Finite-frequency traveltime tomography of San Francisco Bay region crustal velocity structure

Details Finite-frequency traveltime tomography of San Francisco Bay region crustal velocity structure Finite-frequency traveltime tomography of San Francisco Bay region crustal velocity structure

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007geoji.171..630p&link_type=abstract

Geophysical Journal International, Volume 171, Issue 2, pp. 630-656.

Astronomy and Astrophysics

Astronomy

1

Body Waves, Finite-Frequency Traveltimes, Seismic Tomography

Scientific paper

Seismic velocity structure of the San Francisco Bay region crust is derived using measurements of finite-frequency traveltimes. A total of 57801 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.

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