GEOLOGICAL SURVEY OPEN-FILE REPORT 90-311 · motion stations in the southern California region that triggered during the ML=5.5 Upland earthquake of February 28, 1990. Additional

GEOLOGICAL SURVEY OPEN-FILE REPORT 90-311

STRONG-MOTION RECORDINGS FROM THE ML = 5.5

UPLAND, CALIFORNIA EARTHQUAKE OF FEBRUARY 28, 1990

By

123 2 E. C. Etheredge, A. V. Acosta, L. J. Foot*, D. A. Johnson,

11 1 R. P. Maley, R. L. Porcella, and J. C. Switzer

1 Manlo Park. Calif.

2 Lawndala, Calif.

3 Las Va§aa, N«v.

Tail rapart it pr liatinary aad aa« not »««a r«Ti«w«4 far nf«ra\ity witk

V.f. O««l«fi«al fvrvay 4it«rlal atamdar4a. Any mi« af tra4«, pr«4m«t, «r

flrai ** if far daaariptira pmrpoaaa aaly ami* daaf aat Imply mdaraaaaat

ay tka U.i. Oararaaiaat.

April 1990

Department of the InteriorU. 8. GEOLOGICAL SURVEY

STRONG-MOTION RECORDINGS FROM THE

ML 5.5 UPLAND, CALIFORNIA EARTHQUAKE!

OF FEBRUARY 28. 1990

The chief purpose of the work is for the benefit of engi neers and architects. It has been felt that they should say what they want, and the general consensus obtained from them is that recording should start at the point where slight damage begins and that such records should have sufficient amplitude for interpretation. The upper limit should be the recording of acceleration for as wide a range as the design of the instrument permits, and the upper limit should exceed 0.2 the acceleration of gravity.

N. H. HECK. COAST & GEODETIC SURVEY, 1931

OPEN-FILE REPORT 90-311

CONTENTS

Page

INTRODUCTION- ------------------------- 1ACCELEROGRAPH DATA- ---------------------- 2

ILLUSTRATIONS

Figure 1. U.S. Geological Survey Cooperative Strong-MotionInstrumentation Network accelerograph stations that triggered during the Upland earthquake of February 28, 1990 - - - .................... 4

2. Accelerograms from the USGS Cooperative S-M Instrumentation Network:

San Antonio Dam- -----------------14Live Oak Reservoir ----------------17Weymouth Filter Plant- --------------20Morris Dam -------------------- 22Lytle Creek- -------------------23Sycamore Forest Station- -------------24Orange County Reservoir- -------------25Diemer Filter Plant- ---------------27Carbon Canyon Dam- ----------------28Prado Dam- --------------------30Devore Water Dept. ----------------33Paradise Springs Camp- --------------34Santa Ana River Bridge --------------35Rial to Fire Station- ---------------38Whittier Narrows Dam ---------------39Brea Dam ---------------------41Whittier, Bright Ave.- --------------44Valyermo Forest Station- -------------46San Bernardino Valley College- ----------47Col ton Interchange ----------------48San Bernardino, 'F 1 Street ------------50San Bernardino, Government Center- --------51Lake Mathews -------------------55Garvey Reservoir -----------------56Pasadena, Wilson Avenue- -------------58Norwalk, 12400 Imperial Hiway- ----------59Norwalk, 12440 Imperial Hiway- ----------64Loma Linda Medical Center- ------------71Alhambra, Fremont Avenue -------------72Loma Linda VA Hospital --------------74Alhambra, Norwich Avenue -------------73

ILLUSTRATIONS

Page

Figure 2. Mills Filter Plant --------------- 79(con't) Los Angeles, Bulk Mail Facility --------- 80

Santa Ana, Orange County Engineering Bldg.- - - - 81Reche Canyon- ------------------ 82Littlerock Post Office- ------------- 83Orange County, Wayne Airport- ---------- 84Los Angeles, Griffith Park Observatory- ----- 85Long Beach, VA Hospital ------------- 86San Joaquin Reservoir -------------- 90Newport Beach, Newport Center Drive ------- 92Palos Verdes Reservoir ------------- 94Sepulveda VA Hospital -------------- 96Jensen Filter Plant --------------- 97Leona Valley Fire Station ------------ 100

TABLE

Table 1. Strong-motion stations triggered during the Upland earthquake of February 28, 1990 ----------

INTRODUCTION

The U.S. Geological Survey's Cooperative Strong-Motion Instrumentation

Network consists of approximately 1000 stations located in 41 states and

Puerto Rico. Station instrumentation is owned by numerous Federal, State, and

local agencies and various private industries and property owners. Key

objectives of the Network program are to record both strong ground motion and

the response of various types of engineered structures during potentially

damaging earthquakes and to disseminate resultant data to the international

earthquake engineering research and design community. This report presents

peak acceleration data and copies of accelerograms recorded at 46 strong-

motion stations in the southern California region that triggered during the

ML=5.5 Upland earthquake of February 28, 1990. Additional strong-motion

recordings were made at stations operated by the University of Southern

California and the California Division of Mines and Geology's Office of

Strong-Motion Studies. Record information and data from those networks can be

obtained by contacting the agencies' headquarters in Los Angeles and

Sacramento, respectively.

The ML=5.5 Upland, California earthquake occurred at 23:43:36.0 (G.m.t.)

on February 28, 1990. The epicenter was located at 34.140° N. lat. and

117.688° W. long., approximately 5 km northwest of downtown Upland and 40 km

east of Pasadena; depth was about 10 km. The earthquake was reported felt

from Santa Barbara, California to Ensenada, Mexico and east to Las Vegas,

Nevada (U.S. Geological Survey, Preliminary Determination of Epicenters, March

22, 1990).

ACCELEROGRAPH DATA

The main shock triggered 82 accelerographs at 46 Cooperative Network

stations at epicentral distances in the range 3-76 km (fig. 1 and table 1).

Twelve of these stations are owned by the Metropolitan Water District of

Southern California (MWD), six by the U.S. Army Corps of Engineers, three by

the Veterans Administration, two shared by the U.S. Geological Survey and the

Bechtel Corporation, one by the California Dept. of Transportation, and the

remainder by the U.S. Geological Survey (see table 1). The analog records

shown in figure 2 were recorded on triaxial accelerographs located at 16

ground sites, twelve dam/reservoir facilities, four filter plants, twelve

large buildings, and two bridges. Other recordings were made on multi-channel

(9-24) systems at one dam, one base-isolated bridge, and five buildings (see

table 1). Ground accelerations from the ML=5.5 main shock generally reached

peak levels of 10 percent £ out to distances of approximately 30 km. However,

high amplitude ground motions were recorded at three close-in stations: San

Antonio Dam (3 km), Live Oak Reservoir (5 km), and Weymouth Filter Plant (8

km; see figure 2 and table 1).

The closest station is San Antonio Dam, a flood and debris control

reservoir operated by the U.S. Army Corps of Engineers to provide protection

against flooding in the alluvial plain of the upper Santa Ana Valley. The

reservoir, located about 7 km northeast of Claremont, was empty at the time of

the earthquake. The crest of the earthfill embankment is approximately 1175 m

long, 10 m wide, and 50 m above the original streambed. Both of the abutments

rest directly on bedrock. Records were obtained from the crest station

situated midway between the two abutments, at a station located midchannel,

approximately 150 m downstream from the toe, and on the right abutment. The

crest recording contains 4-5 seconds of .2 £-.6 £, 2-Hz horizontal motion.

The right abutment and downstream recordings are similar except for the

somewhat higher frequencies at the abutment site, which also recorded higher

vertical motions than either the crest or downstream stations. Peak

accelerations greater than .1 g were recorded for 3-4 seconds at both the

abutment and downstream sites.

The second closest recording station is located at Live Oak Reservoir, a

water storage facility operated by the MWD. The reservoir, situated near the

mouth of Live Oak Canyon, was empty at the time of the earthquake. The

reservoir instrumentation consists of a triaxial accelerograph on the abutment

and a 12-channel remote recording system on the earthfill embankment with 3

sensors at center crest, 2 at left crest, 1 at left slope, 3 at center slope,

and 3 at center toe. Peak horizontal accelerations varied widely, from .18 £

at center toe to .53 g at left crest (see figure 2).

Two accelerographs recorded the main shock at Weymouth Filter Plant, a

water treatment facility operated by the MWD, just north of the city of

LaVerne. The horizontal ground level accelerations were recorded in the range

.2-.3 £ at frequencies of 5-10 Hz. The second accelerograph, located on the

roof of a large water storage tank produced peak horizontal motions of about

80 percent £, with very high-frequency (50-100 Hz) "spikes" in excess of 1

g. Vertical motions at the roof of the tank were of such high frequency

during strong shaking that maximum trace amplitudes on the film recording

could not be discerned; the maximum observable peak was measured at .87 £.

46

Figure 1.

U.S. Ge

olog

ical Su

rvey

Cooperative

Strong-Motion

Instrumentation

Network

acce

lero

grap

h stations (s

olid

ci

rcle

s) th

at triggered

duri

ng the

ML-5

.5

Upland earthq

uake

(star) of

Fe

brua

ry 28,

1990

.

Table 1. Strong-motion stations triggered during the Upland earthquake of February 28, 1990 - Main shock

Station IdentificationMap USGS Name Index Number [Owner] Number

1 287 San Antonio Dam[ACOE]

Crest

Right Abutment

Downstream

2 656 Live Oak Reservoir[MWD]

Abutment

Structure Array:Ch. 1- Center CrestCh. 2- Center CrestCh. 3- Center CrestCh. 4- Left CrestCh. 5- Left CrestCh. 6- Left SlopeCh. 7- Center SlopeCh. 8- Center SlopeCh. 9- Center SlopeCh. 10- Center ToeCh. 11- Center ToeCh. 12- Center Toe

3 5164 Weymouth Filter Plant[MWD]

Bldg. , Ground Level

Water Tank, Top

Epicentral AccelerationCoordinates Distance 1 Component (Lat. °N, (km) Direction Long. °W) (degrees)

34.157 3117.676

090Up360

090Up360

090Up360

34.137 5117.753

180Up090

155UP245155245245155UP245155UP245

34.114 8117.778

015UP285

015UP285

Maximum(a)

.46

.40

.58

.40

.83

.48

.47

.43

.43

.34

.24

.28

.25

.28

.44

.29

.53

.36

.22

.13

.32

.18

.18

.19

.31

.26

.23

.83

.871.05

Note: Peak motions on water tank are approximate; record contains extremely high-frequency accelerations that are difficult to discern.

