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Geological Survey Open-File Report 89-203

STRONG-MOTION DATA FROM THE

PASADENA, CALIFORNIA, EARTHQUAKE

OF DECEMBER 3, 1988

By A.V.Acosta and D.A.Johnson

U. S. Geological Survey

15000 Aviation Blvd, MS 6113

Los Angeles, California 90261

May 1989

CONTENTS

Page

Introduction 1

Acknowledgement 2

Reference 2

ILLUSTRATIONS

Figure 1. Strong-motion station map 3

Figure 2. Accelerograms recorded at:

Los Angeles, 4407 Jasper Street 10

Garvey Reservoir 11

Los Angeles, 1111 Sunset Blvd. 12-14

Whittier Narrows Dam 15,16

Los Angeles, 1100 Wilshire Blvd. 17-21

Los Angeles, Griffith Park Observatory 22

Los Angeles, 1526 N. Edgemont St. 23

Los Angeles Bulk Mail Facility 24

Los Angeles, 2005 N. Highland Blvd. 25

Whittier, 7215 Bright Ave. 26-28

Norwalk, 12400 Imperial Highway 29-31

Norwalk, 12440 Imperial Highway 32-38

Los Angeles, 2055 Avenue of the Stars 39

Los Angeles, Wadsworth VA Hospital 40

Sepulveda Dam 41,42

Sepulveda Canyon 43

Weymouth Filter Plant 44,45

\\

ILLUSTRATIONS

Figure 2. Brea Dam 46,47 (con't)

Sepulveda VA Hospital 48

Jensen Filter Plant 49-51

Long Beach VA Hospital 52-54

San Antonio Dam 55-57

TABLE

TABLE 1. Strong-motion data and peak accelerations 4

C. 1

m

STRONG-MOTION DATA FROM THE PASADENA, CALIFORNIA, EARTHQUAKE

OF DECEMBER 3, 1988

INTRODUCTION

A magnitude (ML) 5.0 earthquake occurred beneath Pasadena, Cali

fornia, at 1138 G.m.t. December 3, 1988. The California Institute

of Technology (CIT) located the epicenter in the downtown area near

Pasadena City Hall. There were no significant aftershocks.

Although the epicenter of this earthquake is only about 12 kilo

meters from the epicenter of the M=5.9 Whittier Narrows earthquake

of October 1, 1987, there is apparently no direct relationship

between the two events. Lucile Jones of the U. S. Geological Sur

vey describes the faulting mechanism of the Pasadena earthquake as

strike-slip as distiguished from the dip-slip (thrust) mechanism

of the Whittier Narrows earthquake. Strong-motion data from the

Whittier Narrows earthquake have been presented in Etheredge and

Porcella (1987).

No major damage was reported from the Pasadena earthquake which was

felt over a six-county area of southern California. Minor damage to

utilities was reported in Pasadena; storefront windows were broken

and merchandise was damaged in South Pasadena (Los Angeles Times,

Dec. 4, 1988).

The earthquake triggered 45 accelerographs at 22 stations in the

National Strong-Motion Instrumentation Network (NSMIN) at epicentral

distances of from 8 to 42 kilometers (fig. 1). These accelerographs

are located at eight U.S. Geological Survey ground sites, four Army

Corps of Engineers dams, four facilities of the Metropolitan Water

District of Southern California, three Veterans Administration hos

pitals, and eight other buildings (table 1). Two of the buildings

have extensive instrumentation: 21 channels at the 32-story JCG

building at 1100 Wilshire Boulevard, Los Angeles; and 27 channels

at the 7-story Bechtel building at 12440 Imperial Highway, Norwalk.

Peak horizontal ground accelerations were largest (0.12g) at two

Los Angeles stations: 4407 Jasper Street (8 kilometers from the

epicenter) and 1111 Sunset Boulevard (13 kilometers from the epi

center). A vertical acceleration of 0.19g was recorded at the

roof of the seven-story 1111 Sunset Boulevard building. Accel

erations of 0.06-O.llg were recorded at the thirteenth floor of

1100 Wilshire Boulevard, Los Angeles (15 kilometers from the

epicenter). Copies of all NSMIN accelerograms are presented

in figure 2.

ACKNOWLEDGEMENT

The acceleration data presented in this report were recorded by

instrumentation owned by the Army Corps of Engineers, Metropolitan

Water District of Southern California, Veterans Administration,

JCG Finance Corporation of America, Bechtel Power Corporation, and

private owners. The U. S. Geological Survey appreciates the assis

tance of all who have allowed the use of their facilities for the

operation of strong-motion instrumentation.

REFERENCE

Etheredge, E., and Porcella, R., 1987, Strong-motion data from the

October 1, 1987 Whittier Narrows earthquake, U. S. Geological Survey

Open File Report 87-616.

MLOUCTVU 0 * It l« JO 24 MLOMCTOtS

Figure 1. Map showing National Strong-Motion Instrumentation Network stations triggered during the Pasadena earthquake. See table 1 for identification of map numbers.

Table 1. Strong-motion data and peak accelerations from the Pasadena, California, earthquake of December 3, 1988 (1138 G.m.t.)

Station owners are Army Corps of Engineers (ACOE); Bechtel Power Corporation (BECH); JCG Finance Corp. of America (JCG); Metropolitan Water District of Southern California (MWD); U. S. Geological Survey (USGS); the Veterans Administration (VA); and owners of buildings required to have accelerographs by ordinance (Code). Stations are listed in order of increasing epicentral distance. Epicentral dis tance is measured from station to epicenter at latitude 34.149°N and longitude 118.135°W. Direction of acceleration is for an upward trace deflection on the accelerogram; vertical component directions are all listed as "up."

Station IdentificationAcceleration

USGSNumbe r(mapnumber

5244(1)

Name( owne r )

)

Los Angeles,4407 Jasper StreetGround (USGS)

Coordinates(lat. °N,long. °W)

34.081, 118.188

EpicentralDistance

(km)

8

Direction(degrees)

130up040

Maximum(g)

0.110.060.12

709 Garvey Reservoir 34.048 10 060 0.10 (2) Abutment (MWD) 118.111 up <0.05

330 0.06872 Los Angeles, 34.067 13 (3) 1111 Sunset Blvd. 118.248

(MWD)Basement 348 0.08

up <0.05 258 0.12

4th floor 348 0.08up <0.05258 0.09.

