UNITED STATES DEPARTMENT OF THE INTERIOR …implication is that the entire building is accelerating...

UNITED STATES DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY

PROCESSED STRONG-MOTION RECORDSWHITTIER NARROWS, CALIFORNIA EARTHQUAKE

OCTOBER 1, 1987

VOLUME I USGS-NSMIN STATIONS WITHIN 15 KM OF THE EPICENTER

A. G. Brady, p. N. Mork, L. C. Seekins

Open File Report 88-354

Menlo Park, California June 1988

This report is preliminary and has not been reviewed for conformity withUSGS editorial standards. Any use of trade names is for descriptive

purposes only and does not imply endorsement by the USGS.

PREFACE

This report contains the computer processing results of

records from the close-in stations of the U.S. Geological Survey's

National Strong Motion Instrumentation Network during the Whittier

Narrows, California, earthquake, ML*5.9, on October 1, 1987. This

"Executive Summary" report contains computer plots of uncorrected

acceleration (except relatively insignificant codas), corrected

acceleration, velocity and displacements (except relatively

insignificant codas), tripartite response spectra (except the

upper stories of buildings), and Fourier amplitude spectra plotted

on log axes. Subsets of plots excluded from the above list, and

other familiar plots (velocity response spectra on linear axes,

Fourier amplitude spectra on linear axes) are available from the

authors at USGS, Menlo Park, California, on request. A companion

tape containing all processing results (except Fourier amplitude

spectra ordinates) is available from the National Geophysical Data

Center, 325 Broadway (Mail E/GC11), Boulder, Colorado 80303.

TABLE OF CONTENTS

Page

INTRODUCTION ------------------------ 1

PROCESSING PROCEDURES ------------------- 1

ACKNOWLEDGMENTS ---------------------- 5

REFERENCES ------------------------- 5

TABLES

Table 1. USGS-NSMIN Stations; 3-15 km Epicentral Distance - 6

Table 2. Records Data ------------------- 7

APPENDICES

1. Uncorrected accelerogram -------------- H

2. Corrected acceleration, velocity, displacement - - - 27

3. Response spectrum; tripartite plot --------- 73

A. Fourier amplitude spectrum; log-log plot ------ 101

5. Current list of processed records ---------- 147

11

Table of Contents for Computer Plots

Whittier Narrows, California, Earthquake of October 1, 1987 USGS-NSMIN stations within 15 km of epicenter

Station, recorder location, and component directions

Page no. for plots of four processing steps* 1234

Garvey reservoir abutment control bldg: 060, Up, 330

Whittier Narrows DamCrest: 033, Up, 303 Upstream: 152, Up, 062

Alhambra: 900 S. Fremont Basement: 090, Up, 360 6th floor: 090, Up, 360 12th floor: 090, Up, 360

Whittier: 7215 Bright Avenue Basement: 180, Up, 090 5th floor: 180, Up, 090 10th floor: 180, Up, 090

Bell: Los Angeles Bulk Mail Center: 010, Up, 280

Vernon: 4814 Loma Vista Avenue CMD Terminal: 007, Up, 277

Norwalk: 12400 Imperial Highway Basement: 090, Up, 360 4th floor: 090, Up, 360 Roof: 090, Up, 360 South ground site: 090, Up, 360

12

1314

21

22

23242526

28

3134

151617

181920

374043

464952

55

58

61646770

74

7780

83

86

89

92

95

98

102

105108

111114117

120123126

129

132

135138141144

^Processing stages and plot format:1. Uncorrected accelerogram (first 20 seconds).2. Corrected acceleration, velocity, displacement (first 20 seconds).3. Response spectrum; tripartite plot.4. Fourier amplitude spectrum; log-log plot.

Note: In column 1, each plot contains all three components.In columns 2 through 4, the indicated page number refers to the first of three components for this record.In column 3, no plots of response spectra are provided for upper levels of

, buildings.

PROCESSED STRONG-MOTION RECORDS WHITTIER NARROWS, CALIFORNIA EARTHQUAKE, OCTOBER 1, 1987

VOLUME I

USGS-NSMIN STATIONS WITHIN 15 KM OF THE EPICENTER

INTRODUCTION

Fifty-two stations within the National Strong-Motion Instrumentation Network (NSMIN) operated by the U.S. Geological Survey (USGS) were triggered by the ML=5.9 Whittier Narrows earthquake on 1 October, 1987 (Etheredge & Porcella, 1987). Epicentral distances range from 3 to 79 km. This report contains the results of processing the film accelerograms obtained from instruments within 15 km of the epicenter. Computer plots of uncorrected acceleration, corrected acceleration, velocity, and displacement, response spectra (except for the upper levels in buildings) and Fourier amplitude spectra are included in the Appendices. A companion tape is available from the National Geophysical Data Center (NGDC), 325 Broadway, (Mail E/GC11), Boulder, Colorado 80303.

