department of the interior u.s. geological survey
TRANSCRIPT
DEPARTMENT OF THE INTERIOR
U.S. GEOLOGICAL SURVEY
PROCESSED CHILE EARTHQUAKE RECORDS OF 3 MARCH 1985 AND AFTERSHOCKS
Compiledby
N. Celebi 1
USGS Open-File Report 87-195 (Revised October 1988)
This report is preliminary and has not been reviewed for conformity with Geological Survey editorial standards.
Geological Survey, Menlo Park, California
PROCESSED CHILE EARTHQUAKE RECORDS OF 3 MARCH 1985 AND AFTERSHOCKS
USGS Open-File Report 87-195
From Chile
Rodolfo Saragoni
Marcello Fresard
Participants
Department of Civil Engineering, University of Chile, Santiago Department of Civil Engineering, University of Chile, Santiago
From USA
Gerald Brady
Mehmet Celebi*
Peter Mork
U.S. Geological Survey, Menlo Park, California U.S. Geological Survey, Menlo Park, California U.S. Geological Survey, Menlo Park, California
Consultants
From Chile
Edgar V. Kausel
From USA
S.T. Algermissen
Department of Geophysics, University of Chile, Santiago
U.S. Geological Survey, Golden, Colorado
*Principal Investigator
This report is preliminary and has not been reviewed for conformity with Geological Survey editorial standards.
ii
OUTLINE
I. INTRODUCTION................................................... 1
II. DESCRIPTION OF RAW DATA, LOCATION OF INSTRUMENTS,DESCRIPTION OF INSTRUMENTS.....................................3
III. RECORD PROCESSING IN THE UNITED STATES.........................6
IV. THE ORGANIZATION OF DATA PROCESSEDIN THE UNITED STATES...........................................7
REFERENCES...........................................................8
PROCESSED DATA PLOTS
UNCORRECTED ACCELEROGRAMS............................U-l to U-ll
CORRECTED A, V, AND D PLOTS..........................C-l to C-33
VELOCITY RESPONSE SPECTRA............................V-l to V-33
TRIPARTITE RESPONSE SPECTRA..........................T-l to T-33
FOURIER SPECTRA......................................F-l to F-66
APPENDICES
A. DATA PROCESSED IN CHILE....................................A
PLOTS............................................A-l to A-65
iii
LL INTRODUCTION
At 22:47:06.9 (GMT) on 3 March 1985, an Ms = 7.8 earthquake occurred off shore near Valparaiso in Central Chile. This earthquake had a foreshock at 22:46:56.4. The hypocenter parameters of the main shock as well as the foreshock are summarized by Algermissen (1985) and repeated in Table 1.
The earthquake was recorded by 31 accelerographs belonging to the Central Chile Accelerograph Network operated by the Geophysics Department and the Civil Engineering Department of the University of Chile (Saragoni and others, 1985). In addition to the recordings of the main shock, several important aftershocks were also recorded.
The 3 March 1985 Central Chile Earthquake is one of the major subduction zone earthquakes of this century. The records of strong-motions obtained in various locations throughout Chile with different site conditions will provide a basis for an in-depth study of this earthquake. The performance of structures in Chile are currently under investigation by several re searchers both from Chile and the USA: therefore, the strong-motion re cords will be of use to them and others.
The purpose of this report is to summarize the various records obtained in Central Chile during the main events of 3 March 1985 as well as the after shocks and also to present the pertinent digitized data as part of an agreement between the Chilean and USGS scientists. The project was sup ported by the NSF-USGS Panel convened to review proposals for investigat ing the earthquake.
This report is not intended to be a complete presentation of all the re cords and related information about the 3 March 1985 earthquake and after shocks. To the extent records and related information were made avail able, the processing was completed and this report was compiled. It should be mentioned that there are additional sets of data that are being digitized elsewhere.
Additional copies of this report may be obtained from the Open-File Ser vices Section, Branch of Distribution, USGS, Box 25425, Federal Center, Denver, Colorado 880225. Digital data corresponding to the plots of the analysis sections 1, 2 and 3 (uncorrected data, corrected data, and re sponse spectra, respectively) may be obtained on magnetic tape from the National Geophysical Data Center, NOAA, Code E/GC4, 325 Broadway, Boulder, Colorado 80303.
-I-
TABLE l.--Hypocenter parameters of the prim'cpalshocks from March 3, 1985(from Algermissen, 1985)
Origin time Latitude Longitude Depth Source
22:46:56.4 33.118°S. 71.822°W. 33* 5.2
22:47:06.9 33.155°S. 71.980°W. 33* 6.9
22:46:56.9 33.24° S. 71.86° W. 16
NEIS (PDE No. 9-85, March 21, 1985).
