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1 Institute for Crustal
Studies
Girvetz Hall
University of California
Santa Barbara, California
93106
pcliu{at}crustal.ucsb.edu
susana{at}crustal.ucsb.edu
ralph{at}crustal.ucsb.edu
(P.L.,
S.C., R.J.A.)
2 Department of Earth Science
Webb
Hall
University of California
Santa Barbara, California
93106
(S.C., R.J.A.)
The 2004 M 6.0 Parkfield earthquake yielded one of the largest amounts
of near-source strong ground motion seismic data ever. We invert strong-motion
seismograms to obtain a model for the space–time distribution of coseismic
slip on the fault. To reduce noise in the inversion, we take into account local
amplifications that affect each station by using records of the 1983 M
6.5 Coalinga earthquake. Site amplification correlates well with large peak
ground velocities registered during the 2004 Parkfield mainshock. The inversion
for a kinematic rupture model yields a nonunique solution; we therefore analyze
various rupture models that explain the data equally well. Our preferred rupture
model identifies a primary zone of high slip surrounding the hypocenter, where
the maximum slip is 57 cm. A secondary slip area, over which contours are not
well resolved, is located northwest of the hypocenter. The rupture speed is
highly heterogeneous. We infer an average rupture velocity of 
2.8 km/sec
close to the hypocenter, and of 3.3 km/sec in the secondary region of large
slip to the northwest of the hypocenter. By correlation of our rupture model
with both microseismicity and velocity structure, we identify six patches on the
fault plane that behave in seismically distinct ways.
Online material: Kinematic rupture model parameters.
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