A geophysical survey, about 4,900 line-miles of multisensor highresolution data, was run in 217 tracts selected by the U. S. Department of the Interior for sale in the southern California Federal Outer Continental Shelf (OCS) Oil and Gas Lease Sale 48. The geophysical systems used in the survey were a 7 kHz tuned transducer, a 1.5 kJ Acoustipulse, and a dual-channel optically stacked 10 kJ sparker with accompanying digitally processed shallow seismic profiles (deconvolved dual-channel sparker). Existing and potential geologic hazards and constraints were determined from the geophysical data. The geologic hazards in the Sale 48 area are mass movement of sediments, shallow faults, steep slopes, and steep-walled submarine canyons; constraints to oil and gas development include shallow gas, gas-charged sediments, water-column anomalies, and seep mounds. Of the original 217 tracts, 69 were withdrawn from the Sale by the U. S. Department of the Interior; 18 tracts, showing evidence of past or potential sea-floor instability, were included in the sale, but with stipulations attached. Ultimately, 148 tracts were offered in the Lease Sale of June 29, 1979.
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