Finite-frequency traveltime tomography of San Francisco Bay region crustal velocity structure
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Abstract
Seismic velocity structure of the San Francisco Bay region crust is derived using measurements of finite-frequency traveltimes. A total of 57 801 relative traveltimes are measured by cross-correlation over the frequency range 0.5–1.5 Hz. From these are derived 4862 ‘summary’ traveltimes, which are used to derive 3-D P-wave velocity structure over a 341 × 140 km2 area from the surface to 25 km depth. The seismic tomography is based on sensitivity kernels calculated on a spherically symmetric reference model. Robust elements of the derived P-wave velocity structure are: a pronounced velocity contrast across the San Andreas fault in the south Bay region (west side faster); a moderate velocity contrast across the Hayward fault (west side faster); moderately low velocity crust around the Quien Sabe volcanic field and the Sacramento River delta; very low velocity crust around Lake Berryessa. These features are generally explicable with surface rock types being extrapolated to depth ∼10 km in the upper crust. Generally high mid-lower crust velocity and high inferred Poisson's ratio suggest a mafic lower crust.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Finite-frequency traveltime tomography of San Francisco Bay region crustal velocity structure |
| Series title | Geophysical Journal International |
| DOI | 10.1111/j.1365-246X.2007.03532.x |
| Volume | 171 |
| Issue | 2 |
| Year Published | 2007 |
| Language | English |
| Publisher | Oxford Academic |
| Description | 27 p. |
| First page | 630 |
| Last page | 656 |
| Country | United States |
| State | California |
| Other Geospatial | San Francisco Bay region |
| Google Analytic Metrics | Metrics page |