Roof (8th) 348 <0.05up 0.19

258 <0.05

289 Whittier Narrows Dam (4) (ACOE)

Upstream 34.031 14 152 0.07118.054 up <0.05

062 0.06

Crest 34.020 15 033 0.07118.053 up <0.05

303 0.06

Table 1. Strong-motion data and peak accelerations from the Pasadena, California, earthquake of December 3, 1988 (continued)

usesNumber (map number)

5233(5)

141(6)

742(7)

5129(8)

5259(9)

Station Identification

Name Coordinates Epicentral (owner) (lat. °N, Distance

long. °W) (km)

Los Angeles, 1100 34.052 15Wilshire Blvd. 118.263( JCG/USGS )Basement 3, SE

Basement 3 , NE

Basement 4, NW

Structure Array:Ch. 1 12th floor, northCh. 2 12th floor, northCh. 3 12th floor, southCh. 4 13th floor, northCh. 5 13th floor, northCh. 6 13th floor, southCh. 7 32nd floor, northCh. 8 32nd floor, northCh. 9 32nd floor, southCh. 10 1st floor, northCh. 11 1st floor, northCh. 12 1st floor, south

Los Angeles, 34.118 15Griffith Park 118.299Observatory(USGS)

Los Angeles, 1526 34.098 15N. Edgemont Street, 118.2948th level (Code)

Los Angeles Bulk 33.996 16Mail Facility, 118.162Ground (USGS)

Los Angeles, 2005 34.106 19N. Highland Blvd., 118.3368th level (Code)

Acceleration

Direction (degrees)

298up208

298up208

298up

208

298208208298208208298208208298208208

360up270

090up360

010up280

360up270

Maximum(g)

0.08<0.050.07

0.09<0.050.05

0.08<0.050.06

<0.050.060.070.060.110.07

<0.050.09

<0.050.060.09.0.07

<0.05.<0.050.08

0.090.080.10

0.09<0.050.10

<0.05<0.05<0.05



USGS Name Coordinates Epicentral Number (owner) (lat. °N, Distance (map long. °W) (km) number)

804 (10)

634 (11)

5239 (12)

Whittier, 7215 Bright Ave. (Code) Basement

5th floor

10th floor

Norwalk, 12400 Imperial Highway (USGS/BECH) 4th floor

North ground site

South ground site

Norwalk, 12440 Imperial Highway (USGS/BECH)

North ground site

South ground site

Basement

33.977 20 118.036

33.916 26 118.067

33.917 26 118.067

33.915 26 118.067

33.917 26 118.065

33.915 26 118.066

33.917 26 118.066

Acceleration

Direction (degrees)

180 up

090

180 up

090

180 up

090

090 up 360

090up 360

090 up 360

090 up 360

090 up 360

090 up 360

Maximum(g)

0.08 <0.05 0.06

0.10 <0.05 0.06

0.06 0.06 0.08

<0.05 <0.05 <0.05

<0.05 <0.05 <0.05

CO. 05 <0.05 <0.05.

<0.05 <0.05 <0.05

<0.05 <0.05 <0.05

<0.05 <0.05 <0.05

Table 1. strong-motion data and peak accelerations from the Pasadena, California, earthquake of December 3, 1988 (continued)


USGS Name Number (owner) (map numbe r )

Coordinates (lat. °N, long. °W)

Epicentral Distance

(km)

Acceleration

Direction Maximum (degrees) (g)

5239 Norwalk, 12440 (12) Imperial Highway

5256 (13)

5082 (14)

(USGS/BECH)

StructureCh. 1Ch. 2Ch. 3Ch. 4Ch. 5Ch. 6Ch. 7Ch. 8Ch. 9Ch. 10Ch. 11Ch. 12

StructureCh. 13Ch. 14Ch. 15Ch. 16Ch. 17Ch. 18Ch. 19Ch. 20Ch. 21Ch. 22Ch. 23Ch. 24

>s Angeles)55 Avenue

array 1:7th floor, center5th floor, center2nd floor, center1st floor, centerBasement, east5th floor, west-centerBasement, centerBasement, centerBasement, center30' Downhole, bldg.30' Downhole, bldg.30' Downhole, bldg.

Array 2:7th floor, east5th floor, east2nd floor, east1st floor, east7th floor, center5th floor, center2nd floor, center1st floor, center7th floor, west5th floor, west2nd floor, west1st floor, west

34.056of 118.413

centercentercenter

27

090 090 090 090 360 360up

090 360up 090 360

the Stars, 31st level (Code)

Los Angeles, 34.054 Wadsworth VA Hos- 118.453 pital, North ground site (USGS)

31 325up235

<0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

360360360360360360360360360360360360

320up230

<0.05<0.05<0.05<0.05<0.05Inop.<0.05<0.05<0.05<0.05<0.05.<0.05

<0.05<0.05<0.05

<0.05 <0.05 <0.05



usesNumber (map

Name Coordinates Epicentral (owner) (lat. °N, Distance

long. °W) (km)

Acceleration

Direction (degrees)

Maximum(g)

numbe r )

949(15)

757(16)

5164(17)

951(18)

637(19)

655(20)

Sepulveda Dam(ACOE)Crest

Downstream

Sepulveda Canyon,Spillway roof (MWD)

Weymouth Filter Plant(MWD)Tank top

Ground level

Brea Dam(ACOE)Crest

Left abutment

Sepulveda VAHospital, Ground(VA)

Jensen Filter Plant(MWD)

AdministrationBldg. Basement

34.168118.470

34.167118.469

34.097118.478

34.115117.779

34.114117.778

33.890117.925

33.889117.924

34.249118.475

34.312118.496

31

31

32

33

33

34

34

34

38

054up324

054up324

166up076

017up287

017up287

130up040

130up040

360up270

022up292

<0.05<0.05<0.05

<0.05<0.05<0.05

<0.05<0.050.08

<0.05<0.05<0.05

<0.05<0.05<0.05

0.06<0.050.05

<0.05<0.05<0.05

0.07<0.05<0.05

<0.05<0.05<0.05



USGS Name Coordinates Epicentral Number (owner) (lat. °N, Distance (map long. °W) (km) numbe r )

655 (20)

5106 (21)

287(22)

Jensen Filter Plant (MWD)

Generator Bldg. , Ground

ReservoirRoof

Long Beach VA Hospital (VA)Basement

6th floor

llth floor

San Antonio Dam(ACOE)Crest

Right Abutment

Downstream

34.313 38 118.498

34.309 38118.499

33.778 40 118.118

34.157 42117.676

34.158 42 117.682

34.156 42117.675

Acceleration

Direction (degrees)

022 up 292

022up

292

360up

270

360up 270

360up270

090up 360

090 up 360

090up 360

Maximum(g)

<0.05 <0.05 <0.05

<0.05<0.05 <0.05

<0.05<0.05 <0.05

<0.05<0.05 <0.05

<0.05<0.05 <0.05

0.060.05 0.10.

