[IGSMAIL-5163]: Coseismic jump detected at Iquique due to the Mw 7.7 Tarapaca EQ
Michael Bevis
mbevis at osu.edu
Thu Jun 16 13:34:02 PDT 2005
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IGS Electronic Mail 16 Jun 13:33:13 PDT 2005 Message Number 5163
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Author: Bevis
Dear Colleagues
The CGPS station IQQE in the coastal city of Iquique (N. Chile)
recorded a coseismic jump due to the 13 June Mw 7.7 mantle earthquake
beneath Tarapaca. This GPS station is located about 115 km WSW of the
epicenter, which is about one focal depth away.
Based on one day of data collected after the event, the coseismic
jump at IQQE has components
west 42 mm
up 40 mm
south 12 mm
This result indicates that the fault plane is the more steeply
dipping (NP2) of the nodal planes identified in the Harvard CMT
announcement (copied below).
The GPS station lost some data due to electrical problems
precipitated by the event, and data communications remain fragile,
but the data is being deposited in the SOPAC archive as it becomes
available.
Eric Kendrick and Michael Bevis
Ohio State University
Hector Parra
Instituto Geografico Militar
*** REVISED HARVARD CMT ***
June 13, 2005, TARAPACA, CHILE, MW=7.7 event
CENTROID, MOMENT TENSOR SOLUTION
HARVARD EVENT-FILE NAME M061305B
DATA USED: GSN
MANTLE WAVES: 73S,189C, T=150
CENTROID LOCATION:
ORIGIN TIME 22:44:40.5 0.1
LAT 20.02S 0.01;LON 69.17W 0.01
DEP 95.3 0.5;HALF-DURATION 18.2
MOMENT TENSOR; SCALE 10**27 D-CM
MRR=-3.61 0.03; MTT=-0.26 0.02
MPP= 3.86 0.02; MRT= 0.61 0.02
MRP=-3.47 0.03; MTP=-0.25 0.01
PRINCIPAL AXES:
1.(T) VAL= 5.26;PLG=22;AZM= 85
2.(N) -0.25; 4; 353
3.(P) -5.02; 68; 254
BEST DOUBLE COUPLE:M0=5.1*10**27
NP1:STRIKE=182;DIP=24;SLIP= -81
NP2:STRIKE=352;DIP=67;SLIP= -94
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