Seismic engineering program report, January-April 1980

BASEMENT

GEOLcx;ICAl SURVEY CIRCULAR 854-A EARTHQUAKE OF JANUARY 24 Magnitude 5.5 Seismic Engineering Program Report January - April 1980

GEOLOGICAL SURVEY CIRCULAR 854-A

Prepared on behalf of the National Science Foundation Grant CA-114

JAMES G. WATT, Secretary

PREFACE

This Seismic Engineering Program Report is an informal periodical primarily intended to keep the ever-growing i nternat ion a 1 community of strong-motion data users apprised of the nature and availability of data recovered by the Seismic Engineering Branch of the U.S. Geological Survey (USGS). Strong-Motion Program is administered by the USGS and supported by the National Science Foundation (Grant CA-114) in cooperation with numerous Federal, State, and local agencies and organizations. Major objectives of the program include recording both strong ground motion and the response of various types of engineered structures during potentially damaging earthquakes and disseminating this strong-motion information and data to the earthquake engineering research and design community.

This issue contains a summary of the accelerograms recovered from the USGS National Strong-Motion Network during the period January 1 through April 30, 1980. Reproductions of some of the significant accelerograms from the Livermore Valley earthquakes of January 24 and 26 and the southern California (Horse Canyon) earthquake of February 25 are included along with summaries of recent strong-motion reports, notes on the availability of digitized data, and additional general information pertinent strong-motion programs. The data summary included in table l contains information on those accelerograms recovered (although not necessarily recorded) during the period January-April 1980; this procedure has been adopted so that the dissemination of strong-motion information may be as expeditious and current as practicable.

iii

to the USGS and to other

Ronald L. Porcella/ Editor U.S. Geological Survey/ Mail Stop 78 Menlo Park/ California 94025

DEL VALLE DAM CREST

Figure 2- Accelerograms from the January 24, 1980 Livermore, California earthquake; component label indicates direction of ground acceleration for upward trace deflection on accelerogram. See table l for peak acceleration values.

Figure 2- Accelerograms from the January 24, 1980 Livermore, California

S-Wave arrival time

earthquake; component label indicates direction of ground acceleration for upward trace deflection on accelerogram. See table l for peak acceleration values.

Tab 1e 2 - Strong-motion stations (epicentral distance less than 50 km) that

Station (owner/code)

San Ramon (CDMG/134)

Antioch (CDMG/70)

Walnut Creek (CDMG/364)

VA Hospital, Bsmt (USGS/1226)

De 1 Va 11 e Dam, Toe (USGS/1265)

Pleasant Hill (CDMG/348)

Hayward (CDMG/354)

Hayward (CDMG/219)

Oakland (CDMG/225)

Fremont (CDMG/64)

Oakland (CDMG/359)

1 Epicenter located at 37.84° N, 121.80° w. 2 Peak ground acceleration. 3 Epicenter located at 37.76° N, 121.70° w. recorded both the January 24 and January 26 Livermore earthquakes (CDMG station data from McJunkin and Ragsdale, 1980)

Epic. dist. 1 Horiz. PGA2 January 24 Magnitude 5.5

(km)

0.15 (_g)

.02 January 26 Magnitude 5.8

Epic. dist.3 Horiz. PGA (km)

0.28 (_g)

UP

Figure 3- Accelerograms from the January 26, 1980 Livermore aftershock; peak

DEl VAllE DAM CREST

accelerations are listed in table 1.

TERWILLIGER VALLEY

Figure 4 - Accelerograms from the February 25, 1980, Anza, California earthquake; peak accelerations are listed in table 1.

S-·Wave arrival time

Figure 4 - continued.

SUMMARY OF RECENT EFFECTIVE-NESS IN MAINTENANCE OF THE USGS STRONG-MOTION NElWORK SUMMARIES OF RECENT STRONG-MOTION REPORTS*

STRONG-MOTION ACCELEROGRAMS OF THE OROVILLE, CALIFORNIA, AFTERSHOCKS: DATA PROCESSING AND THE AFTERSHOCK OF 0350 AUGUST 6, 1975

by Jon B. Fletcher, A. Gerald Brady,

Reference: Bulletin of the Seismological Soci-

• Inclusion sources is intended as a service to our readers and does not imply endorsement of these reports by the U.S. Geological Survey. ety of America, v. 70, no. 1, p. 243-267.

and Thomas C. Hanks

The result is an accurate

of strong-motion small S-wave minus

Accelerograms.