Table 1. Strong-motion stations triggered during the Upland earthquake of February 28, 1990 (continued)


4 756 Morris Dam[MWD]

Left abutment

5 5035 Lytle CreekMann Residence[USGS]

6 5036 SycamoreForest Station[USGS]

7 697 Orange County Reservoir[MWD]

Abutment

Crest

8 698 Diemer Filter Plant[MWD]

Admin. Bldg. Basement

Reservoir Roof

9 108 Carbon Canyon Dam[ACOE]

Crest

Left Abutment

Epicentral AccelerationCoordinates (Lat. °N, Long. °W)

34.173117.879

34.26117.50

34.193117.426

33.936117.884

33.913117.819

33.914117.839

Distance Component (km) Direction

(degrees)

17

245Up155

23 315Up225

26 315Up225

26

090Up360

090Up360

27

280Up190

280Up190

28

130Up040

130Up040

Maximum (1)

.05*.08

.12

.07

.11

.06**

.09

.05

.10

.17

.08

.11

Didnot

trigger

.10*.06

.11

.08

.14

.06

.05

.05

Right Abutment instrument malfunctioned


Map USGS Index Number Number

10 969

11 5265

12 5032

13 5235

Station IdentificationName [Owner]

Prado Dam[ACOE)

Crest

Left Abutment

Downstream

San Bernardino Array Devore Water Dept. [USGS]

Paradise Springs Camp [USGS]

RiversideSanta Ana River Bridge

EpicentralCoordinates Distance (Lat. °N, (km) Long. °W)

33.890 28117.641

34.235 29 117.407

34.40 30 117.80

33.968 30117.447

AccelerationComponent Direction (degrees)

090Up 360

090Up 360

090Up 360

360 Up 270

120 Up 030

Maximumla)

.08

.06

.07

** .05

.20

.11

.11

.06

.04

.07

* *.07

14 5268

[MWD/USGS]

North Abutment Recorder Building

Structure Array:Ch. 1- North AbutmentCh. 2- North AbutmentCh. 3- North AbutmentCh. 4- Mid SpanCh. 5- Mid SpanCh. 6- Mid SpanCh. 7- Below BearingCh. 8- Below BearingCh. 9- Below BearingCh. 10- Above BearingCh. 11- Above BearingCh. 12- Above Bearing

San Bernardino Array Rialto Fire Station [USGS]

34.134117.368

31

165Up075

345Down075345Down075345Down075345Down075

360Up270

,080506

,07 ,05 .06.09**.07*.08

.07

.05

.06



15 289

16 951

17 804

18 5031

19 5269


Whittier Narrows Dam [ACOE]

Crest

Upstream

Brea Dam [ACOE]

Crest

Left Abutment

Downstream

Whittier 7215 Bright Ave. [USGS]

Basement

5th Floor

10th Floor

Valyermo Forest Sta. Ground Level [USGS]

San Bernard ino Array Valley College [USGS]

Epicentral AccelerationCoordinates (Lat. °N, Long. °W)

34.020 118.053

33.890 117.925

33.977 118.036

34.44 117.85

34.086 117.309

Distance Component Maximum (km) Direction (g)

(degrees)

35

120 Up 030

35

130 Up 040

130 Up 040

130 Up 040

36

failed

36 300 Up 210

37 360 Up 270

.05

.05 *

*

.08 *.09

.06

.06 *.06

*

*

.07

.06

.05

.05

.05


Station IdentificationMap USGS Index Number Number

Name [Owner]

Coordinates (Lat. °N, Long. °W)

Epicentral Distance

(km)

Acceleration Component Maximum Direction (£) (degrees)

20 754

21 5267

22 5245

23 707

24 709

25 Temp

Colton Interchange 34.064 1-10/215 117.297 [CDOT]

Ground Site

Bridge Cell

San Bernardino Array 34.183 5931 F Street 117.295 [USGS]

San Bernardino 34.106 County Government Center 117.287 (USGS]

Basement, SW

Ground Site

38

080Up350

080Up350

.07 *.07

.25

.06

.07

38

38

Structure Array:Ch. 1- 2nd FloorCh. 2- 2nd FloorCh. 3- 2nd FloorCh. 4- 2nd FloorCh. 5- 4th FloorCh. 6- 4th FloorCh. 7- 6th FloorCh. 8- 6th FloorCh. 9- 6th FloorCh. 10- 6th FloorCh. 11- 4th FloorCh. 12- 4th Floor

Lake Mathews Dike Toe [MWD]

Garvey Reservoir [MWD]

Abutment Bldg.

Crest

Pasadena (CIT) 525 S. Wilson Ave. [USGS]

Level, NW Level, NE Level, NE Level, SW Level, SW Level, NW Level, (Roof) NE Level, (Roof) NW Level, (Roof) SWLevel, (Roof) NELevel, NELevel, NE

33.852117.451

34.050118.114

39

39

360090360090090360090360090360090360

252Up162

,05 ,05 ,07 ,09 ,09 ,08 ,07 ,07 ,05

,05 *,06

34.137118.127

40 360Up270

,05**




Epicentral Distance 1

(km)

Acceleration Component Maximum Direction (£) (degrees)

26 634 Norwalk 33.916 12400 Imperial Highway 118.067 [USGS/BECHTEL]

North Ground Site

South Ground Site

Basement

4th Floor

8th Floor

27 5239 Norwalk 33.917 12440 Imperial Highway 118.066 [USGS/BECHTEL]

North Ground Site

South Ground Site

Basement

Structure Array 1: Ch. 1- 9th Level (Roof) Center Ch. 2-12

Structure Array 2: Ch. 13- 9th Level (Roof), East end Ch. 14-16Ch. 17- 9th Level (Roof), Center Ch. 18-20Ch. 21- 9th Level (Roof), West end Ch. 22-24

28 129 Loma Linda Medical Center 34.050 Basement 117.263 [USGS]

29 482 Alhambra 34.085 900 S. Fremont Ave. 118.149 [USGS]

Structure Array Ch. 1-6Ch. 7, 2nd Floor, Center Ch. 8-12

42

42

42

42

090UP360

*

*

*

*

.06*,06

090

180

180

180

.05 *

.06*,06*,06*

090 ,06 *

10


Map Index Number

30

31

32

33

34

35

36

37

USGS Number

5229

5279

5275

5129

281

5037

5030

5287

Station IdentificationName Coordinates [Owner] (Lat. °N,

Long. °W)

Loma Linda 34.050VA Hospital 117.249[VA/USGS]

Building 1 Structure Array:Ch. 1- Ground Floor, CenterCh. 2- Ground Floor, CenterCh. 3- Ground Floor, CenterCh. 4- 4th Floor, CenterCh. 5- Ground Floor, NorthCh. 6- 4th Floor, CenterCh. 7- 4th Floor, NorthCh. 8- Ground Floor, SouthCh. 9- 4th Floor, South

North Ground Site

South Ground Site

Alhambra 34.0843213 Norwich Ave. 118.159[USGS]

Mills Filter Plant 33.920[MWD] 117.320

Los Angeles 33.996Bulk Mail Facility 118.162[USGS]

Santa Ana, Orange Cty. 33.751Engineering Bldg. , 117.870Basement [USGS]

Reche Canyon 34.004Olive Dell Ranch 117.223[USGS]

Littlerock Post Office 34.521[USGS] 117.991

Orange County 33.677Wayne Airport 117.869

Epicentral AccelerationDistance Component

(km) Direction (degrees)

43

Down180270270270180270180270

360Up270

360UP270

43

43

45 360UP270

46

47

50 300UP210

54

Maximum(a)

**

.06

.15

.07

.11

.12*.11

.05**

.06*.06

*

*

**.06

*

*

.09*.10

*

[USGS]

11



38 141

39 5106

40 5286

41 5257


Los Angeles, Griffith Park Observatory [USGS]

Long Beach VA Hospital [VA]

Ground Site

Basement

6th Floor

llth Floor

Costa Mesa Placentia Fire Station [USGS]

San Joaquin Reservoir [MWD]


34.118 118.299

33.778 118.118

33.658 117.931

33.620 117.842

Epicentral AccelerationDistance Component Maximum

(km) Direction (£) (degrees)

55 *

56

*

*

*

360 * Up * 270 .07

58 Did not

trigger

59

42 5246

Abutment

Crest

Newport Beach840 Newport Center Dr.[USGS]

33.618117.878

60

StructureCh.Ch.Ch.Ch.Ch.Ch.Ch.Ch.Ch.Ch.Ch.Ch.

1-2-3-4-5-6-7-8-9-10-11-12-

ArrayTowerTowerTowerTowerCenterCenterTowerTowerTowerTowerTowerTower

\2222

222

, Level, Level, Level, LevelBuildingBuilding, Level, Level, Level1, Level1, Level1, Level

1 (Garage), Center 1 (Garage), Center1 (Garage), Center2 (Plaza), West End

Level 2 (Plaza), Center Level 2 (Plaza), Center

9 (Roof), South End10 (Penthouse), Center 10 (Penthouse), Center9 (Roof), East End10 (Penthouse), Center 10 (Penthouse), Center

360Up090360360090090360090360270360

.05

Failed .07 .07 *

Failed Failed

.05 *

12



43 710

44 637


Palos Verdes Reservoir [MWD]

Crest

Abutment

Sepulveda VA Hospital [VA]


33.772 118.319

34.249 118.478

Epicentral Distance 1

(km)

70

72

AccelerationComponent Direction (degrees)

Maximum (1)

*

*

Ground

45 655 Jensen Filter Plant 34.312 [MWD] 118.496

Administration Bldg. Basement

Generator Room

Reservoir Roof

46 5029 Leona Valley Fire Sta. 34.62 [USGS] 118.29

75

76

In,-Distance is from station to epicenter at 34.140° N. lat. and 117.702° W. long.

*Indicates peak recorded acceleration is less than 0.05 g.

13

U.S.

STRONG-MOTION

NETWORK

DIRECTION

CONSTANTS

MAX. AC

CELE

RATI

ON

Station

No.

287

34.157 N,

11

7.67

6 W

San Antonio

Dam

Cres

tSMA

# 47

6 (A

COE)

Eart

hqua

ke of

28 Fe

brua

ry 19

90

2343

G.m.t.

Epic

entr

al di

stan

ce =

3 km

L 090

V Up

T 36

0

Sens

. =

1.80 cm/g

Freq

. =

25.6 Hz

Damp

. =

0.6

crit

Sens.

= 1.

80 cm

/gFr

eq.

= 25

.5 Hz

Damp

. =

0.6

crit

Sens

. =

1.85 cm/g

Freq

. =

25.3 Hz

Damp

. -

0.6

crit

Film

sp

eed

= 1 cm

/sec

0.46 g

0.40 g

0.58 g

y\fVVv

/^^VWi

^JV^

J^Av/\/V"V\^V^

Figu

re 2. Ac

cele

rogr

ams

from

USG

S Cooperative

Stro

ng-M

otio

n Instrumentation

Netw

ork

stat

ions

recorded du

ring

the

Upla

nd,

California earthquake of

February 28

, 1990.

See

Cont

ents

(p

ages

ii an

d iii) fo

r sp

ecif

ic st

atio

ns.

U.S. STRONG-MOTION NETWORK

DIRECTION

CONSTANTS

MAX.

ACCELERATION

Station No

. 287

34.158 N,

117.

682

WSa

n Antonio Dam

Right

abutment

SMA #

477

(ACOE)

Earthquake of

28

February 1990

2343 G.

m.t.

Epicentral distance =

3 km

L 09

0

V

UP

T 360

Sens.

Freq.

Damp

.

Sens.

Freq.

Damp

.

Sens.

Freq.

Damp

.