<0.05 <0.05 <0.05

<0.05<0.05 <0.05

U.S. STRONG-MOTION NETWORK

Station No.5244

34.081*N,

118.188*W

Loa Angeles, 4407 Jasper St.

Ground

SMA

I 1418

(USGS)

EARTHQUAKE OF

3 December 1988

1138 Q.m.t.

Epicentral diatanca

DIRECTION

L 130

V

Up

T 040

CONSTANTS

Sens

. a

1.7

8

cm

/9F

raq.

a 2

5.8

H

ED

amp

. a

0.6

crit

Sen

a.

a 1.7

6

cm

/9F

req.

a 26.0

H

ED

amp

. «

0.6

crit

Sena

Freq

- 1 .7

9a

26.2 HE

8 km

Damp. »

0.6

crit

Film speed

1 cm/aec

MAX. ACCELERATION

0.119

0 .06g

0.129

Fig

ure

2

. C

opie

s o

f N

SMIN

ac

cele

rog

ram

s


Station No.70l

34,048°N,

118 .111°W

Qarvey Reservoir

Abutment

SMA

I 1055

(HWD)

EARTHQUAKE OP

3 December 1988

1138 G.ra.t.

Epicentral distance «

10 km

DIRECTION

L 060°

V

Up

T 330°

CONSTANTS

Sens. «

1.84 cm/g

Preq. «

26.3

IIz

Damp. «

0.55 crit

Sens. «

1.90 cm/g

Preq. «

25.0 Hz

Damp. n

0.57 crit

Sens.

«= 1.90 cm/g

Preq. «

26.3 Hz

Damp.

* 0.57 crit

Pilm speed »

1 cm/sec

MAX. ACCELERATION

0 .10g

<0 .

05g

0 . 06g

Pigure 2. Continued.


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station No.

872

34.067«N,

118.248«W

Los Angeles,. 1111 Sunset Blvd

Basement

SNA

I 1074

(MWD)

EARTHQUAKE OP

3 December 1988

1138 Q.m.t.

Epicentral distance a

13 kn

L 348«

V

Up

T 258°

Sens .

Preq.

Damp .

Sens .

Freq .

Damp .

Sens .

Freq .

Damp .

1.95 cm/g

24.3 HK

0.61 crlt

1.87 cm/g

25.6 He

0.59 crit

1.90 cm/g

25.6 HK

0.61 crit

0 .08g

<0 .

05g

0.12g

Film speed «

1 cm/sec

Figure 2.

Continued.

CO


Station No.T72

34.067*N,

118.248°W

Los Ang«l«a,'1111 Sunset Blvd

4th floor

SNA

I 1075

(NWD)

EARTHQUAKE OP

3 D«c«ab«r 1988

1138 Q.a.t.

Bplc«ntral dlatanc*

DIRECTION

L 348°

V

Up

T 258°

CONSTANTS

Sana .

Praq .

Damp .

Sana .

Fraq .

Damp .

Sana .

Praq .

Damp .

1.80

25.6

0.59

1 .99

25.6

0.57

1 .8

0 25.6

0.57

cm/g

HB

crlt

cm/g

HB

crlt

cm/g

HB

crit

MAX. ACCELERATION

0.08g

<0 .05g

0 .09g

13 km

Film ap««d »

1 cn/a«c

Figure 2. Continued.


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station No.

872

34.067'N,

118.248°W

Los Angelas,' 1111 Sunset Blvd.

Roof (8)

SNA

I 1076

(NWD)

EARTHQUAKE OP

3 December 1988

1138 Q.n.t.


13 km

L 348°

V

Up

T 258°

Sans .

Freq.

Damp.

Sens .

Freq.

Damp.

Sens .

Freq.

Damp.

1.90 cn/g

25.0 He

0.59 crit

1.86 cn/g

25.6 He

0.59 ccit

1.83 ca/g

25.6 He

0.57 crit

<0 .

05g

0.19g

<0 .

05g

Film speed «

1 cm/sec

^A^A

^yyy

lA^

Figure 2.

Continued.


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station No.

2 34.031«N,

118.054°W

Whittier Narrows Daa

Upstream (baB«yard)

SNA

I 376

(ACOE)

EARTHQUAKE OP

3 D«c«mb«r 1988

1138 Q.m.t.

Epic«ntral distance

L 152

V

Up

T 062°

Sana .

Fr«q .

Damp .

S«ns .

Fr«q .

Damp.

S«ns .

Fr«q.

Damp .

1.94 cm/g

25.6 HE

0.59 crit

2.00 cm/g

25.6 HE

0.61 crit

2.00 cm/g

25.0 Hz

0.59 crit

0.07g

<0.05g

0.06g

14 km

Film sp««d m

l cm/s«c

Figure 2.

Continued.

U.S. STRONQ-MOTION NETWORK

Station No.2?9

34.020°N,

118.053°W

Whittier Narrows Dan

Crest

SMA

f 476

(ACOE)

EARTHQUAKE OP

3 December 1988

1138 Q.».t.

Epicentral distance »

15 km

DIRECTION

L 033°

V

Up

T 303°

CONSTANTS

Sena.

* 1.79 cm/g

Preq.

« 26.3 HE

Damp.

« 0.61 crit

Sens. »

1.80 cm/g

Preq.

« 26.3 HE

Damp. »

0.57 crit

Sens .

«

1.85 cm/g

Preq.

« 25.6 HE

Daap.

* 0.59 crit

Pilm speed

« 1 cm/sec

MAX. ACCELCRATZON

0.07g

<0.05g

0.06g

Figure 2.

Continued.


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station No.

5233

34.052«N,

118.263°W

Los Angeles ,

' 1100 Wilshire Blvd

Basement

3 SB

SMA

I 6065

(JCQ/USQS)

EARTHQUAKE OP

3 December 1988

1138:33.1 a.m.t.

(WWVB trigger time)

Epicentral distance -

15 km

L 298

V

Up

T 208°

Sens .

«

1.90 cm/g

Freq.

Damp.