All of the accelero-

THE ROLE OF ANELASTICITY IN EARTHQUAKE

A vertical seismic array at the Richmond Field Station has provided some excellent experimental data showing the effects of unconsolidated sediments on ground motion during local earthquakes. controlled in that good estimates of the material properties of the sediments are available; the largest uncertainty is in the attenuation. Three components of acceleration have been recorded in bedrock below the sediments, within the sediments, and at the surface of the sediments from two local earthquakes. The maximum accelerations at the surface are between 1.5 and 4.3 times those in the bedrock.

Analytical calculations that assume vertically propagating waves and that are suitable for reasonably well the differences between the bedrock records and . the surface records for both vertical and horizontal components. Maximum accelerations, duration, frequency content, genera 1 character of the records, and response spectra are all in agreement. energy arriving late in the records can best be exp 1a.i ned horizontally in the sediments.

Reference: U.S. Geological Survey Open-File

SPECTRA OF AMPLITUDES SUSTAINED FOR A GIVEN NUMBER OF CYCLES: AN INTER-PRETATION OF THE RESPONSE DURATION FOR STRONG-MOTION EARTHQUAKE RECORDS

To answer the quest ion, amplitude is sustained for a duration equal to a specified number of cycles? , a technique was developed using the response of a single-degreeof-freedom, lightly damped oscillator to generate a spectrum of amplitudes that corresponds to a specific number of cycles. This technique provides a simple approach by which to compare the amplitude sustained for given numbers of cycles as a percentage of the maximum response.

The response as a function of time may consist of one or a very few oscillations of high amplitude followed by many oscillations of lower amplitude. An effective response defined in terms of the amplitude sustained for a chosen number of cycles might indicate the severity of the response to a particular earthquake. grams indicate that for oscillators with 5 percent damping and with periods in the range 0.04 to 4 seconds, the mean effeotive response .. for by T. V. McEvilly and L. R. Johnson

Report 80-912, 37 p.

Preliminary analyses of 12 accelero-

GROUND MOTION

The experiments are well

by Virgilio Perez materials

EL CENTRO, CALIFORNIA DIFFERENTIAL GROUND MOTION ARRAY SELECTED PAPERS ON THE IMPERIAL VALLEY,

OCTOBER 15, 1979 MAINSHOCK STRONG-MOTION RECORDS FROM THE MELOLAND ROAD-INTERSTATE ROUTE 8 OVERCROSSING, IMPERIAL COUNTY, CALIFORNIA

THE IMPERIAL COUNTY SERVICES BUILDING, AN ANALYSIS OF STRONG-MOTION DATA FROM A SEVERELY DAMAGED STRUCTURE, CALIFORNIA, EARTHQUAKE OF OCTOBER 15 I 1979

EL CENTRO, CALIFORNIA PEAK HORIZONTAL ACCELERATION AND VELOCITY FROM STRONG-MOTION RECORDS INCLUDING RECORDS FROM THE 1979 IMPERIAL VALLEY, CALIFORNIA, EARTHQUAKE STRONG-MOTION RECORDS FROM THE LIVERMORE EARTHQUAKES OF JANUARY 24 AND 26, 1980

U.S. STRONG-MOTION NElWORK DATA

above, but replace yourname name. characters followed by one space; your name is typed as one continuous character string and followed by one space; and SMIRS is five uppercase characters. Type the carriage-return key and then the line-feed key; then you will be given instructions.

The strong-motion records from the February 9, 1971 San Fernando, California, earthquake and most of the significant records prior to that event have been digitized by the California Institute of Technology (CIT) (Hudson, 1976). have been presented in a series of reports containing (l) uncorrected digital data, (2) corrected accelerations, velocities, and displacements, (3) response spectra, and (4) Fourier amplitude spectra. All of these data reports are available through the National Technical Information Service (NTIS, see Data Sources, this report).