1.87

cm/g

25.6

Hz

0.6

crit

1.75 cm/g

26.1

Hz

0.6

crit

1.85

cm

/g

25.7

Hz

0.6

crit

0.40

g

0.83 g

0.48

g

Film sp

eed

= 1 cm/sec

V*A/V


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station No

. 287

34.156 N,

11

7.67

5 W

San

Antonio Dam

Downstream

SMA #

475

(ACO

E)

Earthquake of

28 February 19

90

2343

G.

m.t.


3 km

L 090

V

Up

T 360

Sens.

= 1.90 cm

/g

Freq

. -

25.4

Hz

Damp

. -

0.6

crit

Sens.

= 1.80

cm/g

Freq.

= 26

.0 Hz

Damp

. =

0.6

crit

Sens.

- 1.

77 cm

/gFreq.

= 25

.5 Hz

Damp.

= 0.6

crit

Film speed

= 1 cm/sec

0.47

g

0.43

g

0.43

g

U.S.

STRONG-MOTION NETWORK

DIRECTION

CONSTANTS

MAX.

ACCELERATION

Station

No.

656

34.1

40°

Nort

h,

117.

749°

We

stLIVE OAK RESERVOIR

Abutment

SMA-

1 #

258

(MWD)

Earthquake of

28 February 1990

2343 G.m.t.

Epicentral di

stan

ce =

5 km

L 180'

V Up

T 90

'

Sen.

Freq.

Damp.

Sen.

Freq

Damp

1.80 cm/g

25.8 Hz

0.6

crit

1.95

cm/g

26.1 Hz

0.6

crit

Sen.

-1.90 cm/g

Freq

=

26.2 Hz

Damp

*

0.6

crit

Film speed

- 1 cm

/sec

0.34

g

0.24

g

0.28

g


CH.

DIRECTION

LOCATION

SENSITIVITY

MAX.

ACCELERATION

00

Station

No.

656

34.1

37 N,

11

7.75

3 W

Live

Oak

Rese

rvoi

r

Stru

ctur

e ar

ray

CRA

# 22

5

(MWD)

Eart

hqua

ke of

28 Fe

brua

ry 1990

2343 G.

m.t.

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

155

Up 245

155

245

245

155

Up 245

155

Up 245

Cent

er cr

est

Cent

er cr

est

Cent

er cr

est

Left

cr

est

Left crest

Left

slope

Cent

er slope

Cent

er sl

ope

Cent

er sl

ope

Cent

er toe

Cent

er toe

Cent

er toe

1.83

1.84

1.87

1.85

1.81

1.87

1.85

1.87

1.85

1.83

1.85

1.85

0.25 g

0.28 g

0.44

g

0.29 g

0.53 g

0.36

g

0.22 g

0.13 g

0.32 g

0.18

g

0.18 g

0.19

g

Epicentral di

stan

ce =

5 km

Film speed

= 1 cm/sec

[See accelerogram on ne

xt pa

ge]

Live Oak

Reservoir

CR

A-1

#2

25

(MW

D)

1

,*

co

7

wrtvy

J^^

^W

S/v

A.

vy

^^

***V

»v

10 >

~*«fi

r^ri

^^

11 "

N*W

4&^^

**

12

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Station No

. 51

64

34.1

14 N,

117.

778

W

Weymouth Filter Pl

ant

Ground le

vel

SMA #

1053

(MWD)

Earthquake of

28

February 19

90

2343

G.

m.t.

Epicentral di

stan

ce -

8 km

L 017

V Up

T 28

7

Sens. =2.00 cm/g

Freq.

= 24

.9 Hz

Damp.

= 0.6

crit

Sens. =1.83 cm/g

Freq

. =

25.9 Hz

Damp.

- 0.

6 cr

it

Sens.

= 1.88

cm

/g

Freq.

= 26

.3 Hz

Damp

. =

0.6

crit

Film speed

= 1 cm/sec

0.31

g

0.26 g

0.23 g

to o

*W^^

^w*» <~

>»*-

*

*MiV

|^^


DIRECTION

CONSTANTS

MAX. AC

CELE

RATI

ON

Stat

ion

No.

5164

34.115 N,

117.779

W

Weymouth Fi

lter

Pl

ant

Tank

to

p SM

A #

1052

(MWD)

Eart

hqua

ke of

28 Fe

brua

ry 1990

2343 G.

m.t.

Epic

entr

al di

stan

ce =

8 km

L 017

V Up

T 287

Sens

. =

1.86 cm/g

Freq

. =

25.5

Hz

Damp

. =

0.6

crit

Sens

. -

1.85

cm

/gFr

eq.

= 25

.9 Hz

Damp

. =

0.6

crit

Sens

. =

1.77

cm/g

Freq

. =

25.8 Hz

Damp

. =0.6

crit

Film sp

eed

= 1 cm/sec

0.83 g

0.87 g

1.05 g

to

»WitM

ttnin

ttf n'

- ft?

J / rt

i*ttr

i'r.it

. min:

;juR

j^i'i

TT^"

^TS^

Tf*

r^ ?

rT""

r

- »"

- n .'

.«.«

i

.iim

*

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Station No

. 75

634.173 N,

117.879

WMorris Dam

Left

abutment

SMA

# 1051

(MWD

)

Earthquake of

28

February 1990

2343 G.

m.t.


17 km

L 24

6

V Up

T 156

Sens. =1.90 cm/g

Freq.

= 25

.4 Hz

Damp

. =

0.6

crit

Sens.

= 1.91 cm/g

Freq

. =

25.9

Hz

Damp.

= 0.

6 cr

it

Sens. =1.90 cm/g

Freq.

= 27

.1 Hz

Damp.

«= 0.

6 cr

it

Film speed

= 1 cm/sec

0.05

g

0.04 g

0.08

g

to

U.S. STRONG-MOTION

NETWORK

DIRECTION

CONS

TANT

S MAX. AC

CELE

RATI

ON

CO W

Stat

ion

No.

5035

L 315

Sens

. =1.90 cm

/g

0.12

g

34.2

6 N,

117.50 W

Freq

. =

25.3 Hz

Lytl

e Cr

eek

Damp

. =0.6

crit

Mann

residence

Grou

nd

V Up

Se

ns.

= 1.

93 cm/g

0.07 g

SMA-

1 #

1488

(USG

S)

Freq

. =

25.0

Hz

Damp

. =

0.6

crit

Eart

hqua

ke of

28 Fe

brua

ry 1990

T 225

Sens

. =1.78 cm/g

0.11

g

2343

G.

m.t.

Fr

eq.

= 26.1 Hz

(W

WVB

trig

ger

time)

Damp

. =0.6

crit

Epic

entr

al di

stan

ce =

23 km

Film speed

= 1 cm

/sec

*v*w

*~"^

VW\A

/>ty

Y^^

U.S.


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station

No.

5036

34.193 N,

117.426 W

Sycamore Forest Station

Ground

SMA-

1 #

1505

(USGS)

Earthquake of

28

February 1990

2343 G.m.t.

(WWV

B trigger time)


26 km

L 31

5

V

Up

T 22

5

Sens.

« 1.79 cm/g

Freq.

= 25.8 Hz

Damp

. =

0.6

crit

Sens.

= 1.86

cm/g

Freq.

= 25

.8 Hz

Damp.

« 0.6

crit

Sens.

= 1.

79 cm

/gFr

eq.

= 26.2 Hz

Damp

. =

0.6

crit

Film sp

eed

« 1 cm/sec

0.06

g

CO


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Station No.

697

33.935 N,

117.883

W

Orange Co

unty

Reservoir

Piezometer Building

SMA

# 10

46

(MWD

)

Earthquake of

28 February 1990

2343

G.

m.t.


26 km

L 090

V

Up

T 36

0

Sens.

= 1.89 cm

/gFreq.

= 25

.5 Hz

Damp.

= 0.6

crit

Sens.

= 1.

91 cm

/gFr

eq.

- 24.9 Hz

Damp.

= 0.6

crit

Sens.

= 1.92

cm

/gFreq.

» 25

.2 Hz

Damp.

= 0.

6 cr

it

Film speed =

1 cm/sec

0.09 g

0.05 g

0.10 g

to CJJ


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station No.

697

33.936 N,

117.884 W

Oran

ge Co

unty

Reservoir

Cres

tSMA #

6696

(MWD)

Earthquake of

28 February 1990

2343

G.

m.t.


26 km

L 090

V Up

Sens

.Fr

eq.

Damp

.

Sens

.Fr

eq.

Damp

.

= 1.86 cm/g

= 26.4 Hz

= 0.

62 crit

=1.96 cm

/g=

24.9 Hz

= 0.61 crit

0.17g

0.08g

T 360

Sens.

= 1.

94 cm/g

Freq.

= 25

.8 Hz

Damp

. =0.64 cr

it

Film speed

= 1 cm/sec

O.llg

CO

0)

U.S.

STRONG-MOTION

NETWORK

DIRECTION

CONS

TANT

SMAX. AC

CELE

RATI

ON

Station

No.

698

33.9

11 N,

117.817 W

Diemer Fi

lter

Pl

ant

Reservoir

roof

SM

A #

1045

(MWD)

Earthquake of

28

Fe

brua

ry 1990

2343

G.

m.t.

Epic

entr

al distance =

27 km

L 28

0'

V Up

T 19

0'

Sens

. =

1.85 cm

/gFr

eq.

= 26

.1 Hz

Damp

. =

0.6

crit

Sens

. =

1.80

cm

/gFr

eq.

= 25.4 Hz

Damp

. =0.6

crit

Sens

. =

1.78 cm/g

Freq

. =

25.2 Hz

Damp

. =

0.6

crit

Film

sp

eed

= 1 cm/sec

0.10

g

0.04 g

0.06 g

U.S. ST

RONG

-MOT

ION

NETWORK

DIRECTION

CONS

TANT

SMAX. AC

CELE

RATI

ON

Station

No.

108

33.914°

North,

117.839° West

CARBON CA

NYON

DA

MCrest

SMA-

1 #

383

(ASOE)

Earthquake of

28

Fe

brua

ry 1990

2343

G.m.t.

Epicentral di

stan

ce =

28 km

L 13

0'

V Up

T 040*

Sens

. =2.00 cm/g

Freq

. =

25.5

Hz

Damp

. =

0.6

crit

Sens

. =

2.00

cm/g

Freq

. -

25.9

Hz

Damp

. =0.6

crit

Sens

. =2.00 cm

/gFr

eq.

= 25.8 Hz

Damp

. =

0.6

crit

Film

speed

= 1 cm/sec

0.11 g

0.08 g

0.14 g

to CD

U.S.

ST

RONG

-MOT

ION

NETW

ORK

DIRE

CTIO

NCO

NSTA

NTS

MAX. AC

CELE

RATI

ON

Stat

ion

No.

108

33.9

13 N,

11

7.83

7 W

Carbon Ca

nyon

Dam

Left ab

utme

nt

SMA

# 38

2 (A

COE)

Earthquake of

28

February 1990

2343

G.m.t.

Epic

entr

al di

stan

ce =

28 km

L 13

0'

V Up

T 40

*

Sens

. =

1.95 cm/g

Freq

. -

26.0

Hz

Damp

. =

0.6

crit

Sens

. =

1.90

cm

/gFr

eq.

= 26

.2 Hz

Damp

. =

0.6

crit

Sens.