Processing of the Whittier Narrows data from stations farther from the epicenter is continuing. The stations included here, with epicentral distances between 3 and 15 km, are listed in Table 1 and plotted in Figure 1. Further division of the triggered stations from the earthquake includes a group of three buildings between 15 and 17 km epicentral distance together with the Santa Ana River Pipeline Bridge, stations out to 31 km, to 35 km, and to 47 km. The total number of digitized data channels is expected to be 248, selected from the 358 data channels at the 52 triggered stations.

PROCESSING PROCEDURES

The original film records, 70 mm wide, were contact printed onto direct positive mylar film. Exposure and developing times were selected to produce a contrast between black trace and clear background that was most satisfactory for subsequent digitizing, and to ensure that faint traces became digitizable.

Digitizing was performed on the contact prints by a commercial digitizer using a computer-controlled trace-following laser scanner. The machine has a least count of 1 micron (10 meter) and an accuracy in the RMS sense, while digitizing a straight line, of ±3 to ±15 micron depending on the clarity of the edges of the line (Fletcher and others, 1980). Overall accuracy of the optics is maintained by digitizing a square grid, and performing an appropriate optical correction on every digitized point.

The raw data is almost equispaced at approximately 600 samples per cm (that is, 600 samples per second of record time), although higher densities are required around the sharpest peaks.

The first processing steps are (Converse, 1984): 1, reassemble the data, digitized in three successive 10-second frames, into 30 sec (approximately)

time series; 2, adjust the time coordinates in accordance with the digitized time marks; 3, subtract an adjacent reference trace; 4, subtract the applicable mean value; and 5, scale for units of seconds and cm/sec/sec. The resulting data, having had no direct and specific alteration of their frequency content, have long been called uncorrected acceleration.

Corrections affecting particularly the high frequency end of the useful spectrum include: an instrument correction (applied across the entire spectrum but having most visible affeccs at frequencies higher than Ihe natural frequency of the instrument); a high-frequency low-pass filter at 50 Hz with a cosine taper to zero at 100 Hz; and decimation to 200 samples per second.

Filtering out the low-frequency noise is performed with a bidirectional Butterworth filter placed at such a frequency as to retain as much as possible of the low-frequency content, but to exclude that part of the signal overly contaminated by noise. These Are conflicting requirements, and vary from station to station, and possibly even from trace to trace on the same record. It is always desirable to retain periods as long as, or longer by a factor of two than, the rupture duration, insofar as this can be approximated by the strong-motion duration of the record (Basili and Brady, 1978). In structural records it is of course desirable to retain content with periods equal to or greater than the longest natural mode period of the structure.

Several opportunities exist for ascertaining the low frequency below which noise problems are present and must subsequently be removed.

1. Accelerations after two integrations must show displacements at the periods in question, and longer, that do not disagree substantially with those that might be expected, by the seismological community, from traditional displacement meters.

2. Displacements, at the periods in question, derived from stations sufficiently close to each other, will be coherent (for example, Hanks (1975)), that is, they will have similar shapes, although offset by applicable small time intervals.

3. Displacements from recorders within a structure, at periods longer than the natural periods of the fundamental resonant modes, will be coherent.

4. The Fourier amplitude spectrum and the tripartite response spectrum of a noise-free record will fall off smoothly at longer periods. Long period noise, if concentrated within a specific frequency range, will show clearly.

5. The Fourier amplitude spectrum of a true straight line, digitized as though it were an acceleration trace, is a basic measure of noise in the digitizing system at all frequencies. If this spectrum meets and coalesces with the calculated Fourier spectrum of a record at long periods, it is clear that in this period range noise is dominant.

.»6. The Fourier spectrum of a reference trace on the record, digitized in the normal course of digitization of all traces, is a basic measure of noise in the recording system and digitizing system at all frequencies. Some long-period noise sources, resident in the recorder itself, are

removed from the signal during the subtraction of the reference trace, followed by subtraction of the mean value. If, however, these recorder- resident noise sources are insignificant and the reference traces are close to truly straight, then the merging of the two Fourier spectra (of uncorrected accelerogram and reference trace) at long periods indicates a region where noise is dominant.

These conditions would normally play significant roles in the selection of the long-period limit for individual records in this report and for the remainder of the Whittier Narrows earthquake records. However, records from different elevations in the 12-story Alhambra building and the 10-story Whittier building introduce a new phenomenon concerning long-period content that must be investigated further.

Calculations of corrected displacements and velocities at different levels in the Alhambra building are shown in Appendix 2, using a 4-second filter. This filter was chosen to leave unaffected the response in the first mode with natural period of 2.0 seconds. During the first 2 seconds, between triggering and S-wave arrival, the displacements in the east direction (90°) and the north direction (360°) are surprisingly consistent over the three levels. The shape of the plotted displacement is dependent on the order of the processing (integrate the raw acceleration for velocity, filter the velocity allowing the initial value to be non-zero, and finally integrate velocity for displacement with initial displacement set to zero), but the implication is that the entire building is accelerating to the west during these first 2 seconds, reaching 3.1 cm/sec/sec at 2 seconds, or, possibly, tilting up to the west by 0.0032 radian in the same time period. To the north, the implied acceleration is 5.6 cm/sec/sec, or a tilt up to the north of 0*0057 radian.

