u.s. geological surveynine accelerograph sites owned by chilectra, endesa, and the department of...

DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

Processed Strong-Motion Data for the Central Chile Aftershock of April 9, 1985:Nine 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 90-46

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. 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. u

Denver, Colorado

1990

CONTENTS

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

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

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

References ........................................................... 5

Data Availability .................................................... 6

Acknowledgements ..................................................... 6

Appendix Processed Strong-Motion Data .............................. 13

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

Constitucion ................................................... A-18

Iloca .......................................................... A-35

Quintay ........................................................ A-52

Rapel .......................................................... A-69

San Fernando ................................................... A-86

Santiago (ENDESA Building) .................................... A-103

Santiago (DGG Building) ....................................... A-124

Ventanas ...................................................... A-141

PROCESSED STRONG-MOTION DATA FOR THE CENTRAL CHILE AFTERSHOCK OF APRIL 9, 1985:NINE ACCELEROGRAPH SITES OWNED BY CHILECTRA,

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

INTRODUCTION

The April 9, 1985 (Ms =7.2) earthquake that occurred off the coast of central Chile is known to have triggered at least 10 accelerographs located throughout the region (Fig. 1). This report presents processed records from 9 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 site owned by the Department of Engineering, University of Chile, are presented by Celebi (1987). This event was the largest aftershock of the March 3, 1985 (Ms =7.8) earthquake that occurred near Valparaiso. Strong-motion data recorded during the mainshock, including processed records from 26 sites, are available in Saragoni et al. (1985), Wyllie et al. (1985), Celebi (1987), and Campbell et al. (1989). A general description of the effects of the March 3 mainshock are given by Algermissen et al. (1985) and Wyllie et al. (1985).

The aftershock occurred at 01:57 UTC on April 9, 1985. The U.S. National Earthquake Information Center (NEIC) located the epicenter near the coast of central Chile approximately 12 km south of the Rapel accelerograph site (Fig. 1). NEIC reported several people injured and some damage (Modified Mercalli Intensities of about VI) in the Santiago- Valparaiso area. The earthquake was felt throughout much of central Chile from La Serena to Osorno. It was also felt (IV) in Mendoza, Argentina, as well as in San Juan, San Luis, Cordoba, Tucuman, and Santa Fe Provinces, Argentina.

NEIC reported the following data for the earthquake:

Earthquake Parameters:

Origin Time: 01:56:59.4 UTCLocation: 34.131'S, 71.618'WDepth: 38 kmMagnitude: 6.3 m& . 7.2 MSMoment: 6.1x1026 dyne-cm (7.2

Preferred Fault Plane:

Strike: 343'Dip: 23°Slip: 90°

P-axis:

Azimuth: 253 s Plunge: 22 s

The focal mechanism is poorly controlled, and corresponds to thrusting of the Nazca plate beneath the continent of South America. This mechanism is consistent with that determined for the mainshock,

RECORDING SITES AND INSTRUMENTATION

The locations of all accelerographs that are known to have recorded the earthquake are indicated on Figure 1. The squares identify the 9 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 two of the recording sites were equipped with Kinemetrics SMA-1 strong-motion accelerographs. The exceptions were Santiago (ENDESA building), which housed a Katsujima PK-130 accelerograph, 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 the recording sensitivity, natural frequency, and damping are 19 mm/#, 25 Hz, and 60 percent of critical, respectively, for the SMA-1 accelerographs. The RFT-250 accelerograph is a one-half g full scale instrument, with sensitivities roughly a factor of two higher than those associated with the SMA-1 recorders. 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-mm 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 recording, it was 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/sec" (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 record. 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. There were no fixed traces on the accelerogram obtained at Ventanas, so only the acceleration traces and timing marks were digitized for this record. Timing marks were written every 0.5 sec on the film records and every 0.1 sec on the paper 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. The sensitivity of the Santiago (Univ. of Chile) accelerograph was not known; therefore, its sensitivity was taken as the average sensitivity of all SMA-1 accelerographs whose instrument parameters were known at the time of this report (Campbell et al. t 1989).

Phase II (Corrected Time 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 this 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 applied.

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 all traces were unpadded to obtain corrected acceleration, velocity, and displacement.

Phase III and IV. Fourier amplitude spectra (FAS) and response spectra in the form 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.

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 55-542, 180 p.

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.

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.

Saragoni, R., Gonzales, P., and Fresard, M., 1985, Analisis de los accelerogramas del terremoto 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 8 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 89-1132. 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

Station

Locations

and

Site

Conditions

Reco

rdin

g Latitude

Stat

ion

(°S)

Cauq

uene

s

Constitucion

Iloca

Quin

tay

Rape

l

San

Fern

ando

Sant

iago

(ENDESA

Bldg.)

Santiago

(DGG Bl

dg.)

Ventanas

36.0

0

35.30

34.92

33.2

0

34.0

3

34.60

33.4

5

33.4

7

32.75

Longitude

rw)

72.22

72.32

72.2

2

71.68

71.58

71.00

70.6

7

70.6

7

71.4

9

Stru

ctur

e

2-st

ory

bldg.

2-st

ory

bldg.

1-st

ory

bldg

.

Smal

l shelter

Tunn

el

1-st

ory

bldg.

6-story

bldg

.

3-st

ory

bldg.

6-st

ory

bidg

.