= 1.85 cm

/gFr

eq.

= 26.4 Hz

Damp

. =

0.6

crit

Film

sp

eed

= 1 cm/sec

0.06 g

0.05 g

0.05 g

CO

GO

O

U.S.

ST

RONG

-MOT

ION

NETW

ORK

Stat

ion

No.

969

33.8

90 N,

117.641 W

Prado

Dam

Crest

SMA

# 38

9 (A

COE)

Eart

hqua

ke of

28 February 1990

2343

G.

m.t.

Epic

entr

al distance =

28 km

DIRECTION

CONSTANTS

L 09

0 Sens.

=Fr

eq.

=Da

mp .

=

V Up

Sens.

=Fr

eq.

=Da

mp .

=

T 36

0 Sens.

-Freq.

=Damp .

=

Film

speed

-

2.00 cm

/g25.1 Hz

0.6

crit

1.80 cm/g

26.3 Hz

0.6

crit

1.80

cm/g

26.1

Hz

0.6

crit

1 cm/sec

MAX. ACCELERATION

0.08 g

0.06 g

0.07

g

U.S.

ST

RONG

-MOT

ION

NETWORK

Stat

ion No.969

33.8

90 N,

117.637

WPr

ado

Dam

Left

Ab

utme

ntSMA

# 38

8 (A

COE)

Eart

hqua

ke of

28

Fe

brua

ry 1990

2343 G.

m.t.

Epic

entr

al di

stan

ce =

28 km

DIRE

CTIO

N

L 090

V Up

T 36

0

CONS

TANT

S

Sens

. =

1.80

cm/g

Freq

. =

26.8 Hz

Damp

. -

0.6

crit

Sens

. =

1.80

cm/g

Freq

. =

24.9 Hz

Damp

. =

0.6

crit

Sens. =1.90 cm/g

Freq

. =

26.2 Hz

Damp

. =

0.6

crit

Film

speed

= 1 cm/sec

MAX. AC

CELE

RATI

ON

0.04

g

0.03 g

0.05 g

U.S.

ST

RONG

-MOT

ION

NETWORK

Station

No.

33.8

88 N,

Prad

o Dam

Down

stre

am

SMA

# 38

1

969

117.640

W

(ACO

E)

Eart

hqua

ke of

28

Fe

brua

ry 19

90

2343

G.

m.t.

Epic

entr

al di

stan

ce =

28 km

DIRE

CTIO

N

L 090

V Up

T 36

0

CONSTANTS

Sens

. =1.90 cm/g

Freq

. =

26.3 Hz

Damp

. =0.6

crit

Sens

. Fr

eq.

Damp

.

1.80

cm/g

26.2 Hz

0.6

crit

Sens.

= 1.85 cm

/gFr

eq.

- 25.8 Hz

Damp

. =0.6

crit

Film

sp

eed

= 1 cm

/sec

MAX. ACCELERATION

0.20 g

0.11 g

0.11 g

W to

^jiJ

jijf

^

^fS^V^^^


DIRECTION

CONS

TANT

S MAX. ACCELERATION

w w

Station

No.

5265

L

360

Sens

. =1.74 cm

/g

0.06

g

34.235 N,

117.407

W Fr

eq.

= 26

.6 Hz

San

Bern

ardi

no Ar

ray:

Da

mp.

= 0.

6 crit

Devo

re Water

Dept

.Gr

ound

V

Up

Sens

. =1.79 cm

/g

0.04 g

SMA-

1 #

3560

(U

SGS)

Fr

eq.

= 26

.4 Hz

Damp

. =

0.6

crit

Eart

hqua

ke of

28 Fe

brua

ry 19

90

T 270

Sens.

= 1.82 cm/g

0.07

g

2343

G.m.t.

Freq

. =

25.8 Hz

(W

WVB

trigger

time

) Da

mp. =0.6

crit

Epic

entr

al di

stan

ce =

29 km

Film

speed

= 1 cm

/sec

U.S.

STRONG-MOTION

NETWORK

DIRE

CTIO

NCO

NSTA

NTS

MAX.

AC

CELE

RATI

ON

Station

No.

5032

34

.40

N,

117.80

W Pa

radi

se Springs

Camp

Gr

ound

SMA-

1 #

1469

(USG

S)

Eart

hqua

ke of

28 February 1990

2343

G.

m.t.

(WWV

B trigger

time

)

Epic

entr

al di

stan

ce =

30 km

L 12

0

V Up

T 030

Sens.

= 1.79 cm

/gFr

eq.

= 26.1 Hz

Damp

. =

0.6

crit

Sens.

= 1.86 cm/g

Freq

. =

25.4 Hz

Damp

. =

0.6

crit

Sens. =1.83 cm/g

Freq

. =

25.2 Hz

Damp

. =

0.6

crit

Film sp

eed

= 1 cm/sec

0.07 g

W


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station

No.

5235

L

166

Sens

. =1.87 cm

/g

0.08

g

33.968 N,

11

7.44

7 W

Freq.

= 25.1 Hz

Rive

rsid

e,

Damp.

= 0.

62 cr

itSa

nta

Ana

River

Bridge

Abutment

V Up

Se

ns.

= 1.73 cm/g

0.05 g

SMA-

1 #

267

(USG

S/MW

D)

Freq.

= 26.5

Hz

Damp

. =0.59 cr

it

Earthquake of

28 Fe

brua

ry 1990

T 076

Sens

. =1.79 cm

/g

0.06 g

2343

G.m.t.

Freq.

= 25

.8 Hz

Damp

. =0.60 cr

it

Epicentral di

stan

ce =

30 km

Fi

lm speed

= 1 cm/sec

CJ


CH.

DIRECTION

LOCATION

SENSITIVITY

MAX.

ACCELERATION

Station No.

5235

33.968 N,

117.447

W

Riverside

Santa

Ana River

Bridge

Structure Array

CRA #

310

(MWD)

Earthquake of

28 February 1990

CO

2343

G.m.t.

0)

(WWVB

trigger ti

me)

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

346

Down

076

346

Down

076

346

Down

076

346

Down

076

North abutment

North abutment

North abutment

Mid-span

Mid-span

Mid-span

Below bearing

Below bearing

Below bearing

Above bearing

Above bearing

Above bearing

0.91cm/g

0.91

0.93

0.93

0.94

0.90

0.92

0.91

0.90

0.89

0.93

0.89

0.03 g

0.02

g

0.03

g

0.07

g

0.05

g

0.06

g

0.09 g

0.02

g

0.03

g

0.07

g

0.03

g

0.08 g


30 km

Film sp

eed

= 1 cm/sec

[See accelerogram on next page]

SANTA ANA RIVER BRIDGE

CRA-1 #310

(MWD

)

****

^

8 9

10 11 12


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Station No

. 5268

34.1

34 N,

117.368 W

San

Bernardino Ar

ray:

Rialto Fire St

atio

nGround

SMA-

1 #

1082

(USGS)

Earthquake of

28

February 1990

2343

G.

m.t.


31 km

L 36

0

V

Up

T 27

0

Sens.

= 1.

82 cm/g

Freq

. =

25.7

Hz

Damp.

= 0.

6 cr

it

Sens.

= 1.90

cm/g

Freq

. =

24.8 Hz

Damp

. =

0.6

crit

Sens.

= 1.

97 cm

/gFr

eq.

= 25

.0 Hz

Damp

. =

0.6

crit

Film sp

eed

= 1 cm

/sec

0.07

g

0.05

g

0.06

g

(A)

00

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

<*>

CO

Stat

ion

No.

289

34.020 N,

118.053 W

Whittier Narrows

Dam

Cres

tSMA

# 478

(ACOE)

Earthquake of

28

February 1990

2343 G.m.t.


35 km

L 118

V Up

T 02

8

Sens.

= 1.80 cm/g

Freq.

= 26.1 Hz

Damp

. -

0.61

cr

it

Sens.

= 1.

79 cm/g

Freq.

= 25.7

Hz

Damp.

- 0.57

cr

it

Sens.

Freq.

Damp.

1.79

cm/g

26.1

Hz

0.59

cr

it

0.05 g

0.05 g

0.04 g

Film sp

eed

= 1 cm

/sec

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Station No.

289

34.031 N,

118.054 W

Whittier Na

rrow

s Dam

Upstream

SMA #

376

(ACOE)

Earthquake of

28

February 1990

2343

G.

m.t.

L 118

V Up

T 02

8

Sens. =2.00 cm/g

Freq.

= 25.1 Hz

Damp

. =0.59 cr

it

Sens. =2.00 cm/g

Freq.

= 25.4

Hz

Damp.

= 0.

61 cr

it

Sens. =2.00 cm/g

Freq

. =

25.2

Hz

Damp. =0.59 crit

0.04

g

0.04

g

0.03 g

Epicentral di

stan

ce =

35 km

Film speed

= 1 cm/sec

U.S. STRONG-MOTION

NETWORK

DIRECTION

CONS

TANT

SMAX. ACCELERATION

Station

No.

33.8

90 N,

Br

ea Da

m Cr

est

SMA

# 386

951

117.925

W

(ACO

E)

Eart

hqua

ke of

28

Fe

brua

ry 1990

2343

G.

m.t.

Epic

entr

al di

stan

ce =

35 km

L 13

0*

V Up

T 40*

Sens

. =2.00 cm/g

Freq

. =

25.3

Hz

Da

mp.

= 0.6

crit

Sens

. =

1.96 cm/g

Freq

. =

25.8 Hz

Damp

. =

0.6

crit

Sens

. =

1.90

cm

/gFr

eq.

= 25.7 Hz

Damp

. =

0.6

crit

Film

sp

eed

« 1 cm

/sec

0.08 g

0.04 g

0.09 g


DIRECTION

CONSTANTS

MAX. ACCELERATION

to

Station No

. 95

133

.890

N,

117.

924 W

Brea

Dam

Left abutment

SMA

# 38

5 (ACOE)

Earthquake of

28

February 19

90

2343 G.

m.t.

Epicentral di

stan

ce =

35 km

L 130'

V Up

T 40

C

Sens.

= 1.90 cm

/gFreq.

= 25.9

Hz

Damp.

= 0.

6 crit

Sens. =2.02 cm

/gFreq.

= 24

.8 Hz

Damp

. =

0.6

crit

Sens.

= 1.

95 cm/g

Freq.

= 25

.2 Hz

Damp.

= 0.6

crit

Film sp

eed

= 1 cm/sec

0.06

g

0.02

g

0.04 g


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station No.

951

L 130°

Sens. =1.95 cm/g

0.06 g

33.889 N,

117.

926

W Freq.

= 26.2 Hz

Brea Dam

Damp. =0.6

crit

Downstream

SMA

# 387

(ACOE)

V Up

Sens. =2.00 cm/g

0.04 g

Freq.

- 25.7 Hz

Da

mp.

= 0.6

crit

Earthquake of

28 February 1990

T 40°

Sens. =1.85 cm/g

0.06 g

2343

G.

m.t.

Freq.

= 26.0 Hz

Damp. =0.6

crit


35 km

Film speed

= 1 cm/sec

GJ

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Station

No.

804

33.9

77 N,

118.