The same phenomenon can be seen in the velocities and displacements at all levels in the Whittier building, where the implication is that the building is accelerating to the east (or tilting up to the east) and accelerating to the south (or tilting up to the south).

The consistency of the calculations for these early accelerations from the corrected velocity and displacement confirms that the behavior is not likely to be caused by noise, which would have affected the twelve applicable horizontal recordings in a more random fashion.

Such internal consistency of building displacements has not been seen at other locations for this earthquake, and the long-period limit has been dropped to 2 seconds at the Garvey Reservoir Abutment Building, the Whittier Narrows Dam, the Los Angeles Bulk Mail Center in Bell, 4814 Loma Vista Avenue in Vernon and 12400 Imperial Highway in Norwalk. The records from the Norwalk building basement produced velocity and displacement plots clearly contaminated by noise when a 4-second long-period filter was attempted.

A project is underway to carry on with this investigation of ground motion leading up to the arrival of the first shear waves.

In the corrected plots in Appendix 2, the bidirectional Butterworth filter is used for long-period removal, and is applied to the velocity data (obtained by integration from the uncorrected acceleration). This filter

allows the resulting initial velocity to be non-zero. Acceleration and displacement are calculated from this corrected velocity by differentiation and integration, respectively. The integration for displacement commences with zero displacement.

An option exists that assumes the recorded acceleration is preceded by zero acceleration. Processing of the record with leading zeros allows the displacement to have attained non-zero values by the time of actual record triggering. This displacement data, ..id ,. .iir plots, are subsequently provided from this time of actual triggering, where in general the displacement is non-zero.

In either treatment, the displacement is not forced to have an average value close to zero by the end of the record. Particularly in the cases where routine processing is used, the final displacement is occasionally seen to be oscillating about a value that is different from zero. Insofar as this is directly attributable to the unknown initial displacement, and may be considered in the same way as an arbitrary integration constant is usually considered, it is not an important issue. Studies using peak displacements will need care in the measurement of peak displacements from such records.

Table 2 contains peak values of ground motion for all components included in this report. The scaled peak accelerations are from Etheredge and Porcella (1987) who scaled them from the original film records. The uncorrected peak accelerations are obtained from the digitized records, and the corrected peak acceleration, velocity, and displacement occur after filtering for high- and low-frequency noise. The low frequency cut is listed in the last column. The specific direction sense of the peak motions, in the component directions listed, is not of particular importance, although it is indicated for the digitized data.

FURTHER COMMENTS ON SOME INDIVIDUAL STATIONS.

Whittier Narrows Dam.

The crest and upstream instruments are not connected for simultaneous triggering or common timing, although an inspection of the vertical traces of uncorrected and corrected data indicates there are sufficient matches to be confident of near-simultaneous triggering (within 0*05 sec)* A long-period limit of 2 sec was required to ensure the first 2 sec of displacement was free of unidentified noise.

Alhambra; 900 S. Fremont; Basement, 6th, and 12th floors.

These three recorders are wired for simultaneous triggering and common timing. Digitizing on all nine traces was commenced at the common trigger time. A fundamental first mode period of 2.0 sec scaled from the 12th floor 360° component indicated that a long period limit greater than 2 sec was required, in order that this 2 sec signal be retained with its full ^amplitude. A long-period limit of 4 sec has resulted in an interesting phenomenon that is visible in both horizontal directions at all three levels and is described in an earlier section.

Whittier; 7215 Bright Ave; Basement, 5th, and 10th floors.

These three instruments are wired for simultaneous triggering and common timing. A 4-second long-period limit has been chosen, even though it is well above the fundamental period of vibration of the building, to help in the above description of the ground motion during the first two seconds after triggering and before the shear wave arrival.

Vernon; 4814 Louia Vista Ave. (CMD Terminal).

The sharp spike at 5.3 sec on the 277° component of uncorrected accel eration is on the original film and digitized correctly; its high frequency catapults it to the highest peak during the instrument correction phase of the processing. There is no visible effect on velocity and displacement.

Norwalk; 12400 Imperial Highway.

The three recorders in the building (Basement, 4th, Roof) are triggered simultaneously; the South Ground Site has a separate trigger. Judging from the 0*5 sec and 0.8 sec pulses in displacement passing the ground level stations between 3 and 5 sec after their triggering, we calculate the South Ground Site actually triggered 0.35 sec before the Basement. The vertical components have a 4 Hz packet arriving at about 4 sec after triggering. Aligning these confirms this 0.35 sec delay in trigger times.

As mentioned in the earlier discussion, the Basement record produced velocity and displacement traces clearly contaminated by noise when a 4-second long-period filter was attempted.

ACKNOWLEDGMENTS

The authors wish to thank those who, over many years of instrument main tenance, and over hours of record keeping, photographic printing, digitiza tion, typing, programming, and report preparation, have contributed to the quality of the basic recorded data from the Whittier Narrows earthquake and the subsequent usefulness of the data in this report.

