Experiments were made in the laboratory to measure the velocity of propagation of compressional and transverse elastic waves in ocean sediments while under varying conditions of compacting pressure. Various attempts to formulate expressions relating velocity with composition are discussed and are found to be not applicable to compacted sediments. The concept of a structure bulk modulus is introduced to account for the observed velocity changes.Shear waves were observed at compacting pressures exceeding 500 kg/sq cm. The effects of hydrostatic pressure and the development of anisotropy are also studied.

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