Location

Ground level

Ground le

vel

Ground level

Grou

nd level

Subg

rade

Ground level

Base

ment

Basement

Ground le

vel

itSi

te Geology

Quat

erna

ry al

luvi

um

Paleozoic

intrusives

Quaternary alluvium

Paleozoic

intrusives

Pale

ozoi

c intrusives

Quat

erna

ry al

luvi

um

Quaternary alluvium

Quat

erna

ry al

luvi

um

Quaternary al

luvi

um

left

Owner

DGG

DGG

DGG

ENDESA

ENDE

SA

DGG

ENDE

SA

DGG

CHIL

ECTR

A

ft*

Serv

icio

National de

Geologia y Mi

neri

a (1

982)

DGG:

Stations owned

by the

Depa

rtme

nt of

Ge

olog

y and

Geophysics,

University of

Chile

ENDE

SA:

Stations ow

ned

by the

Empr

esa

Naci

onal

de El

ectr

icid

adCH

ILECTRA: Stations ow

ned

by CH

ILEC

TRA

TABLE 2

Instrument Characteristics

Recording Station

Cauquenes

Constitucion

Iloca

Quintay

Rapel

San Fernando

Santiago (ENDESA)

Santiago (U.C.)

Instrument Type

SMA-1

SMA-1

SMA-1

SMA-1

RFT-250

SMA-1

PK-130

SMA-1

Component

North-South Vertical East-West



Longitudinal Vertical Transverse




Longitudinal Vertical

Sensitivity

18.5 19.5 18.0

17.3 17.6 16.9

17.5 18.2 19.8

17.2 19.2 19.8

37.4 35.6 36.2

18.4 16.9 18.0

61.3-980.7** 61.3-980.7** 61.3-980.7**

18.3*

18.3*

Natural Frequency

(Hz)

25.6 25.4 25.7

25.6 26.1 27.0

25.7 26.3 24.7

26.2 24.8 25.1

17.8 19.0 18.3

25.9 27.7 25.6

25.0*

25.0

Damping

57.9 60.3, 60.0*

58.5 58.5 61.5

60.6 63.3 60.0

60.0* 60.0*

60.0*

60.0*

60.0 60.0*

67.4 60.8 63.8

60.0*

60.0*

Ventanas SMA-1

Transverse

North-SouthVerticalEast-West

18.3'

17.817.417.5

25.0'

25.0' 25.0:

25.0'

60.0'

62.660.459.3

'Estimated

**Automatic gain ranging

8

TABLE

3

Summary of Ground Mo

tion

Data

CO

Recording

Stat

ion

Cauquenes

Cons

titu

cion

J lo

ca

Quin

tay

Rape

l

San

Fern

ando

Epicentral

Dist

ance

(k

m)

214.7

144.

9

103.

6

103.

5

11.8

77.1

High

cut

Filt

er

Limit

(Hz)

13.0

18.0

11.0 9.5

9.5

9.5

19.0

31.0

20.0

25.0

35.0

25.0

15.0

25.0

20.0

25.0

35.0

25.0

Lowc

ut Fi

lter

Li

mit

(sec)

1.9

1.4

1.9

3.0

1.2

3.0

3.3

3.3

4.0

1.5

1.5

3.0

5.7

3.4

5.7

4.0

2.7

2.7

Comp

onen

t

North-South

Vert

ical

East-West

North-South

Vert

ical

East-West

North-South

Vert

ical

East

-Wes

t

Longitudinal

Vert

ical

Transverse

Nort

h-So

uth

Vertical

East-West

North-South

Vertical

East-West

Peak Ace

(cm/

sec

Unco

rr.

55.2

38.0

72.3

50.2

25.0

44.2

162.5

53.8

111.5

30.1

20.7

24.2

51.0

48.2

105.7

60.2

44.9

64.2

el.

2)

Corr

.

54.3

37.1

72.7

48.3

24.4

43.1

158.7

56.2

110.1

31.5

18.4

22.3

49.7

44.8

107.

8

60.7

42.8

65.0

Peak Ve

l.

(cm/sec)

3.86

2.00

4.62

4.80

1.86

3.52

8.88

3.06

8.89

1.31

1.31

1.86

5.21

2.78

6.70

3.98

2.11

3.63

Peak

Disp.

(cm)

0.28

30.

173

0.43

7

0.845

0.137

0.746

0.76

30.

654

1.38

0.14

30.

141

0.630

2.18

0.55

33.

40

1.11

0.52

70.478

TABLE

3 (Continued)

Summ

ary

of Ground Mo

tion

Da

ta

Reco

rdin

g Epicentral

Stat

ion

Distance

(km)

Santiago

115.9

(ENDESA)

Santiago

114.

5(D

GG)

Ventanas

153.

8

High

cut

Filter

Limi

t(Hz)

30.0

30.0

30.0

26.0

26.0

27.0

17.0

15.0

17.0

Lowc

ut Fi

lter

Component

Limi

t(sec)

3.0

3.2

4.5

2.7

2.0

2.7

3.1

1.7

2.0

Long

itud

inal

Vert

ical

Tran

sver

se

Long

itud

inal

Vertical

Tran

sver

se

Longitudinal

Vertical

Transverse

Peak

Accel.

s\

(cm/

sec

Uncorr.

32.9

16.8

21.2

40.4

29.4

34.4

67.7

35.3

75.0

*) Corr.

32.5

17.3

20.8

38.7

24.9

33.2

66.9

30.9

73.8

Peak

Ve

l.(c

m/se

c)

3.99

1.47

2.18

4.29

1.11

2.39

8.38

2.54

6.58

Peak

Disp.

(cm)

1.23

0.91

40.

581

0.907

0.15

80.

480

1.26

0.40

31.

18

Figure 1 (Overleaf). Map of Central Chile showing the known locations of accelerographs that recorded the April 9, 1985 aftershock (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 of March 3; the star marks the NEIC location of the Mg 7.2 aftershock.

