u.s. geological survey · department of the interior u.s. geological survey processed strong-motion...

DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

Processed Strong-Motion Data forthe Central Chile Earthquake of March 3, 1985:Fifteen Accelerograph Sites Owned by CHILECTRA,

ENDESA, and the Department of Geology and Geophysics,University of Chile

K. W. Campbell S. T. Algermissen

Edgar Kausel L. M. Highland

Open-File Report 89-448

This report is preliminary and has not been edited or reviewed for conformity with U.S. Geological Survey publication standards and stratigraphic nomenclature. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the United States Government. Any use of trade names and trademarks in this publication is for descriptive purposes only and does not constitute endorsement by the U.S. Geological Survey.

Denver, Colorado

1989

CONTENTS

Introduction ......................................................... 2

Recording Sites and Instrumentation .................................. 3

Processing Methodology ............................................... 3

References ........................................................... 6

Data Availability .................................................... 7

Acknowledgements ..................................................... 7

Appendix Processed Strong-Motion Data .............................. 17

Cauquenes ....................................................... A-1

Colbun ......................................................... A-22

Constitucion ................................................... A-43

Hualane ........................................................ A-64

Iloca .......................................................... A-85

Los Vilos ..................................................... A-106

Melipilla ..................................................... A-123

Pichilemu ..................................................... A-144

Quintay ....................................................... A-165

Rapel ......................................................... A-186

San Fernando .................................................. A-207

San Isidro .................................................... A-228

Santiago (ENDESA Building) .................................... A-249

Ventanas ...................................................... A-270

Zapallar ...................................................... A-291

PROCESSED STRONG-MOTION DATA FORTHE CENTRAL CHILE EARTHQUAKE OF MARCH 3, 1985:FIFTEEN ACCELEROGRAPH SITES OWNED BY CHILECTRA,

ENDESA, AND THE DEPARTMENT OF GEOLOGY AND GEOPHYSICS,UNIVERSITY OF CHILE

INTRODUCTION

The March 3, 1985 (Mg = 7.8) earthquake that occurred off the coast of central Chile is known to have triggered 31 accelerographs located throughout the region (Fig. 1). This report presents processed records from 15 accelerographs owned and operated by CHILECTRA, Empresa Nacional de Electricidad (ENDESA), and the Department of Geology and Geophysics, University of Chile. Processed records from an additional 11 sites are presented by Celebi (1987). In addition, listings of peak accelerations from all 31 recording sites are available in Saragoni et al. (1985) and Wyllie et al. (1986). 2

The mainshock occurred at 7:47 p.m. local time (22:47 UTC) on Sunday March 3, 1985. The epicenter was located off the coast of central Chile approximately 19 km west of the town of Quintay (Fig. 1). The National Earthquake Information Center (NEIC) assigned a surface- wave magnitude of Afs 7.8 for the mainshock, which makes it the largest earthquake to strike central Chile since 1906, when an Mg 8.3 earthquake occurred near Valparaiso (Corate et al., 1986). Modified Mercalli Intensities as high as IX were reported in the coastal towns of San Antonio and Llolleo (Algermissen, 1985); however, intensities ranging from VI to VIII were most common in the epicentral area (Saragoni et al., 1985).

NEIC reported the occurrence of an m^ 5.5 foreshock just 10.4 sec prior to the mainshock. Since the two events occurred so close in time, the Seismological Service of the Department of Geology and Geophysics, University of Chile (DGG) was able only to obtain a location for the foreshock. The earthquake parameters reported by NEIC and the University of Chile (Algermissen, 1985; Wyllie et al., 1986; Celebi, 1987) are given in the following table.

The accelerograph at Peldehue triggered but apparently malfunctioned.

San Isidro accelerograph site is mistakenly referred to as San Pedro in these two references.

Origin Time Lati- Longi- Depth mb Mg Insti- UTC tude tude (km) tute

22:46:56.8 33.11'S 71.74*W 33 5.5 NEIC

22:46:59.9 33.24'S 71.86°W 16 ~ DGG

22:47:07.2 33.14'S 71.87°W 33 6.7 7.8 NEIC

The depths reported by NEIC were constrained to 33 km during their computer analyses and, therefore, do not represent an accurate estimate of focal depth.

Focal mechanism studies, analyses of teleseismic recordings, geodetic measurements, and aftershock studies have led researchers to infer thrusting along the shallow-dipping interface of the Nazca and South American plates during the mainshock and many of the larger aftershocks (e.g., Dziewonski et al. , 1985; Comte et al. , 1986; Christensen and Ruff (1986); Korrat and Madariaga, 1986; Monfret and Romanowicz, 1986; Pardo et al. , 1986; Barrientos, 1988; Choy and Dewey, 1988). This is consistent with subduction of the Nazca plate beneath the continent of South America.

RECORDING SITES AND INSTRUMENTATION

The locations of all accelerographs that recorded the earthquake (except Peldehue) are indicated on Figure 1. The squares identify the 15 sites analyzed in this report. Coordinates, site conditions, and instrument characteristics for each site are summarized in Tables 1 and 2. Epicentral distances, peak amplitudes, and filter parameters for each accelerogram are listed in Table 3.

All but three of the recording sites were equipped with Kinemetrics SMA-1 strong-motion accelerographs. The exceptions were San Isidro and Santiago (ENDESA building), which housed Katsujima PK-130 accelerographs, and Rapel, where a Teledyne RFT-250 accelerograph was installed.

The SMA-1 and RFT-250 accelerographs are fixed-gain instruments that record acceleration on 70-mm film with a recording speed of 1 cm/sec. Nominal values for their recording sensitivity, natural frequency, and damping are 19 mm/£, 25 Hz, and 60 percent of critical, respectively. The PK-130 accelerograph is an automatic gain-ranging accelerograph that records acceleration on 90-mm light-sensitive paper with a recording speed of 5 cm/sec. The natural frequency and damping of the PK-130 accelerograph are not known; however, its frequency response is designed to be flat over the frequency range 0.3-30 Hz.

PROCESSING METHODOLOGY

Processing was performed with AGRAM, an accelerogram processing package developed by the U.S. Geological Survey (Converse, 1984). The relatively poor condition of the original film records made it necessary to digitize the recordings by hand rather than by the laser trace- following device usually used by the U.S. Geological Survey to process strong-motion records. Therefore, four AGRAM routines IOMTAP, BUTTER, REFORM, and SCALE could not be used in their present form and were replaced with similar routines designed to perform the same basic functions. Details of the processing steps are summarized below.

Digitization. The 70-ram film records were photographically enlarged to five times there original size to insure adequate signal-to- noise ratios. For long records, this required that the film be photographed in 100 cm frames, representing about 20 sec of record time. The frames were overlapped by about 5-10 cm during the photographic process to allow accurate reconstruction of the accelerogram after digitization. Because of the large sensitivity and fragile nature of the PK-130 recordings, they were not enlarged prior to digitization.