REFERENCES

Basili, M. and G. Brady (1978). Low frequency filtering and the selection of limits for accelerogram corrections: Proc., 6th European Conf. on Earthquake Engineering, Dubrovnik, Yugoslavia.

Converse, April (1984). AGRAM, a series of computer programs for processing digitized strong-motion accelerograms, version 2.0: U.S. Geological Survey Open-File Report 84-525.

Etheredge, E. and R. Porcella (1987). Strong-motion data from the October 1, 1987 Whittier Narrows earthquake: U.S. Geological Survey Open-File Report 87-616.

Fletcher, J. B., A. G. Brady, and T. C. Hanks (1980). Strong-motion accelero-

grams of the Oroville, California, aftershocks: data processing and theaftershock of 0350 August 6, 1975: Bull. Seis. Soc. Am., 70, 1, 243-267

Hanks, T.C. (1975). Strong ground motion of the San Fernando, California,Earthquake: ground displacements: Bull. Seis. Soc. Am. 65, 1, 193-225.

Table 1

National Strong-Motion Instrumentation Network stations; 3-15 km Epicentral Distance

Coord. Name (instrumentation Owner)

Epic.Dist. Site°N,°W (km) Geology

Garvey Reservoir Abutment Building (MWD) 118.11

Whit tier Narrows Dam (ACOE) Crest, Upstream

Alhambra: 900 S. Fremont Blvd. (USGS) Basement, 6th, 12th floor

Whittier: 7215 Bright Ave. (USGS) Basement, 5th, 10th floor

Bell: Los Angeles Bulk Mail Center (USGS) 118.16

Vernon: 4814 Loma Vista Ave. (USGS) 118.20

Norwalk: 12400 Imperial Highway (USGS/BECH) Basement, 4th, Roof; South ground site

34.05 3

34.03 4 118.05

34.09 8 118.15

33.977 10 118.036

33.99 11

34.00 13

33.92 15 118.07

Rock

Alluvium

PNM (soft)

Alluvium

Al luv i urn

Alluvium

Alluvium

Station owners: MWD, Metropolitan Water District of S. Calif.ACOE, U.S. Army Corps of Engineers.BECH, Bechtel Power Corporation.

Site Geology: PNM, Pleistocene non-marine sand and terrace deposits.

Table 2. Records Data

Station and location

Garvey Reservoir

Whittier NarrowsCrest

Upstream

Component direction

Scaled peak ace In

(g)

Uncorrected peak ace In (cm/a/a)

ace In (cm/8/s)

Correctedvel. (cm/8)

displ. (cm)

Low freq. cut

(Hz)

Abutment Bid 5,,060Up330

Dam033Up303

152Up062

.33

.38

.47

.31

.19

.32

.31

.46

.24

-367.7-379.3-469.4

295.9179.7

-317.0

302.6465.5231.7

-367.1-373.5-468.2

294.0-177.0-308.3

291.2521.0225.4

15.407.56

-19.78

19.634.39

-17.46

-14.147.94

14.19

-1.420.96

-2.21

-1.480.271.18

1.30-0.32-1.59

.5

.5

.5

.5

.5

.5

.5

.5

.5

Alhambra: 900 S. FremontBasement

6th floor

12th floor

Whittier: 7215Basement

5th floor

10th floor

090Up360

090Up360

090Up360

Bright Ave.180Up090

180Up090

180Up090

Bell: Los Angeles Bulk Mail010Up280

.30

.19

.26

.47

.18

.37

.28

.29

.23

.40

.26

.63

.61

.34

.60

.41

.54

.54

Center.34.52.46

-286.8184.6252.9

-461.4179.1

-351.5

-266.1276.5226.5

380.9242.1

-611.9

545.6309.4580.4

395.8510.3517.8

-320.2501.1445.5

-284.2189.5249.8

-462.7193.2

-355.9

-271.4-335.1230.7

381.9245.5-606.7

539.5345.0

-600.9

417.9549.4514.0

-322.1517.6436.9

11.265.1320.82

21.94-6.5326.75

-22.97-10.2337.64

-26.59-7.60-27.70

-35.2910.31

-24.23

-43.71-11.35-33.37

13.95-8.57-35.79

-1.460.55

-3.17

-3.63-0.705.12

-5.781.18

-8.74

-3.880.84

-2.45

-5.84-1.00-3.06

-7.271.043.92

1.490.67-4.37

.25

.25

.25

.25

.25

.25

.25

.25. « 25

.25

.25

.25

.25

.25

.25

.25

.25

.25

.5

.5

.5

Table 2. Records Data - Continued

Station and location

Component Scaled direction peak accln

(g)

Uncorrected peak accln(CTB/8/8)

Corrected Lowaccln vel. displ. freq. cut (cm/8/8) (cm/8) (cm) (Hz)

Vernon: 4814 Loma Vista Ave. (CMD Terminal)Basement 007 .29 -270.8

Up .17 -150.0277 .22 -210.6

Norwalk: 12400 Imperial HighwayBasement 090 .12

Up .07 360 .21

4th floor

Roof

South Ground Site

090Up360

090Up360

090Up360

.17

.12

.33

.21

.18

.40

.10

.09

.29

-108.662.6

204.6

-167.3-105.7 315.4

-185.9-124.8 413.9

89. 88.

