Abstract
During the summer of 1987 a series of shallow-water experiments were performed for the purpose of determining the seismoacoustic properties of the unlithified sediments near the seafloor. These experiments, which utilized a small explosive source and a string of receivers on the seafloor, were designed to maximize the excitation of shear and interface waves. By using two-axis, gimballed geophones spaced at 5-m intervals along a cable, a robust set of data defining motion in a vertical plane parallel to the direction of propagation was obtained. By analyzing the dispersion of surface waves and the amplitude and travel time of diving shear waves, the data were inverted to obtain shear and dilatational wave velocity and the attenuation of shear waves as a function of depth. One data set for a thick sand deposit in New York Harbor showed strong gradients in velocity and attenuation near the water-sediment interface in good agreement with a theoretical model which takes into account the rapid change in effective stress (overburden pressure) in the near-bottom sediments. [Work sponsored by ONR, code 1125 QA.]
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