036

WWhittier,

7215 Bright Av

e.Basement

SMA

# 10

69

(Code/USGS)

Earthquake of

28 February 1990

2343

G.m.t.

L 180

V Up

T 090

Sens.

= 1.78 cm/g

Freq.

= 25

.9 Hz

Damp

. =

0.6

crit

Sens. =1.89 cm/g

Freq.

= 25

.1 Hz

Damp

. =

0.6

crit

Sens.

Freq.

Damp

.

1.90 cm/g

25.1 Hz

0.6

crit


36 km

Film speed

= 1 cm/sec

U.S. STRONG-MOTION

NETWORK

Stat

ion No.804

33.977 N,

118.036 W

Whit

tier

, 7215 Bright Ave.

10th fl

oor

SMA

# 10

71

(Cod

e/US

GS)

Eart

hqua

ke of

28 February 1990

2343

G.

m.t.

Epic

entr

al di

stan

ce =

36 km

DIRE

CTIO

N

L 18

0

V Up

T 09

0

CONSTANTS

MAX. AC

CELE

RATI

ON

Sens.

= 1.84 cm

/gFr

eq.

= 26.1 Hz

Damp

. =

0.6

crit

Sens.

= 1.85 cm/g

Freq

. =

25.5

Hz

Damp

. =

0.6

crit

Sens.

= 1.89 cm/g

Freq

. «

25.1 Hz

Damp

. -

0.6

crit

Film

speed

= 1 cm/sec

03

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Q\

t Wl I

II I

Station No.

5031

L

300

Sens.

= 1.

84 cm/g

0.07 g

34.4

4 N,

117.85

W

Freq.

= 26.1 Hz

Valyermo Forest Station

Damp

. =

0.6

crit

Ground

V Up

Sens. =1.85 cm/g

0.04 g

SMA-

1 #

1512

(USG

S)

Freq.

= 25

.6 Hz

Damp

. =

0.6

crit

Earthquake of

28 February 19

90

T 21

0 Sens. =1.90 cm/g

0.06

g

2343 G.

m.t.

Freq.

= 25

.4 Hz

(WWV

B tr

igge

r time)

Damp. =0.6

crit

Epicentral di

stan

ce =

36 km

Film sp

eed

= 1 cm/sec

U.S. ST

RONG

-MOT

ION

NETWORK

DIRE

CTIO

N CO

NSTA

NTS

MAX. ACCELERATION

Station

No.

5269

L

360

Sens. =1.84 cm

/g

0.05 g

34.0

86 N,

117.309 W

Freq

. -

25.5 Hz

San

Bern

ardi

no Array:

Damp

. =

0.6

crit

San

Bern

ardi

no Valley Co

lleg

eGr

ound

V

Up

Sens. =1.91 cm

/g

0.05 g

SMA-

1 #1

080

(USG

S)

Freq

. =

25.2 Hz

Damp

. =

0.6

crit

Eart

hqua

ke of

28 Fe

brua

ry 1990

T 27

0 Sens. =1.77 cm

/g

0.05

g

2343

G.

m.t.

Fr

eq.

= 25

.6 Hz

Damp

. =0.6

crit

Epic

entr

al di

stan

ce *

37 km

Film

speed

= 1 cm/sec

U.S.

STRONG-MOTION NE

TWOR

KDI

RECT

ION

CONS

TANT

SMAX. ACCELERATION

Stat

ion

No.

754

34.064 N,

117.297

WCo

lton

In

terc

hang

e1-

10/2

15Gr

ound

SMA-

1 #414

(CDO

T)

Eart

hqua

ke of

28 February 1990

2343

G.

m.t.

Epic

entr

al di

stan

ce =

38 km

L 082

V Up

T 352

Sens

. =

1.90 cm/g

Freq

. =

25.9 Hz

Damp

. «=

0.6

crit

Sens

. =

1.80 cm

/gFr

eq.

= 26

.5 Hz

Damp

. =

0.6

crit

Sens

. =

1.80

cm/g

Freq

. =

26.0

Hz

Damp

. =

0.6

crit

Film

speed

= 1 cm/sec

0.07 g

0.03

g

0.07 g

00

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Station

No.

754

34.064 N,

117.297

WColton Interchange

1-10

/215

Bridge ce

llSM

A-1 #415

(CDOT)

Earthquake of

28

February 1990

2343

G.

m.t.

Epicentral di

stan

ce =

38 km

L 08

2

V Up

T 35

2

Sens.

= 2.

05 cm/g

Freq.

= 24.7 Hz

Damp.

= 0.6

crit

Sens.

= 1.

75 cm

/gFreq.

= 26.3 Hz

Damp

. =

0.6

crit

Sens.

= 1.80 cm/g

Freq.

- 26.3 Hz

Damp

. «=

0.6

crit

Film speed

= 1 cm/sec

0.25 g

0.06

g

0.07

g

CO

,*.. .

^J«...

.l....

.«fc._

i..


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Stat

ion

No.

5267

34.183 N,

117.295

WSan

Bernardino Ar

ray,

5931

F

St,

Grou

ndSM

A #

4905

(U

SGS)

Eart

hqua

ke of

28 Fe

brua

ry 1990

2343

G.

m.t.

(W

WVB

trigger

time

)

Epic

entr

al distance =

38 km

L 36

0

V Up

T 270

Sens

. Fr

eq.

Damp

.

Sens.

Freq

. Damp.

1.67 cm

/g

27.0

Hz

0.6

crit

1.87

cm/g

26.2

Hz

0.6

crit

Sens

. =

1.71

cm

/gFr

eq.

- 26

.9 Hz

Damp.

= 0.6

crit

Film

speed

= 1 cm

/sec

U.S.

STRONG-MOTION

NETWORK

DIRE

CTIO

N CO

NSTA

NTS

MAX. AC

CELE

RATI

ON

Station

No.

5245

L 090

Sens

. =1.80 cm/g

34.1

06 N,

117.

287

W

Freq

. =

25.5 Hz

Sa

n Be

rnar

dino

Co

unty

Da

mp.

= 0.

6 crit

Gove

rnme

nt Center

Base

ment

SW

V

Up

Sens

. =

1.96 cm

/g

SMA-

1 #

1462

(U

SGS)

Fr

eq.

= 24

.7 Hz

Damp

. =

0.6

crit

Eart

hqua

ke of

28 Fe

brua

ry 1990

T 36

0 Se

ns. =1.76 cm

/g

2343 G.

m.t.

Fr

eq.

- 26

.4 Hz

Damp

. =0.6

crit

Epic

entr

al di

stan

ce =

38 km

Fi

lm speed

= 1 cm/sec

U.S. STRONG-MOTION

NETW

ORK

DIRECTION

CONSTANTS

MAX.

AC

CELE

RATI

ON

Station

No.

5245

34

.106

N,

117.287

W

San

Bern

ardi

no Co

unty

Go

vern

ment

Center

Grou

nd si

te

SMA-

1 #4

904

(USG

S)

Eart

hqua

ke of

28 Fe

brua

ry 1990

2343

G.

m.t.

(W

WVB

trig

ger

time

)

Epic

entr

al distance =

38 km

L 36

0

V Up

T 270

Sens

. =

1.88 cm/g

Freq

. =

25.9 Hz

Damp

. =

0.6

crit

Sens

. =

1.88 cm/g

Freq

. =

26.0 Hz

Damp

. =

0.6

crit

Sens

. =

1.77

cm/g

Freq

. =

26.3 Hz

Damp

. =

0.6

crit

Film

sp

eed

= 1 cm/sec

cn

to


CH.

DIRECTION

LOCATION

SENS

ITIV

ITY

MAX. AC

CELE

RATI

ON

Station

No.

5245

34.106

N,

11

7.28

7 W

San

Bern

ardi

no

Coun

ty Go

vern

ment

Center

Stru

ctur

e Ar

ray

CRA

# 30

2 (U

SGS)

Earthq

uake

of

28 February 19

90

03

2343 G.

m.t.

CO

(WWV

B trigger

time)

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

360

090

360

090

090

360

090

360

090

360

090

360

2nd

floo

r NW

2nd

floor

NE

2nd

floor

NE

2nd

floo

r SW

4th

floor

SW

4th

floor

NW

Roof

(6th)

NE

Roof

(6th)

NW

Roof (6th)

SW

Roof

(6th)

NE

4th

floor

NE

4th

floo

r NE

1.82 cm/g

1.97

1.83

1.89

1.88

1.80

1.90

1.91

1.90

1.90

1.81

1.94

it * *

0.05 g

0.05 g

0.07

g

0.09 g

0.08

g

0.08 g

0.07

g

0.07

g

0.05 g

Epic

entr

al di

stan

ce =

38 km

Film

sp

eed

= 1 cm/sec

[See

accelerogram on

next pa

ge]

San

Bern

ardi

no Co

. Go

vt.

Cntr

. CR

A-1

#302

(U

SGS)

ui7 8 9 10 11

U.S.

ST

RONG

-MOT

ION

NETW

ORK

DIRECTION

CONSTANTS

MAX.

AC

CELE

RATI

ON

01 01

Station

No.

33.8

52 N,

Lake Ma

thew

s Dike

toe

SMA

# 10

50

707

117.451

W

(MWD)

Eart

hqua

ke of

28

February 1990

2343

G.

m.t.

Epic

entr

al distance =

39 km

L 252

V Up

T 16

2

Sens.

= 1.95 cm/g

Freq

. =

24.9

Hz

Damp

. =0.6

crit

Sens

. =

1.95 cm

/gFr

eq.

= 25

.4 Hz

Damp

. =0.6

crit

Sens. =1.82 cm/g

Freq

. =

26.0 Hz

Damp

. =

0.6

crit

Film

speed

= 1 cm/sec

0.05 g

0.04

g

0.06 g

U.S.

ST

RONG

-MOT

ION

NETWORK

DIRE

CTIO

NCONSTANTS

MAX. ACCELERATION

Stat

ion

No.

709

34.0

48 N,

118.

111

W

Garv

ey Re

serv

oir

Abutment Building

SMA

# 10

55

(MWD)

Eart

hqua

ke of

28 Fe

brua

ry 1990

2343 G.

m.t.

L 11

4

V Up

T 024

Sens

. =

1.84 cm/g

Freq

. =

25.5

Hz

Damp

. =0.6

crit

Sens

. =

1.90 cm/g

Freq

. =

25.1

Hz

Damp

. =

0.6

crit

Sens

. =1.90 cm/g

Freq

. =

25.8

Hz

Damp

. =0.6

crit

Epic

entr

al distance =

39 km

Film sp

eed

= 1 cm/sec


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Stat

ion

No.

709

34.0

50 N,

11

8.11

4 W

Garvey Reservoir

Cres

tSMA #

6698

(MWD)

Earthquake of

28

February 1990

2343 G.m.t.

Epicentral distance *

39 km

L 114

V Up

T 02

4

Sens.

Freq.

Damp

.

2.00 cm/g

25.6

Hz

0.62 crit

Sens.

* 2.00 cm/g

Freq.

= 25

.2 Hz

Damp

. =

0.62 crit

Sens.

= 1.76 cm/g

Freq.

= 26.2 Hz

Damp

. =

0.55 crit

Film speed

* 1 cm

/sec

cn

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Sta

tion

No.