Each frame was digitized by means of a hand-held cursor on a digitizing table having a resolution of 0.001 in (0.00254 cm). This process resulted in a sample rate of about 250-350 samples per second and an amplitude resolution of about 0.3 cm/sec2 (about 0.0003#) for the film records and 0.03-0.4 cm/sec2 (about 0.00003-0.0004^), depending on the gain of the instrument, for the paper records. When possible, six traces were digitized for each accelerogram: three acceleration traces (one vertical and two horizontal components), two fixed traces, and one set of timing marks. Timing marks were written every 0.5 sec on the film records and every 0.1 sec on the paper records. There were no fixed traces on the accelerograms obtained at Colbiin, Melipilla, Rapel, and Ventanas, so only the acceleration traces and timing marks were digitized for these records.

Phase I (Uncorrected Acceleration). Starting times for each trace were adjusted to minimize phasing errors and the timing trace was interpolated to determine relative time for each data point. Each trace was then adjusted to have an average amplitude of zero, after which absolute amplitudes were computed from instrument sensitivities.

Phase II (Corrected Tine Series). Phase I data were interpolated to 200 samples per second, and in the case of the film records, a frequency domain instrument-correction operator was applied to remove the response of the recording system. Since the high-frequency response of the PK-130 accelerograph is flat to about 30 Hz, no instrument correction was applied to these time series.

When fixed traces were available, high-frequency noise was identified from ratios of the Fourier amplitude spectra of the acceleration and fixed traces. The ratios were plotted as a linear function of frequency to emphasize the high-frequency tail of the spectra. When fixed traces were not available, high-frequency noise was identified directly from the Fourier amplitude spectra of the

acceleration time series. High-frequency noise was removed by applying a 5 Hz bandwidth cosine taper to the Fourier amplitude spectra.

When fixed traces were available, low-frequency noise was identified from ratios of the pseudorelative velocity (PSRV) response spectra of the acceleration and fixed traces. The ratios were plotted as a logarithmic function of period to emphasize the low-frequency tail of the spectra. The filter parameter was chosen to give a minimum signal-to-noise ratio of 2:1, corresponding to signal-to-noise ratios ranging from about 3:1 to 8:1 for peak displacement. When fixed traces were not available, low-frequency noise was identified directly from the PSRV spectra of the acceleration time series. In this latter case, the filter parameter was selected to correspond to the frequency at which the presence of noise became visible on the PSRV spectra. Low-frequency noise was removed with a bidirectional (zero phase), fourth-order Butterworth filter applied in the time domain.

The PK-130 recording system applies a lowcut filter to the acceleration time series as it is recorded. As a result, the low- frequency response of this system begins to roll off at a frequency of about 0,4 Hz (2.5 sec). However, since the response of the system at 0.2 Hz (5.0 sec) the approximate upper limit of useable signal (Table 3) is still 85 percent of the unfiltered response, a low-frequency correction was not found to be necessary.

The instrument-corrected acceleration time series were padded with zeros, integrated, and filtered to obtain velocity. The resulting velocity records were then integrated to obtain displacement. Finally, the padded acceleration time series were filtered and unpadded to obtain corrected acceleration, velocity, and displacement.

Phase III and IV. Fourier amplitude spectra (FAS) and response spectra in terms of relative displacement (RD), relative velocity (RV), pseudorelative velocity (PSRV), absolute acceleration (AA), and pseudoabsolute acceleration (PSAA) were computed from the corrected acceleration time series at 91 periods ranging from 0.04 to 15 sec. The response spectra were calculated for five values of critical damping: 0, 2, 5, 10, and 20 percent.

Processed Data. Plots of the processed time series, Fourier amplitude spectra, and response spectra are displayed in the Appendix. These plots include uncorrected acceleration time series; corrected acceleration, velocity, and displacement time series; Fourier amplitude spectra, and PSRV response spectra. The plots of response spectra include both a logarithmic tripartite plot of pseudorelative velocity and a linear plot of relative velocity. The Fourier spectra are plotted as a function of both logarithmic and linear functions of frequency. On the Fourier spectra plots, FC identifies the lowcut filter limit, F^ identifies the highcut filter limit, F^ identifies the end of the highcut filter transition bandwidth, and AQ identifies the amplitude of the zero-frequency asymptote.

REFERENCES

Algermissen, S.T. (Editor), 1985, Preliminary report of investigations of the Central Chile earthquake of March 3, 1985: U.S. Geological Survey Open-File Report 85-542, 180 p.

Barrientos, S.E., 1988, Slip distribution of the 1985 Central Chile earthquake, Tectonophysics, vol. 145, p. 225-241.

Celebi, M., 1987 (Revised 1988), Processed Chile earthquake records of 3 March 1985 and aftershocks: U.S. Geological Survey Open-File Report 87-195, 255 p.

Christensen, D.H., and L.J. Ruff, 1986, Rupture process of the March 3, 1985 Chilean earthquake: Geophysical Research Letters, vol. 13, p. 721-724.

Choy, G.L., J.W. Dewey, 1988, Rupture process of an extended earthquake sequence teleseismic analysis of the Chilean earthquake of March 3, 1985: Journal of Geophysical Research, vol. 93, p. 1103-1118.

Comte, D., A. Eisenberg, E. Lorca, M. Pardo, L. Ponce, R. Saragoni, S.K. Singh, and G. Suarez, 1986, The 1985 Central Chile earthquake a repeat of previous great earthquakes in the region?: Science, vol. 233, p. 449-453.

Converse, A., 1984, AGRAM: a series of computer programs for processing digitized strong-motion accelerograms: U.S. Geological Survey Open- File Report 84-525, 107 p.

Dziewonski, A.M., J.E. Franzen, and J.H. Woodhouse, 1985, Centroid- moment tensor solutions for January-March, 1985: Physics of the Earth and Planetary Interiors, vol. 40, p. 249-258.

Korrat, I., and R. Madariaga, 1986, Rupture of the Valparaiso (Chile) gap from 1971 to 1985: in Earthquake Source Mechanics, edited by Das, S., J. Boatwright, and C.H. Scholz: Washington, D.C., American Geophysical Union Geophysical Monograph 37, Maurice Ewing Volume 6, p. 247-258.

Monfret, T., and B. Romanowicz, 1986, Importance of on scaleobservations of first arriving Rayleigh wave trains for source studies example of the Chilean event of March 3, 1985, observed on the geoscope and IDA networks: Geophysical Research Letters, vol. 13, p. 1015-1018.

Pardo, M., D. Comte, and A. Eisenberg, 1986, Secuencia sismica de Marzo en Chile Central: J. Chilenas Sismol. Ing. Antisismica, No. A-1-A- 15 (in Spanish).