Sens

Preq

Damp

Sens

Preq

Damp

25.3 HE

0.6

crit

1.94 cm/g

25.8 HE

0.6

crit

1.98 cm/g

26.2 HE

0.6

crit

O.OBg

<0 .05g

0 .07g

Pilm speed

1 cm/sec

Pigure

2. Continued.

00


Station No.5233

34.052°N

r 118.263°W

Los Angeles,' 1100 Wilshire Blvd

Basement

3 NE

SNA

| 6064

(JCO/USGS)

EARTHQUAKE OF

3 December 1988

1138:32.9 G.m.t.

(WWVB trigger time)


15 km

DIRECTION

L 298°

V

Up

T 208°

CONSTANTS

Sens .

Freq .

Damp .

Sens .

Freq .

Damp .

a « " «

1.90

25.7

0.6

1.90

25.8

0.6

cm/g

HEcrit

cm/g

H* crit

Sens. -

1.90 cm/g

Freq. -

25.6 HE

Danp.

0.6

crit

Film speed »

1 cm/sec

MAX. ACCELERATION

0.09g

<0.05g

O.OSg

#»w*>

Figure 2.

Continued.


Station No.5233

34.052°N,

118.263«W

LOB Angelas, 1100 Wilahir* Blvd

Bas«m«nt

4 NW

SNA

I 6063

(JCG/USQS)

EARTHQUAKE OF

3 D«c«mb«r 1968

1136 :32 .8

a.m.t.

(WWVB trigger tim«)

Epic«ntral distance «

15 km

DIRECTION

L 298°

V

Up

T 208°

CONSTANTS

S«ns. »

1.88 cm/g

Pr«q

Damp

S«ns

Fr»q

Damp

S«ns

Fr»q

Damp

25.9 He

0.6

crit

2.00 cm/g

25.4 He

0 .6

crit

1.89 cm/g

25.2 HE

0.6

crit

Film sp««d »

1 cm/a«c

MAX. ACCELERATION

0.08g

<0 .

05g

0.069

Figur* 2. Continued.


CM.

DIRECTION

LOCATION

SENSITIVITY

MAX. ACCELERATION

Station No.

5233

34.052«N,

118.263°W

LOB Angeles

1100 Wilshire Blvd.

Structure Array

CRA

1. 270

(JCQS/USQS)

EARTHQUAKE OF

3 December 1988

0 1138 :32.8 a.m.t.

(WWVB trigger time)

1 2 3 4 5 6 7 8 9

10 11 12

298°

208°

208°

298°

208°

208°

298°

208°

208°

298°

208°

208°

12th

1 1 1 1 1 3

2th

2th

3th

3th

3th

2nd

32nd

32nd

1st

1 1

Bt

Bt

floor

floor

floor

floor

floor

floor

floor

floor

floor

floor .

floor ,

floor ,

, north

, north

, south

, north

, north

, south

, north

, north

, south

north

north

south

1 1 1 1 1 1 1 1 1 1 1 1

.73

.70

.66

.83

.80

.78

.78

.74

.78

.77

.74

.78

<0

0 0 0 0 0

<0

0

<0

0 0 0

.OSg

.06g

.07g

.06g

.lig

,07g

.05g

.09g

.OSg

.06g

.09g

.07g


15 km

Film sp««d »

1 cm/sec

[See accelerogram on next page]

Figure 2. Continued

LOB

A

ngele

e

1100 W

ilehir

e

Blv

d.

Str

uctu

re

Arr

ay

CR

A f

270

(JC

GS

/US

GS

)

298'

-2D

8V

208'

298°

.

208'

208'

298°

.

208°

1029

8°

11 12

208°

208°

/ vxv

Pig

ur*

2

. C

on

tin

ued

.

to


Station No.ITl

34.118«N,

118.299°W

Los Angelas] Griffith Park

Ground

RFT-250 B/n 351 (USGS)

EARTHQUAKE OP

3 D«c«Bb«r 1988

1138 G.n.t.

Epicentral distance

DIRECTION

L 360°

V

Up

T 270*

CONSTANTS

15 kn

Sana. a

1.88 cn/g

Fr«q. «

20.6 He

Danp.

0.6

crit

Sans.

1.89 cn/g

Fr«q.

21.5 He

Danp.

0.6

crit

S«na. »

1.90 cn/g

Fraq.

21.7 He

Danp.

0.6

crit

Film sp««d *

1 en/sac

MAX. ACCELERATION

<0.05g

<0.05g

0.08?

Figure 2.

Continued.


Station No.742

34.098°N,

118.294«W

Los Angeles, 1526 N. Edgeaont St

Roof (8)

SNA

I 923

(Coda)

EARTHQUAKE OF

3 December 1968

1138 Q.m.t


15 kn

DIRECTION

L 090°

V

Up

T 360«

CONSTANTS

Sens. a

1.91 ca/g

Freq. a 24.7 Hz

Daap. a 0.6

crit

Sens, a

1.82 ca/g

Freq. a 25.8 Hz

Danp. a 0.6

crit

Sens .

a

1.80 ca/g

Freq. a 25.5 Hz

Danp. a

0 4 6

crit

Film speed a

1 en/sec

MAX. ACCELERATION

0.09g

O.OSg

O.lOg

to CO


to

*>.


Station No.5129

33.996°N,

118.162«W

LOB Angelas .Bulk Hail Facility

Ground

SNA

I 1295

(USQS)

EARTHQUAKE OP

3 Dacenber 1988

1138 Q.m.t.

Epicantral distance a

16 km

DIRECTION

L 010«

V

Up

T 280°

CONSTANTS

Sana .

«

1.80 cn/g

Praq

Da up

25.6 Hz

« 0.6

cri t

Sans .

B

1.86 cn/g

Praq. o

25.6 HE

Danp .

a 0.6

cri t

Sana. =

1.88 cn/g

Praq. =

26.3 Hz

Danp .

B 0.6

crit

Piln speed B

1 cm/sec

MAX. ACCELERATION

0.09g

<0 .

05g

O.lOg

Figura 2.

Continued

n

U.S. STRONG-NOTION NETWORK

Station No.5259

34.106°N,

118.336«W

Los Angeles/

2005 N. Highland Blvd.

Roof

(8 )

SNA

I 2691

(Code)

EARTHQUAKE OP

3 December 1989

1138 Q.«.t.

Epicentral distance

« 19 km

DIRECTION

L 360°

V

Up

T 270°

CONSTANTS

Sens. »

1.69 cn/g

Preq. « 26.4 He

Damp. »

0.6

crit

Sens.

1.79 cn/g

Preq. o

25.7 HE

Damp. »

0.6

crit

Sens. »

1.77 cm/g

Freq. B 26.4 HE

Damp.