7.8 Do.
University of Chile, Department of Geophysics
(E. Kausel, oral commn., 1985) (only initial shock located).
Normal default depth set by NEIS.
-2-
II. DESCRIPTION OF RAW DATA, LOCATION OF INSTRUMENTS, DESCRIPTION OF INSTRUMENTS
All of the strong-motion data acquired in Central Chile during the main shock of 3 March 1985 and the following aftershocks were recorded on film. Although other types of instruments (accelerographs) were also used, all the records that are referred to in this report are from Kine- metrics SMA-1* type accelerographs.
At the time the funds for this project were allocated, the Chilean coun terparts of this project had already digitized four of the main shock records obtained from Llolleo, Vina del Mar, Valparaiso (UFSM), and Valpa raiso (Almendral). The originals or contact copies of these four records were not available for redigitizing in the U.S. for the purpose of compar ing the results of different techniques.
The location of strong motion substations of the Chile network are summar ized both in Figure .1 and Table 2 both of which are adopted from Saragoni and others (1985). Figure 1 also provides the orientations and peak ac celerations (of the 1985 event) and Table 2 provides the coordinates as well as the peak accelerations. For the sake of completeness, the descriptions, locations, and site conditions of all instruments of sta tions in Chile are summarized in Table 3.
The four main shock records digitized in Chile and their corresponding spectra are provided in Appendix A.
Commercial name only and does not constitute endorsement of the product.
-3-
SCALE
1 g=4 0 mm ACCELERATION! OF GRAVITY
CITY :
UNIVERSIOAO OE CHILE
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EPICENTER
i»» » »
EPICENTER MIO«A*LC OIHGEM oeEMISION MAXIMA OC EMEOOi* OC ACUCHOO * ACE LE»00»AMAt /
32*
NAVOWO
Motc&M omceiOM r VM.OHOC LAS ACCLCIIACIOHCS MAXIMAS MO<tT*AOAS MM LA M> NACIONAI. OC ACCLCNOOIU^Ot *AftA CLTCIMCMOTO OCL 1 OC MARZD OC1»M CM OltTMTAS OUOAOfS OC LAION* AFCCTAOAVALO«a OE LA* ACf LtHACKJNtJMCDtOM CM ACCLERACIOM OCOUMCOAO
3S«
MOTA 1
SC IMCLUTCN OATOC OC LAt ESTACtOHCi ACELSHOWIAflCAS OC LA COMISION CWLENA OC ENCRSIA MUCLCA* , CNOCtA . COOtLOO y OIVIS1OH ANOINA
MOTA 2
LOS VALOMt OC ACCLCHACON MAXIMA OCL SUGLO MO OOKMVONOCM AL VIALO* OC LOS COCriCIENTCS SISMIOOS USAOOS *O* LA "OHMA CHU.CN NOl «13 Of 72 OISCNO AMTISISMWO OC CDIFICIOS
Figure 1. Strong-motion stations of the Chilean strong-motion network (from Saragoni and others, 1985).
-4-
Tab
le 2
Reg
iste
red*
Max
imum
Acc
eler
atio
ns o
f th
e 3
Mar
ch 1
985
Cen
tral
Chi
le E
arth
quak
e
(Ado
pted
fro
m S
arag
oni
and
othe
rs,
1985
)
i en
i
No.
S
tati
on
1 lU
apel
(D
.I.C
.)
2 Lo
s V
ilos
(D.G
.G.)
3 La
Lig
ua
(D.I.
C.)
4 Pa
pudo
(D
.I.C
.)
5 Za
paUa
r (D
.G.G
.)
6 V
enta
nas
(CII
1LEC
TRA
)
7 Sa
n Fe
lipe
(D.I.
C.)
8 U
ay-U
ay
(D.I.
C.)
9 Sa
ladU
lo
(AN
DIN
A)
10
SanP
edro
(E
ND
ESA
)
11
Vita
del
Mar
(D
.I.C
.)
12
Val
para
iso
(El A
lmen
dral
) (D
.I.C
.)13
V
alpa
rais
o (U
.F.S
.M.)
(D.I.
C.)
14
Peld
ehue
(D
.I.C
.)
