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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