At some locations offshore, seismic records degenerate into nearly sinusoidal waves or simple combinations of nearly sinusoidal waves despite the fact that the recording may be made with little or no seismic filtering. Results from field experiments indicate that this “singing” phenomenon is caused by the reflections themselves exciting an acoustic resonant layer formed by the ocean surface and bottom. A simple theoretical model predicts the mode of excitation and the frequency, depth, and range dependence which are verified by controlled field experiments.

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