15
Qui
nuy
(EN
DES
A)
Coo
rdin
ates
3103
8'
710J
O'
3105
5*
7103
0'
3203
0'
710Q
6'
3203
1'
7102
7'
3203
4'
7102
8'
330Q
2'
7103
7*
3204
5*
7004
4*
3205
0'
7005
8*
3205
5*
7002
8'
3403
6'
710Q
O'
330Q
2'
7103
5'
3300
1*
7103
8'
3300
1*
7103
8*
330Q
8'
7004
1'
3301
6'
7101
9'
Com
pone
nt
N20
WS7
0W
Ver
tical
NS
EW
Ver
tical
N70
WS2
0W
Ver
tical
N50
ES4
0E
Ver
tical
NS
EW
Ver
tical
NS
EW
Ver
tical
SID
EN
80E
Ver
tical
N80
WS1
0W
Ver
tical
NS
EW
Ver
tical
NS
EW
Ver
tical
N70
WS2
0W
Ver
tical
NSO
ES4
0E
Ver
tical
S20E
N70
E V
ertic
alEW N
S V
ertic
alN
SEW
Ve
rtic
al
Max
imum
A
ccel
erat
ion'
0,12
00,
100
0,05
60,
254
0,03
60,
021
0,19
30.
126
0,12
8 (0
,469
)"
0.11
0 0,
317
0.33
2 0,
228
0.18
0 0.
180
0.14
0 0.
348
0,43
0 0,
208
0^35
0.
486
0.10
6 0.
085
0,05
2 0.
600
0.57
0 0.
375
0.22
8 (+
) 0.
356
(+)
0.17
1 (+
) 0,
293
(+)
0,16
3 (+
)
0,16
4 (+
) 0.
179
(+)
0.12
5 (+
) (0
.640
X*"
)1
0.20
30,
182
0,13
1
No.
S
tati
on
*Rea
d di
rect
ly f
rom
acc
eler
ogra
m.
** V
alue
wit
h in
stru
men
tal
corr
ectio
n.*+
'Val
ue o
btai
ned
from
dig
itize
d an
d co
rrec
ted
acce
lero
gram
s.
Acc
eler
ogra
phs
oper
ated
and
mai
ntai
ned
by(D
IG)
Dep
arte
rneu
to d
e In
geni
eria
Civ
il, U
nive
rsity
of
Chi
le
(DG
G)
Dep
arta
men
to d
e G
eolo
gia
y G
eofi
sica
, U
nive
rsity
of
Chi
le
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Sant
iago
(E
ND
ESA
)
Uoi
leo
(DJ.
C.)
Mel
ipU
la
(D.G
.G.)
Rape
! (E
ND
ESA
)
Pich
ilem
u (D
.G.G
.)
San
Fern
ando
(D
.G.G
.)
Iloca
(D
.G.G
.)
Hua
lane
(D
.G.G
.)
Con
stitu
cion
(D
.G.G
.)
Talc
a (D
J.C
.)
Col
biin
(E
ND
ESA
)
El C
olor
ado
(EN
DES
A)
Pehu
ench
e (E
ND
ESA
)
Cau
quen
es
(DG
G.)
Chili
an V
iejo
(D
J.C
.)
Chili
an N
uevu
(D
J.C
.)
Coo
rdin
ates
3302
7'
7004
0'
33°4
1'
7103
6-
3304
1'
7101
3'
340Q
1'
7104
0'
3402
3-
7200
1'
3403
6'
7JO
OO
'
3405
5'
7201
3-
3405
8'
7104
9'
3501
8'
7201
9'
3502
6'
7004
0'
3504
3-
7102
6'
3504
3-
7102
6'
3504
4'
7101
4'
3600
0'
7201
3'
3603
6'
7200
6'
3604
0*
7200
9'
Com
pone
nt
NS
EW Ver
tical
S8
0E
N10
E V
ertic
al
EW
NS
Ver
tical
N
S EW Ver
tical
N
S EW Ver
tical
N
S EW Ver
tical
N
S EW Ver
tical
N
S EW Ver
tical
N
S EW Ver
tical
N
80W
N
10E
Ver
tical
N
S EW Ver
tical
N
S EW Ver
tical
N
S EW Ver
tical
N
S EW Ver
tical
NSO
EN
10W
Ver
tical
N20
WN
70E
Ver
tical
Max
imum
A
ccel
erat
ion
(G)
0.11
40,
114
0.07
30,
426(
+)
0.66
9 (+
)0,
852
(+)
0.59
90,
671
0.59
30,
310
0,14
40,
110
0,26
60.
180
0.13
2"0.
227
0,34
30,
121
0,21
60,
282
0,08
70,
169
0,14
3 0.
100
0,14
4 0,
077
0,03
9 0,
161
0,16
8 0.
077
0,03
7 0.
034
0.02
2 0.