Saragoni, R., Gonzales, P., and Fresard, M., 1985, Analisis de los accelerogramas del terremote del 3 de Marzo de 1985: Santiago, Chile, Universidad de Chile Departamento de Ingenieria Civil Publicacion SES I 4/1984 (199), 90 p. (in Spanish).

Servicio National de Geologia y Mineria, 1982, Mapa Geologico de Chile, Hoja No. 3 de 6, 30 e 34'-37'10' Lat. S. , Scale 1:1,000,000 (in Spanish).

Wyllie, L.A., N. Abrahamson, S. Aroni, B. Bolt, G. Castro, M. Celebi, M. Durkin, L. Escalante, J. Gates, R. Luft, D. McCormick, R. Olsen, A. Schiff, P. Smith, M. Sozen, J. Vallenas, and P. Yanev, 1985, The Chile earthquake of March 3, 1985: Earthquake Spectra, vol. 2, p. 249-512.

DATA AVAILABILITY

A magnetic tape of the processed data described in this report can be obtained from the National Geophysical Data Center in Boulder, Colorado. All requests should be forwarded to:

National Geophysical Data Center/NOAAWorld Data Center-A for Solid Earth Geophysics

325 Broadway, Code E/GC1Boulder, CO 80303

ACKNOWLEDGEMENTS

The record processing described in this report was funded jointly by the U.S. Nuclear Regulatory Commission, the U.S. Office of Foreign Disaster Assistance (through AID), and the U.S. Geological Survey. Dr. Kausel's participation was partially supported by project FONDECYT-CHILE 88-1186. The accelerograms were kindly provided by the Department of Geology and Geophysics, University of Chile; the Empresa Nacional de Electricidad (ENDESA); and CHILECTRA. Bonny Askew provided computer programming support during the initial phases of the study. The records were digitized by Dean Yanacito.

TABLE

1

Stat

ion

Loca

tion

s an

d Site Conditions

00

Recording

Stat

ion

Cauq

uene

s

Col bu

n

Cons

titu

ci6n

Hualane

Iloca

Los

Vilo

s

Meli

pill

a

Pichilemu

Quin

tay

Rape

l

San

Fernando

San

Isid

ro

Sant

iago

Lati

tude

CS)

36.0

0

35.7

2

35.3

0

34.9

7

34.9

2

31.9

2

33.68

34.3

8

33.20

34.0

3

34.6

0

32.9

0

33.4

5

Long

itud

eCW)

72.22

71.43

72.32

71.8

2

72.22

71.5

0

71.2

2

72.02

71.68

71.58

71.00

71.27

70.67

Structure

2-story

bldg.

Tunn

el

2-story

bldg

.

1-st

ory

bldg.

1-story

bldg.

1 -st

ory

bldg.

1-story

bldg

.

1-story

bldg.

Small

shel

ter

Tunnel

1-st

ory

bldg

.

1-story

bldg.

6-story

bldg.

Location

Grou

nd level

Subg

rade

Grou

nd level

Grou

nd level

Grou

nd level

Grou

nd level

Grou

nd le

vel

Grou

nd level

Grou

nd le

vel

Subg

rade

Grou

nd le

vel

Grou

nd le

vel

Basement

JU

Site Ge

olog

y

Quaternary alluvium

Olig

.-Mio. volcanics

Pale

ozoi

c in

trus

ives

Quaternary alluvium

Quat

erna

ry al

luvi

um

Triassic se

dime

nts

Quaternary al

luvi

um

Pale

ozoi

c metamorphics

Paleozoic

intrusives

Pale

ozoi

c intrusives

Quaternary alluvium

Quat

erna

ry alluvium

Quaternary alluvium

_ **

Ow

ner

DDG

ENDESA

DDG

DDG

DDG

DDG

DDG

DDG

ENDESA

ENDESA

DDG

ENDESA

ENDESA

TABLE

1 (Continued)

Stat

ion

Loca

tion

s an

d Si

te Conditions

CD

Recording

Stat

ion

Ventanas

Zapa

llar

Lati

tude

rs)

32.7

5

32.5

7

Long

itud

eno 71.49

71.47

Structure

6-st

ory

bldg

.

1-story

bldg.

Loca

tion

Grou

nd le

vel

Grou

nd level

ft Site Geology

Quaternary alluvium

Juarassic

intrusives

fftf

Owner

CHIL

ECTR

A

DDG

ft*rServicio

National de

Ge

olog

ia y Mi

neri

a (1982)

DDG:

St

atio

ns ow

ned

by th

e Department of

Ge

olog

y an

d Geophysics,

University of

Chile

ENDE

SA:

Stations owned

by the

Empr

esa

Naci

onal

de El

ectr

icid

adCHILECTRA: Stations owned

by CH

ILEC

TRA

TABLE 2

Instrument Characteristics

Recording Instrument Station Type

Cauquenes

Colbtin

Constitucion

Hualane

Iloca

Los Vilos

Melipilla

Pichilemu

Quintay

Rapel

SMA-1

SMA-1

SMA-1

SMA-1

SMA-1

SMA-1

SMA-1

SMA-1

SMA-1

RFT-250

Component Sensitivity (mm/s)

North-South Vertical East-West

Longitudinal Vertical Transverse









18.5 19.5 18.0

18.8 17.8 18.7

17.3 17.6 16.9

17.7 17.7 17.4

17.5 18.2 19.8

18.4 18.9 19.6

19.0 18.5 21.2

18.1 16.8 19.1

17.2 19.2 19.8

37.4 35.6 36.2

Natural Damping Frequency (%)

(Hz)

25.6 25.4 25.7

25.8 25.8 25.3

25.6 26.1 27.0

25.9 25.6 26.3

25.7 26.3 24.7

25.4 25.6 25.2

25.0 26.0 25.0

26.4 26.5 25.5

26.2 24.8 25.1

17.8 19.0 18.3

57.9 60.3 60.0*

60.0* 60.0*

60.0*

58.5 58.5 61.5

63.8 63.8 60.3

60.6 63.3 60.0

58.5 61.5 61.2

62.3 57.7 59.4

58.8 58.5 58.2

60.0* 60.0*

60.0*

60.0*

60.0 60.0*

10

TABLE 2 (Continued)

Instrument Characteristics

RecordingStation

San Fernando

InstrumentType

SMA-1

Component

North-SouthVerticalEast-West

Sensitivity(mm/£)

18.416.918.0

NaturalFrequency

(Hz)

25.927.725.6

Damping(%)

67.460.863.8

San Isidro

Santiago

PK-130

PK-130

LongitudinalVerticalTransverse

LongitudinalVerticalTransverse

61.3-980.7 61.3-980.7 61.3-980.7

****

61.3-980.7 61.3-980.7 61.3-980.7

****

Ventanas

Zapallar

SMA-1 North-SouthVerticalEast-West

SMA-1 North-SouthVerticalEast-West

17.817.417.5

19.618.316.9

25.0 it

25.025.0*

25.225.826.9

62.660.459.3

60.364.058.5

Estimated

Automatic gain ranging

11

TABLE

3

Summ

ary

of Ground Motion

Data

ro

Recording

Epicentral

Stat

ion

Dist

ance

(k

m)

Cauq

uene

s 319.1

Colb

un

289.