The digitization and records collected by the State of California Strong-Motion Instrumentation Program are being handled by the Off ice of Strong-Mot ion Studies (OSMS), Geology. analyses will be available from OSMS (see Data Sources, this report).

The digitized data from the CIT digitization program are available from the Environmental Data and Information Service (EDIS) and the National Information Service for Earthquake Engineering at the University of California, Berkeley (NISEE) report). The magnetic tape digital data from subsequent years will be available from EDIS and NISEE at approximately the same time as the data reports are published.

References: Converse, April, 1978, Strong-motion information retrieval system user's manual: U.S. Geological Survey Open-File Report, 79-289, 51 p. Hudson, D. E., 1976, Strong-motion earthquake accelerograms- index volume: Institute of Technology, EERI report 76-02, 72 p.

AND GEOLOGY STRONG-MOTION DATA

Processed strong-motion data from selected earthquakes are available from the California Division of Mines and Geology. The data have been prepared by the interim CDMG strong-motion data composed of a series of programs that have been developed by the California Institute of Technology, the U.S. Geological Survey, and the California Division of Mines and Geology, with The word

Processing and analysis of the data

California Division of Mines and When completed, reports on these

CALIFORNIA DIVISION OF MINES

processing enter is five lowercase

system.

special emphasis on the handling of longduration film records from multiple-channel central recording instruments. The data are grouped by phase:

Phase I Phase II

Phase III Response spectra.

Each phase contains three-channel subgroups arranged by station. At the present time, data from the following processed:

Santa Barbara earthquake of August 13, 1978

UCSB Goleta UCSB North Hall Freitas Building

Imperial Valley earthquake of October 15, 1979

El Centro free-field Imperial County Services Bldg.

The nine-track tapes, along with a microfiche copy of the tape contents. should contact the CDMG Office of Strong-Motion Studies (see Data Sources, this report).

It is the pol icy of the CDMG to make all strong-motion record data promptly available to the public in a manner consistent with good data management. records, personal access to record or data files, and copies of data files should be made to the Studies(OSMS), and should specify identity and medium reviewed. should be specific. When a request for copies of materials or personal access to files is received, OSMS staff will provide the requested material or will set an appointment time for personal review of files; the requestor will be notified immediately of any significant delay or other problems that prevent meeting the request. processing of materials will be based on the actual cost of producing and delivering the items, originals and master copies of all items.

FOREIGN STRONG-MOTION DATA

Because of the long history of close cooperation between the U.S. and the Central and South American strong-motion programs, much of the data from those programs are available from the same sources as the U.S. data (see below). from the Western Hemisphere will be included in the Strong-Motion Information Retrieval System operated by the USGS.

of materials Desired access or delivery dates

Information about strong-motion data Uncorrected accelerations, Corrected velocities, and displacements,

are earthquakes have been

Requests for copies of

of A worldwide collection of strong-motion seismograms for dissemination to the scientific and engineering community is available from World Data Center A for Solid Earth Geophysics ana the Terrestrial Data Center (NGSDC). contributing to the strong-motion data base include Australia, Italy, Japan, New Zealand, Rumania, U.S.S.R., and Yugoslavia. Geological Survey has furnished records from its network of cooperative strong-mot ion stations, including those in Central and South America.

Copies of strong-motion records are available on 35-mm film, on 70-mm film chips, as paper copies, and as digitized data on punched cards or magnetic tape. A list of most records can be obtained from the World Data Center A pub 1icat ion "Cat a log of Seismograms and Strong-Motion Records, Report SE-6." This catalog can be ordered from NGSDC (EDIS/NOAA) for $2.00 (see Data Sources, this report).

Full-size paper copies (12 x 36 inches) are available for many of the events in the United States and Latin America at a cost of $1.50 per record. copies, but at a reduced scale.

Japan and Australia have supplied magnetic tapes of digitized data from stations located in the western Pacific Ocean (the Japanese Islands, New Guinea, and New Britain). series of 400 U.S. {1933-1971) were digitized by the California Institute of Technology and are now available on six magnetic tapes. Survey is digitizing post-1971 records from its network; they have generated five tapes of strong-motion records recorded from 1967 to 1975 in the United States, Chile, Nicaragua, San Salvador, and Mexico.