120
0,11
3 0,
060
0,03
1 0,
023
0,02
0 0,
086
0,11
7 0,
046
0,05
7 0.
065
0,04
1 0,
108
0,06
7 0.
026
III. RECORD PROCESSING IN THE UNITED STATES
A. General Remarks
Limited number of records for digitizing at USGS, Menlo Park, were provided by Chilean counterparts. The records provided were contact prints on mylar made from contact negatives of the original records. In both stages of printing, sections of the record of approximately 2 ft (60 cm) length with overlaps were printed separately, and carefully cut and taped in Chile for the final digitizing copy. The digitizing in the U.S. provided by the commercial digitizer, with a least count of 1 micron (10~° m), and an RMS error of 10 microns when working with these records, detected slight changes in trace location and trace clarity at these joins. In some cases, where a join had been made in either the first-generation negative or the second-generation print well after the strong motion portion of the record had finished, digi tizing was not continued past the join.
The effect of these joins is difficult to assess. Although it was clear, by eye, that the joins were made carefully, physical movement at the taped joins could be particularly seen in the digitized, en larged versions of the reference traces. At first it was thought that the effects on the final corrections would not be significant. This, of course, remains true for the visible high-frequency content of the accelerations. But the long-period "noise" content, portrayed visibly only in the displacements, although also present in the accelerations and velocities, is an unknown factor. Any step function disturbance in a digitized record adds noise or errors at all frequencies, and the band-pass filtering, which is a significant portion of the processing here, cannot correct for this exactly. Proper use of the AGRAM pro gram package in the next section, requires that vertical butting lines be placed on contact prints of the original (or the original itself) before printing in sections or cutting. A section of record to be digitized must have a butting line, duplicated on adjacent sections, at its beginning and end, rather than a cut or splice.
Two of the second generation prints were digitized past their joins because these joins occurred during significant accelerations on the record. These are the La Ligua and San Felipe records from the main shock of March 3, 1985. The La Ligua join was 36 seconds into the record. The San Felipe join was 34 seconds into the record. Care should be taken if data beyond these points is included in any analy sis using these records.
B. Steps in Processing
The records are processed according to the descriptions in AGRAM (Converse, 1984). Briefly, the steps are as follows:
1. Digitizing of the film records at a commercial digitizing firm (IOM TOWILL in Santa Clara, California; now LS Associates) on a trace- following, computer-controlled laser scanner. Unequal time spacing, at an average of 600 samples per second, is used. The records are divided with vertical butting lines into 10-second (10 cm) frames to fit the digitizer.
-6-
2. Butting the separately digitized, 10-second frames together, using the specially inserted vertical lines; each vertical line is digitized twice, once in each adjacent frame.
3. Preparation of uncorrected data by subtracting out the reference traces, subtracting the average value, and using the time marks for adjusting the X-coordinates. Plots of the uncorrected data are pre pared.
4. The data are then passed through a high-frequency correction algorithm that applies a high-frequency filter (50 Hz), instrument corrections, and decimation to 200 samples per second. A low-frequency high-pass Butterworth filter removes all periods longer than a predetermined period obtained from the data. This period is chosen after considera tion of: (a) the strong-motion duration of the earthquake, indicated by the records, (b) the behavior of the displacements, calculated from the accelerations at specific sites, and (c) the total length of the digitized records.
Taking the comments in the previous section into consideration, pre liminary correction processing and integration for displacements in dicate that there are significant ground motions at periods of three to four seconds, and a five-second filter shows no unrealistic content between four- and five-second periods. A long period limit of five- seconds is chosen for this data. Plots of the corrected acceleration, velocity, and displacements for the three components of each recording are prepared.
5. Response spectra are calculated for periods up to the long-period limit. Linear plots of relative velocity response spectra, and the log-log tripartite plots of pseudo-velocity response are prepared.
6. Fourier amplitude spectra, calculated by FFT, are presented on linear axes.
IV. ORGANIZATION OF THE DATA PROCESSED IN THE UNITED STATES
Data processed in the U.S. fall into three categories:
a.) Main shock data of 3 March 1985 (7 stations),b.) One hour aftershock of 3 March 1985 (2 stations),c.) One important aftershock (1 station).
A general matrix of the processed data is provided in Table 4. The plots in accordance with the matrix follow.
-7-
REFERENCES
Algermissen, S.T., 1985, Preliminary report of investigations of the Central Chile earthquake of March 3, 1985: U.S. Geological Survey Open-File Report 85-542.
Converse, A.M., 1984, AGRAM: A series of computer programs for processing digitized strong-motion accelerograms: U.S. Geological Survey Open-File Report 84-525.
