The long-awaited Parkfield, California, earthquake occurred on September 28, 2004. This Mw 6.0 event was the latest in a series of moderate quakes (occuring approximately every 22 years) to strike the Parkfield segment of the San Andreas fault dating back to the nineteenth century. In anticipation of the repeat event a variety of geophysical instruments have been operating in Parkfield since the mid-1980s. Unfortunately, data from these instruments show no discernable precursory phenomena to the magnitude zero level (Langbein et al., 2005). Nevertheless, the 2004 event was extremely well recorded by the seismic stations of the California Integrated Seismic Network, and continuous GPS sites, and therefore offers the best opportunity to date to learn about the physics of earthquake rupture. With the numerous near-fault stations from the USGS and CGS strong motion networks high resolution models of the kinematic rupture process are obtainable.
In this report we present our preliminary kinematic modeling results using local and regional seismic waveform data and the continuous GPS data.
Berkeley Seismological Laboratory
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