Other digitized data include punched cards containing strong-motion records from the March 4, 1977 earthquake in Rumania (recorded in Bucharest); the Gazl i earthquake of May 17, 1976, in Uzbek, U.S.S.R.; and three earthquakes in the New Madrid seismic zone (located in midcontinental United States) in 1975 and 1976.

Recent acquisitions include a magnetic tape of strong-motion records triggered by a swarm of earthquakes that occurred in northern Italy near the town of Friuli in 1976; these were

EDIS/NOAA WORLDWIDE STRONG-MOTION DATA

Other records are available as paper Geophysical

The U.S. Geological and Solar-Countries

The U.S.

A records compiled by the National Commission for Nuclear Energy and have been given to the Center for distribution.

records available on magnetic tape may be obtained free of charge from EDIS/NOAA. Digitized strong-motion records may be purchased either in punched card format at $20 per record (including all three instrument components) or in tape format at $60 per tape.

payable should be addressed to EDIS/NOAA (see Data Sources, this report).

strong-motion inquiries to the appropriate agency listed below:

1. Branch of Distribution
2. Earthquake Engineering
3. ED IS/NOAA
4. National Technical
5. NISEE/Computer Applications
6. Office of Strong-Motion
7. Open-file Services Section
8. Seismic Engineering Branch (415) 323-8111

A table listing all digitized strong-motion

Checks or money orders should be made to

U.S~ Geological Survey 604 S Pickett Street Alexandria, VA 22304

Research Institute 2620 Telegraph Avenue Berkeley, CA 94704

Information Service U.S. Dept. of Commerce Springfield, VA 22151

519 Davis Hall, UC Berkeley Berkeley, CA 94720.

Studies California Division of Mines and Geology 2811 "0" Street Sacramento, CA 95816

Box 25425, Federal Center Denver, CO 80225

345 Middlefield Road, MS 78 (FTS) 467-2881 Menlo Park, CA 94025.

"Commerce/NOAA/NGSDC";

DATA SOURCES

or information records and data,

{804) 756-6141 (FTS) 756-6141

{303) 497-6764 (FTS) 320-6764

(703) 487-4650 (FTS) 737-4650

(916) 322-3105 (FTS) 552-3105

{303) 234-5888 (FTS) 234-5888

regarding address Error Reference

CIT; EERL S-M earthquake accelerograms, digitized & plotted data; val II, III, IV; Part B; Record #037 (1966 Parkfield earthquake)

same as above: val I, II; Part C Record #041 {1971 San Fernando earthquake; Component direction-Pacoima Dam accelerogram)

USGS S-M Station No. 1250 Gilroy, Gavilan College (Component direction - all S-M records since Oct. 1972)

USGS S-M Station 2420 New Madrid, Missouri (Component directionevents of 6-13-75 and 3-24-76)

USGS S-M Station no. 181; Los Angeles, 640 Marengo, lst floor (Component direction prior to 7-15-70)

NOTE: Since 7-15-70, the 1st floor (also 4th floor and roof) component directions are:

USGS S-M Station No. 122; Glendale, California {Component direction - events of 4/8/68 and 2/9/71)

USGS S-M Station No. 125{828); Lake Hughes Array Station (lA) Component direction:

ERRATA

Temblor, Calif. No. 2 USGS Station No. 1097 35 45 07 N 120 15 52 w

L - S74W V - Down T - Sl6E

L - S67W V - Down T - Sl3E

L - Sl9W V - Down T - S71E

L - N36W V - Down T - S54W

L - S70E V - Down T - S20W

L - N21E v - Down T - N69W

L - N21E v - Down T - S69E Ternb 1or, Ca 1if. USGS Station No. 1438 35 42 36 N 120 10 12 w

L - N76W V - Down T - S14W

L - S67W V - Down T - S23E

L - West V - Down T - South

L - S54W V - Down T - S36E

L - N36W V - Down T - S54W

L - S72E V - Down T - Nl8E

L - S21W V - Down T - S69E

L - S21W V - Down T - S69E Event

20 October 1979 0625 UTC Central California 36.57N, l2l.21W Magnitude 3.4

4 November 1979 1713 UTC So. California 33.08N, ll5.55W Magnitude 3.6

21 October 1979- 4 January 1980 Central California Epicenters and magnitudes unknown

5 January 1980 2209 UTC Central California Epicenter and magnitude unknown

8 January 1980 1935 UTC Central California Epicenter and magnitude unknown

12 January 1980 2011 UTC So. California 32.90N, ll5.52W Magnitude 4.4

See footnotes at end of table. Stat ion name (owner)l

Bear Valley station 10 36.53° N 1.4 Webb Ranch (USGS)

