Jr. Murray et al., Inversion of GPS data for spatially variable slip-rate on the San Andreas Fault near Parkfield, CA, GEOPHYS R L, 28(2), 2001, pp. 359-362
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 a
n 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 collect
ed 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 a
gree better with independent geologic evidence than those found in the 1987
study. In contrast to Harris and Segall [1987], we find no evidence of fau
lt-normal contraction.