-243.9

267.3 140.5 239.9

-104.662.9201.5

-164.3-102.2 317.4

-187.0-121.5 436.6

89.388.8

-234.9

18.57-3.42-20.31

-7.002.7919.97

10.134.37

24.81

-18.59-6.43 42.02

-9.313.51

21.61

-2.58 0.42 2.19

0.920.272.44

-2

1.350.34

83

-2 910.695.45

-0.90 0.32 2.84

.5

.5

.5

.5

.5

.5

.5

.5

.5

.5

.5

.5

.5

.5

.5

Note: The digitization of these records was done in three frames of approximately 10 s each, totalling 30 s. All peaks listed here occurred in the first 10 s. We include plots only to 20 s. The companion tape includes data to 30 s. See the note in the Preface.

WHITTIER NARROWS DAM

LOS ANGELES-BMC

WHITTIER-BRIGHT

Figure 1. USGS-NSMIN stations with records in this report (adapted from Etheredge and

Porcella, 1987).

Appendix 1

Uncorrected accelerogram

11

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Appendix 2

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27

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73

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20

80

RESPONSE SPECTRRWH1TTIER NRRROWS DRM - UPSTRERM, 10/01/87, 1HIJ2UTC UP

0.2.5,10.20 PERCENT CR1T1CRL DRMPING :FILTERS: BUTTERWORTH. ORDER IJ. 0.500 HZj RNT1RL1RS 50 - 100 HZ

1000.00

MOO.00

200.00

LJLJin

LJI

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LJD _J LU

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10.00

0.2'04 0.1 0.2 O.M 1 2 »4 10


81

RESPONSE SPECTRRWHITTIER NRRROWS DRM - UPSTRERM. 10/01/87, 14IJ2UTC

0.2.5,10.20 PERCENT CR1T1CRL DRMPING -FILTERS: BUTTERHORTH. 0RDFR M. 0.500 HZ: RNT1RURS 50 - 100 HZ

1000.00

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RESPONSE SPECTRflflLHflMBRR. 900 S. FREMONT. BflSEMENT. 10/01/87. 1M42UTC

0,2.5,10,20 PERCENT CR1TICRL DflMPING -FILTERS: BUTTERHORTH, ORDER 4. O.?r,0 HZs flNTlflLIfiS 50 - 100 HZ

1000.00

400.00

200.00

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0.2'04 0.1 0.2 0.4 124 10

UNDflMPED NflTURflL PERIOD-SECONDS20

83

RESPONSE SPECTRRRLHRMBRfl, 900 S. FREMONT, BRSEMENT, 10/01/87. 1MH2UTC

0,2.5.10.20 PERCENT CRITICflL DRMPING - 'i'TERSs BUTTERHBP.TH. ORDER ». 0.250 HZ; RNT1RL1R5 50 - 100 H7

1000.00

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UP

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84

VELOCITY RESPONSE-CM/SEC

00

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u> CD o

HH1TT1

10000

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2000

RESPONSE SPECTRRER. 7215 BRIGHT RVE. BRSEMENT. 10/01/87. 1HM2UTC

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hfl'TlQNRL STH ONG MOTION DflTfl CENTER

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200

100

0.) 0.2 0.4 124 10 UNDflMPED NflTURflL PERIOD-SECONDS

86

RESPONSE SPECTRfiWHITTIER. 7215 BRIGHT flVE. BflSEMENT. 10/01/87. my2UTC

0,2.5,10.20 PERCENT CRITlCfiL DflMPING .FILTERS: BUTTERHORTH. ORDER M. 0.250 HZ: RNT1RL1RS 50 - 100 HZ

1000.00

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200.00

100.00

UP

LUin

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in LUGC

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NRTIONRL STRONG

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OM 0.1 0.2 0.1 124 10 UNDRMPED NflTURRL PERIOD-SECONDS

20

87

RESPONSE SPECTRflWHITTIER. 7215 BRIGHT RVE. BflSEMENT. 10/01/87. mH2UTC

0,2,5.10,20 PERCENT CRIT1CRL DflMPING -FILTERS: BUTTERWDRTH. ORDER U. 0.250 HZj RNTlflLlflS 50 - 100 HZ

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2000.00

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20.00

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OM 0.1 0.2 0.4 124 10 UNDRMPED NflTURRL PERIOD-SECONDS

20

88

RESPONSE SPECTRflBELL - BULK MfilL FflClLlTY. 10/01/87. mM2UTC, 10

0,2.5,10.20 PERCENT CR1T1CRL DRMPING .FILTERS: BUTTERWORTH. ORDER U. 0.500 HZ; RNT1RL1RS 50 - 100 HZ

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04 0.1 0.2 O.M 124 10 UNDOMPED NflTURRL PERIOD-SECONDS