T

emp.

34

.137°

No

rth

, 11

8.12

7°

Wes

tP

asad

ena

(CIT

)52

5 So

uth

Wilson Ave.

SMA-

1 #4

791

(USG

S)

Earthquake of

28 February 19

90

2343 G.

m.t.

Epicentral di

stan

ce =

40 km

L 360'

V Up

T 27

0*

Sens.

= 1.

71 cm/g

Freq.

-Damp.

= 0.

6 cr

it

Sens.

= 1.79 cm

/gFreq.

=Damp.

= 0.6

crit

Sens.

= 1.

86 cm/g

Freq.

=Damp.

= 0.6

crit

Film speed

- 1 cm/sec

0.05

g

01 00

U.S.


DIRECTION

CONSTANTS

MAX. ACCELERATION

cn CO

Stat

ion

No.

634

33.917 N,

118.

067

WNorwalk, 12

400

Imperial Highway

North ground site

SMA #

419

(USG

S/BE

CH)

Earthquake of

28 February 1990

2343

G.

m.t.


42 km

L 090

V Up

T 360

Sens.

Freq.

Damp.

Sens.

Freq.

Damp.

Sens.

Freq.

Damp.

= = ~ = = = = = =

1.95

25.0

0.55

1.68

26.3

0.57

1.87

25.6

0.57

cm/g

Hz crit

cm/g

Hz crit

cm/g

Hz crit

* * *

Film speed

= 1 cm/sec

U.S.


DIRECTION

CONSTANTS

MAX. ACCELERATION

O) o

Station No

. 63

4 L

090

Sens. =1.83 cm/g

33.915 N,

118.067

W

Freq.

- 26

.0 Hz

Norw

alk,

12

400

Imperial Highway

Damp

. =0.6

crit

South

grou

nd site

SMA #

823

(USGS/BECH)

V Up

Sens. =1.76 cm

/gFreq.

= 25.9 Hz

Damp

. =

0.6

crit

Earthquake of

28 February 19

90

T 360

Sens. =1.88 cm

/g

2343

G.

m.t.

Freq.

- 25.9 Hz

Damp.

= 0.6

crit

Epicentral di

stan

ce =

42 km

Film sp

eed

= 1 cm/s

ec


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station No.

634

L 09

0 Sens. =1.75 cm

/g

33.916 N,

118.067

W

Freq.

= 27

.1 Hz

Norwalk, 12400

Impe

rial

Highway

Damp. =0.6

crit

Basement

SMA

# 424

(USGS/BECH)

V Up

Sens. =1.95 cm

/gFreq.

= 25.3

Hz

Damp.

= 0.

6 cr

it

Earthquake of

28 February 1990

T 36

0 Sens. =1.80 cm

/g

2343 G.m.t.

Freq.

= 25.3 Hz

Damp

. -

0.6

crit


42 km

Film sp

eed

= 1 cm/sec

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

O) to

Station

No.

634

33.9

16 N,

11

8.06

7 W

Norw

alk,

12

400

Imperial Hi

ghwa

y4t

h fl

oor

SMA

# 42

5 (USGS/BECH)

Earthquake of

28

February 1990

2343 G.m.t.

Epicentral di

stan

ce =

42 km

L 090

V Up

T 360

Sens.

= 1.80 cm

/g

Freq.

= 26

.3 Hz

Damp.

= 0.

6 cr

it

Sens.

= 1.95 cm/g

Freq.

= 25

.0 Hz

Damp.

= 0.

6 cr

it

Sens. =1.82 cm/g

Freq.

= 26.6

Hz

Damp.

= 0.

6 cr

it

Film sp

eed

= 1 cm/sec

0)

GO

U.S.

ST

RONG

-MOT

ION NE

TWOR

K DI

RECT

ION

Station

No.

634

L 09

033

.916

N,

118.067

WNo

rwal

k, 12

400

Impe

rial

Highway

Roof

(8)

SMA

# 41

8 (USGS/BECH)

V Up

Eart

hqua

ke of

28 February 19

90

T 36

023

43 G.

m.t.

Epic

entr

al di

stan

ce =

42 km

CONSTANTS

MAX. ACCELERATION

Sens

. =

Freq

. =

Damp

. =

Sens

. =

Freq

. =

Damp .

=

Sens

. =

Freq

. =

Damp

. =

Film

speed

=

1.90 cm

/g

0.06 g

25.7

Hz

0.6

crit

2.00

cm/g

*24.8 Hz

0.6

crit

1.90

cm

/g

0.06

g

26.1 Hz

0.6

crit

1 cm/sec

U.S. ST

RONG

-MOT

ION

NETWORK

DIRECTION

CONS

TANT

S MA

X. AC

CELE

RATI

ON

Stat

ion

No.

5239

L

090

Sens. =1.80 cm

/g

33.917 N,

11

8.06

5 W

Freq

. =

26.1 Hz

No

rwal

k, 12

440

Impe

rial

Highway

Damp

. =

0.59

crit

Nort

h gr

ound

si

teSM

A #

824

(USG

S/BE

CH)

V Up

Se

ns. =1.82 cm/g

Freq

. =

25.4 Hz

Da

mp.

= 0.

61 crit

Eart

hqua

ke of

28 Fe

brua

ry 19

90

T 360

Sens. =1.80 cm/g

2343

G.

m.t.

Fr

eq.

= 26

.0 Hz

Damp

. =

0.59 crit

Epic

entr

al distance =

42 km

Film speed

= 1 cm/sec

U.S. STRONG-MOTION

NETW

ORK

DIRE

CTIO

N CO

NSTA

NTS

MAX. AC

CELE

RATI

ON

O>

cn

Station

No.

5239

L 09

0 Se

ns. =1.85 cm

/g

33.915 N,

118.

066 W

Freq

. =

25.3

Hz

Norwalk, 12

440

Imperial Highway

Damp

. =

0.55 cr

it

Sout

h gr

ound

site

SMA

# 92

2 (U

SGS/

BECH

) V

Up

Sens

. =1.83 cm

/gFr

eq.

= 26.4 Hz

Damp

. =0.55 crit

Eart

hqua

ke of

28 Fe

brua

ry 1990

T 36

0 Se

ns. =1.93 cm

/g

2343

G.

m.t.

Fr

eq.

= 25.4 Hz

Damp

. =0.53 cr

it

Epic

entr

al di

stan

ce =

42 km

Fi

lm speed

= 1 cm/sec

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

O)

O)

Stat

ion

No.

5239

L

090

Sens.

=* 1.76 cm/g

33.9

17 N,

118.

066 W

Freq.

= 26

.3 Hz

Norw

alk,

12

440

Imperial Highway

Damp

. =

0.63 crit

Base

ment

SMA

# 2218

(USGS/BECH)

V Up

Sens. =1.88 cm/g

Freq.

= 25.8 Hz

Da

mp. =0.62 cr

it

Earthquake of

28 February 1990

T 360

Sens.

- 1.71 cm/g

2343 G.

m.t.

Freq.

= 26.4 Hz

Damp

. -

0.60 cr

it

Epicentral di

stan

ce =

42 km

Film sp

eed

= 1 cm

/sec

0)

U.S.

ST

RONG

-MOT

ION

NETWORK

Station

No.

5239

33.917°

Nort

h,

118.

066°

We

st

NORWALK

12440

Impe

rial

Highway

Stru

ctur

e Array

#1

CRA-

1 #1

27

(USGS/BECHTEL)

Eart

hqua

ke of

28 Fe

brua

ry 1990

2343 G.

m.t.

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

DIRE

CTIO

N

90°

90°

90°

90°

180°

180° Up 90°

180° Up 90°

180°

LOCATION

9th

Level

(Roo

f),

Bldg

. Ce

nter

6th

Level,

Bldg

. Ce

nter

3rd

Level,

Bldg

. Ce

nter

2nd

Level,

Bldg

. Center

1st

Level

(Bas

emen

t) ,

East

end

6th

Level,

Bldg

. We

st-C

ente

r1s

t Level

(Basement) ,

Bldg

. Center

1st

Level

(Bas

emen

t) ,

Bldg

. Ce

nter

1st

Level

(Basement),

Bldg

. Ce

nter

Downhole (30

1),

Bldg

. Ce

nter

Downhole (30

1),

Bldg

. Ce

nter

Downhole (30

1),

Bldg

. Center

SENS

ITIV

ITY

1.75

1.83

1.80

1.72

1.94

1.77

1.92

1.88

1.93

1.85

1.91

1.90

MAX. ACCELERATION

0.05

g

* * * * * * * * * * *

Epic

entr

al di

stan

ce =

42 km

Film

sp

eed

= 1 cm

/sec

[See ac

cele

rogr

am on next pa

ge]

Norwal

k, 12

440

Imperial Hi

ghwa

y CR

A-1

#127

(U

SGS/

BECH

TEL)

Structural Ar

ray

#1

5- 6- 7-

O>

008- 9-

10-

11-

12- SdV-


CH.

DIRECTION

LOCATION

SENSITIVITY

MAX. ACCELERATION

<o

Stat

ion

No.

5239

33.917°

Nort

h,

118.066° West

Norwalk

1244

0 Im

peri

al Highway

Stru

ctur

e Array #2

CRA-

1 #128

(USG

S/BE

CHTE

L)

Earthquake of

28 February 1990

2343

G.

m.t.

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

180°

180°

180°

180°

180°

180°

180°

180°

180°

180°

180°

180°

9th

Level (R

oof)

,Ea

st en

d6th

Level,

East

en

d3r

d Level,

East

end

2nd

Level,

East

end

9th

Level, (Roof)

Bldg.

Cent

er6t

h Level,

Bldg

. Center

3rd

Level,

Bldg

. Center

2nd

Level,

Bldg

. Center

9th

Level, (Roof)

West end

6th

Level,

West en

d3rd

Level,

West en

d2n

d Level,

West

end

1.95

1.87

1.98

1.87

1.88

1.92

1.91

1.85

1.86

1.84

1.91

1.85

0.06 g

* * *

0.06

g

* * *

0.06 g

* * *


42 km

Film sp

eed

= 1 cm/sec

[See

accelerogram on next page]

2- 3- 4- 5- 6- 7-

vj o

8- 9- 10-

11-

12-

No

rwal

k,

1244

0 Im

peri

al

Hig

hway

C

RA

-1

#128

(U

SGS/

BE

CH

TE

L)

Str

uctu

ral

Arr

ay

#2

nw

nn

juw

w^

^

I t

U.S.

STRONG-MOTION

NETWORK

DIRECTION

CONSTANTS

MAX. ACCELERATION

Stat

ion

No.

129

L 360

34.0

50 N,

117.263

WLo

ma Linda

Medical

Cent

erGr

ound

V

UpSM

A-1

#813

(USG

S)

Sens.

Freq

.Da

mp.

Sens

.Fr

eq.

Damp

.

=1.85 cm/g

= 25

.8 Hz

= 0.

6 crit

=1.85 cm/g

= 25

.8 Hz

=0.6

crit

* *

Eart

hqua

ke of

28 February 19

90

2343 G.

m.t.

T 27

0Se

ns.

= 1.

