A tomographic image of mantle structure beneath southern California

Details A tomographic image of mantle structure beneath southern California A tomographic image of mantle structure beneath southern California

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..625h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, July 1984, p. 625-627. Sponsorship: U.S. Geological Survey.

Mathematics

Logic

95

Earth Mantle, Earth Planetary Structure, Seismic Waves, Southern California, Tomography, P Waves, Propagation Velocity, San Andreas Fault, Subduction (Geology), Wave Propagation

Scientific paper

The variations in seismic structure beneath southern California were determined by using a tomographic method of inversion on teleseismic P delays recorded with the Southern California Array. The inversion reveals two prominent features beneath the region. The first is a thin, vertical wedge directly beneath the Transverse Ranges that is 2-3 percent faster than the surrounding region. This feature deepens to the east, attaining a maximum depth of about 250 km beneath the San Bernardino Mountains. The second feature is a major zone of low velocity material that is 2-4 percent slow under the Salton Trough rift valley, extending to a depth of about 125 km. Two possible explanations for the spatial association of the Transverse Ranges with the velocity anomaly below are lithospheric subduction or small-scale sublithospheric convection in the region of the Big Bend of the San Andreas Fault. The low velocity anomaly beneath the Salton Trough is consistent with convective upwelling there.

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