« 0.6

crit

Film speed =

1 en/sec

MAX. ACCELERATION

<0.0

5g

<0.0

5g

<0.0

5g

to en

Figure 2.

Continued.


DIRECTION

CONSTANTS

HAX. ACCELERATION

Station No.

8033.977°N,

118.036°W

Whittl«r, 72i5 Bright Av« .

SHA

I 1069

(Cod«)

EARTHQUAKE OF

3 D«c«»b«r 1988

1138 Q.a.t.

Epicvntral diatanc*

L 180°

V

Up

T 090°

S«ns .

a

1.78 cn/g

Fr«q.

= 25.9 Hz

Danp.

0.6

crlt

- 1.89 cn/g

- 25.1 Hz

« 0.6

crlt

- 1.90 cn/g

- 25.1 He

« 0.6

crlt

Fr«q

Danp

S«ns

Fr«q

Danp

0.08g

<0 .

05g

0 .06g

20

kiFlln ap««d *

1 cn/a«c

to

o>

Figur«

2. Continued.


Station No.sol

33.977°N,

118.036°W

Whittiar, 7215 Bright Ava .

5th floor

SMA

I 1070

(Coda)

EARTHQUAKE OF

3 Dacambar 1986

1138 Q.m.t.

Epicantral diatanca a

20 km

DIRECTION

L 180°

V

Up

T 090°

CONSTANTS

Sans. a

1.92 cn/g

Fr»q. a

25.4 He

Damp. a

0.6

crit

Sans. «

1.91 cn/g

Praq. a

25.4 He

Damp. a

0.6

crit

Sana. a

1.80 cn/g

Praq. »

25.6 He

Damp. a

0.6

crit

Piln apaad a

1 en/sac

MAX. ACCELERATION

O.lOg

<0 .05g

0 . 06g

to

Figura 2.

Continuad.


Station No.804

33.977°N,

118.036°W

Whittier,

72.15

Bright Av«.

10th floor

SHA

I 1071

(Cod«)

EARTHQUAKE OF

3 D«c«nb«r 1988

1138 Q.a.t.

Epicentral distance

DIRECTION

L 180°

V

Up

T 090«

CONSTANTS

20 kn

Sana. 1.84 cn/g

Fr«q. - 26.1 HE

Danp.

0.6

crit

S«ns.

1.85 cn/g

Fr«q. - 25.5 HE

Danp. 0.6

crit

S«na. 1.89 cn/g

Praq. - 25.1 HE

Danp. 0.6

crit

Filn ap««d

1 cn/a«c

MAX. ACCELERATION

0.06g

0 . 06g

0 . 08g

to oo

Figur* 2. Continued

to to


Station No.634

33.916«N,

118.067°W

Norwalk, 12400 Imperial Highway

4th floor

SNA

I 425

(USQS/BECH)

EARTHQUAKE OF

3 D«c«ab«r 1988

1138 Q.m.t.

Epicantral distance

26 ka

DIRECTION

L 090°

V

Up

T 360°

CONSTANTS

Sana .

Frwq .

Damp .

Sens

Freq

Damp

1.72 cm/g

26.3 HE

0.57 crit

Sens.

1.99 cm/g

Freq. «

24.3 HE

Damp. m

0.55 crit

1.67 cm/g

26.3 HE

0.57 crit

MAX. ACCELERATION

<0 .

OSg

<0.05g

<0 .OSg

Film speed

1 cm/sec



Station No.631

33.917°W,

118.067»W


North ground »it«

SMA

I 419

(USGS/BECH)

EARTHQUAKE OP

3 Dec«mb«r 1988

1138 O.m.t.

Epicentral distance

26 k»

DIRECTION

L 090°

V

Up

T 360°

CONSTANTS

Sana, a

1.95 cn/g

Tr«q. a

25.0 HE

Danp. a

0.55 crit

S«na.

1.68 cn/g

Freq. a

26.3 Hz

Danp. »

0.57 crit

S«ns.

1.87 cn/g

Freq. a

25.6 HE

Danp. a

0.57 crit

Filn speed

1 en/sec

MAX. ACCELERATION

<0.05g

<0.05g

<0.05g

CO o

rigur* 2.

Continued.

frJ


Sta

tio

n

No.

6~

3l3

3.9

15°N

, 1

18

.06

7°W

Norvalk, 124QO Imperial Highway

South ground site

SNA

I 823

(USQS/BECH)

EARTHQUAKE OP

3 Decenber 1988

1138 G.n.t.

Epicentral distance

26 kn

DIRECTION

L 090°

V

Up

T 360«

CONSTANTS

Damp

1.83 cn/g

Sana .

Freq. -

26.0 He

0 .6

crit

S«ns .

Freq .

Damp .

Sana .

Fraq .

Danp .

» » a a a «

1 .76

25.9

0 .6

1.88

25 .9

0.6

cn/g

HE crit

cn/g

HE crit

NAX. ACCELERATION

<0 .

05g

<0 .05g

<0.05g

Piln spaad a

1 cm/sac

CO

Figura 2.

Continued

U.S. STRONQ-MOTION NETWORK

DIRECTION

CONSTANTS

MAX. ACCELERATION

Station No.

5239

33.917«N,

118.065°W

Norwalk, 124*40 Imperial Highway

North ground ait*

SNA

| 824

(USQS/BECH)

EARTHQUAKE OF

3 D»c«ab«r 1988

1138 :37.4 Q.n.t.

(Corrected TCQ trigger tine)

L 090°

V

Up

T 360

Sens .

Fr tq.

Daap.

S«ns .

Fr«q.

Damp.

S«ns .

Fr«q .

Damp.

1.80 cm/g

26.1 Hz

0.59 crit

1.82 cn/g

25.4 Hz

0.61 crit

1.80 ca/g

26.0 HE

0.59 crit

<0.05g

<0 .

05g

<0.05g

Epicttntral distance

26 km

Film sp*«d a

i ca/s«c

CO to

Figur* 2.

Continued.


Station No.5239

33.915°N,

116.066°W

Norvalk, 12440 Imperial Highway

South ground site

SNA

I 922

(USGS/BECH)

EARTHQUAKE OP

3 December 1988

1138:37.4 G.n.t.

(Corrected TCG trigger time)


26 km

DIRECTION

L 090°

V

Up

T 360°

CONSTANTS

Sens .

Preq .

Damp .

Sens .

Preq.

Damp.