11

SAN FERNANDO"

1LOCA

12

APPENDIX

Processed Strong-Motion Data

13

SUMMARY OF STRONG-MOTION RECORD PROCESSING

Central Chile earthquake, 4/9/85 01:56:59 UTC, M s=7.2

Cauquenes, Chile

DESCRIPTION

North-South

Instrument Characteristics:

Frequency (Hz) 25.6

Damping (% Critical) 57.9

Filter Parameters:

Highcut (Hz) 13.0

Lowcut (Hz) 0.526

Peak Parameters:

Peak Acceleration, Unc. (cm/s/s) 55.2

Peak Acceleration, A (cm/s/s) 54.3

Peak Velocity, V (cm/s) -3.86

Peak Displacement, D (cm) -0.283

Parameter Ratios:

|V/A| (sec) 0.071

|AD/V2 | 1.0

COMPONENT

Vertical

25.4

60.3

18.0

0.714

-38.0

-37.1

2.00

0.173

0.054

1.6

East-West

25.7

60.0*

11.0

0.526

-72.3

-72.7

4.62

0.437

0.064

1 .5

Nominal value

A-l

z-v

SCALED INSTRUMENTRESP0NSE

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PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EG.. 4/9/85, 01:56:59 UTC, Ms-7.2

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

oLU CO

cjILU COzSI CL CO LU

CJ IS)_J UJ

CD SI

0.04 0.1 0.2 0.4 124 10 UNDAMPED NATURAL PERI0D-SEC0NDS

A-12

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 4/9/85, 01:56:59 UTC, Ms-7.2

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

uUJ CO

CJ

LJto

Q.toUJ

CJ (S i LU

CD (S

-1


A-13


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

uUJ

0I

LU

ISCLCOLU

>- » cj I LU>

CD


A-14

RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 4/9/85, 01:56:59 UTC, Ms-7.2

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

11 15

A-15


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

20

15

oUJcn

oUJto

1 10COUJ

>- » o

UJ>

RV FAS

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3 7 11 15 UNDAMPED NATURAL PERI0D-SEC0NDS

A-16

100

oLUto x.

z: oiLCO

Q_ CO UJce

o

LU>

80

60

40

20

RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EG)., 4/9/85, 01:56:59 UTC, Ms-7.2

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

RV FAS


A-17


Central Chile earthquake, 4/9/85 01 :56:59 UTC, M g=7.2

Constitucion, Chile

DESCRIPTION


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 26.1

58.5 58.5

9.5 9.5

0.333 0.833

-50.2 -25.0

48.3 -24.4

-4.80 1.86

-0.845 -0.137

0.099 0.076

1.8 1.0

East-West

27.0

61.5

9.5

0.333

44.2

43.1

-3.52

-0.746

0.082

2.6

A-18

61-V


1 CM/SEC/SEC A 01 a b o


& CM/SEC/SEC M ui at b b


CM/SEC/SEC ,

-3(0x^*0

- mn

aip.p

00

m en

oz-v

DISPLACEMENT CM

VEL0CITY CH/SEC

ACCELERATION JL CM/SEC/SEC ^O «Do b 0

m

m in

7070m n

2>

§?§> - zo

in

ob uin

<nT) CO

IZ-V

DISPLACEMENT CH

VELOCITY CM/SEC

8

ACCELERATION & CM/SEC/SEC w 01 01b b

"-

Cflm o Q§ B. (/)

8L.

m

c-S>n S o o.-. m rn° - z>

oo -if- 2

Cflm na "Sen o- s oCD </)

a)n

o o.N) O.

-v

OISPLACEHENT CM

VELOCITY CH/SEC

ACCELERATION CM/SEC/SEC ^

F0U

RIL

R A

MP

LITU

DE

SP

EC

TRU

M 0

F

AC

CE

LER

AT1

0N

CE

NTR

AL

CH

ILE

EG

)., 4

/9/8

5.

01

:56

:59

UTC

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S-7

.2C

0NS

TIT

UC

I0N

, C

HIL

E,

N0R

TH

-S0U

TH

C

0MP

UTI

NG

0P

TI0

NS

- Z

CR

0SS

,SM

00T

H(3

),N

0N0I

SE

to co

L0G

0F

FR

EQ

UE

NC

Y,

HZ

F0U

RIE

R A

MP

LITU

DE

SP

EC

TRU

M 0

F A

CC

ELE

RA

TI0

N

CE

NTR

AL

CH

ILE

EQ

., 4

/9/8

5.

01

:56

:59

UTC

, M

S-7

.2C

0N

ST

lfUd0N

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HIL

E,

VE

RT

ICA

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00T

H(3

).N

0N0I

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CM

to

O HI (/) ^ o UJ

Q Q. r a: UJ a: u.

u, to

L0G

0F

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EQ

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NC

Y,

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F0U

RIE

R A

MP

LITU

DE

SP

EC

TRU

M 0

F

AC

CE

LER

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I0N

C

EN

TRA

L C

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Q..

