A merine seismic refraction study of the Santa Barbara Channel,California |
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| Authors: | Greg J Crandall Bruce P Luyendyk Michael S Reichle William A Prothero |
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| Institution: | 1. Marine Science Institute University of California, 93106, Santa Barbara, CA, U.S.A.
2. Department of Geological Sciences, University of California, 93106, Santa Barbara, CA, U.S.A.
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| Abstract: | Seismic data from a 186 km-long refraction profile in the Santa Barbara Channel have been interpreted using several velocity inversion techniques. Data were obtained during two cruises in 1978 and 1979. Seismic arrivals from fifty explosions of between 1 and 300 lbs. of TNT were recorded by two ocean bottom seismometers, four permanent ocean bottom stations (University of Southern California), and much of the United States Geological Survey/California Institute of Technology southern California seismic network. Travel-time inversion gives a V p of 6.3 km sec-1 at 7.2 km depth above 7.2 km sec-1 at 14.4 km depth at the western end of the channel. At the eastern end, solutions suggest three sediment refractors overlying V p of 6.4 km sec-1 at 7.3 km depth, above 7.0 km sec-1 at 11.6 km depth, above mantle arrivals with V p of 8.3 km sec-1 at 21.8 km depth. The velocity structure determined by these methods suggests that the channel has a sedimentary fill of from 4 to 7 km and a layer of mafic plus ultramafic rock 14 to 17 km thick. The greatest thicknesses of sediments are restricted to east of Point Conception. The velocity data also suggest that the Franciscan formation may not be present beneath the channel. Rather, the crust here may represent a thickened portion of the Coast Range ophiolite. |
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