1.85 cm/g

25.3 He

0 .55 crit

1.83 cm/g

26.4 He

0 . 55 crit

Sens. »

1.93 cm/g

Preq. »

25.4 HE

Damp. »

0.53 crit

Pilm speed »

1 cm/sec

MAX. ACCELERATION

<0.05g

<0 .05g

<0.05g

CO

CO

Figure 2.

Continued.

U.S. STRONa-NOTION NETWORK

Station No.5239

33.917°N,

118.066°W


Bas«m«nt

SNA

I 2218

(USQS/BECH)

EARTHQUAKE OP

3 O«c«mb«r 1988

1138 :37.4 O.ra.t.

(Corrected TCQ trigger tin*)

Epictntral distance *

26 kn

DIRECTION

L 090°

V

Up

T 360°

CONSTANTS

S«ns .

Fr«q .

Danp .

S«ns .

Fr«q .

Danp .

8 8 a « a a

1 .76

26.3

0.63

1 .88

25.8

0.62

cm/g

Hzcrit

c»/g

HEcrit

Sens. «

1.71 ca/g

Freq. «

26.4 Hx

Danp. - 0.60 crit

Fil» speed

1 en/sec

NAX. ACCELERATION

<0 .05g

<0.05g

<0 .

05g

CO

Pigur* 2.

Continued.


CH.

DIRECTION

LOCATION

SENSITIVITY

MAX. ACCELERATION

CO en

Station No .

5239

33.917«N,

118.066°W

Norwalk

12440 Imperial Highway

Structure Array

1

CRA

I 127

(USQS/BECH)

EARTHQUAKE OP

3 December 1988

1138:37.3 Q.m.t.

(WWVB trigger tine)

1 2 3 4 5 6 7 8 9

10

090°

090°

090°

090°

360°

360°

up

090°

360°

up

7th floor

5th floor

2nd floor

1st floo r

Basement ,

5th floor

Basement ,

Basement ,

Basement ,

Downhole

, center

, center

, center

, cent* r

east

, west-ctr

center

cente r

cente r

(30' )

,

1 1 1 1 1 1 1 1 1 1

.75

.83

.80

.72

.94

.77

.92

.88

.93

.85

<0 <0 <0 <0 <0 <0 <0

<0 <0

<0

.05g

.05g

.05g

.05g

.05g

.05g

.05g

.05g

.05g

.05g

bldg .

center

11

090°

Downhole

(30' )

,1.91

<0.05g

bldg .

cente r

12

360°

Downhole

(30' )

,1.90

<0.05g

Epicentral distance *

26 km

bldg. cente r

Film speed »

1 cm/sec

(See accelerogram on next page)

Figure 2.

Continued.

Norw

alk

*

12440

Imp

eri

al

Hig

hw

ay

Str

uctu

re

Arr

ay

1

CR

A

#

12

7

(US

GS

/BE

CH

)

090'

090°

CO

5-3

601

090'

360°

10-2

L

12

360°

Fig

ure

2.

Co

nti

nu

ed


CH.

DIRECTION

LOCATION

SENSITIVITY

MAX. ACCELERATION

CO

Station No.

5239

33.917'N,

118.066'W

Norwalk

12440 Imperial Highway

Structure Array

2

CRA

I 128

(USQS/BECH)

EARTHQUAKE OF

3 December 1988

1138t37.3 a.m.t.

(WWVB trigger time)

13 14 15 16 17

18 19 20 21 22 23 24

360°

360°

360°

360*

360*

360«

360°

360°

360°

360°

360°

360°

7th

5th

2nd

1st

7th

5th

2nd

1st

7th

5th

2nd

1st

f loo r ,

f loo

floo

r ,

r ,

floor ,

floor ,

floo

floo

floo

floo

floo

floo

floo

r ,

r, r ,

r ,

r ,

r ,

r,

east

east

east

east

cente r

center

center

cente r

west

west

west

west

1 1 1 1 1 1 1 1 1 1 1 1

.9 .8

5 7

.98

.87

.88

.9 .9 .8 .8 . 8

.9 .8

2 1 5 6 4 1 5

<0 <0 <0 <0 <0

.OSg

.OSg

.OSg

.OSg

.OSg

Inop.

<0 <0 <0 <0 <0 <0

.OSg

.OSg

.OSg

.OSg

.OSg

.OSg

Epic«ntral distance

26 kn

Film speed "

1 cm/sec

(See acc«l«rogram on n«xt page]

Figure 2.

Continued.

Norw

alk

12440

Imp

eri

al

Hig

hway

Str

uctu

re A

rray

2

CR

A

#

128

(USG

S/B

EC

H)

13

-J6

01

!4

360°

15-3

60

1

16-2

60:

CO

00

17-

360

°

19

360°

'

360°

23

36°"

'

Fig

ure

2

. C

onti

nued


Station No.5256

34.056°N,

118.413°W

Loa Angelas;

2055 Avenue of the Stars

Roof (31)

SNA

I 5775

(Coda)

EARTHQUAKE OP

3 December 1988

1138 Q.a.t.

Epicentral distance

DIRECTION

L 320°

V

Up

T 230°

CONSTANTS

Sens .

Freq .

Damp .

Sens .

Freq .

Damp .

Sens .

Freq .

Daap .

a a a a a a a a a

1.66

27.0

0.6

1.89

25.8

0.6

1.78

26.0

0.6

cn/g

He crit

cra/

gHzcrit

cra/

gHz crit

MAX. ACCELERATION

<0.05g

<0.05g

<0.05g

27 ka

Fila speed »

1 cm/sec

CO

CO

Figure

2. Continued.

U.S. STRONQ-HOTZON NETWORK

Station No.5082

34.054°N,

lia.453°W

Los Ang«l«B,' Wadsworth VA Hospital

Ground sit« north

SNA

I 4960

(USQS)

EARTHQUAKE OP

3 D«c«mb«r 1988

1138 :38 .7

a.m.t.

(VfW

VB trigger time)

Epicentral distance

DZRECTZON

L 325«

Up

T 235«

CONSTANTS

s«ns .

Pr«q.

Damp.

1.86 cm/g

26.0 He

0.6

crlt

31 km

S«ns. »

1.98 cm/g

Pr«q. a

25.5 He

Damp. a

0.6

crit

S«ns. a

1.70 cm/g

Pr«q. a

27.0 He

Damp. a

0.6

crit

Pilm sp««d «

1 cm/s«c

MAX. ACCELERATION

<0.05g

<0.05g

<0.05g

Pigur* 2.