4/9

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1:5

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(3),

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to Ol

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CO £ O UJ

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0 1T T

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4/9

/85,

01:5

6:59

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0N0I

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01

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ts o IS

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10


C0NSTITUCI0N, CHILE, N0RTH-S0UTH 0,2,5,10,20 PERCENT CRITICAL DAMPING

uLU CO

CJ

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O. CO Ld

CJQ _j LU>

CD


A-29

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 4/9/85. 01:56:59 UTC, Ms-7.2

C0NSTITUCI0N, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRlflCAL DAMPING

uLJ V)

CJ i

LJ O)

LJo:

LJ>

CD

0.04 0.1 0.2 0.4 124 10

UNDAMPED NATURAL PERI0D-SEC0NDS

A-30


C0NSTITUCI0N. CHILE, EAST-WE§T 0,2,5,10,20 PERCENT CRltlCAL DAMPING

uLJ CO

CJ i

LU CO

CL CO LUo:

CJ IS_ I UJ

CD 13

0.04 0.1 0.2 0.4 124 10


A-31

RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ-, 4/9/85, 01:56:59 UTC, Ms-7.2

C0NSTITUCI0N.CHILE, N0RTH-S0UTH 0,2,5,10,20 PERCENT CRITICAL DAMPING

100

uLU CO

CO

1CO UJ (X

ucaLU>


11 15

A-32

20

15

oLUcn

LUcn

I 10 cn LU a:

oIS)


C0NSTITUCI0N, 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-33


C0NSTITUCI0N, CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING

50

40

oUJen

30

en

o_ enUJo:£ 20i i o

10

RVC" A C r AO


11 15

A-34


Central Chile earthquake, 4/9/85 01:56:59 UTC, Ms=7.2

Iloca, Chile

DESCRIPTION


Frequency (Hz)


Filter Parameters:

Highcut (Hz)

Lowcut (Hz)

Peak Parameters:





Parameter Ratios:

V/A| (sec)

AD/V2

COMPONENT


25.7 26.3

60.6 63.3

19.0 31.0

0.303 0.303

-162.5 -53.8

-158.7 -56.2

-8.88 3.06

0.763 0.654

0.056 0.054

1.5 3.9

North-South

24. 7

60.0

20.0

0.250

-111.5

-110.1

8.89

-1 .38

0.081

1.9

A-35

92-V


JL CM/SEC/SEC -

P Pin

SCALED INSTRUMENT RESP0NSE

CM/SEC/SEC


CM/SEC/SEC -

om

mm

zs-v

DISPLACEMENT CM

VELOCITY CM/SEC

ACCELERAJ10N CM/SEC/SEC -

8S-V

SCD

DISPLACEMENT CM

VEL0CITY CM/SEC

ACCELERATI0N CM/SEC/SEC

TJm

fj>Cm to

873;o m o

O)>m~

CO

m O

O ^ (f) S

ro

tn ^n P>i 3 m

00CO

10M.

n

m no1 4

in

pb uin

roro o pb oU) o en

co__

68-V

DISPLACEMENT CM

VELOCITY CM/SEC


"Dm

i- O C G>m TOin TO

m> o

"m

o Po

to m pS "o to o

7 8± W

8 3n

F0U

RIE

R A

MP

LITU

DE

SP

EC

TRU

M 0

F A

CC

ELE

RA

T10N

C

EN

TRA

L C

HIL

E E

Q.,

4/9

/85

, 01

:56:

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TC,

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-7.2

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ILE

, N

0RTH

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TH

C0M

PU

TIN

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ldN

S-

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00T

H(5

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0N0I

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OJ

4rn

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CO *»> r

o ul

o Q. r Of or u.

u.o

L0G

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EQ

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NC

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F0U

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R A

MP

LIT

UD

E S

PE

CTR

UM

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AC

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LER

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I0N

C

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TRA

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HIL

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Q..

4/9

/85

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IL0C

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IL£,

VE

RT

ICA

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o UJ r

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CH

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EQ

.. 4

/9/8

5.

01

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UTC

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S-7

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EQ

., 4

/9/8

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CH

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EQ

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£, V

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4/9

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01:5

6:59

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1520

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ. f 4/9/85, 01:56:59 UTC, Ms-7.2

IL0CA, CHILE, N0RTH-S0UTH 0,2,5,10,20 PERCENt CRITICAL DAMPING

CJ LUt/) v,^ U

LU

Q 0_

LU

>-

CJSI_i LU

CD SI


A-46


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

oUJ CO\

oI

UJ CO

o_COUJa:

i i_iu is jUJ>CD


A-47

PSEUD0 RELATIVE VELOCITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 4/9/85, 01:56:59 UTC, Ms-7.2

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

U

CO ,\2: o

IUJ CO

Q_enUJ

o(3_i UJ

CD

\yy:/ x x,\

0.04 0.1 0.2 0.4 124 10 20


A-48

120

RELATIVE VEL0CITY RESP0NSE SPECTRACENTRAL CHILE EQ., 4/9/85, 01:56:59 UTC, Ms-7.2

IL0CA, CHILE, N0RTH-S0UTH 0,2,5,10,20 PERCENT CRITICAL DAMPING


7 11 15

A-49

RELATIVE VEL0CITY RESP0NSE SPECTRACENTRAL CHILE EQ. f 4/9/85, 01:56:59 UTC, Ms-7.2

IL0CA, CHILE, VERTICAL 0.2,5,10,20 PERCENT CRITICAL DAMPING


11 15

A-50


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

200RV FAS

150

50


11 15

A-51


Central Chile earthquake, 4/9/85 01:56:59 UTC, Ms=7.2

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

60.0 60.0

25.0 35.0

0.667 0.667

30.1 20.7

-31.5 18.4

-1.31 1.31

0.143 0.141

0.042 0.071

2.6 1.5

East-West

25.1

60.0

25.0

0.333

24.2

22.3

-1.86

0.630

0.083

4.1

A-52

ss-v


CM/SEC/SEC KJ


CM/SEC/SEC

o>


CM/SEC/SEC u

b

O)

on

m

S >'»

noCOm

COm ^>

8L-. - O> O <^"0

O» CO * m

co

CD

DISPLACEMENT

PO)

VELBCITY CM/SEC

ACCELERATI0N £ CM/SEC/SEC w

b bI_______I______I

CO m o

O CO

O>

TJm

m

n

o <s

m

om mo

C10

n

o ^10

KJ 9 r OS °

- S O

00_

22-V

DISPLACEMENT CM

VEL0CITY CM/SEC

ACCELERATI0NCM/SEC/SEC -

<o b

o>

(f)m o cs

en

o>oo

9S-V

DISPLACEMENT CM

VEL0CITY CM/SEC

8

ACCELERAT10N ^ CM/SEC/SEC ,0U) COb b I______I______i

to m n

Ocn

o»

oooooo

F0U

RIE

R A

MP

LIT

UD

E S

PE

CTR

UM

0F

AC

CE

LER

AT1

0N

CE

NTR

AL

CH

ILE

E

Q..

