Fine-scale structure of the San Andreas fault zone and location of the SAFOD target earthquakes
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Abstract
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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Fine-scale structure of the San Andreas fault zone and location of the SAFOD target earthquakes |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2003GL019398 |
| Volume | 31 |
| Issue | 12 |
| Year Published | 2004 |
| Language | English |
| Publisher | American Geophysical Union |
| Description | L12S02, 4 p. |
| Country | United States |
| State | California |
| Other Geospatial | San Andreas Fault |
| Google Analytic Metrics | Metrics page |