (USGS) (Triaxial) 

37.492N, 118.842W 

Magnitude 2.6 Ml McGee Creek 37.550 (4) 

Mammoth Lakes 118.811 

(USGS) (Multi-channel) 

166m Downhole (2) (1) 

35m Downhole (2) (1) 

1 mDownhole (2) (1) 

Surface (2) (1) 

22 August 1990 Los Gatos 37.239 (4) (2) (1) 

2124:06.0 G.m.t. Los Altos Rod & Gun Club 122.106 

Central Calif. (USGS) 

37.202N, 122.075W 

Magnitude 3.7 ML 

28 August 1990 McGee Creek 37.550 (4) (2) (1) 

1824:02.3 G.m.t. Mammoth Lakes 118.811 

Eastern Calif. (USGS) (Triaxial) 

37.523N, 118.893W 

Magnitude 3.2 ML McGee Creek 37.550 (4) 

Mammoth Lakes 118.811 

(USGS) (Multi-channel) 

166m Downhole (2) (1) 

35m Downhole (2) (1) 

1 mDownhole (2) (1) 

Surface (2) (1) 

1 September 1990 Waimea, Hawaii 20.026 (4) (2) (1) 

Approx. 2000 G.m.t. Fire Station 155.664 

Hawaii (USGS) 

Epicenter and 

magnitude unknown 

7 September 1990 Bear Valley Station 10 36.532 29:27.4 1.1 (1) 

2329:26.1 G.m.t. Webb Residence 121.143 

Central Calif. (USGS) 

36.563N, 121.190W 

Magnitude 2.5 ML 

22 
Table 1. National Cooperative Strong-:-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake Station Name Coordinates Trigger S-minus Direction Maximum Duration 

(Owner) (Lat. oN time trigger (az) amplitude (s) 

Long. 0 W) (s) (g) 

23 September 1990 Stanford University 37.419 35:50.8 (2) (1) 

1335:47.6 G.m.t. SLAC Test Lab 122.205 

Central Calif. (USGS) 

37.395N, 122.163W 

Magnitude 3.3 ML 

26 September 1990 Stanford University 37.419 53:59.1 (2) 360 .06 

0253:55.8 G.m.t. SLAC Test Lab 122.205 Up .02 

Central Calif. (USGS) 270 .03 

37.380N, 122.182W 

Magnitude 3.6 ML 

24 October 1990 Buchanan Dam 37.217 (4) (2) 

0615:20.7 G.m.t. (ACOE) 119.983 

Eastern Calif. 

38.047N, 119.157W Left Crest (1) 

Magnitude 5.7 ML 

Center Crest (1) 

Lower Tower (1) 

Upper Tower (1) 

Hidden Dam 37.112 (4) (2) 

(ACOE) 119.883 

Downstream (1) 

Right Crest (1) 

Lower Tower (1) 

Upper Tower (1) 

Center Crest (1) 

20 April 1990- San Antonio Dam 34.157 (3) 

15 November 1990 (ACOE) 117.676 

Southern Calif. 

Epicenter and Downstream 1.0 (1) 

magnitude unknown 

Right Abutment (2) (1) 

9 September 1989- El Centro 32.796 (3) 0.8 (1) 

10 December 1990 Differential Array 115.535 

Southern Calif. (USGS) 

Epicenter and 

magnitude unknown Calexico Fire Station 32.669 (3) 2.6 (1) 

(USGS) 115.492 

23 
Table 1. National Cooperative Strong-Motion Network Accelerograph Records Recovered During 1990-Continued 

Earthquake 

23 May 1990-

Station Name 

(Owner) 

Salton Sea Wildlife Refuge 

(USGS) SMA-1 

Coordinates Trigger 

(Lat. o N time 

Long. 0 W) 

33.178 

115.615 

(3) 

S-minus Direction 

trigger (az) 

(s) 

1.3 

Maximum 

amplitude 

(g) 

(1) 

Duration 

(s) 

12 December 1990 

Southern Calif. 

Epicenters and 

magnitudes unknown Note: Three additional records1 recovered at Salton Sea Wildlife Refuge SMA-1. 

1 Less than 0.05 g at ground-level or less than 0.10 g at non-ground-level stations. 

2 Questionable or indeterminable. 

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

with event may be questionable or identity of event unknown. 

4 Contains internal clock for event correlation only (accuracy is widely variable). 

24 
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