4/9

/85

. 0

1:5

6:5

9.

UTC

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S-7

.2Q

UIN

TA

Y.

CH

ILE

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0RT

H-S

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C0M

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T1N

G 0

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R0S

S,S

M00

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(7),

N0N

0IS

E

CMFc

:» H

'

T Cn

O UJ .

O ul Q Q. o: UJ » i

o: Si u. to

o -

10

15

FRE

QU

EN

CY

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20

25

85-V

L0G 0F F0URIER AMPLITUDE, CM/SEC

0

o

m oc

oru

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m>

sm

6S-V


0

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0 1

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29-V


0 1

f

o

O <S-n-n33m om o

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ.P 4/9/85, 01:56:59, UTC, Ms-7.2

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

uLUco\21 CJ

LU CO

CL CO LU

>-I i iCJ

I LU>

CD

-1

0.04

\/ \/y\\/ \/

0.1 0.2 0.4 124 10 UNDAMPED NATURAL PERI0D-SEC0NDS

A-63

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ.. 4/9/1985, 01:56:59. UTC, Ms-7.2

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

uUJ CO

CJ

UJcn

Q_cnLUon

uIS) I LU>CD

-1


A-64

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 9/4/85, 01:56:59, UTC, Ms-7.2

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

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A-65

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RELATIVE VEL0CITY RESP0NSE SPECTRACENTRAL CHILE EQ., 4/9/85, 01:56:59, UTC, Ms-7.2

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

RV FAS


i i i i

11 15

A-66

RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 4/9/1985, 01:56:59, UTC, Ms-7.2

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

12

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RV FAS

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11 15

A-67

RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 9/4/85, 01:56:59, UTC, Ms-7.2

QUINTAY, 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-68


Central Chile earthquake of 4/9/85 56:59 UTC, MS =

Rapel, Chile

01:56:59 UTC, Ms =7.2

DESCRIPTION COMPONENT


Instrument Characteristics;

Frequency (Hz)


Filter Parameters;

Highcut (Hz)

Lowcut (Hz)

Peak Parameters;





Parameter Ratios:

|V/A| (sec)

AD/V2 |

* Nominal Value

17.8

60.0*

15.0

0.175

0.10

4.0

19.0

60.0'

25.0

0.294

0.062

3.2

18.3

60.0'

20.0

0.175

51.0

49.7

5.21

-2.18

-48.2

-44.8

-2.78

-0.553

-105.7

-107.8

6.70

3.40

0.062

8.2

A-69

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A-80


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

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A-81


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

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

RV

FAS


A-83


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

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RV FAS


A-84


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


A-85


Central Chile earthquake, 4/9/85 01:56:59 UTC, M s=7.2

San Fernando, Chile

DESCRIPTION


Frequency (Hz)


Filter Parameters:

Highcut (Hz)

Lowcut (Hz)

Peak Parameters:





Parameter Ratios:

V/A (sec)

AD/V2

COMPONENT


25.9 27.7

67.4 60.8

25.0 35.0

0.250 0.370

-60.2 -44.9

-60.7 -42.8

-3.98 -2.11

-1.11 -0.527

0.066 0.049

4.3 5.1

East-West

25.6

63.8

25.0

0.370

64.2

65.0

3.63

-0.478

0.056

2.4

A-86

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SAN FERNAND0, CHILE. N0RTH-S0UTH 0,2,5,10,20 PERCENT CRITICAL DAMPING

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A-97

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ-, 4/9/85, 02:56:59 UTC, Ms-7.2

SAN FERNAND0, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

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A-98

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EG., 4/9/85, 01:56:59 UTC, Ms-7.2

SAN FERNAND0, CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING

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A-99


SAN FERNAND0, CHILE. N0RTH-S0UTH 0,2,5,10,20 PERCENT CRITICAL DAMPING

i0.5 1.0 1.5 2.0 2.5 3.0 3

UNDAMPED NATURAL PERI0D-SEC0NDS7 11 15

A-100

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A-101


SAN FERNAND0, CHILE, EAST-WEST 0,2,5,10,20 PERCENT CRITICAL DAMPING


A-102


Central Chile earthquake of 4/9/85 01:56:59 UTC, Ms=7.2

Endesa Bldg. (Bsrat), Santiago, Chile



Instrument Characteristics;

Frequency (Hz)


Filter Parameters:

Highcut (Hz)

Lowcut (Hz)

Peak Parameters:





Parameter Ratios:

|V/A| (sec)

|AD/V2 |

30.0

0.179

0.12

2.5

30.0

0.179

0.085

7.3

30.0

0.179

32.9

32.5

3.99

-1.23

-16.8

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1.47

-0.914

21.2

20.8

2.18

0.581

0.11

2.5

A-103

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TC,

MS

-7.2

E

ND

ES

A B

UIL

DIN

G (

BS

MT)

, S

AN

TIA

G0,

CH

ILE

, V

ER

TIC

AL

C0M

PU

TIN

G 0

PT

I0N

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R0S

S,S

M00

TH

(3),

N0N

0IS

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CM

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o: ZJ

IS

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U.