Note: One additional record recovered at station 10 (event unknown); maximum acceleration less than 0.05 ~·

Bear Valley station 4 Bickmore Canyon (USGS)

Brawley Municipal Airport (USGS)

Bear Valley station 10 Webb Ranch (USGS)

Note: One additional record recovered at station 10; maximum acceleration less than 0.05 ~·

Bear Valley station 10 36.53° N Webb Ranch (USGS)

Bear Valley station lO 36.53° N 1.7 Webb Ranch {USGS)

El Centro array sta. 5 32.86° N 2.6 James Road (USGS)

Brawley Municipal Airport (USGS)

El Centro array sta. 6 32.84° N 2.7 Huston Road (USGS) Station coord.

l.O 36.57° N 121.22° w

32.988° N 115.509° w

36.53° N 121.14 ° w

32.99° N 115.51° w

. 7 Max accl (g)

0.13 315° Up 225°

230° Up 140° **

13 January 1980 2113 UTC So. Cal if orn i a 33.12N, 115. ?OW Magnitude 3.5

13 January 1980- 26 February 1980 So. California Epicenter and magnitude unknown

24 January 1980 1900 UTC Central California 37.85N, l21.82W Magnitude 5.5

27 January 1980 0233 UTC Central California 37.74N, l21.74W Magnitude 5.8

See footnotes at end of table. Station name (owner )1

Calipatria Fire Station (USGS)

Calipatria Fire Station (USGS)

Livermore VA Hosp ita 1, Bldg. 62 121.762° w (VA) t

Roof level (7)

De 1 Valle Dam (CDWR)t

De 1 Va 11 e Dam (CDWR)t

33 013° N 2.8 115.52° w

33 013° N 3.5 115.52° w

37.617° N 3.8 121.746° w

37.617° N 2.7 121.746° w 3 Max accl 4 Duration (g)

0 012 128° Up 038°

2.8 2-peaks 1.4 Event

27 January 1980 0233 UTC (continued}

9 August, 1979- 28 January 1980 Central California Epicenters and magnitudes unknown

23 January 1980- 26 February 1980 So. California Epicenter and magnitude unknown

See footnotes at end of table. Station name (owner )1

Livermore VA H~spital, Bldg. 62 121.762° W (VA)

Note: Two each aftershock records were recovered at Livermore VA

San Francisco VA Hospital (USGS) t

Alameda Fruitvale Ave. Bridge 122.23° W (ACOE) t

Hayward City Hall (USGS)

Note: Three each additional records were recovered at the 6th

Brawley Municipal Airport (USGS) hospital (basement and roof) and Lawrence Livermore Lab (events between 28 January and 22 february); maximum acceleration less than 0.05 ~·

and llth floors; maximum acceleration less than 0.05 ~· S-t2 Direction3 Station coord.

37.78° N 122.50° w

37.77° N 6. l

37.68° N 1.0 122.08° w

32.99° N 1.9 115.51() w Max ace 14

Up 038° Duration (g_)

25 February 1980 1047 UTC So. California 33.52N, 116.55W Magnitude 5.5

See footnotes at end of table. Station name (owner )1

Fun Valley Reservoir 361 (USGS)

Cabazon Post Office (USGS)

North Palm Springs Post Office (USGS)t

Thousand Palms Post Office (USGS)t

Anza Fire Station (USGS)

Indio So. Calif. Gas Co. (USGS)

Pinyon Flat Observ. Underground vault (USGS)

Rancho de Anza Anza-Borrego Park (USGS)

Coache 11 a Can a 1 Station 1 (USGS)

Borrego Air Ranch Borrego Springs (USGS)

Terwilliger Valley Snodgrass Residence (USGS)