2

Cons

titu

cion

24

3.4

Hualane

203.

2

Iloc

a 20

0.2

Los

Vilo

s 13

9.8

Highcut

Filt

er

Limi

t (H

z)

15.0

17.0

12.0

22.0

28.0

21.0 9.0

19.0 9.0

19.0

28.0

21.0

18.0

35.0

18.0

20.0

22.0

20.0

Lowc

ut Filter

Component

Limi

t (sec)

2.7

2.2

3.3

3.0

2.8

4.3

4.0

4.0

4.5

3.4

2.8

4.0

2.8

3.0

3.0

2.4

2.8

2.9

Nort

h-So

uth

Vertical

East

-Wes

t

Longitudinal

Vert

ical

Tran

sver

se

Nort

h-So

uth

Vert

ical

East-West

Nort

h-So

uth

Vert

ical

East-West

Nort

h-So

uth

Vertical

East-West

North-South

Vert

ical

East-West

Peak Accel

. (c

m/se

c^)

Uncorr.

Corr.

81.9

43.3

112.3

54.3

33.8

41.2

132.7

40.6

79.6

173.

294

.5136.5

207.

090

.9275.7

36.9

19.5

25.8

84.3

41.2

110.

7

47.8

29.6

44.1

127.9

38.9

78.5

167.

183

.413

3.5

221.3

85.3

272.

9

33.9

19.8

24.5

Peak

Ve

l.

(cm/

sec)

6.05

2.74

8.61

7.07

2.81

5.26

17.8 4.12

7.96

11.4 5.75

11.0 9.34

5.70

15.1 2.85

2.26

2.83

Peak Disp.

(cm)

0.710

0.38

41.

16

1.35

0.488

1.51

2.63

0.565

1.68

1.51

1.18

2.39

1.10

1.20

1.37

0.41

10.437

0.487

TABLE

3 (Continued)

Summary

of Gr

ound

Mo

tion

Da

ta

Recording

Epic

entr

al

Station

Dist

ance

(km)

Meli

pill

a 85.2

Pichilemu

138.

4

Quin

tay

18.9

Rapel

102.

4

San

Fernando

181.0

San

Isidro

58.2

Highcut

Filt

er

Limit

(Hz)

22.0

32.0

24.0

23.0

22.0

27.0

30.0

32.0

30.0

17.0

26.0

17.0

23.0

37.0

22.0

25.0

25.0

25.0

Lowc

ut Fi

lter

Co

mpon

ent

Limit

(sec)

7.5

3.7

5.0

6.0

5.0

5.8

4.0

3.5

4.6

6.5

3.8

5.0

4.0

3.0

5.1

5.0

2.6

5.5

North-South

Vert

ical

East

-Wes

t

North-South

Vertical

East-West

Long

itud

inal

Vertical

Tran

sver

se

Nort

h-So

uth

Vert

ical

East

-Wes

t

North-South

Vertical

East

- West

Long

itud

inal

Vert

ical

Transverse

Peak A

ccel .

(cm/

sec^

) Un

corr

. Co

rr.

641.

6274.

3509.

8

259.

7122.

1183.

6

231.

5162.

9240.

3

226.

263.3

89.5

275.

112

1.2

329.

8

711.

6*41

6.1

686.

3

673.

024

9.9

518.1

254.1

119.

317

5.3

231.5

180.

9255.0

219.2

61.3

87.6

285.1

119.1

332.8

706.8

393.3

696.0

Peak V

el.

(cm/sec)

34.2

11.8

40.3

11.7 5.84

12.5

12.5 6.08

19.3

10.4 4.29

6.06

24.5 9.03

23.9

43.2

19.8

43.4

Peak Di

sp.

(cm)

12.0 2.81

6.03

3.74

1.86

4.08

2.80

1.19

3.50

3.14

0.890

1.71

4.23

2.02

5.51

6.91

1.69

5.54

TABL

E 3

(Continued)

Summary

of Ground Motion

Data

Recording

Epicentral

Station

Distance

(km)

Santiago

117.1

Ventanas

56.0

Zapa

llar

73

.5

Highcut

Filter

Limit

(Hz)

30.0

30.0

30.0

18.0

30.0

19.0

20.0

20.0

20.0

Lowc

ut Fi

lter

Component

Limit

(sec

)

3.0

3.2

4.5

5.0

3.3

4.5

1.8

1.5

2.4

Longitudinal

Vertical

Tran

sver

se

Long

itud

inal

Vert

ical

Tran

sver

se

North-South

Vert

ical

East-West

Peak A

ccel.

o(c

m/se

c*)

Unco

rr .

121.6

96.3

118.9

206.

517

6.0

228.0

285.3

210.1

296.6

Corr.

124.

094.6

119.6

208.

917

3.4

223.

0

265.

119

1.0

298.5

Peak V

el.

(cm/sec)

11.7 4.77

14.1

23.3 7.10

24.6

11.2 5.20

13.5

Peak

Disp.

(cm)

1.21

0.91

3.40

3.88

1.20

4.60

1.14

0.479

1.69

Orig

inal

trace

was

off

scale

and

was

reconstructed

to es

tima

te the

peak value

Figure 1 (Overleaf). Map of Central Chile showing the locations of accelerographs that recorded the March 3, 1985 earthquake (circles and squares). The squares represent accelerograms processed in this report. The star and circle mark the NEIC location of the Mg 7.8 mainshock. The two stars mark the NEIC and the Seismological Service, Department of Geology and Geophysics, University of Chile (DGG) locations of the m 5.5 foreshock.