IS (D

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EQ

UE

NC

Y,

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rn oc m z: o

n m

m>

ro

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RIE

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MP

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DE

S

PE

CTR

UM

0F

AC

CE

LER

AT

I0N

C

EN

TRA

L C

HIL

E E

AR

THQ

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KE

0F

09

AP

R 1

985,

01

:56

:59

UTC

. M

S-

EN

DE

SA

BU

ILD

ING

(B

SM

T),

SA

NT

IAG

0, C

HIL

E,

L0N

GIT

UD

1NA

L C

0MP

UTI

NG

0P

TI0

NS

- Z

CR

0SS

,SM

00T

H(2

0).N

0N01

SE

7.2

Fcl

CM

Ol

O

HI o LJ a or

LU

» i or LL

GJ CD

10

FR

EQ

UE

NC

Y,

HZ

1520

F0U

RIE

R A

MP

LITU

DE

SP

EC

TRU

M 0

F A

CC

ELE

RA

TI0

N

CE

NTR

AL

CH

ILE

EA

RTH

QU

AK

E 0

F 0

9 A

PR

198

5. 0

1:5

6:5

9 U

TC,

MS-

E

ND

ES

A B

UIL

DIN

G (

BS

MT)

, S

AN

TIA

GO

, C

HIL

E.

VE

RT

ICA

L C

0MP

UTI

NG

0P

TI0

NS

- Z

CR

0SS

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00T

H(2

0).N

0N01

SE

7.2

CM

o

111 CO -x.

T. O LJ

O Ct Ul i i ct ID

IS

U. CD

IS

10

FREQ

UENC

Y. HZ

1520

F0U

R1E

R A

MP

LITU

DE

SP

EC

TRU

M 0

F A

CC

ELE

RA

TI0

N

CE

NTR

AL

CH

ILE

EA

RTH

QU

AK

E

0F 0

9 A

PR

1985,

01:5

6:5

9 U

TC.

MS-

E

ND

ES

A B

UIL

DIN

G (

BS

MT)

, S

AN

TIA

G0,

CH

ILE

, TR

AN

SV

ER

SE

C

0MP

UT1

NG

0P

TI0

NS

- Z

CR

0SS

,SM

00T

H(2

0),N

0N01

SE

7.2

CM

U

LU cn V. 2:

u LU

Q I- or

LU 5 ID U.

O

LL CD

I0

10

FRE

QU

EN

CY

, H

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1520

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRACENTRAL CHILE EARTHQUAKE 0F 09 APR 1985, 01:56:59 UTC, Ms-7.2

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

oQJco

u UJco

CL CO UJ

CJ IS i LU

CD

0

-1


A-118


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

UJ CO*v^z:CJ UJ CO 2LsiQ_ CO LU

CJ Q

UJ>

CD

-1


A-119


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

oLU CO

u UJ CO

CL CO UJ

>- h-1 4

CJ

_J UJ

CD S)

-1

0.04

\/>X\/\7


A-120

RE

LA

TIV

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L0

CIT

Y

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SE

S

PE

CT

RA

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TRA

L C

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EA

RTH

QU

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9 A

PR

1985,

01:5

6:5

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TC,

Ms-

7.2

E

ND

ES

A B

UIL

DIN

G (

BS

MT)

, S

AN

TIA

G0,

CH

ILE

, L0

NG

ITU

DIN

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0,2

0 P

ER

CE

NT

CR

ITIC

AL

DA

MP

ING

I

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\

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3 UNDAMPED NATURAL PERI0D-SEC0NDS

7 11

15

to

to

RE

LA

TIV

E

VE

L0

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S

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EN

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9 A

PR

19

85,

01

:56

:59

UTC

, M

s-7

.2

EN

DE

SA

BU

ILD

ING

(B

SM

T),

SA

NT

IAG

0, C

HIL

E,

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85,

01

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UTC

, M

s-7

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EN

DE

SA

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ILD

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(B

SM

T),

SA

NT

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HIL

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0

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EN

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3.

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UN

DA

MP

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N

AT

UR

AL

PE

RI0

D-S

EC

0N

DS

11

15


Central Chile earthquake of 4/9/85 01:56:59 UTC, Ms»7.2

Univ. of Chile (Bsmt), Santiago, Chile




Frequency (Hz)


Filter Parameters;

Highcut (Hz)

Lowcut (Hz)

Peak Parameters:





Parameter Ratios:

|V/A| (sec)

|AD/V2 |

25.0

60.0

26.0

0.370

0.11

1.9

25.0

60.0

26.0

0.500

0.045

3.2

25.0

60.0

27.0

0.370

40.4

38.7

4.29

-0.907

-29.4

-24.9

1.11

-0.158

-34.4

-33.2

2.39

0.480

0.072

2.8

A-124

szi-v


CM/SEC/SEC


CM/SEC/SEC

00

IO


1 CM/SEC/SEC ^ to* -*

b b

m

20

sis ^^ ^^^"

m

C0R

RE

CTE

D A

CC

ELE

RA

TIO

N.

VE

L0C

1TY

, AN

D D

ISP

LAC

EM

EN

T 200.0

0 S

PS

C

EN

TRA

L C

HIL

E E

D..

4/9

/85.

01

:56

:59

UTC

. M

S-7

.2S

AN

T1A

60,

CH

ILE

, L0

NG

ITU

DIN

AL

PE

AK

VA

LUE

S:

AC

CE

L-38

.74

CM

/SE

C/&

C,

VE

L0C

ITY

-4.2

9 C

M/S

EC

, O

lSP

L-0

.91

CM

30.0

-

-30.