Saragoni, R., Gonzales, P., and Fresard, M., 1985, Analysis de Los Acelero- grams del Terremoto del 3 De Marzo de 1985: Publicacion SES I 4/1985 (199), December 1985.
TABL
E 3
VD
I
STRONG N
OTIO
N AC
CELE
ROGR
APH
STAT
ION
LIST
(1
985)
Numb
er
Stru
ctur
e Na
me
of I
nstr.
Coor
dina
tes
Site G
eology
Type
/Siz
e
San
Felipe
1
Quin
tero
2
(Central
Vent
anas
II
)(N
atio
nal
Electric D
istr
ibution C
o.)
LI ay
LI a
y 1
Vina d
el Ma
r 1
Valp
arai
so
2
Peldehue
1
Vall
enar
1
32 70 32 71 32 70 33 71 33 71 33 70 28 70
.75
.73
.75
.49
.83
.98
.03
.58
.08
.63
.13
.68
.58
.77
S U S U S U S U S U S U S
Alluvium
Loos
e Sand
(Pliocene)
Soft a
lluvium
(Tertiary,
Quat
erna
ry)
Allu
vium
&Sand
a) Vo
lcan
ic r
ock
(Precambrian/
Paleozoic)
b) Fi
ll
Volc
anic
Roc
kand
Alluvium
(Tertiary/
Quat
erna
ry)
Firm
Gravel
(Tertiary/
Quat
erna
ry)
1 st
ory
building
a) Thermoelectric
Plant, 6
story
Boil
er B
uild
ing
(60 meters h
igh)
b)
"
1 story
buil
ding
10 s
tory b
uild
ing
a) Univ.
of S
anta
Maria
Camp
us1
stor
y bu
ildi
ngb)
Av
e du
Arg
enti
na
1 story
buil
ding
1 story
building
Instrument
Location
Mode
l
Ground l
evel
SNA-
1
Grou
nd L
evel
SNA-1
Top of
the
SNA-1
structure
Grou
nd L
evel
SN
A-1
Base
ment
SN
A-1
Ground L
evel
SN
A-1
Basement
SNA-1
Grou
nd L
evel
DG
-2
Grou
nd L
evel
DG-1
Oper
ated
/ Ma
inta
ined
Civi
l(U
niv
Eng.
. of
Geop
hysi
cs(U
niv
M
Civi
l(U
niv
M M " M
. of M Eng.
. of M M M
M
Geop
hysi
cs(U
niv
. Of
by Oept
.Chile)
Dept
.Ch
ile)
M
Oept
.Ch
ile)
M M M M
Oept.
Chile)
TABL
E 3
(CO
NTI
NU
ED)
o i
Name
La S
eren
a
11 lap
el
Los
Vilo
s
La L
igua
Papu
da
Zapallar
Santiago
Llol
leo
Nunber
of I
nstr
. Coordinates
1 29
.90
S 71
.29
W
1 31
.63
S 71
.17
W
1 31
.92
S 71
.50 W
1 32
.50
S 71.10 W
1 32
.51
S 71.45 W
1 32
.57
S 71
.47 U
2 1)
33
.45
S 70
.67
W
2) National
Elec
tric
Co.
Bldg
.
1 32
.68
S 71.60 W
Stru
ctur
e In
stru
ment
Si
te G
eology
Type
/Siz
e Lo
cati
on
Soft
All
uviu
m 2
stor
y bu
ildi
ng
Grou
nd L
evel
(T
erti
ary/
Quaternary)
Soft
Alluvium
1 st
ory
buil
ding
Basement
(Ter
tiar
y/
Quaternary)
Sedi
ment
ary
Rock
1
stor
y bu
ildi
ng
Ground L
evel
(Mid
dle
to U
pper
Triassic)
Allu
vium
"
" "
(Ter
tiar
y/
" "
Quaternary)
Granite
" "
" (Jurassic)
MM
Firm
Gravel
3 st
ory
buil
ding
Basement
(Ter
tiar
y/
Quat
erna
ry)
Sand
ston
e &
3 story
buil
ding
Basement
volc
anic
roc
k (P
aleo
zoic
)
Mode
l
DG-2
SNA-
1
SNA-1
SNA-1
(2g
capa
ci
ty)
SHA-1
(2g
capa
ci
ty)
SHA-1
1) a) US
GS
C-12
b)
SHA-1
2) Ja
pane
se
Instr.
SHA-1
Operated/
Naintained b
y
Civi
l En
g. Oept.
(Uni
v. of C
hile)
Civi
l En
g. Oept.
