Fine-scale structure of the San Andreas fault zone and location of the SAFOD target earthquakes

Details Fine-scale structure of the San Andreas fault zone and location of the SAFOD target earthquakes Fine-scale structure of the San Andreas fault zone and location of the SAFOD target earthquakes

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3112s02t&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 12, CiteID L12S02

Physics

19

Seismology: Body Wave Propagation, Seismology: Continental Crust (1242), Seismology: Earthquake Parameters, Structural Geology: Local Crustal Structure, Tectonophysics: Tomography

Scientific paper

We present results from the tomographic analysis of seismic data from the Parkfield area using three different inversion codes. The models provide a consistent view of the complex velocity structure in the vicinity of the San Andreas, including a sharp velocity contrast across the fault. We use the inversion results to assess our confidence in the absolute location accuracy of a potential target earthquake. We derive two types of accuracy estimates, one based on a consideration of the location differences from the three inversion methods, and the other based on the absolute location accuracy of ``virtual earthquakes.'' Location differences are on the order of 100-200 m horizontally and up to 500 m vertically. Bounds on the absolute location errors based on the ``virtual earthquake'' relocations are ~50 m horizontally and vertically. The average of our locations places the target event epicenter within about 100 m of the SAF surface trace.

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