Marine Sediment Attenuation and Ocean-Bottom-Reflected Sound

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Abstract
The attenuation of sound in marine sediments is shown to depend on the first power of the frequency for a range of 100–1000 cps, and the relation between sediment attenuation and ocean-bottom reflectivity is discussed. The reflection process is approximated by a three-layer fluid model, with attenuation in the second and third layers. Theoretical reflection coefficients are calculated, considering the sediment attenuation as proportional to the one-half, first, and second powers of the frequency for comparison with measured coefficients. For the range of frequencies considered, the first-power frequency-attenuation law in the sediments is consistent with the observed dependence of the ocean-bottom reflectivity.

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