(Univ. of C
hile)
Geop
hysi
cs O
ept.
(yni
v. of
Chile)
Civi
l En
g. Oe
pt.
(Uni
v. of
Chi
le)
Geophysics Oept.
(Uni
v. of C
hile)
Civi
l Eng. Dept.
(Univ. of C
hile)
TABLE
3 (C
ONTI
NUED
)
Num
ber
Nam
e of
Instr
.
Hell p
ill a
1
Rap
el
1 (E
lectr
ic
Co.
)
Ran
cagu
a (C
OYA
) 1
El
Ten
ient
e 1
(Cop
per
Com
pany
)
San
Fern
ando
1
Plc
hlle
nu
1 72
.02
W
San
ta C
ruz
1
11 o
ca
1
Coo
rdin
ates
33.6
8 S
71.2
2 W
34.0
3 S
71.5
8 W
34.2
0 S
70.5
3 W
34.2
1 S
70.5
4 W
34.6
0 S
71.0
0 W
Str
uct
ure
In
stru
me
nt
Site
G
eolo
gy
Typ
e/S
ize
Loca
tion
Mod
el
Allu
viu
m
1 sto
ry b
uild
ing
Gro
und
Leve
l SN
A-1
Mar
ine
& C
on
tin-
Tunn
el
" "
RFT
-250
e
nta
l S
edim
ents
(P
ale
ozo
ic)
Soft
Allu
viu
m
Tunn
el
" "
RFT
-250
(T
ert
iary
/ Q
uate
rnar
y)
Rio
litic
1 st
ory
bu
ildin
g
" "
RFT
-250
V
olc
anic
ro
ck
An
de
sitic
(U
pper
C
reta
ceou
s)
Allu
vium
1
story
build
ing
" "
SNA-
1 (T
ert
iary
/ Q
uate
rnar
y)
34.3
8 S
Sla
tes,
sa
nd-
1 st
ory
bu
ildin
g
" "
SNA-
1 st
on
e,
lime
sto
ne
(P
reca
nb
ria
n/
Pa
leo
zoic
)
34.6
5 S
71.6
8 W
34.9
2 S
72.2
2 W
Allu
viu
m
1 sto
ry b
uild
ing
"
" SN
A-1
(Te
rtia
ry/
Qua
tern
ary)
San
dsto
ne,
1 st
ory
bu
ildin
g
" "
SNA-
1 a
lluvi
um
(T
ert
iary
/ Q
uate
rnar
y)
Ope
rate
d/
Mai
ntai
ned
by
Geo
phys
ics
Dep
t. (U
niv
. o
f C
hile
)
(EN
DES
A)
Geo
phys
ics
Dep
t. (U
niv
. o
f C
hile
)
m
H
Geo
phys
ics
Dep
t. (U
niv
. o
f C
hile
)
Geo
phys
ics
Dep
t. (U
niv
. of
Chile
)
mm
m
it m
m
TABLE
3 (CONTINUED)
K)
I
Name
Hual
ane
Curico
Cons
t ituc t
on
Talca
Lina
res
Chil
ean
Nuev
o
Chil
ean
Vie jo
Concepclon
(Huachlpato)
Concepclon
Conc
epcl
on
Number
of In
str.
1 1 1 1 1 2 1 1 1 1
Coordinate
s
34.9
7 S
71.8
2 U
34.9
8 S
71.2
3 U
35.2
0 S
72.3
2 U
35.4
3 S
70.6
7 U
35.8
2 S
71.7
2 U
36.6
7 S
72.1
5 U
36.6
0 S
72.10
U
36.7
3 S
73.10 U
36.8 S
73.0 U
36.8
S
73.0
U
Site G
eology
Alluvium
(Tertiary/
Quat
erna
ry)
Alluvium
(Qua
tern
ary)
Granite
(rock)
Soft
all
uviu
m (Quaternary)
Alluvium
(Qua
tern
ary)
Alluvium
(Qua
tern
ary)
Soft a
lluv
ium
(Quaternary)
Sandstone
and
lutites
(Pal
eozo
ic)
Sands
Granitic r
ock
Stru
ctur
e In
stru
ment
Type/Size
Loca
tion
2 story
buil
ding
1 story
building
Ground L
evel
2 st
ory
building
Grou
nd L
evel
2 story
building
Ground
Lev
el
2 st
ory
buil
ding
Baseme
nt
1 st
ory
buil
ding
Gr
ound L
evel
1 st
ory
buil
ding
Baseme
nt
4 st
ory
buil
ding
Gr
ound
Level
Mode
l
SNA-1
DG-2
SNA-1
SNA-
1
SNA-
1
SNA-
1
SNA-1
SNA-
1 DG
-2*
SNA-
1 DG
-2*
SNA-
1 DG
-2*
Operated/
Main
tain
ed by
Geophysics D
ept.
