An ocean-bottom earthquake is modelled as motion of a rigid boundary adjacent to a fluid half-space. The resulting water pressure, for a wide class of source motions, is obtained exactly as a convolution integral. The kernel has a physical interpretation as a fundamental solution, and may be obtained explicitly by a Cagniard method. A worked example is given, in which the convolution is carried out, and steps in pressure are found which are approximately equivalent to an extra 200 m in the water column.

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