Abstract
One unreversed seismic refraction profile, 33 km in length, was made northeast of the Bahama Islands to demonstrate and evaluate the feasibility of utilizing conventional shallow water seismic exploration techniques and equipment for oceanic crustal studies. This procedure requires the recording boat, towing a 1-mile-long, 24-hydrophone-group cable, to move away from a shooting boat which is held on a fixed position. Charges are detonated electrically each time the towed cable traverses its own length. Seismic velocities can be identified with a single shot at a relatively short distance by observing arrivals over the known length of cable. Dip determination from a reflection profile permitted an unambiguous refraction interpretation. Apparent compressional wave velocities of 2.18, 4.98, 5.74, and 7.04 km/sec were observed and tentatively interpreted, respectively, as a semiconsolidated sedimentary layer 1.67 km thick, a consolidated sedimentary rock or crustal rock layer 1.14 km thick, a granitic layer 1.85 km thick, and an underlying layer of undetermined thickness of gabbro or oceanic crust. Seismic wave velocities and calculated depth and thickness figures agree favorably with previously published seismic data.
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