[IGSMAIL-5021]: Parkfield CA earthquake preliminary offsets

[Paul Jamason <pjamason @ gpsmail.ucsd.edu>]

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IGS Electronic Mail      29 Sep 13:43:29 PDT 2004      Message Number 5021
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Author: Paul Jamason, Yehuda Bock, Peng Fang, Jeff Genrich
Subject: Parkfield CA earthquake preliminary offsets

Preliminary co-seismic offsets have been calculated for the 
09/28/2004 Parkfield CA earthquake, and are listed below.

Summary pages for the event are available from the new 
reason.scign.org website at:

http://reason.scign.org/scignDataPortal/parkfieldEq09282004.jsp

and from the SOPAC website at:

http://sopac.ucsd.edu/other/news/parkfieldEq09282004.html

These summary pages include links to Parkfield high-rate GPS site
data (1-second sampling rate) at SOPAC and NCEDC, epoch-by-epoch 
solutions, and additional resources.  A horizontal co-seismic 
displacement vector map will also be available shortly.

Questions regarding high-rate data processing may be directed to 
Jeff Genrich (jeff @ gpsmail.ucsd.edu).  Questions regarding web 
resources may be directed to Paul Jamason 
(pjamason @ gpsmail.ucsd.edu).

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Preliminary co-seismic offsets (after - before):

       NORTH   EAST       UP  (mm/mm/mm)
MASW   36.14   18.32    -3.28
MIDA  -33.36  -16.55   -10.61
POMM    4.94   33.10     4.89
RNCH   10.81   35.36     8.58
HUNT  -28.42  -31.61     8.01
LAND   27.80   30.85     0.97
CARH   -7.72  -10.28     2.20
PKDB    9.58   36.60    12.04
USLO    0.00   -0.25    -0.04
CAND  -37.38  -16.79    -2.18
MNMC  -29.96   -4.26    -8.86
TBLP  -20.39  -23.57     1.52
HOGS   33.67   18.82     2.73
CRBT    0.31    6.28     7.10
LOWS    3.09   10.54     5.48

Notes:
Pre-quake solution data: 00:00 - 17:00 GMT
Post-quake solution data: 18:00 - 24:00 GMT

The north/east/up constraints for USLO are 1/1/4 mm, while all 
others are 5/5/10 cm.  GPS orbits are tightly constrained to IGS 
ultra rapid.
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Thank you,
Paul

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Paul Jamason
Programmer/Analyst
Scripps Orbit and Permanent Array Center  (http://sopac.ucsd.edu)
California Spatial Reference Center        (http://csrc.ucsd.edu)

Institute of Geophysics and Planetary Physics
Scripps Institution of Oceanography
University of California, San Diego            work: 858-822-4472
9500 Gilman Dr.                                cell: 858-663-3508
La Jolla, CA 92093-0225                         fax: 858-534-9873
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