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Slip history of the 2003 San Simeon earthquake constrained by combining 1-Hz GPS, strong motion, and teleseismic data

Ji, Chen and Larson, Kristine M. and Tan, Ying and Hudnut, Kenneth W. and Choi, Kyuhong (2004) Slip history of the 2003 San Simeon earthquake constrained by combining 1-Hz GPS, strong motion, and teleseismic data. Geophysical Research Letters, 31 (17). Art. No. L17608 . ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20101122-154926765

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Abstract

The slip history of the 2003 San Simeon earthquake is constrained by combining strong motion and teleseismic data, along with GPS static offsets and 1-Hz GPS observations. Comparisons of a 1-Hz GPS time series and a co-located strong motion data are in very good agreement, demonstrating a new application of GPS. The inversion results for this event indicate that the rupture initiated at a depth of 8.5 km and propagated southeastwards with a speed ~3.0 km/sec, with rake vectors forming a fan structure around the hypocenter. We obtained a peak slip of 2.8 m and total seismic moment of 6.2 × 10^(18) Nm. We interpret the slip distribution as indicating that the hanging wall rotates relative to the footwall around the hypocenter, in a sense that appears consistent with the shape of the mapped fault trace.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2004GL020448 DOIUNSPECIFIED
http://www.agu.org/pubs/crossref/2004/2004GL020448.shtmlPublisherUNSPECIFIED
Additional Information:© 2004 American Geophysical Union. Received 6 May 2004; revised 4 June 2004; accepted 20 August 2004; published 15 September 2004. We thank Lupei Zhu for deconvolution scripts and Jeanne Hardebeck for fault plane information. Discussions with Egill Hauksson were very constructive. Reviews by Don Helmberger, John Langbein, Nancy King, and an anonymous reviewer improved the manuscript. Seismic data were provided by CISN and IRIS DMC. We acknowledge SCIGN and its funders (W. M. Keck Foundation, NASA, NSF, USGS, SCEC) as the source of the GPS data. We especially thank Yehuda Bock and John Langbein for their efforts in updating the Parkfield GPS Array to record at 1-Hz. UCSD, SCIGN, USGS, and UCB all contributed to the development of the array. Assistance with GPS data, archiving, and analysis software was provided by SOPAC, UNAVCO, and JPL-Caltech. This paper is supported by USGS grant #04HQGR0048, NSF grant #EAR-0337206, and the Gordon and Betty Moore Foundation. This is Caltech Seismological Laboratory contribution 9077 and Caltech Tectonic Observatory contribution #6.
Group:Caltech Tectonics Observatory
Funders:
Funding AgencyGrant Number
USGSUNSPECIFIED
NSFEAR-0337206
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:Geodesy and Gravity: Seismic deformations ; Seismology: Earthquake ground motions and engineering ; Tectonophysics: Dynamics, seismotectonics
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Other Numbering System NameOther Numbering System ID
Caltech Tectonics Observatory6
Caltech Seismological Laboratory 9077
Record Number:CaltechAUTHORS:20101122-154926765
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20101122-154926765
Official Citation:Ji, C., K. M. Larson, Y. Tan, K. W. Hudnut, and K. Choi (2004), Slip history of the 2003 San Simeon earthquake constrained by combining 1-Hz GPS, strong motion, and teleseismic data, Geophys. Res. Lett., 31, L17608, doi:10.1029/2004GL020448
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20960
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Nov 2010 17:28
Last Modified:26 Dec 2012 12:40

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