20

89

LJ LUin

LJI LUinz oCLin LU cc

LJ D_JLU

RESPONSE SPECTRflBELL - BULK MRIL FRCILITY. 10/01/87. H4M2UTC' UP

0,2.5,10,20 PERCENT CRIT1CRL DRMPING -FILTERS: BUTTERHOR7H, ORDER M, 0,500 HZs fiNTlRilflS 50 - 100 HZ

1000.00

400.00

200.00

100.00

MO.00

20.00

10.00

0.1 0.2 O.M UNDRMPED NRTURRL

1 2 4 10 PERIOD-SECONDS

20

90

RESPONSE SPECTRflBELL - BULK MfllL FRCILITY. 10/01/87. 1MM2UTC- 280

0,2,5,10.20 PERCENT CR1T1CRL DRMPING -FILTERS: BUTTERWORTH. ORDER M. 0.500 HZ: flNTJRURS 50 - 100 HZ

LJ LJtn

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20

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RESPONSE SPECTRR VERNON - CMD TERMINRL - BRSEMENT. 10/01/87. 1442UTC UP

0,2.5,10.20 PERCENT CRIT1CRL DRMPING - FILTERS: BUTTERWORTH. ORDER H. 0.500 HZ: RNTlflLlflS 50 - 100 HZ

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93

RESPONSE SPECTRRVERNON - CMD TERMINRL - BflSEMENT. 10/01/87. 1MU2UTC 277

0,2,5,10,20 PERCENT CRIT1CRL DRMPING -FILTERS: 3UTTERWOFaH, ORDER '!. O-liOD t-Pt JWT!flUP!v 50 100 HZ

1000.00

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94

RESPONSE SPECTRflNORNflLK. 12400 IMPERlflL HIGHHRY. BflSEMENT. 10/01/87, 1442UTC

0.2,5.10,20 PERtENT CRIT1CRL DflM^ING .FILTERS: BUTTERWORTH, ORDER H. 0.500 HZ: flNTJRURS 50 - 100 HZ

1000.00

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90

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20

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RESPONSE SPECTRfl NORHRLK. 12HOO IMPERIRL HIGHHRY. BRSEMENT. 10/01/87. . -,

0.2.5.10.20 PERtENT CRITlCflL DRMf>ING -FILTERS: BUTTERWORTH. ORDER H. 0.500 HZs RNT1RL1RS 50 - 100 HZ

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UNDRMPEEJ NRTURRL PERIOD-SECONDS20

97

z o

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20

100

Appendix A

Fourier amplitude spectrum; log-log plot

101

301

LOG OF FOURIER AMPLITUDE, CM/SEC

-1012

T

o o

33 m Oc m z o

O c

3333

50 33 m1

3288*

-

9m

m o

^ i

CN

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AM

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TU

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PE

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UM

O

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CC

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RA

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N

GA

RV

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IR -

CO

NTR

OL

BU

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ING

UP

E

AR

THQ

UA

KE

O

F O

CTO

BE

R

1,

19

87

1442

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UTT

ER

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AT

.5

H

Z,

OR

DE

R

4 C

OM

PU

TIN

G

OP

TIO

NS

^ Z

CR

OS

S.N

ON

OIS

E

Fc

a LJ in (J

Id a ID OH

UJ o u. u.

O O o

j i

J______L

I I.

I 1

0

1

LOG

O

F F

RE

QU

EN

CY

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VOT


1012

O O

-n33m Oc m z o

mOc

o 3 >m o i *3leg

0^-1073 T]zO m

I o«

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m

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Appendix 5

Current list of processed records

147

CURRENT LIST OF PROCESSED RECORDS

USGS processing of records from the USGS permanent network of strong-motion accelerographs and associated networks

Strong motion data from earthquakes 1978* and later.

TABLE 1. Chronological list of events and associated reports describing theexistence/processing/analysis/availability of digital data on tape from NOAA, or from thn " *-"r? " 3tr<v'£ Motion Data Center in Menlo Park,

Date & Time (Gmt) Earthquake Reference (see attached list)

January 1, 1975; 0355

March 25, 1978

August 27, 1978 and two later shocks

August 6, 1979

October 15, 1979

October 15, 1979

October 15, 1979; 2317:41, 2318:20, 2318:40

October 16, 1979, 0706

December 13, 1981 and March 18, 1983

February 13, 14, and 23, 1983

May 2 and May 9, 1983

July 9, 1983; 0740

Southern Alaska

Coyote Dam, California

Monticello Dam, Jenkinsville, South Carolina

Coyote Lake, California

Imperial Valley, California

Imperial Valley, California

Imperial Valley California aftershock

Monticello Dam, Jenkinsville, South Carolina

Solomon Islands

Monasavu Dam, Fiji

Coalinga, California


OFR 86-191(Silverstein, Brady, Mork, 1986b)

OFR 83-166 (Brady & Perez, 1983)

OFR 81-0448 (Brady & others, 1981)

OFR 81-42 (Brady & others, 1980)

OFR 80-703 (Brady, Perez & Mork, 1980)

OFR 82-183 (Perez, 1982)

OFR 86-441 (Brady, Mork, Silverstein)

OFR 81-1241 (Mork & Brady, 1981)

OFR 86-264 (Silverstein, Brady, Mork, 1986a)

OFR 85-375 (Silverstein, 1985a)

OFR 84-626 (Maley & others, 1984)

OFR 85-584 (Silverstein, 1985b)

*With inclusion of isolated earlier events recently processed.