0 J

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I ..

2 4

8 8

10

12

14

18

18

20

22

24

28

281 'J 'd

'a-! 'd 'd

'«)

'

to Oi

4.30 -

-4.3

0 J

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

2 4

0 8

10

12

14

18

18

20

22

24

28

28

30

32

34

38

38

0.01

-i

5 UJ

-0.01

i i

i i

i i

i i

i i

i r

i i

i i

i i

i i

i i

i i

i i

j i j

i j

i i

i i

i i

i i

i2

4 0

8 10

12

H

10

18

20

22

24

20

28

30

32

34

30

38

40

SEC0NOS

, C

0RR

EC

TED

AC

CE

LER

AT1

0N.

VE

L0C

1TY

, AN

D D

ISP

LAC

EM

EN

T 200.0

0 S

PS

C

EN

TRA

L C

HIL

E E

&..

4/9

/85.

01

:56

:59

UTC

f M

S-7

.2S

AN

TIA

G0,

CH

ILE

, V

ER

TIC

AL

PE

AK

VA

LUE

S:

AC

CE

L-2

4.8

0 C

M/S

EC

/SE

d, V

EL0C

ITY

-l.il

CM

/SE

C,

OIS

PL-O

.iO C

M

-25.

0I

II

I_J

LI

I_J

lnj

LJ

I_J

I.J

I_J

LJ

I J

2 4

0 8

10

12

14

10

18

20

22

24

20

28

30

32

34

30

38

40

to

1.20

-1.2

0I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I I

I 2

4 6

8 10

12

14

10

18

20

22

24

26

28

30

32

34

30

38

40

0.10

i

I u>

5

-0.1

6 -1

I I

I I

I I

I I

I I

I I

I I

I I

I I

t|

| I

| I

| |

I |

I2

4 0

8 10

12

14

10

18

20

22

24

26

28

3d

3

2

34

3(J

38

4

0

SE

C0

ND

S

-V

DISPLACEMENTVEL0CITY CM/SEC


0m

C 7}m ;o</) m

o

8 °3 n m°? z>

U) >m

CO

mZ-o- n>^

>

o o *- S0) H D o7 -.oo </> k T o w n

F0U

RIE

R A

MP

LITU

DE

SP

EC

TRU

M 0

F A

CC

ELE

RA

T10N

C

EN

TRA

L C

HIL

E E

G..

4/9

/85

, 01:5

6:5

9 U

TC.

MS

-7.2

SA

NTI

AG

O.

CH

ILES

L0N

GIT

UD

1NA

I C

0MP

UTI

NG

0P

T10

NS

- Z

CR

0SS

.SM

00T

H(1

0).N

0N0I

SE

Ol

:e v

to to

O UJ in "v o Q Q.

< or UJ

1 4 CL Q LL

O

U. ca o

ea

L0G

0F

FR

EQ

UE

NC

Y.

HZ

081-V

L0G 0F F0URIER AMPLITUDE. CM/SEC

0 1

O

m om o

OOm

1 5 05 Z ac-Oo ~.

O

en- r

1 u> 2 5 s vi> -1 i\"^10.-.

m§

<n

<-

<-

TST-V


0 1

tIT

(9 Q

rn oc m z o

oo313

O

NiOv.cn 0500-0

o O-H

m

ca en 81

F0U

RIE

R A

MP

LITU

DE

SP

EC

TRU

M 0

F A

CC

ELE

RA

T10N

C

EN

TRA

L C

HIL

E E

Q..

4/9

/85

, 01:5

6:5

9 U

TC.

MS

-7.2

SA

NT

IAG

0. C

HIL

ES L

0NG

ITU

D1N

AI

C0M

PU

TIN

6 0P

T10

NS

- Z

CR

0SS

.SM

00T

H(1

0).N

0N0I

SE

cJ'

CO to

o 111

in v.

r

o LJ

Q ID a. r o:

ui U.

O

I

10

15

FRE

QU

EN

CY

. H

Z

20

25

F0U

RIE

R A

MP

LIT

UD

E S

PE

CTR

UM

0F

A

CC

ELE

RA

T10

N

CE

NTR

AL

CH

ILE

EQ

.. 4

/9/8

5.

01

:56

:59

UT

C,

MS

-7.2

SA

NT

1AG

0. C

HfL

E.

VE

RT

ICA

L C

0MP

UT

IN6

0PT

10N

S-

ZC

R0S

S,S

M00

TH

(10)

,N0N

0IS

E

CO

CO

o LU

CO "v.

O UJ o a. r C£ UJ

i i

QC Q

U. U.

I10

15

FR

EQ

UE

NC

Y,

HZ

20

25


0 12-n

C7»

m o

-<

10. O

ro ui

O

ca3-o c

02=00-0

o o-i

imo

j=rrr m

i

m

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EGL 4/9/85, 01:56:59 UTC, Ms-7.2

SANTIA60, CHILE, L0NGITUDINAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

uUJ

UJ

CL V) LUo:

(J(3

CD (3

-1

0.04

\/»\/ \/


A-135

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ.. 4/9/85. 01:56:59 UTC, Ms-7.2

SANTIAG0, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING

CJUJ

uI

UJ

z0.