(U
niv.
of
Chile)
Civil
Eng.
Dept.
(Univ. o
f Chile)
Geophysics D
ept.
(Uni
v. o
f Ch
ile)
Civi
l En
g. De
pt.
(Uni
v. o
f Chile)
TABLE
3 (CONTINUED)
Numb
er
Name
of I
nstr,
Temu
co
Vald
ivia
Osor
no
Puer
to
Montt
Aric
a
Iqui
que
Toco
pill
a
Cala
ma
Anto
faga
sta
Taltal
Cop i
a po
1 1 1 1 2 2 1 1 1 1 1
Coordinates
Site G
eolo
gy
38.7
3 S
72.61 W
39.7
9 S
73.2
7 W
40.0
7 S
73.1
4 U
41.4
8 S
72.9
3 U
18.5
0 S
70.2
0 U
20.2
0 S
70.1
0 U
22.1
0 S
70.2
2 U
22.4
6 S
68.9
2 U
23.7
1 S
70.4
2 U
25.2
4 S
70.3
0 U
27.3
6 S
70.3
5 U
Consol idated
allu
vium
(Eocene,
Miocene)
Allu
vium
and
sand (
Quat
erna
ry)
Allu
vium
and
sand (Q
uate
rnar
y)
Allu
vium
(Quaternary)
Volc
anic
roc
k (m
ioce
ne,
plio
cene
)
Allu
vium
(Jurassic)
Allu
vium
(Jurassic)
Sedi
ment
ary
rock
(m
ioce
ne,
plio
cene
)
Ande
s it i
c vo
lcan
ic
rock
(Jurassic)
Andesitic
volcanic
rock (Jurassic)
Allu
vium
(tertiary,
quat
erna
ry)
Stru
ctur
e Type/ Si
ze
1 st
ory
building
1 st
ory
buil
ding
1 st
ory
buil
ding
2 story
buil
ding
2 story
buil
ding
2 story
buil
ding
1 story
building
1 st
ory
buil
ding
1 story
buil
ding
2 story
building
Nine
tun
nel
Instrument
Loca
tion
Ground L
evel
Ground L
evel
Basement
Ground L
evel
Basement
Basement
Ground level
Ground level
Ground level
Basement
Grou
nd level
Mode
l
06-2
06-1
DG-2
D6-2
SMA-1
SNA-1
DG-2
DG-2
DG-1
DG-2
DG-1
Oper
ated
/ Ma
inta
ined
by
Civi
l Eng. Dept.
(Uni
v. o
f Ch
ile)
H
H
M
H
MM
MM
Civi
l Eng. Dept.
(Univ. o
f Chile)
M
M
M
MM
H
MM
M
MM
H
H
H
TABLE 4MATRIX OF
MAIN SHOCK OF 3 MARCH 1985
UncorrectedStation AcceVerbg'fams
pages CHILEAN INST. U-l
080 degrees UP
350 degrees
PAPUDO U-2 140 degrees
UP 50 degrees*
TALCA U-3 10 degrees UP
280 degrees
ILLAPEL U-4 70 degrees
UP 340 degrees
LA LIGUA U-5 290 degrees
UP (**) 200 degrees
LLAY LLAY U-6 280 degrees
UP 190 degrees
SAN FELIPE U-7 170 degrees
UP 80 degrees
* Note: Papudo (50 degrees) ** Note: La Ligua (vertical)
PLOTS OP DATA PROCESSED IN THE U.S.
CorrectedA, V, D
C-l C-2 C-3
C-4 C-5 C-6
C-7 C-8 C-9
C-10 C-ll C-12
C-13
C-14
C-15 C-16 C-17
C-18 C-19 C-20
Velocity Response Spectra""
V-l V-2 V-3
V-4 V-5 V-6
V-7 V-B V-9
V-10 V-ll V-12
V-13
V-14
V-15 V-16 V-17
V-18 V-19 V-20
Tripartite Response Spectra"
T-l T-l T-3
T-4 T-5 T-6
T-7 T-8 T-9
T-10 T-ll T-12
T-13
T-14
T-15 T-16 T-17
T-18 T-19 T-20
Fourier AmplitudeSpectrum ofAcceleration
F01-F02 F03-F04 F05-F06
F07-F08 F09-F10 F11-F12
F13-F14 F15-F16 F17-F18
F19-F20 F21-F22 F23-F24
F25-F26
F27-F28
F29-F30 F31-F32 F33-F34
F35-F36 F37-F38 F39-F40
not available, not available.