148

TABLE 1* Chronological list of events and associated reports (continued)

Date & Time (Gmt) Earthquake Reference (see attached list)

July 22, 1983; 0239

April 24, 1984

December 23, 1985; 0516 Nov. 9, Dec. 23, Dec 25

January 26, 1986; 1920

October 1, 1987; 1442


Morgan Hill, California

Nahanni,Northwest Territories,Canada

Hollister, California

Whittier Narrows, California

OFR 85-250 (Silverstein and Brady, 1985)

OFR 84-498, Vol I and II (Compiled by Seena Hoose)

Geol. Survey of Canada Open File Report 86-1-PGC, (Weichert and others, 1986)

OFR 86-156, (Brady and others, 1986)

OFR 88-354, (Brady and others, 1988)

149

TABLE 2. Processed records in each report

January 1, 1975; 0355; southern Alaska; OFR 86-191.Records (4): Anchorage, 500 W. Third St., Basement

Anchorage, Alaskan Methodist University Anchorage, Government Hospital Talkeetna, FAA-VOR Building

March 25, 1978; Records (3):

uam, ««alifornia; OFR 83-166. Coyote Dam, Ukiah, California: abutment, toe, crest

August 27} 1978, 1023 and 2 later shocks; Monticello Dam, South Carolina, OFR 81-0448. Records (3): Jenkinsville, Monticello Dam

Shared abutment (center crest)

August 6, 1979, Coyote Lake, California; OFR 81-42.Records (6): Coyote Creek, San Martin, California

Gilroy Array: Station 6, San YsidroStation 4, San Ysidro School Station 3, Sewage Treatment Plant

Gilroy Array Gilroy ArrayGilroy Array: Station 2, Mission Trails Motel Gilroy Array: Station 1, Gavilan College

October 15, 1979, 2317; The Imperial Valley Earthquake; OFR 80-703. Records (22): El Centre Array 7, Imperial Valley College

El Centro Array 6, Huston Road El Centro, Bonds Corner, Hiways 98 & 115 El Centro Array 8, Cruickshank Road El Centro Array 5, James Road El Centro Differential Array El Centro Array 4, Anderson Road Brawley, Brawley Municipal Airport Holtville, California, Holtville Post Office El Centro Array 10, Keystone Road Calexico, California, Calexico Fire Station El Centro Array 11, McCabe School El Centro Array 3, Pine Union School Parachute Test Facility El Centro Array 2, Keystone Road El Centro Array 12, Brockman Road Calipatria, California, Calipatria Fire Station El Centro Array 13, Strobel Residence El Centro Array 1, Borchard Ranch Superstition Mountain, California Plaster City, California, Storehouse Coachella Canal Number 4, California

October 15, 1979, 2317:41; Imperial Valley Aftershocks; OFR 86-441, Records (6) El Centro Array 5, James Road

El Centro Array 6, Huston Road El Centro Array 7, Imperial Valley College El Centro Array 8, Cruickshank Road El Centro Array 9, Commercial Ave. El Centro Differential Array

150

TABLE 2. Processed records in each report (continued)

October 15, 1979, 2318:21; Imperial Valley Aftershocks; OFR 86-441 Records (6) El Centro Array 5, James Road

El Centro Array 6, Huston Road El Centro Array 7, Imperial Valley College El Centro Array 8, Cruickshank Road El Centro Array 9, Commercial Ave. El Hentro Differential Array

October 15, 1979, 2318:42; Imperial Valley Aftershock; OFR 86-441Records (7)

October 15, 1979; Records (22):

El Centro Array 6, Huston RoadEl Centro Array 7, Imperial Valley CollegeEl Centro Array 8, Cruickshank RoadEl Centro Array 9, Commercial Ave.El Centro Differential ArrayBonds Corner, Highways 115 & 98Holtville Post Office

The Imperial Valley, California; OFR 82-183;This report contains the time-dependent response spectrumplots for the same records in OFR 80-703, above.

October 16, 1979, 0706 Gmt, Monticello Dam, South Carolina, OFR 81-1214. Records (1): Jenkinsville, South Carolina, Monticello Dam

shared abutment (center crest)

December 13, 1981 and March 18, 1983; Solomon Islands, OFR 86-264 Records (5): Dec. 13, 1981, 0129 Gmt: 460 Beach, Panguna Mine,

Bougainville Island. Dec. 13, 1981, 1324 Gmt: " March 18, 1983: Arawa Town

Bato Bridge BVE80, Panguna Mine.

