Abstract
A previously developed theory enables seabed shear modulus profiles to be calculated through the combination of water wave‐seabed interaction theories and geophysical inversion methods. A new instrumentation system, consisting of three orthogonally mounted accelerometers and a pressure sensor, has been developed to measure water wave‐induced pressures and seabed motions. This new passive remote system provides a fast and convenient method to determine in situ sediment shear modulus with depth profiles, without disturbing the sediment or drilling. Experiments have been conducted in various sediments and water depths off the coast of New Jersey. Extensive experimental data reduction techniques are developed to deal with real ocean data. Actual experimental results are given, along with quantitative measures of uncertainty and resolution. Comparisons between the experimental shear modulus inversions, in situ sediment strength tests, and laboratory analysis of core samples show that this method can accurately...
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