Physics – Geophysics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..359m&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 2, p. 359-362
Physics
Geophysics
25
Geodesy And Gravity, Geodesy And Gravity: Crustal Movements-Interplate, Geodesy And Gravity: Space Geodetic Surveys, Mathematical Geophysics: Inverse Theory
Scientific paper
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.
Cervelli Peter
Murray James R.
Prescott W.
Segall Paul
Svarc Jerry
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