Delivered-To: igsmail@igscb.jpl.nasa.gov Content-Transfer-Encoding: 7bit Message-Id: <941EDF86-CF28-4303-A86E-B8AF6707FC8C@osu.edu> Content-Type: text/plain; charset=ISO-8859-1; delsp=yes; format=flowed To: igsmail@igscb.jpl.nasa.gov From: Michael Bevis Subject: [IGSMAIL-5163]: Coseismic jump detected at Iquique due to the Mw 7.7 Tarapaca EQ Date: Thu, 16 Jun 2005 16:34:02 -0400 Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 16 Jun 13:33:13 PDT 2005 Message Number 5163 ****************************************************************************** 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 ###-####### ####-----########## ####---------########## ####------------########### ####-------------############ ####---------------############ ###----------------############ ####-----------------####### ## ####------- -------####### T ## ####------- P -------####### ## ####------- --------########### ###------------------########## ####-----------------########## ####---------------########## ####--------------######### ###-------------####### ###----------###### ##------###