15

73s 72<

Uj

O

O

33'

34*

0JLLAPEL \

39*

PAPUDo

VENTANAS'

LOS VILOS

)LA LIGUA IZAPALLAR

V

xX

r SAN FELICE

LLAY LLAY \ BSAN ISIDRO SALADl'qtO

CIVINA DEL MAR

~ ALMENDRALQUINTAY

LLOLLEOBMELIPILLA

SANTIAGO

PICHILEMU

SAN FERNANDO"

ILOCABHUALANE

CONSTITUCION TALCA

EL

BCAUQUENES

gCHILLAN NUEVA. ^CHILLAN VIE JO (

or

O

16

APPENDIX

Processed Strong-Motion Data

17

SUMMARY OF STRONG-MOTION RECORD PROCESSING

Central Chile earthquake, 3/3/85 22:47:07 UTC, M -7.8

o

Cauquenes, Chile

DESCRIPTION

Instrument Characteristics:

Frequency (Hz)

Damping (% Critical)

Filter Parameters:

Highcut (Hz)

Lowcut (Hz)

Peak Parameters:

Peak Acceleration, -Unc. (cm/s/s)

Peak Acceleration, A (cm/s/s)

Peak Velocity, V (cm/s)

Peak Displacement, D (cm)

Parameter Ratios:

V/A| (sec)

|AD/V2 |

COMPONENT

North-South Vertical

25.6 25. 4

57.9 60.3

15.0 17.0

0.370 0.455

81.9 -43.3

84.3 -41.2

6.05 -2.74

-0.710 0.384

0.072 0.067

1.6 2.1

East-West

25.7

60.0*

12.0

0.300

112.3

110.7

-8.61

-1 .16

0.078

1.7

Nominal Value

A-l

z-v

SCALED INSTRUMENTRESPONSE

J. CM/SEC/SEC -

SCALED INSTRUMENT RESPONSE CM/SEC/SEC _>

oo

SCALED INSTRUMENT RESPONSE

i CM/SEC/SEC a, r_ to b b

m

crmxO

tnmf!: 5* °

mp^rn.

tn

8-V


CM/SEC/SEC -

SCALED INSTRUMENT RESPONSE CM/SEC/SEC ^


i CM/SEC/SEC «tO N)b bl______!_______I

-0 m

*5-*e°

£§5 <= * ;>

r»2

mzj i/>mf

OJo

D=U1=C?=ra^m ^mi cn-^pn

Blcol^r^^ -r^n tooori

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TED

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VE

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1TY

, AN

D D

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LAC

EM

EN

T 2

00

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SP

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CH

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E&

.. 3/3

/85,

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22

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DISPLACEMENTVEL0CITY CM/SEC

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n

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DISPLACEMENT CM

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.. 3/3

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TRA

L C

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3/3

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. 22:4

7:0

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-7.8

CA

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, V

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T10N

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TRA

L C

HIL

E E

Q.,

3/3

/85,

22

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:07

UTC

, M

S-7

.8C

AU

QU

EN

ES

, C

HIL

E,

EA

ST

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ca ca

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MP

LITU

DE

SP

EC

TRU

M 0

F A

CC

ELE

RA

T10N

C

EN

TRA

L C

HIL

E E

Q.,

3/3

/85,

22:4

7:0

7 U

TC,

MS

-7.8

CA

UQ

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CH

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, N

0RT

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(£.

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1012

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0 1

ro

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-n

m co oc m2n

no ts"D

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SI-V


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rno

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 3/3/85, 22:47:07 UTC, MS-7.8

CAUQUENES, CHILE, N0RTH-S0UTH 0,2,5,10,20 PERCENT CRITICAL DAMPING

CJ LU CO

21 CJ

LU CO

Q_ CO LU

>- J

CJ

I LU

CD

0.04

\/x><\/ \

0.1 0.2 0.4 124 10

UNDAMPED NATURAL PERI0D-SEC0NDS

A-16


CAUQUENES, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

uLJ CO

U iLJ CO~z.SI CL CO LU

CJ S3_ I LU

CD SI

0.04 0.1 0.2 0.4 124 10


A-17


CAUQUENES, CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING

uLU CD

Oi

LU

(3 Q_c/>LU

CJ (3 i LU>

CD

0.04 0.1 0.2 0.4 124

UNDAMPED NATURAL PERI0D-SEC0NDS10

A-18

120

100

oLU CO

CO

a.COUJo:>-t

O

RELATIVE VEL0CITY RESP0NSE SPECTRACENTRAL CHILE EQ., 3/3/85, 22:47:07 UTC, MS-7.8

CAUQUENES, CHILE, N0RTH-S0UTH 0,2,5,10,20.PERCENT CRITICAL DAMPING

0.5 1.0 1.5 2.0 2.5 3.0 3 UNDAMPED NATURAL PERI0D-SEC0NDS

7 11 15

A-19

70

60

50oLU CO-V.

oLU en

40

a.COLU

30

o ts_J LU> 20

10

RELATIVE VEL0CITY RESP0NSE SPECTRACENTRAL CHILE EQ., 3/3/85, 22:47:07 UTC, MS-7.8

CAUQUENES, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

RV FAS

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3 UNDAMPED NATURAL PERI0D-SEC0NDS

11 15

A-20

RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 3/3/85, 22:47:07 UTC, MS-7.8

CAUQUENES, CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING

250

200 -

oUl

LU CO

a a.COUJce

o

150 -

100 -


11 15

A-21


Central Chile earthquake of 3/3/85 47:07 UTC, Mg-

Colbun, Chile

22:47:07 UTC, Ms-7.8

DESCRIPTION COMPONENT



Frequency (Hz)


Filter Parameters;

Highcut (Hz)

Lowcut (Hz)

Peak Parameters:

Peak Acceleration, Unc. (cm/s/s)


Peak Velocity,"V (cm/s)


Parameter Ratios:

|V/A| (sec)

|AD/V2 |

25.8

60.<

22.0

0.333

54.3

47.8

-7.07

-1.35

0.15

1.3

25.8

60.

28.0

0.357

0.095

1.8

25.3

60.0'

21.0

0.233

33.8

29.6

2.81

-0.488

-41 .2

44.1

-5.26

1 .51

0.12

2.4

Nominal value

A-22

ss-v

ro b

SCALED INSTRUHENT RESPONSE

CM/SEC/SEC ^

SCALED INSTRUMENTRESP0NSE

CM/SEC/SEC wAb

_____l______I


ti, CM/SEC/SEC 01 01 01 b b I______1______I

m

n:

ISzD

00_

ro_

CO

roo_

m


i CM/SEC/SEC * to 10 b b j

U)


CM/SEC/SEC u


i CM/SEC/SEC o,(X CJlb b

sz-v

DISPLACEMENT CM

VEL0CITY CM/SEC

ACCELERATI0N 1 CM/SEC/SEC ^CD COb b I______i______i

0

m

>m

x

(851

VI I

92-V

DISPLACEMENT CH

VELBCITY CM/SEC

o_

tomn

ena o

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9 8.

Gi

Nl

5-l

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ACCELERATI0N i CM/SEC/SEC ^00 CDb b

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eno_

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CD_

"0rn

c rn en

n o7070m o

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m n* OOfOo o " oen P T3 O P- O

n

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LZ-V

VELOCITY CM/SECtu

CDo

ACCELERATI0N £ CM/SEC/SEC to O Ob b i______i______im

roroc m50

m o

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93

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ss?

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roCD.