85 cm/g

Freq

. =

24.9 Hz

Damp

. =

0.6

crit

Epic

entr

al di

stan

ce =

42 km,

Film

sp

eed

= 1 cm

/sec

U.S.


CH.

DIRECTION

LOCATION

SENSITIVITY

MAX. ACCELERATION

to

Station No.

482

34.085 N,

118.149

W

Alhambra

900

South Fr

emon

t Avenue

Stru

ctur

e Array

CRA #

316

(USGS)

Earthquake of

28 February 1990

2343

G.m.t.

(WWVB

trigger time)

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

360

090

090

090

360

090

090

360

090

360

UP 090

12th fi

r, cn

tr

12th

fir, cn

tr

12th fir, No

. en

d

6th

fir,

cn

tr

6th

fir,

cn

tr

6th

fir,

No

. end

2nd

fir,

cn

tr

2nd

fir, cn

tr

2nd

fir,

No.

end

Bsmt ,

cntr

Bsmt,

cntr

Bsmt

, cn

tr

1.79

cm

/g

*

1.88

cm

/g

*

1.76

cm

/g

*

1.81

cm/g

*

1.72

cm/g

*

1.84

cm

/g

*

1.76

cm

/g

0.06

g

1.77

cm/g

*

1.73

cm

/g

*

1.83

cm

/g

*

1.84

cm/g

*

1.83

cm

/g

*


42 km

Film sp

eed

= 1 cm/sec

[See


Alha

mbra

, 90

0 So

uth

Fremont

Ave.

CR

A-1

#316

(USGS)

3- 4- 5- 6-

OJ

8- 9- 10-

11-

12-


CH.

DIRECTION

LOCATION

SENSITIVITY

MAX.

ACCELERATION

Station No

. 5229

34.0

50 N,

117.249

W

Loma Linda

VA Hospital

Stru

ctur

e Array

CRA #

230

(VA)

Earthquake of

28 February 1990

2343

G.m.t.

1 2 3 4 5 6 7 8 9

Down

180

270

270

270

180

270

180

270

Ground fl

oor

ctr

Ground fl

oor

ctr

Ground fl

oor

ctr

4th floor

center

Ground fl

oor

north

4th

floo

r ce

nter

4th

floo

r north

Ground fl

oor

south

4th

floo

r south

1.80

cm/g

1.83

1.80

1.85

1.83

1.83

1.85

1.83

1.85

* *

0.06

g

0.15 g

0.07 g

0.11 g

0.12

g

*

0.11 g


43 km

Film sp

eed

= 1 cm/sec

[See


Loma Linda V.A. Hospital

CRA-

1 #230

(VA)

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Station No

. 52

2934

.051

N,

117.

248 W

Loma Linda

Veterans Administration Hospital

Ground si

te north

SMA-1

// 4233

(USG

S)

Earthquake of

28 February 1990

2343

G.m.t.

(WWV

B tr

igge

r time)


43 km

L 36

0

V Up

T 270

Sens. =1.92 cm/g

Freq.

= 25.2

Hz

Damp.

= 0.6

crit

Sens.

= 2.03 cm/g

Freq.

= 25.0 Hz

Damp. =0.6

crit

Sens

. =1.83 cm/g

Freq.

= 26.2

Hz

Damp. =0.6

crit

Film sp

eed

= 1 cm/sec

0.05 g

0.04

g

0.04

g

O)


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station

No.

5229

34.049 N,

117.

250

WLoma Linda

Vete

rans

Administration Hospital

Ground si

te so

uth

SMA-

1 #

4234

(USGS)

Earthquake of

28

February 19

90

2343

G.m.t.

(WWV

B trigger

time)


43 km

L 360

V Up

T 27

0

Sens.

= 1.

81 cm/g

Freq.

- 26

.4 Hz

Damp.

= 0.6

crit

Sens.

= 1.

86 cm/g

Freq.

= 25

.2 Hz

Damp

. =

0.6

crit

Sens.

= 1.82

cm/g

Freq.

= 25

.5 Hz

Damp.

= 0.6

crit

Film speed

= 1 cm

/sec

0.06 g

0.03 g

0.06

g

«W0MMM»M»<»* (l

MM*

«»

* >

I >»

IMMVWB<


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station No

. 5279

L 360

Sens

. =1.78 cm/g

34.084 N,

11

8.15

9 W

Freq.

= 25

.8 Hz

Alhambra,

3213 Norwich AVQ.

Damp. =0.6

crit

Ground

SMA

# 14

18

(USGS)

V Up

Sens

. *=1.76 cm/g

Freq.

= 26.0 Hz

Damp. =0.6

crit

Earthquake of

28 February 1990

T 270

Sens. =1.79 cm/g

2343 G.m.t.

Freq.

= 26.2 Hz

Damp.

= 0.6

crit


43 km

Film sp

eed

= 1 cm

/sec

GO

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Station No

. 52

7533

.920

N,

117.320 W

Mills Filter Pl

ant

Ground

SMA

# 6695

(MWD)

Earthquake of

28 February 1990

2343 G.

m.t.

Epicentral di

stan

ce =

43 km

L 360

V Up

T 270

Sens.

Freq.

Damp

.

Sens.

Freq.

Damp.

1.93

cm/g

25.6

Hz

0.6

crit

1.98 cm/g

25.0 Hz

0.

6 crit

Sens.

= 1.94 cm/g

Freq.

= 25

.5 Hz

Damp.

= 0.6

crit

Film speed

= 1 cm/sec

CO


DIRECTIONS

CONSTANTS

MAX. ACCELERATION

Station

No.

5129

33.9

96°

North,

118.162° We

stLOS

ANGELES BULK MAIL FACILITY

Ground

SMA-

1 #1

295

(USGS)

Earthquake of

28 February 1990

2343

G.

m.t.


45 km

L 360

(

V Up

T 27

0'

Sens. =1.80 cm/g

Freq.

= 25

.6 Hz

Damp.

= 0.

6 cr

it

Sens.

= 1.

86 cm/g

Freq.

= 25

.6 Hz

Damp.

= 0.

6 crit

Sens.

= 1.

88 cm/g

Freq.

= 26

.3 Hz

Damp.

= 0.

6 cr

it

Film sp

eed

» 1 cm/sec

0.06 g

00 O

U.S.

STRONG-MOTION

NETWORK

DIRECTION

CONSTANTS

MAX. AC

CELE

RATI

ON

Station

No.

281

33.751 N,

117.870 W

Sant

a An

aOran

ge Co

unty

En

gine

erin

g Bldg,

Basement

RFT-

250

# 510

(USG

S)

Eart

hqua

ke of

28

Fe

brua

ry 1990

2343 G.

m.t.

Epic

entr

al di

stan

ce =

46 km

L 360

V Up

T 27

0

Sens

. Fr

eq.

Damp

.

Sens

. Fr

eq.

Damp

.

1.74 cm/g

21.6 Hz

0.63 cr

it

1.80 cm/g

22.1 Hz

0.60 crit

Sens

. =1.80 cm

/gFr

eq.

= 21

.7 Hz

Damp

. =0.60 crit

Film

sp

eed

= 1 cm/sec

00

U.S.


DIRECTION

CONSTANTS

MAX. ACCELERATION

00

to

Station No

. 5037

34.004 N,

117.223 W

Rech

e Ca

nyon

Oliv

e Dell Ranch

Grou

ndSM

A-1

# 15

14

(USG

S)

Earthquake of

28

February 1990

2343

G.m.t.

(WWVB

trigger time)

Epicentral di

stan

ce =

47 km

L 360

V Up

T 270

Sens.

= 1.78 cm

/gFreq.

- 25.9 Hz

Damp. =0.6

crit

Sens

. =

1.80 cm

/gFr

eq.

- 25

.9 Hz

Damp.

= 0.6

crit

Sens.

= 1.

82 cm/g

Freq.

= 26.1 Hz

Damp.

= 0.6

crit

Film speed

= 1 cm

/sec

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

00

CO

Station No

. 5030

L 30

0 Sens. =1.82 cm

/g

0.09

g

34.5

2 N,

117.99

W

Freq.

= 26.1 Hz

Littlerock Po

st Of

fice

Da

mp. =0.6

crit

Ground

V Up

Sens. =1.78 cm/g

0.02 g

SMA-

1 #

1521

(USGS)

Freq.

= 26

.0 Hz

Damp

. =

0.6

crit

Earthquake of

28 Fe

brua

ry 19

90

T 21

0 Se

ns. =1.83 cm

/g

0.10 g

2343 G.

m.t.

Fr

eq.

= 25.6 Hz

(WWV

B trigger

time

) Da

mp. =0.6

crit

Epic

entr

al di

stan

ce =

50 km

Film sp

eed

= 1 cm/sec


DIRECTION

CONSTANTS

MAX. ACCELERATION

Station No

. 5287

33.677 N,

117.

869

W

Orange County

John Wayne Airport

SMA

# 2017

(USGS)

EARTHQUAKE OF

28 February 1990

2343

G.m.t.


54 km

L 360

V Up

T 270

Sens.

= 1.

82 cm

/gFreq.

= 25.3 Hz

Damp

. =

0.6

crit

Sens.

= 1.69 cm

/gFreq.

= 27

.0 Hz

Damp.

= 0.6

crit

Sens.

» 1.91 cm

/gFreq.

= 25.6 Hz

Damp. =0.6

crit

Film sp

eed

= 1 cm/sec

00


DIRECTION

CONSTANTS

MAX.

ACCELERATION

00 O3

Stat

ion

No.

141

34.118°

North,

118.

299°

We

stLOS

ANGELES, GR

IFFI

TH PA

RKGr

ound

RFT-250

s/n

351

(USG

S)

Eart

hqua

ke of

28 February 1990

2343 G.

m.t.

Epic

entr

al di

stan

ce =

55 km

L 360*

V Up

T 270*

Sen. =1.88 cm/g

Freq

=

20.6 Hz

Da

mp =0.6

crit

Sen.

Freq

Da

mp

Sen.

Fr

eq

Damp

1.89

cm

/g

21.5

Hz

0.6

crit

1.90 cm

/g

21.7 Hz

0.6

crit

Film sp

eed

= 1 cm/sec

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

00

0)

Stat

ion

No.

5106

33.777 N,

118.115

W

Long Beach VA Hospital

Ground si

te

SMA

# 17

31

(USGS)

Earthquake of

28

February 19

90

2343 G.m.t.


56 km

L 360

V Up

T 270

Sens

. =

1.90 cm

/g

Freq.

= 25.4 Hz

Damp.=0.6

crit

Sens.

= 1.

77 cm

/gFreq.

= 25.9 Hz

Damp. =0.6

crit

Sens

. =

1.76

cm/g

Freq.

= 26.2 Hz

Damp. =0.6

crit

Film speed

= 1 cm/s

ec

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Stat

ion

No.

5106

33.778 N,

118.

118

WLong Beach VA Hospital

Basement

SMA

# 84

5 (V

A)

Earthquake of

28

February 19

90

2343 G.

m.t.

Epicentral di

stan

ce =

56 km

L 360

V Up

T 27

0

Sens.

= 1.

83 cm

/gFreq.

= 25

.6 Hz

Damp. =0.55 cr

it

Sens.

