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GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L16315, doi:10.1029/2006GL027079, 2006

Coseismic slip distribution of the 2003 Mw 6.6 San Simeon earthquake, California, determined from GPS measurements and seismic waveform data

F. Rolandone

Laboratoire de Tectonique, UMR 7072, Université Pierre et Marie Curie, Paris, France


D. Dreger

Berkeley Seismological Laboratory, University of California, Berkeley, California, USA


M. Murray

Berkeley Seismological Laboratory, University of California, Berkeley, California, USA


R. Bürgmann

Berkeley Seismological Laboratory, University of California, Berkeley, California, USA


Abstract

We combine geodetic and seismic data sets to constrain the coseismic slip distribution of the M w 6.6 San Simeon earthquake which occurred in the central California Coast Ranges on December 22, 2003. We use continuous and survey-mode GPS observations along with seismic waveform data from the California Integrated Seismic Network (CISN). We invert both data sets for the distribution of finite fault slip in a layered-Earth model. The inversion results indicate that the rupture extends to the southeast of the epicenter for approximately 25–30 km and occurred in a relatively shallow depth range between 1 to 10 km. The average and peak slip are 0.61 m and 2.37 m, respectively. The scalar seismic moment is 7.85e18 Nm, and the static stress drop 1.7 MPa. This thrust earthquake is characterized by its shallow, along-strike extended slip.

Received 5 June 2006; accepted 18 July 2006; published 30 August 2006.

Index Terms: 1242 Geodesy and Gravity: Seismic cycle related deformations (6924, 7209, 7223, 7230); 1240 Geodesy and Gravity: Satellite geodesy: results (6929, 7215, 7230, 7240); 7209 Seismology: Earthquake dynamics (1242); 7215 Seismology: Earthquake source observations (1240); 7230 Seismology: Seismicity and tectonics (1207, 1217, 1240, 1242).

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Citation: Rolandone, F., D. Dreger, M. Murray, and R. Bürgmann (2006), Coseismic slip distribution of the 2003 Mw 6.6 San Simeon earthquake, California, determined from GPS measurements and seismic waveform data, Geophys. Res. Lett., 33, L16315, doi:10.1029/2006GL027079.