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DISPLACEMENT 6 CHVELBCm

CM/SECACCELERATION CM/SEC/SEC

r-m, -

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ip4k.IDn2

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6Z -V

DISPLACEMENT CM

VEL0CITY CM/SEC

ACCELERATI0N i. CM/SEC/SEC ^ ui en b b 1______j______i

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00

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DISPLACEMENT CMui

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VEL0CITY CM/SEC

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ACCELERATI0N 1 CM/SEC/SEC >. ca en b b i______!______I

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EQ

., 3/3

/85.

22

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UTC

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CH

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EQ

., 3

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5,

22:4

7:0

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C0L

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. L0

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CH

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EQ

.. 3/3

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22:4

7:0

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. V

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LITU

DE

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0F

AC

CE

LER

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CE

NTR

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CH

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EQ

., 3/3

/85,

22:4

7:0

7 U

TC,

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-7.8

C0L

BU

N.

CHIL

E".

TRA

NS

VE

RS

E

C0M

PU

TIN

G 0

PT

10N

S-

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0SS

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0IS

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OJ

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u UJ r

u UJ

Q H-

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LL U.

ca to

ca

10

FRE

QU

EN

CY

, HZ

1520

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 3/3/85, 22:47:07 UTC, Ms-7.8

C0LBUN, CHILE, L0NGITUDINAL 0,2,5,10,20 PfeRCENf CRITICAL DAMPING

UJ CO

CJI

UJ CO

QL CO UJo:

CJ

_I UJ>CD

0.04 0.1 0.2 0.4 124 10


A-37

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EGL 3/3/85, 22:47:07 UTC, Ms-7.8

C0LBUN, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

CJ UJ CO \2:CJ

UJ COzIS) Q_ CO UJo:

CJ IS) I UJ

CD IS)

-1

0.04 0.1 0.2 0.4 124 10


A-38


C0LBUN, CHILE, TRANSVERSE 0,2,5,10,20 PERCENT CRITICAL DAMPING

uLJ CO^x

2:CJ

illCO

CL CO LJ

CJs I UJ>CD

0.04 0.1 0.2 0.4 124 10

UNDAMPED NATURAL PERIOD-SECONDS

A-39

RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 3/3/85, 22:47:07 UTC, Ms-7.8

C0LBUN, CHILE, L0NGITUOINAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

100

80 -

LUco

il COzSIQ_toUJct:

u


11 15

A-40


C0LBUN, CHILE. VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING


7 11 15

A-41


C0LBUN, CHILE, TRANSVERSE 0,2,5,10,20 PERCENT CRITICAL DAMPING


11 15

A-42


Central Chile earthquake, 3/3/85 22:47:07 UTC, Ms»7.8

Constitucion, Chile

DESCRIPTION


Frequency (Hz)


Filter Parameters:

Highcut (Hz)

Lowcut (Hz)

Peak Parameters:





Parameter Ratios:

|V/A| (sec)

lAD/V2

COMPONENT


25 . 6 26 . 1

58.5 -58.5

9.0 19.0

0.250 0.250

-132.7 -40.6

-127.9 38.9

-17.8 -4.12

2.63 0.565

0.14 0.11

1.1 1.3

East-West

27.0

61 .5

9.0

0.222

79.6

78.5

7.96

1.68

0.10

2.1

A-43


A CM/SEC/SEC eo o o b o


CM/SEC/SEC ^

SCALED INSTRUMENT RESP0NSE

CM/SEC/SEC -

-omo >(S T^Z.^ts>r> < im£~:z

RS? RS" Qzo

oo

(Jl ' 00°>%

tf)

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A-61


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A-63


Central Chile earthquake, 3/3/85 22:47:07 UTC, Ms-7.8

Hualane, Chile




Frequency (Hz)


Filter Parameters:

Highcut (Hz)

Lowcut (Hz)

Peak Parameters;

Peak Acceleration, Unc. (ctn/s/s)




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|V/A| (sec)

|AD/V2 |

25.9

63.8

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0.294

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0.068

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A-81


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A-82


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A-83

RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 3/3/85, 22:47:07 UTC. Ms-7.8

HUALANE, CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING

160 r

140 E


7 11 15

A-84


Central Chile earthquake, 3/3/85 22:47:07 UTC, M3»7.8

Iloca, Chile

DESCRIPTION


Frequency. (Hz)


Filter Parameters:

Highcut (Hz)

Lowcut (Hz)

Peak Parameters:


Peak Acceleration, A (cai/s/s)

Peak Velocity, V (cin/s)


Parameter Ratios:

|V/A| (sec)

|AD/V2 |

COMPONENT


25.7 26.3

60.6 63-3

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0.357 0.333

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9.34 5.70

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A-100


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7 11 15

A-103


IL0CA, CHILE. VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING


7 11 15

A-104

RELATIVE VEL0CITY RESP0NSE SPECTRACENTRAL CHILE EQ., 3/3/85, 22:47:07 UTC, Ms-7.8

IL0CA, CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING

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7 11 15

A-105


Central Chile earthquake, 3/3/85 22:47:07 UTC, Ms»7.8

Los Vilos, Chile

DESCRIPTION

North-South


Frequency (Hz) 25.4

Damping (% Critical) 58.5

Filter Parameters:

Highcut (Hz) 20.0

Lowcut (Hz) 0.417

Peak Parameters:

Peak Acceleration, Unc. (cm/s/s) 36.9

Peak Acceleration, A (cm/s/s) 33.9

Peak Velocity, V (cm/s) -2.85

Peak Displacement, D (cm) -0.411

Parameter Ratios:

V/A| (sec) 0.084

|AD/V2 . 1.7

COMPONENT

Vertical

25.6

61 .5

22.0

0.357

19.5 -

19.8

-2.26

0.437

0.11

1.7

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25.2

61 .2

20.0

0.345

25.8

24.5

2.83

0.487

0.12

1 .5

A-106

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A-117

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 3/3/85. 22:47:07 UTC, Ms-7.8

L0S VIL0S, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

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A-118


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A-119


L0S VIL0S, CHILE, N0RTH-S0UTH 0,2,5,10,20 PERCENT CRITICAL DAMPING


11 15

A-120

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0.0 0.5 1.0 1.5 2.0 2.5 3.0 7 11 15UNDAMPED' NATURAL PERI0D-SEC0NDS

A-121


L0S VIL0S, CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING


7 11 15

A-122


Central Chile earthquake, 3/3/85 22:47:07 UTG, M -7.8

o

Melipilla, Chile

DESCRIPTION


Frequency (Hz)


Filter Parameters:

Highcut (Hz)

Lcwcut (Hz)

Peak Parameters:


Peak Acceleration, A (cm/s/s) "



Parameter Ratios:

V/A (sec)

