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GEOPHYSICAL RESEARCH LETTERS,
VOL. 28, NO. 2,
PAGES 359–362,
2001
Inversion of GPS Data for Spatially Variable Slip-Rate on the San Andreas Fault near Parkfield, CA
J. R. Murray
Department of Geophysics, Stanford University, Stanford, CA
P. Segall
Department of Geophysics, Stanford University, Stanford, CA
P. Cervelli
Department of Geophysics, Stanford University, Stanford, CA
W. Prescott
United States Geological Survey, Menlo Park, CA
J. Svarc
United States Geological Survey, Menlo Park, CA
Abstract
We analyze GPS data collected from 1991-1998 at 35 sites near the Parkfield segment of the San Andreas Fault. Inverting the
resultant site velocities for the distribution of interseismic slip-rate on the San Andreas reveals an area of low slip-rate
on the fault extending from between Middle Mountain and Carr Hill to southeast of Gold Hill. This slip-rate pattern is similar
to that found by Harris and Segall [1987] using trilateration data collected between 1966 and 1984. We infer a deep slip-rate (33 mm/yr) and depth of the transition
between seismogenic and non-seismogenic slip (14 km) that agree better with independent geologic evidence than those found
in the 1987 study. In contrast to Harris and Segall [1987], we find no evidence of fault-normal contraction.
Received 22
June
2000;
accepted 16
October
2000.
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Citation: Murray, J. R., P. Segall, P. Cervelli, W. Prescott, and J. Svarc
(2001),
Inversion of GPS Data for Spatially Variable Slip-Rate on the San Andreas Fault near Parkfield, CA,
Geophys. Res. Lett.,
28(2),
359–362.
Copyright 2001 by the American Geophysical Union.
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