Attenuation coefficients of compressional waves in noncohesive, water-saturated sediments vary linearly with frequency. Biot's theory, whch accounts for attenuation in terms of the viscous interaction between solid particles and pore fluid, predicts in its presently published form variation proportional to f 2 at low frequencies and f (super 1/2) at high frequencies. A modification of Biot's theory which incorporates a distribution of pore sizes gives excellent agreement with new and published attenuation data in the frequency range 10 kHz to 2.25 MHz. A linear variation of attenuation with frequency is predicted in that range.--Modified authors' abstract.

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