-14-
TABLE 4MATRIX OF PLOTS OP DATA PROCESSED IN THE U.S.
(continued)
ONE HOUR AFTERSHOCK OF 3 MARCH 1985
UnconnectedStation Accelerograms
pages LLOLLEO U-8
100 degreesUP
10 degrees
VINA DEL MAR U-9290 degrees
UP200 degrees
VALAPRAISO(UTFSM)* U-10160 degrees
UP070 degrees
ANOTHER AFTERSHOCK: April 8,
LLOLLEO U-ll100 degrees
UP010 degrees
CorrectedA, V, D
C-21C-22C-12
C-24C-25C-26
C-27C-28C-29
1985
C-30C-31C-32
VelocityResponseSpectra
V-21V-22V-23
V-24V-25V-26
V-27V-28V-29
V-30V-31V-32
TripartiteResponseSpectra
T-21T-22T-23
T-24T-25T-26
T-27T-28T-29
T-30T-31T-32
Fourier AmplitudeSpectrum ofAcceleration
F41-F42F43-F44F45-F46
F47-F48F49-F50F51-F52
F53-F54F55-F56F57-F58
F59-F60F61-F62F63-F64
* Denoted as UFSM (#3 in Table 2).
-15-
APPENDIX A
DATA PROCESSED IN CHILE
Part of the 3 March 1985 main shock accelerograms were processed in Chile by Saragoni and others (1985). In this appendix, the processed data is pre sented via the plots made by using the software of the IISGS.
matrix:The processed data in this appendix is provided as in the following
Table A-l Matrix of Plots
StationUncorrected
Ac ce le rograas
Relative Velocity Response Spectrum
Tripartite Response Spectrum
Fourier AmplitudeSpectrum of
Acceleration
Llolleo pages100 degrees A-l
UP to10 degrees A-6
A-22 A-23 A-2A
A-33 A-3 A A-35
A-AA-A5 A-A6-A7 A-A8-A9
Vina Del Mar290 degrees
UP200 degrees
A- 7to
A-12
A-25A-26A-27
A-36A-37A-38
A-50-51A-52-53A-5A-55
Valparaiso (UFSM)
160 degreesUP
70 degrees
A-13to
A-16
A- 28A-29A-30
A-39A-AOA-A1
A-56-57A-58-59A-60-61
Valparaiso (El Almandrel)
50 degrees A-17UP* to
140 degrees A-21
A-31
A-32
A-A2
A-A3
A-62-63
A-6A-65
Not available
-A-
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V-29
RELflTIVE VELOCITY RESPONSE SPECTRUM LLQLLEQ, EflRTHQURKE OF RPRIL 8, 1985, 100 DEC
0,2,5,10,20 PERCENT CRITICRL OflMPING FILTERS: BUTTERWORTH, ORDER 4, 0.200 HZ; RNTIRLIRS 50 - 100 HZ
80 NRTIGNRL MTER
0.0 0.5 1.0 1.5 2.0 2.5 3.03 7 1115 UNDRMPED NRTURRL PERIOD-SECONDS
V-30
C_J
CO
CJI
LU COZoQ_ CO LU DC
CJO
RELflTIVE VELOCITY RESPONSE SPECTRUM LLOLLEO, EflRTHQURKE GF RPRIL 8, 1985, UP
0.2,5,10.20 PERCENT CRITICRL DRMPING FILTERS: BUTTERWORTH, ORDER 4, 0.200 HI; RNTIflLIflS 50 - 100 HZ
140
120
100
80
60
20
0
NRTIONRL STRONG MOTION DRTR CERV
FflS
\
MTER
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3 7 11 15 UNDflMPED NflTURflL PERIOD-SECONDS
V-31
CJ LU CO
CJ I
LU CO -2L
O Q_ CO LU DC
CJ O
RELRTIVE VELOCITY RESPONSE SPECTRUM LLQLLEQ, ERRTHQURKE OF RPRIL 8, 1985, 010 DEC
0,2,5,10,20 PERCENT CRITICRL DRMPING FILTERS: BUTTERNGRTH, ORDER 4, 0.200 HZ; flNTIRLIRS 50 - 100 HZ120
100
80
60
20
0
NflTIGNflL STRONG MOTION DflTfl CE RV pns
- n
0.0 0.5 1.0 1.5 2.0 2.5 3.03 7 UNDflMPED NflTURflL PERIOD-SECONDS
11 15
v-32