UJ

>- I-I I

u

UJ

o

-1


A-136

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ.. 4/9/85, 01:56:59 UTC, Ms-7.2

SANTIAG0, CHILE, TRANSVERSE 0,2,5,10,20 PERCENT CRITICAL DAMPING

cjLU if)

(J i

LU

IS) Q_ (/) LU

CJ IS)_i LU

CD (3

-1


A-137

30

25

in20

o

in£15 <nUJce

o2 10UJ

RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 4/9/85, 01:56:59 UTCf Ms-7.2

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

RV FAS


11 15

A-138


SANTIAG0, CHILE, VERTICAL 0,2,5,10,20 PERCENT CRITICAL DAMPING


11 15

A-139


SANTIAG0, CHILE, TRANSVERSE 0,2,5,10,20 PERCENT CRITICAL DAMPING


11 15

A-140


Central Chile earthquake of 4/9/85 01:56:59 UTC, M Q =7.2

£5

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

17.0 15.0

0.323 0.588

-67.7 35.3

-66.9 30.9

-8.38 -2.54

1.26 0.403

0.13 0.082

1.2 1.9

Transverse

25.0*

59.3

17.0

0.500

75.0

73.8

-6.58

-1.18

0.089

2.0

Nominal value

A-141

m-v

DISPLACEMENT J. CM g 8

VELOCITY CM/SEC

gbI


bm>X

10r- °

I I

oo00-

m

p b O)

K)M_

00

8_

00

8L.

10

Or

s 8 3 8

n

b}

m-v


CM/SEC/SEC N


A CM/SEC/SEC w 5 5 b b I______i______i


§ CM/SEC/SEC o>

CDb bI________i______i

oo

oo

o_

10

COoo

0000

TJ m X

Z-H

CO

C3)Z NJ>

or

(033 - 10

m

C0R

RE

CTE

D A

CC

ELE

RA

TIO

N.

VE

L0C

ITY

, AN

D D

ISP

LAC

EM

EN

T 2

00

.00

SP

S

CE

NTR

AL

CH

ILE

E&

., 4

/9/8

5.

01

:56

:59

UTC

, M

S-7

.2V

EN

T A

NA

S,

CH

^LE.

VE

RTI

CA

L P

EA

K V

ALU

ES

: A

CC

EL-

30.8

6 C

M/S

EC

/SE

C,

VE

L0

&T

Y-2

.54

CM

/SE

C,

DIS

PL

-0.4

0 C

M

31.0

-i

|«/y^

^^24

0 8

10

12

14

16

I I

I I

I 30

32

34

-0.4

1 J

'30'

'3

2'

'a,1

SH-V

DISPLACEMENT CM

VEL0CITY CM/SEC


F0U

R1E

R A

MP

LITU

DE

SP

EC

TRU

M 0

F A

CC

ELE

RA

T10N

C

EN

TRA

L C

HIL

E E

Q.,

4/9

/85

. 0

1:5

6:5

9 U

TC.

MS

-7.2

VE

NTA

NA

S.

CH

ILE

, L0

NG

ITU

D1N

XL

C0M

PU

TIN

G 0

PT

I0N

S-

ZC

R0S

S.S

M00

TH

(10)

.N0N

0IS

E

01

O>

O LJ

O)

>» r

o ul

o a: UJ <

or u.

o

u.

0 1

L0G

0F

FR

EQ

UE

NC

Y,

HZ

i i

i i

F0U

RIE

R A

MP

LITU

DE

SP

EC

TRU

M 0

F A

CC

ELE

RA

T10N

C

EN

TRA

L C

HIL

E E

Q.,

4/9

/85.

01:5

6:5

9 U

TC,

MS

-7.2

VE

NT

AN

AS

, D

/IL

E,

VE

RTI

CA

L C

OM

PU

TIN

G 0

PT

10N

S-

ZCR

0SS

,SM

00TH

UO

),N0N

0IS

E

O LU

CO r

o LJ

O 0. r LU a:

L0G

0F

FR

EQ

UE

NC

Y,

HZ

8H-V

C)

m om o


0 1 2

oo 3

o ~

s; o m §

6H-V


0 1

ro _

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m o c

n-<

o>

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3>s20<D

ca" nt/)_O-H

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F0U

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R A

MP

LITU

DE

SP

EC

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M 0

F A

CC

ELE

RA

T10N

C

EN

TRA

L C

HIL

E E

Q.,

4/9

/85

. 0

1:5

6:5

9 U

TC,

MS

-7.2

VE

NT

AN

AS

. C

H^L

E, V

ER

TIC

AL

C0M

PU

TIN

6 0P

T10

NS

- ZC

R0S

S,S

M00

TH(1

0),N

0N0I

SE

CM

01 o

(J LU r o Q D Q. r < ct LU

i i Q: ca

u. u.

ca CD

ca

6 6

FRE

QU

EN

CY

, H

Z

1012

14

F0U

RIE

R A

MP

LITU

DE

SP

EC

TRU

M 0

F A

CC

ELE

RA

TI0N

C

EN

TRA

L C

HIL

E E

GL.

4/9

/85.

01

:56

:59

UTC

. M

S-7

.2V

EN

TAN

AS

, C

HlC

E, T

RA

NS

VE

RS

E

C0M

PU

TIN

G 0

PT

10N

S-

ZCR

0SS

,SM

00TH

UO

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0IS

E

FC>1

co

:

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A-152

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EQ., 4/9/85,-01:56:59 UTC, Ms-7.2

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

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A-153

PSEUD0 RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EG).. 4/9/85, 01:56:59 UTC, Ms-7.2

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

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A-154

120

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RELATIVE VEL0CITY RESP0NSE SPECTRA CENTRAL CHILE EGL, 4/9/85, 01:56:59 UTC, Ms-7.2

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


7 11 15

A-155

35

30

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0.0


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

RV FAS

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

A-156


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

200 RV FAS

150

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11 15

A-157

u.s. geological surveynine accelerograph sites owned by chilectra, endesa, and the department of...

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