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The phase velocity and the attenuation of acoustic waves in water-saturated sandy sediment are experimentally and theoretically investigated in the frequency range of 0.151 MHz. In order to explain the experimental measurements, we use Biot's theory for acoustic wave propagation in a uid-saturated, porous, elastic, solid medium. The signals transmitted through water-saturated sandy sediment are identi ed as fast waves. The experimental phase velocity of the fast wave, which is not sensitive to variations in the values of the estimated Biot's parameter, is in good agreement with the theoretical one. The experimental attenuation of the fast wave also agrees well with the theoretical value over the frequency range from 0.15 to 0.7 MHz, but not over the frequency range from 0.7 to 1 MHz. The experimental phase velocity and the attenuation of the fast wave can be used as background acoustic data for estimating the gas void fraction in marine sandy sediment containing gas bubbles.