February 13, 14, and 23, 1983; Monasavu Dam, Fiji; OFR 85-375 Records (3): Feb 13, 14, 23, 1983: Monasavu Dam.

May 2 and May 9, 1983; Coalinga, California; OFR 84-625* Records (13): May 2, 1983, 2342 Gmt;

Pleasant Valley Pump Plant: switchyard, basement

May 9, 1983, 0249 Gmt

Anticline Ridge: .freefield and pad Burnett ConstructionOil CityOil Fields Fire Station Palmer Avenue

f Skunk HollowPleasant Valley Pump Plant: switchyard, basement,

1st floor, roof

151

TABLE 2. Processed records in each report, (continued)

July 9, 1983; 0740; Coalinga, California; OFR 85-584 Records (9): Anticline Ridge: freefield and pad

Burnett Construction Oil CityOil Fields Fire Station: freefield and pad Palmer Avenue Skunk Hollow Transmitter Hill

July 22, 1983; 0239; Coalinga, California; OFR 85-250 Records (13): Anticline Ridge: pad site

Burnett Construction Oil CityOil Fields Fire Station: freefield and pad Palmer Avenue Pleasant Valley Pump Plant: 1st floor, basement, roof,

switchyard, freefield Skunk Hollow Transmitter Hill

April 24, 1984; Morgan Hill, California; OFR 84-498B, Vol. II. Records (11): Anderson Dam: downstream, crest

Hollister City Hall Annex Hollister Differential ArraySan Justo Damsite: right abutment, left abutment San Jose 101/280/680 bridge Hollister Differential Array No. 1, 3, 4, 5

December 23, 1985; with foreshock and aftershocks; Northwest Territories,Canada; OFR in press.Records (6): Nov. 9, 1985; 0446 Gmt:

Dec. 23, 1985; 0516 Gmt: Dec. 23, 1985; 0548 Gmt: Dec. 25, 1985; 1543 Gmt:

Nahanni Site 2 Nahanni Sites 1, 2, Nahanni Site 1 Nahanni Site 3

January 26, 1986; Hollister, California; OFR 86-156Records (5): Hollister Digital Differential Array, Stations 1, 3, 4,

October 1, 1987; Whittier Narrows, California; OFR 88-354 Records (15): Garvey Reservoir Abutment Building

Whittier Narrows Dam: crest, upstream Alhambra; 900 S. Fremont: Basement, 6, 12 Whittier; 7215 Bright: Basement, 5, 10 Bell; L. A. Bulk Mail Center Vernon; 4814 Loma Vista AvenueNorwalk; 12400 Imperial: Basement, 4, Roof, South

ground level

152

eferences

Brady, A. G., Etheredge, E. C., Malcy, R. P., Mork, P. N., Silverstein, B. L., Johnson, D. A., Acosta, A. V., Forshee, R. D., and Salsman, M. J., 1986, Preliminary report on records from the USGS-maintained strong-motion network in the Hollister area, January 26, 1986: USGS Open-File Report 86-156, 43 pp.

Brady, A. G., Mork, P. N., and Fletcher, J. P., 1981, Processed accelerograms from Monticello Dam, South Carolina, 27 August 1978, and two later shocks: USGS Open-File Report 81-0448, 35 pp.

Brady, A. G., Mork, P. N., Seekins, L. (1988). Processed strong-motionrecords; Whittier Narrows, California, earthquake; October 1, 1987, Volume 1: USGS-NSMIN stations within 15 km of the epicenter: U.S. Geological Survey Open-File Report 88-354.

Brady, A. G., Mork, P. N., and Silverstein, B. L., 1986, Processed strong motion records from the 2317:41, 2318:21 and 2318:42 aftershocks of the 2316:54 October 15, 1979 Imperial Valley, California earthquake. USGS Open File-Report 86-441.

Brady, A. G., Mork, P. N., Perez, Virgilio, and Porter, L. D., 1980, Processed data from the Gilroy Array and Coyote Creek records, Coyote Lake, California earthquake, 6 August 1979. USGS Open-File Report 81-42, 171 pp.

Brady, A. G., Perez, Virgilio, and Mork, P. N., 1980. The Imperial Valleyearthquake, October 15, 1979. Digitization and processing of accelerograph records: USGS Open-File Report 80-703, 309 pp.

Brady, A. G., and Perez, Virgilio, 1983, Processed accelerograms from Coyote Dam, California, March 25, 1978: USGS Open-File Report 83-166, 82 pp.

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____, 1985b, Processed strong-motion records from the Coalinga, Californiaaftershock of July 9, 1983; 0740 Gmt: USGS Open-File Report 85-584, 169 pp.

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____, 1986b, Processed strong-motion records from the southern Alaskaearthquake of January 1, 1975; 0355 Gmt: USGS Open-File Report 86-191, 99 pp.

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UNITED STATES DEPARTMENT OF THE INTERIOR …implication is that the entire building is accelerating...

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