Continued


Station No.949

34.168*N,

118.470°W

Sapulvada DAM

Crest

SKA

I 5703

(ACOE)

EARTHQUAKE OP

3 Dacambar 1988

1136 O.m.t.

Epicantral distanca »

31 km

DIRECTION

L 054°

V

Up

T 324°

CONSTANTS

Sans.

*» 1.90 cm/g

Fraq. «

25.8 HE

Damp. a

0.6

crit

Sans .

Fraq .

Damp .

Sans .

Praq .

Daap .

a

a

1 .99

25.1

0 .6

1.88

25. 4

0. 6

cm/g

Hz

crit

cm/g

Hz

crit

MAX. ACCELERATION

<0.05g

<0 .05g

<0 .

OSg

Film spaad

1 cm/sac

Figura 2.

Continuad.


Station No.9*49

34.167°N,

118.469«W

S«pulv«da Dan

Downstr«an

SMA

| 5702

(ACOE)

EARTHQUAKE OF

3 D«c«nb«r 1988

1138 Q.n.t.

Epic«ntral diatanc*

DIRECTION

L 054

V

Up

T 324

CONSTANTS

31 km

S«na. »

1.70 cn/g

Pc«q. » 26.6 HE

Danp. » 0.6

crit

Sana. -

1.85 cn/g

Fr«q. - 25.6 HE

Damp. » 0.6

crit

S«na. -

1.84 cn/g

Fcaq. * 26.0 HE

Danp. « 0.6

ccit

Piln sp««d

1 cn/a«c

MAX. ACCELERATION

<0.05g

<0.05g

<0.05g

to



Station No.757

34.097«N,

118.478«W

Sepulveda Canyon

Spillway roof

SMA

I 1054

(NWD)

EARTHQUAKE OP

3 December 1988

1138 Q.n.t.


32 km

DIRECTION

L 166°

V

Up

T 076°

CONSTANTS

Sens .

Freq .

Damp .

Sens .

Freq .

Damp *

Sens .

Freq .

Damp.

a a

a a

1.84

26.3

0.59

1 .93

25.6

0.59

1.92

25.0

0 .59

cm/g

HE

crit

cm/g

Hz

crit

cm/g

HE

crit

MAX. ACCELERATION

<0.05g

<0.05g

0.08g

Film speed a

1 cm/aec

CO

Figure 2.

Continued.


Station No.5164

34.115 N,

117.779°W

W«ynouth Filter Plant

Tank top

SNA

t 1052

(MWD)

EARTHQUAKE OP

3 D«c«nb«r 1988

1138 G.n.t.

Epicentral distance

DIRECTION

L 017°

V

Up

T 287

CONSTANTS

33 ka

S«ns. »

1.86 cm/g

Fr«q. m 25.5 He

Danp. »

0.6

crit

S«ns. a

1.85 cm/g

Fr«q. m 25.9 He

Danp. a

0.6

crit

S«na. m

1.77 ca/g

Pr«q. a

25.8 HE

Danp.

0.6

crit

Filn ep««d

1 cn/s«c

NAX. ACCELERATION

<0.05g

<0.05g

<0 .

05g



Station No.5164

34.114 N,

117.778-W

Weymouth Filter Plant

Ground level

SNA

1053

(HWO)

EARTHQUAKE OP

3 December 1908

1138 Q.B.t.

Epicentral distance

« 33 km

DIRECTION

L 017°

V

Up

T 287«

CONSTANTS

Sens. -

2.00 cm/g

Preq. -

24.9 Hz

Damp. «

0 . 6

crit

Sens. -

1.83 ca/g

Preq. «

25.9 HE

Damp. «

0.6

crit

Sens. *

1.88 cm/g

Preq. «

26.3 HE

Damp. «

0.6

crit

Film speed -

1 cm/sec

MAX. ACCELERATION

<0 .05g

<0 *05g

<0.05g

01



Station No.

33.890°N,

Brea Dan

Crest

SMA

386

EARTHQUAKE OF

951

117.925°W

(ACOE)

3 December 1988

1138 Q.n.t.

Epicentral distance

34 kn

DIRECTION

L 130°

V

Up

T 040°

CONSTANTS

Sens .

Freq .

Danp .

Sens .

Freq .

Danp .

Sens .

Freq .

Danp .

- 1.93

-24.4

- 0.55

1.88

25.0

- 0 .55

- 1.85

25.6

-0.53

cn/g

HE

crit

cu/g

Hz

crit

cn/g

Hz

crit

MAX. ACCELERATION

0.06g

<0 .05g

0.0 5g

Filn speed «

1 en/sec

Oi



Station No.9TI

33.889«N,

117.924°W

Braa Dan

Laft abutment

SNA

I 365

(ACOE)

EARTHQUAKE OF

3 December 1988

1138 a.m.t.

Epicantral distanca

« 34 km

DIRECTION

L 130°

V

Up

T 040°

CONSTANTS

Sans .

«»

1.90 cm/g

Praq. «

25.9 He

Damp.

* 0.6

crit

Sans.

« 2.02 ca/g

Praq. «

24.8 Ha

Da op .

» 0.6

crit

Sans .

«

1.95 cm/g

Fraq.

« 25.2 He

Damp. -

0.6

crit

Film speed

1 cm/sac

MAX. ACCELERATION

<0.05g

<0.05g

<0.05g

Figura 2. Continued.

00


Station No.637

34.249°N,

118.475°W

Sepulveda VA Hospital

Ground

SMA

| 751

(VA)

EARTHQUAKE OF

3 December 1980

1138 G.m.t.

Epicentral distance

34 km

DIRECTION

L 360°

V

Up

T 270°

CONSTANTS

Sens .

Preq.

Damp.

Sens .

Freq .

Damp.

1.84 cm/g

26.3 He

0 .55

ccit

1.81 cm/g

25.6 He

0.55 ccit

Sens. «

1.00 cm/g

Freq. «

25.0 He

Damp. «

0.55 crit

Film speed -

1 cm/sec

MAX. ACCELERATION

0.07g

<0.05g

<0 .05g

Figure 2.

Continued.

to


Station No.655

34.312°N,

118.496°W

Jensen Filter Plant

Administration Bldg., basement

SNA

I 259

(MWD)

EARTHQUAKE OP

3 December 1988

1138 a.m.t.


38 km

DIRECTION

L 022°

V

Up

T 292°

CONSTANTS

Sens .

Preq .

Damp .

Sens .

Preq .

Damp .

Sens .

Preq .

Damp.