AD/V2

COMPONENT


25.0 26.0

62.3 57.7

22.0 32.0

0.133 0.270

-641.6 27^.3

-673.0 -249.9

34.2 -11.8

12.0 -2.81

0.051 0.047

6.9 5.0

East-West

25.0

59.4

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0.200

509.8

518.1

40.3

6.03

0.078

1.9

A-123


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MELIPILLA, CHILE, N0RTH-S0UTH 0,2,5,10,20 PERCENT CRITICAL DAMPING

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A-138


MELIPILLA, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

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A-139


MELIPILLA, CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING

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A-140

500

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MELIPILLA, CHILE, N0RTH-S0UTH 0,2,5,10,20 PERCENT CRITICAL DAMPING

RV FAS


7 11 15

A-141


MELIPILLA, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

120


11 15

A-142

500


MELIPILLA, CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING

0.5 1.0 1.5 2.0 2.5 3.0 3 7 11 15 UNDAMPED NATURAL PERI0D-SEC0NDS

A-143



Pichilemu, Chile

DESCRIPTION

North-South


Frequency (Hz) 26.4

Damping (% Critical) . 58.8

Filter Parameters:

Highcut (Hz) 23.0

Lowcut (Hz) 0.167

Peak Parameters:

Peak Acceleration, Unc. (cm/s/s) 259.7

Peak Acceleration, A (cm/s/s) 254.1

Peak Velocity, V (cm/s) -11.7

Peak Displacement, D (cm) 3.74

Parameter Ratios:

|V/A| (sec) 0.046

|AD/V2 | 6.9

COMPONENT

Vertical

26.5

58.5

22.0

0.200

-122.1

-119.3

-5.84

-1.86

0.049

6.5

East-West

25.5

58.2

27.0

0.172

-183.6

-175.3

12.5

4.08

0.071

4.6

A-144


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PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EGL, 3/3/85, 22:47:07 UTC, Ms-7.8

PICHILEMU, CHILE, N0RTH-S0UTH 0,2,5,10,20 PERCENT CRITICAL DAMPING

uUJ

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LJ CO

CL CO LJ

u I UJ>CD

0.04 0.1 0.2 0.4

UNDAMPED NATURAL

124 10 PERI0D-SEC0NDS

A-159


PICHILEMU, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

ollJ

CJiLU CO

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0.04 0.1 0.2 0.4 124 10


A-160


PICHILEMU. CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING

cjLd CO \z:cj iLd CO

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A-161

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PICHILEMU, CHILE, N0RTH-S0UTH 0,2,5,10,20 PERCENT CRITICAL DAMPING


7 11 15

A-162

70

60

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50

40

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10


PICHILEMU, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

RV FAS

0.0 0.5 1.0 ;, 1.5 2.0 2.5 3.0 3 UNDAMPED NATURAL PERI0D-SEC0NDS

11 15

A-163


PICHILEMU, CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING

100

oUJ CO

oUJen

a.Crt

cc

u(SI


11 15

A-164


Central Chile earthquake, 3/3/85 .22:47:07 UTC, Ms-7.8

Quintay, Chile

DESCRIPTION


Frequency (Hz)


Filter Parameters:

Highcut (Hz)

Lowcut (Hz)

Peak Parameters:





Parameter Ratios:

|V/A (sec)

|AD/V2 |

COMPONENT


26.2 24.8 25.1

60.0* 60.0* 60.0*

30.0 32.0 30.0

0.250 0.286 0.217

231.5 -162.9 -240.3

231.5 180.9 255.0

12.5 -6.08 -19.3

2.80 -1.19 -3-50

0.054 0.034 0.076

4.1 5.8 2.4

Nominal Value

A-165

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CM/SEC/SEC Mo

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22

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2025

30


QUINTAY, CHILE, TRANSVERSE 0,2,5,10,20 PERCENT CRITICAL DAMPING

CJ LU

U tLU COzS3 Q. CO LU

CJ S3 _ I LU

CDS3

0.04 0.1 0.2 0.4 124 10


A-180


QUINTAY, CHILE, L0NGITUOINAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

uLU CO

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0.04 0.1 0.2 0.4 124 10 UNDAMPED NATURAL PERI0D-SEC0NOS

A-181


QUINTAY. CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

cjLU CO

CJ i

Lul CD

Q_ CD'UJ

>-I

CJ

LU

CD


A-182

uLU CO

120

100

80

LU CO

a.COLUce

u siLU>

60

40

20


QUINTAY, CHILE, L0NGITUDINAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

RV FAS


11 15

A-183


QUINTAY, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING


11 15

A-184

160

140 :

120 ~-

31 Oill (/>z si o_ (ftUJcc

o sUJ>

100 '

VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 3/3/85, 22:47:07 UTC, Ms-7.8

QUINTAY, CHILE, TRANSVERSE 0,2,5,10,20 PERCENT CRITICAL DAMPING


11 15

A-185


Central Chile earthquake of 3/3/85 47:07 UTC, MS «

Rapel, Chile

22:47:07 UTC, Ms-7.8


North-south Vertical East-west


Frequency (Hz)


Filter Parameters:

Highcut (Hz)

Lowcut (Hz)

Peak Parameters:





Parameter Ratios:

V/A (sec)

AD/V2

Nominal Value

17.8

60.0'

17.0

0.154

0.047

6.4

19.0

60.0 :

26.0

0.263

0.070

3.0

18.3

60.0*

17.0

0.200

226.2

219.2

-10.4

-3.14

63-. 3

61.3

-4.29

.890

89.5

87.6

6.06

-1.71

0.069

4.1

A-186

181-V


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22

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RV FAS

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A-206


Central Chile earthquake, 3/3/85 22:47:07 UTC, M3»7.8

San Fernando, Chile

DESCRIPTION


Frequency (Hz)


Filter Parameters:

Highcut (Hz)

Lowcut (Hz)

Peak Parameters:




Peak Displacement, D (cm) »

Parameter Ratios:

|V/A| (sec)

|AD/V2

COMPONENT


25.9 27.7

67.4 60.8

23.0 37.0

0.250 0.333

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285.1 119.1

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11 15

A-227


Central Chile earthquake of 3/3/85 22:47:07 UTC, M--7.8

3

San Isidro (San Pedro), Chile



Instrument Characteristics;

Frequency (Hz)


Filter Parameters:

Highcut (Hz)

Lowcut (Hz)

Peak Parameters;





Paramet er Rat i os:

|V/A| (sec)

|AD/V2 |

25.0

0.200

0.061

2.6

25.0

0.380

0.050

1.7

25.0

0.180

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43.2

6.91

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1.69

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5.54

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A-228

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A-243


SAN ISIDR0, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

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A-244


SAN ISIDR0, CHILE, TRANSVERSE 0,2,5,10,20 PERCENT CRITICAL DAMPING

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A-245

1000

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SAN ISIDR0, CHILE, L0NGITUDINAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

CM


7 11 15

A-246

250

200

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SAN ISIDR0, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

