Abstract
Measurements of ocean-bottom reflectivity were made in an area in the Caribbean Sea, using explosive sound sources. Observed bottom-reflection coefficients for various frequencies were determined for grazing angles between 2° and 85°. Theoretical reflection coefficients were computed, using a model that consists of a multilayered ocean bottom in which the lowermost layer is considered to be semiinfinite and solid. The layers are assumed to have plane parallel interfaces and to be absorbing. Sediment sound-speed measurements made on cores collected in the area, and used in the theoretical computations, indicate the ocean bottom in this region to be a low-velocity sediment interspersed with thin high-velocity layers. Oscillograph records made of the bottom-reflected signals show a phase reversal, with respect to the incident wave, at the angles theoretically predicted for the lowvelocity bottom. Comparisons of theoretical and measured reflection coefficients are made and indicate that the model is useful for predicting bottom reflectivity in this area.
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