33.93° N .3 116.40° w

33.92° N 116.78° w

33.92° N 5.8 116.54° w

33.82° N 4.7 116.40° w

33.75° N 2.5 116.67° w

33.75° N .9 116.21° w

33.61° N 1.8 116.46° w

33.35° N 2.8 116.40° w

33.64° N 6.4 116.08° w

33.19° N 5.7 116.28° w

33.48° N 1.8 116.59° w

34.05° N 7.3 (_g)

0.05 135° Up 045°

135° Up 045° 4 Duration5

0.3 . 13 .07 1-peak .11

25 February 1980 1047 UTC (continued)

27 February 1980 0129 UTC So. Cal if orn i a 32.95N, 115.57W Magnitude 3.6

20 November 1979- 27 February 1980 So. California Epicenters and magnitudes unknown

22 February 1980- 27 February 1980 Central California Epicenter and magnitude unknown

See footnotes at end of table. Station name (owner)1

Hurkey Creek Park (USGS)

Cherry Valley (USGS)

Whitewater Trout Farm (USGS)

Cranston Forest Sta. (USGS)

Brawley Municipal Airport (USGS)

Calipatria Fire Station (USGS)

Lake Mathews Dike toe (MWD)

Diemer Filter Plant (MWD)

Hoover Dam (CDWR)

Note: Four additional records from events during this time period recovered at gallery station; maximum acceleration less than 0.05 R·

Livermore VA Hospital (VA)

33.67° N 3. l 116.68° w

33.98° N 8.5 116.99° w

33.99° N 6.7 116.66° w

33.74° N 4.7 116.84° w

32.99° N 2.8 ll5.5F w

33.10° N 115.52° w

33.85° N 117.45° w

33.91° N .9 117.82° w

36.02° N 114.74° w

37.625° N 121.762° w (g)

0.08 135° Up 045° .09 .11

17 August 1979- 5 March 1980 Central California Epicenters and magnitudes unknown

6 March 1980 1105 UTC Central California 36.67N, l21.37W Magnitude 4.0

28 March 1980 2201 UTC I mper i a l Valley Epicenter and magnitude unknown

l January 1980- 3 April 1980 So. California Epicenters and magnitudes unknown

9 October 1979- 11 Apri 1 1980 So. California Epicenter and magnitude unknown

13 April 1980 0616 UTC Central California 36.72N, 121.55W Magnitude 4. 9

See footnotes at end of table. Station name {owner)l

Bear Valley station 9 Schroll Ranch (USGS)

Note: One additional record recovered at station 9; maximum acceleration less than 0.05 ~·

Bear Valley station 12 36.66° N 2.1 Williams Ranch (USGS}

Note: One aftershock recorded at station 12 on 6 March (1108 UTC);

maximum acceleration less than 0.05 ~·

Bear Valley station 9 Schroll Ranch (USGS)

Calipatria Fire Station (USGS)

Parachute Test Site Imler Road (USGS)

Note: One additional record recovered at Parachute Test Site; maximum acceleration less than .05 ~·

El Centro array sta. 9 32.79° N Commercial Ave. (USGS)

Escondido Power Station (SDGE)

May be related to earthquake of

Hollister City Hall 339 Fifth St. (USGS)t Station coord.

36.63° N 1.5 121.28° W

36.63° N 1.2 121.28° w

33.13° N 1.6 115.52° w

32.93° N 1.3 115.70° lrJ

33.125° N 117.117° w

36.85° N 121.40° w DirectionS Max accl4

25 February 1980, 1047 UTC.

1.4 0.04 030° Up 300° Duration

Central California Epicenters and magnitudes unknown

1Station owner code:

ACOE - U.S. Army Corps of Engineers.

CDWR MWD SDGE USGS VA

S-wave arrival minus trigger time (S- t) interval.

Direction of case acceleration for upward trace deflection on accelerogram. Horizontal components are listed as azimuth in degrees clockwise from north. Vertical components are listed as Up or down.

Peak acceleration recorded at ground level on one vertical and two orthogonal horizontal components. ** Denotes maximum acceleration is less than 0.05 ~ at ground level or less than 0.10 ~at non ground-level stations.

Dos Amigos Pumping Plant (CDWR)

Note: One each additional records recovered at levels l and 4; maximum acceleration less than 0.05 ~· (s)

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