150 -

100 -

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7 11 15

A-247


SAN ISIDR0, CHILE, TRANSVERSE 0,2,5,10,20 PERCENT CRITICAL DAMPING

1200


7 11 15

A-248


Central Chile earthquake of 3/3/85 22:47:07 UTC,' Mg-7.8

ENDESA Building (Basement), Santiago, Chile



Instrument Characteristics;

Frequency (Hz)


Filter Parameters:

Highcut (Hz)

Lcwcut (Hz)

Peak Parameters;





Parameter Ratios:

|V/A| (sec)

|AD/V2 I

30.0

0.330

121.6

124.0

11.7

1 .21

0.094

1 .1

30.0

0.310

96.3

94.6

4.77

0.914

0.050

3.8

30.0

0.220

118.9

119.6

14.1

-3.40

0.12

2.0

A-249

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3/3

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22

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UTC

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2 4

6 8

10

12

14

16

18

20

22

24

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34

33

38

40

42

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12

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CH

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EQ

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22

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UTC

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PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRACENTRAL CHILE ECU 3/3/85, 22:47:07 UTC, Ms-7.8

ENDESA BUILDING (BSMT), SANTIAG0, CHILE, L0NGITUDINAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

a LUCO

o iLJ CO

CL CO LU

CJs I UJ>CD

0.04 0.1 0.2 0.4 124 10


A-264

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRACENTRAL CHILE EQ., 3/3/85, 22:47:07 UTC, Ms-7.8

ENDESA BUILDING (BSMT), SANTIAG0, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

uLU CO>x.

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CD


A-265

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRACENTRAL CHILE EQ., 3/3/85. 22:47:07 UTC, Ms-7.8

ENDESA BUILDING (BSMT), SANTIAG0. CHILE, TRANSVERSE 0,2,5,10,20 PERCENT CRITICAL DAMPING

uUJen

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UNDAMPED NATURAL PERI00-SEC0NDS20

A-266


ENDESA BUILDING (BSMT), SANTIAG0, CHILE, L0NGITUDINAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

140

120 :

100 :

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11 15

A-267


ENDESA BUILDING (BSMT), SANTIAG0, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

100

oUl CO

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7 11 15

A-268


ENDESA BUILDING (BSMT), SANTIAGO, CHILE, TRANSVERSE 0,2,5,10,20 PERCENT CRITICAL DAMPING

140 r

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0.5 1.0 1.5 2.0 2.5 3.0 3UNDAMPED'NATURAL PERI0D-SEC0NDS

11 15

A-269



Ventanas, Chile

DESCRIPTION


Frequency (Hz)


Filter Parameters:

Highcut (Hz)

Lowcut (Hz)

Peak Parameters:





Parameter Ratios:

|V/A (sec)

|AD/V2 |

COMPONENT

Longitudinal Vertical

-

25.0* 25.0*

62.6 60.4

18.0 30.0

0.200 0.303

-206.5 -176.0

-208.9 173.4

-23.3 -7.10

-3.88 -1.20

0.11 0.041

1.5 4.1

Transverse

25.0*

59.3

19.0

0.222

228.0

223.0

-24.6

-4.60

0.11

1.7

Nominal Value

A-270

m-v


CH/SEC/SEC


CM/SEC/SEC


CM/SEC/SEC ,0 o

enm n QoCO

m7cm ..zn < 4m

QQo

,1 «om

m% m

ZLZ-V


CM/SEC/SEC w


i CM/SEC/SEC - CD 00 O P


CM/SEC/SEC o

s 2: s:

o_ >J 10

OD_

00if) * m o «'

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CD_

s: §: o-10.5'j».O"

CD_CD O CD N)

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21

s:

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m

3Qo w!

cnson

ZLZ -V

DISPLACEMENT CM

COo

VEL0CITY CM/SEC

ACCELERATI0N CM/SEC/SEC ,0

o

COm n

oCO

O

SI

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m tn

n n

o

m n

n

P>m

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CO13

COCO 00n

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DISPLACEMENT CM

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30

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10

18

20

22

2*

26

28

30

32

34

36

38

40

42

44

46

48

50

52

54I I

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58

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25.0

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14

16

18

20

22

24

26

28

30

32

34

36

38

40

42

44

46

48

50

52

54

56

58

60

4.70

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6

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12

14

16

18

20

22

24

26

28

30

32

34

36

38

40

42

44

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50

52

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58

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DISPLACEMENT CM

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A-285


VENTANAS, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

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A-286

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRACENTRAL CHILE EQ., 3/3/85, 22:47:07 UTC, Ms-7.8

VENTANAS,CHILE, TRANSVERSE 0,2,5,10,20 PER£ENT CRITICAL DAMPING

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A-287


VENT ANAS, CHILE, L0NGITUDINAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

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A-288


VENTANAS, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

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11 15

A-289

RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ.. 3/3/85, 22:47:07 UTC, Ms-7.8

VENTANAS, CHILE, TRANSVERSE 0,2,5,10.20 PERCENT CRITICAL DAMPING

1200


11 15

A-290


Central Chile earthquake, 3/3/85 22:47:07 UTC, M^-7.8o

Zapallar, Chile

DESCRIPTION


Frequency (Hz)


Filter Parameters:

Highcut (Hz)

Lowcut (Hz)

Peak Parameters:

Peak Acceleration, Unc. (cm/s/s).




Parameter Ratios:

V/A| (sec)

AD/V2 |

COMPONENT


25.2 25.8 26.9

60.3 64.0 ' 58.5 '

20.0 20.0 20.0

0.556 0.667 0.417

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-265.1 191.0 298.5

-11.2 5.20 13.5

1.14 -0.479 -1.69

0.042 0.027 0.045.

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A-291

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ZAPALLAR, CHILE, N0RTH-S0UTH 0,2,5,10,20 PERCENT CRITICAL DAMPING

UJ CO

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0.04 0.1 0.2 0.4 124 10 UNDAMPED NATURAL PERIOD-SECONDS

A-306


ZAPALLAR. CHILE. VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

oLJ 01

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0.04 0.1 0.2 0.4 124 10


A-307


ZAPALLAR, CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING

uLU CO

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0.1 0.2 0.4 124 10 UNDAMPED NATURAL PERI00-SEC0NDS

A-308

200

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ZAPALLAR, CHILE, N0RTH-S0UTH 0,2,5,10,20 PERCENT CRITICAL DAMPING

RV FAS

0.0 0.5 1.0 JL.5 2.0 2.5 3.0 3 UNDAMPED NATURAL PERI0D-SEC0NDS

11 15

A-309

80

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ZAPALLAR, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

RV FAS

0.0 . 0.5 1.0 1.5 2.0 2.5 3.0 3 UNDAMPED NATURAL PERI0D-SEC0NDS

11 15

A-310


ZAPALLAR, CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING

160 r

140 E


11 15

A-311

u.s. geological survey · department of the interior u.s. geological survey processed strong-motion...

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