1.78 cm/g

26.3 Hz

0.57 crit

1.74 cm/g

27.0 Hz

0 .55 crit

1.63 cm/g

27.7 Hz

0.50 crit

MAX. ACCELERATION

<0 .

05g

<0.05g

<0.05g

Pilm speed »

1 cm/sec

Pigure

2. Continued.


Station No.655

34.313«N,

118.498«W

Janaan Filter Plant

Qanarator building, ground

RFT-350 8/n 1002 (MWD)

EARTHQUAKE OF

3 Dacanbar 1988

1138 Q.n.t.

Epicantral distance »

38 kn

DIRECTION

L 022°

V

Up

T 292«

CONSTANTS

Sans .

Fraq .

Danp .

1.85 cn/g

20.0 HE

0.60 crit

Sana. -

1.85 cn/g

Fraq. -

20.8 HE

Danp. -

0.55 crit

Sans. -

1.76 cn/g

Fraq. »

20.8 Hz

Danp. »

0.55 crit

Filn speed »

1 en/sac

MAX. ACCELERATION

<0.05g

<0.05g

<0.05g

Oi o

Figura

2. Continuad


Station No.655

34.309°N,

118.499'W

Jensen Filter Plant

Res*rvoir roof

RFT-350 s/n 1003 (MWD)

EARTHQUAKE OP

3 December 1988

1136 Q.n.t.

Epicentral distance

DIRECTION

L 022°

V

Up

T 292

CONSTANTS

38 km

Sens. « 1.75 cm/g

Preq. a 20.4 HE

Damp. a 0.57 crit

Sens. a 1.72 cm/g

Preq. »

21.7 HE

Damp.

» 0.57 crit

Sens. «

1.74 cm/g

Preq. »

20.4 HB

Damp. »

0.57 crit

Pilm speed =

1 cm/sec

MAX. ACCELERATION

<0.05g

<0 .05g

<0.05g

Figure

2. Continued

Ol to


Station No.5106

33.77B°N,

118.118«W

Long Baach vX Hospital

Basanant

SMA

I 845

(VA)

EARTHQUAKE OF

3 Dacaabar 1988

1138 Q.B.t.

Epicantral distance

DIRECTION

L 360°

V

Up

T 270*

CONSTANTS

40 kn

Sana. »

1.83 cn/g

Fraq. *

25.6 Hz

Oanp. «

0.55 celt

Sans. » 1.95 cn/g

Fraq. »

26.3 HE

Danp. «

0.57 celt

Sans. »

2.00 cn/g

Fraq. » 25.0 Hz

Danp. »

0.59 crlt

Filn spaed

1 en/sac

MAX. ACCELERATION

<0.05g

<0 .05g

<0.05g

Figura

2. Continued.


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station No.

5106

33.778°N,

118.118

Long Beach VA Hospital

6th floor

SNA

I 809

(VA)

EARTHQUAKE OP

3 DeceBber 1988

1138 Q.n.t.

Epicantral diatance »

40 km

L 360°

V

Up

T 270°

Sens .

Preq .

Damp.

Sens .

Freq .

Danp.

Sens .

Freq .

Danp.

1.78 cra/g

26.3 He

0.57 crit

1.95 cn/g

25.6 He

0.57 crit

1.85 cn/g

25.6 Hz

0.59 crit

<0 .05g

<0.05g

<0.05g

Piln ap«ed «

1 cn/aac

01 CO

Figure 2.

Continued.


Station No.5106

33.778«N,

118.118°W

Long Beach VA Hospital

llth floor

SMA

I 749

(VA)

EARTHQUAKE OF

3 Deceaber 1988

1138 Q.m.t.


40 km

DIRECTION

L 360°

V

Up

T 270°

CONSTANTS

Sans. m

1.88 cn/g

Freq. »

25.6 HE

Damp. «

0.50 crit

Sens.

« 1.81 cn/g

Freq. »

26.3 HE

Danp. »

0.53 crit

Sens. »

1.77 cn/g

Praq. »

27.0 HE

Danp. »

0.50 crit

Piln speed »

1 en/sec

MAX. ACCELERATION

<0 .05g

<0 .

05g

<0 .05g

Ol

Figura 2.

Continuad.


Station No.2?7

34.157°N,

117.676°W

San Antonio bam

Crest

SNA

I 476

(ACOE)

EARTHQUAKE OP

3 Decomber 1988

1138 Q.m.t.

Epicontral distance

« 42

km

DIRECTION

L 090°

V

Up

T 360°

CONSTANTS

Sons. «

1.80 cra/g

Freq.

« 25.6 HE

Damp. *

0.6

c rit

Sens. «

1.80 cra/g

Freq. a

25.5 HE

Damp. «

0.6

c rit

Sons.

« 1.85 cm/g

Freq. «

25.3 HE

Damp. «

0.6

c cit

Film spaed

« 1

cm/sec

MAX. ACCELERATION

0,0

6g

0.0

5?

O.l

Og

en

en

Figuro 2.

Continued.


Station No.281

34.158«N,

117.682°W

San Antonio Dam

Right abutment

SNA

I 477

(ACOE)

EARTHQUAKE OP

3 December 1988

1138 G.m.t.

Epicentral distance

DIRECTION

L 090°

V

Up

T 360°

CONSTANTS

42 km

Sens. »

1.87 cm/g

Freq. a 25.6 Hz

Damp. «

0.6

crit

Sana. «

1.75 cm/g

Freq. m 26.1 He

Damp. «

0.6

crit

S«nfi. «

1.85 cm/g

Fr«q. »

25.7 He

Damp. «

0.6

crit

Pila speed «

1 cm/aec

MAX. ACCELERATION

<0

. 0

5g

<0.0

5g

<0 .

05

g

en Oi



DIRECTION

L 090°

CONSTANTS

MAX. ACCELERATION

Sens. a

1.90 cm/g

Freq. »

25.4 HE

Damp

0.6

crit

Station No.

287

34.156°N,

117.675°W

San Antonio Dam

Downstream

SNA

I 475

(ACOE)

V

Up

Sens, a

1.80 cm/g

Preq. a

26.0 He

EARTHQUAKE OF

Damp, a

0.6

crit

3 December 1988

T 360°

Sens, a

1.77 cm/g

1138 Q.m.t.

Preq. a

25.5 He

Damp. a

0.6

crit

Epicentral distance a

42 km

Film speed a

1 cm/sec

01

<0 .

05g

<0 .05g

<0 .05g

Figure 2.

Continued.

strong-motion data from the pasadena, … · geological survey open-file report 89-203...

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