= 1.

95 cm

/gFreq.

= 26.3 Hz

Damp

. =0.57 cr

it

Sens. =2.00 cm/g

Freq.

= 25

.0 Hz

Damp

. =0.59 cr

it

Film sp

eed

= 1 cm/sec

0.02

g

0.02

g

0.02 g

00

U.S.


DIRECTION

CONSTANTS

MAX. ACCELERATION

00 00

Station No.

5106

33.7

78 N,

118.118 W


6th

floo

r SMA

# 80

9 (V

A)

Earthquake of

28 February 19

90

2343 G.m.t.

Epicentral di

stan

ce =

56 km

L 36

0

V Up

T 270

Sens.

= 1.

78 cm/g

Freq.

- 26.3

Hz

Damp. =0.57 cr

it

Sens.

= 1.

95 cm

/gFreq.

= 25

.6 Hz

Damp.

= 0.57 cr

it

Sens.

* 1.

85 cm/g

Freq.

= 25

.6 Hz

Damp

. =0.59 cr

it

Film sp

eed

» 1 cm/sec

0.03

g

0.02

g

0.04

g

U.S.


DIRECTION

CONS

TANT

S MA

X. ACCELERATION

00

CD

Station No.

5106

L 360

Sens.

= 1.

88 cm

/g

0.04 g

33.778 N,

118.118 W

Freq.

= 25.6 Hz


Damp. =0.50 cr

it

llth fl

oor

SMA

# 74

9 (V

A)

V Up

Sens. =1.81 cm

/g

0.04 g

Freq.

= 26.3 Hz

Damp. =0.53 crit

Earthquake of

28 February 19

90

T 27

0 Sens. =1.77 cm/g

0.07

g

2343 G.m.t.

Freq.

= 27.0 Hz

Damp.

= 0.

50 crit


56 km

Film sp

eed

= 1 cm/sec

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

CO o

Stat

ion

No.

5257

33.620 N,

117.844

W

San

Joaquin Reservoir

Left abutment

SMA

# 42

22

(USGS)

Earthquake of

28

February 1990

2343 G.

m.t.


59 km

L 087

V Up

T 357

Sens.

= 1.

82 cm/g

Freq.

= 25.5 Hz

Damp.

= 0.

6 crit

Sens.

= 1.

74 cm/g

Freq.

= 26

.0 Hz

Damp. =0.6

crit

Sens. =1.89 cm

/gFreq.

- 25.5 Hz

Damp.

= 0.

6 crit

Film sp

eed

= 1 cm/sec

U.S.

ST

RONG

-MOT

ION

NETWORK

DIRE

CTIO

NCO

NSTA

NTS

MAX. AC

CELE

RATI

ON

Station

No.

5257

33.6

20 N,

117.

842 W

San

Joaquin

Reservoir

Cres

tSMA

# 6697

(MWD)

Eart

hqua

ke of

28

February 1990

2343

G.

m.t.

L 08

7

V Up

T 35

7

Sens

. =1.82 cm/g

Freq

. =

26.2 Hz

Damp

. =0.57 crit

Sens

. =

2.04 cm/g

Freq

. =

25.2 Hz

Damp

. =0.57 cr

it

Sens

. =

1.86

cm/g

Freq

. =

25.7

Hz

Damp

. =

0.61 crit

Epic

entr

al di

stan

ce =

59 km

Film

sp

eed

= 1 cm/sec

CO

CO

U.S. STRONG-MOTION

NETWORK

Stat

ion

No.

5246

33.618°

North,

117.878° West

Newport

Beac

h840

Newport

Center Dr

ive

Stru

ctur

e ar

ray

CRA-

1 #231

Eart

hqua

ke of

28

Fe

brua

ry 1990

2343 G.

m.t.

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

DIRECTION

360° Up 090°

360°

360°

090°

090°

090°

090°

360°

270°

360°

LOCA

TION

Tower

2, Level

1 Center,

Gara

ge

Tower

2, Level

1 Ce

nter

, Ga

rage

Tower

2, Le

vel

1 Ce

nter

, Ga

rage

Towe

r 2,

Le

vel

2 We

st end, Plaza

Tower

2, Level

2 Ce

nter

, Pl

aza

Tower

2, Level

2 Ce

nter

, Pl

aza

Towe

r 2. Le

vel

9 So

uth

end,

ro

of

Tower

2, Level

10

Center,

P.H.

Towe

r 2,

Level

10

Center,

P.H.

Towe

r 1, Le

vel

9 Ea

st en

d, ro

of

Tower

1, Level

10

Center,

P.H.

Towe

r 1,

Le

vel

10

SENSITIVITY

1.71

cm/g

1.77 cm/g

1.80 cm/g

1.81

cm/g

1.78

cm

/g

1.81

cm/g

1.78 cm

/g

1.82 cm/g

1.84 cm/g

1.78

cm/g

1.81 cm/g

1.80 cm/g

MAX. ACCELERATION

0.05

g

* *

Fail

ed

0.07

g

0.07

g

*

Fail

ed

Fail

ed *

0.05 g

*

Epic

entr

al di

stan

ce =

60 km

Cent

er,

P.H.

Film

speed

= 1 cm/sec

[See accelerogram on

next pa

ge]

Newport Be

ach,

84

0 Newport

Center Drive

CRA-1

#231

.*N

-'V

/^/%

-^>

A

/\A

/\/\/V

\/W

. \_

~W

X.

CD

GO

7 8 9 10 1 2

:>>

a)/

^

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

Stat

ion

No.

710

33.7

72 N,

11

8.31

9 W

Palo

s Ve

rdes

Re

serv

oir

Cres

tSMA

# 66

99

(MWD)

Eart

hqua

ke of

28 February 19

90

2343

G.

m.t.

Epic

entr

al di

stan

ce =

70 km

L 210

V Up

T 12

0

Sens

.Fr

eq.

Damp

.

Sens

.Fr

eq.

Damp

.

Sens

.Fr

eq.

Damp

.

= 1.

97=

25.9

= 0.

59

= 2.

07=

25.5

= 0.60

= 1.76

= 26.4

= 0.

60

cm/g

Hz crit

cm/g

Hz crit

cm/g

Hz crit

* * *

Film

sp

eed

= 1 cm

/sec

CO


DIRECTION

CONSTANTS

MAX.

ACCELERATION

CO

Oi

Station

No.

710

33.774 N,

118.321

W

Palo

s Verdes Reservoir

Abutment Building

SMA

# 1056

(MWD)

Earthquake of

28

February 1990

2343 G.

m.t.

Epicentral di

stan

ce =

70 km

L 21

0

V Up

T 120

Sens.

= 1.94 cm/g

Freq.

= 26.7 Hz

Damp.

= 0.6

crit

Sens.

= 1.

89 cm

/gFreq.

= 27

.2 Hz

Damp

. =

0.6

crit

Sens

. =

1.87

cm/g

Freq

. -

26.1 Hz

Damp.

- 0.6

crit

Film

speed

= 1 cm

/sec

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

CO

O>

Stat

ion

No.

637

34.249 N,

118.478 W

Sepulveda

VA Hospital

Grou

ndSMA

# 751

(VA)

Earthquake of

28 February 1990

2343 G.m.t.

Epicentral di

stan

ce =

72 km

L 360

V Up

T 270

Sens.

= 1.

84 cm

/gFreq.

- 26.3 Hz

Damp.

= 0.55

cr

it

Sens

. =

1.81

cm/g

Freq.

= 25

.6 Hz

Damp

. =0.55 cr

it

Sens.

= 1.80 cm

/gFreq.

= 25

.0 Hz

Damp

. =0.55 cr

it

Film

speed

= 1 cm

/sec

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

CO

J

Station

No.

655

34.3

12 N,

118.496 W

Jens

en Fi

lter

Pl

ant

Admi

nist

rati

on Bldg., ba

seme

nt

SMA

# 259

(MWD

)

Eart

hqua

ke of

28 February 19

90

2343

G.

m.t.

Epic

entr

al di

stan

ce =

75 km

L 022

V Up

T 292

Sens.

Freq

.Da

mp.

Sens

.Fr

eq.

Damp

.

Sens.

Freq

.Da

mp.

=1.78 cm/g

= 26

.3 Hz

= 0.57 cr

it

= 1.

74 cm/g

= 27.0 Hz

= 0.

55 cr

it

=1.63 cm/g

- 27.7 Hz

= 0.

50 crit

0.03

g

0.01 g

0.04 g

Film sp

eed

= 1 cm

/sec

U.S.


DIRECTION

CONSTANTS

MAX.

ACCELERATION

<0

00

Stat

ion

No.

655

34.313 N,

118.498 W

Jensen Filter Pl

ant

Generator bu

ildi

ng,

grou

nd

SMA

# 6757

(MWD)

Earthquake of

28 February 1990

2343

G.m.t.


75 km

L 02

2

V Up

T 29

2

Sens.

= 1.96 cm/g

Freq.

- 25.6 Hz

Damp.

= 0.63 crit

Sens. =1.99 cm/g

Freq.

- 25.5

Hz

Damp. =0.55 crit

Sens.

- 1.90 cm

/gFreq.

- 25.7 Hz

Damp

. -

0.63 crit

Film sp

eed

= 1 cm

/sec

0.04 g

0.02

g

0.03

g


DIRECTION

CONSTANTS

MAX. ACCELERATION

CO

CO

Stat

ion

No.

655

34.309 N,

118.

499

W

Jensen Filter Pl

ant

Reservoir ro

of

SMA

# 67

56

(MWD)

Earthquake of

28 February 1990

2343 G.

m.t.

Epicentral di

stan

ce =

75 km

L 02

2

V Up

T 29

2

Sens.

= 1.77 cm/g

Freq.

= 26

.6 Hz

Damp. =0.60 crit

Sens.

= 1.97 cm

/gFreq.

= 25.3 Hz

Damp

. =

0.63

crit

Sens.

= 1.

82 cm/g

Freq.

= 26.5 Hz

Damp. =0.63 crit

Film sp

eed

= 1 cm/sec

0.03 g

0.02

g

0.05

g

U.S.

ST

RONG

-MOT

ION

NETW

ORK

DIRE

CTIO

NCONSTANTS

MAX. AC

CELE

RATI

ON

O O

Stat

ion

No.

5029

34

.62

N,

118.29

W

Leon

a Valley Fi

re Station

Grou

nd

SMA-

1 #

1499

(U

SGS)

Eart

hqua

ke of

28

Fe

brua

ry 1990

2343

G.

m.t.

(W

WVB

trig

ger

time

)

Epic

entr

al di

stan

ce =

76 km

L 120

V Up

T 030

Sens

. =1.88 cm

/gFr

eq.

= 25

.8 Hz

Damp

. =

0.6

crit

Sens

. =

1.87

cm/g

Freq

. =

26.1 Hz

Damp

. =

0.6

crit

Sens. =1.83 cm/g

Freq

. =

26.4 Hz

Damp

. =

0.6

crit

Film

sp

eed

- 1 cm

/sec

Documents

GEOLOGICAL SURVEY OPEN-FILE REPORT 90-311 · motion stations in the southern California region that triggered during the ML=5.5 Upland earthquake of February 28, 1990. Additional