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Observations of sound radiated by breaking surface waves have been detected with a four-hydrophone array in the open ocean. Time delay measurement is used to evaluate the position of individual breaking events. However, the coherence between different pairs of hydrophones is anisotropic. Together with the spectral distribution, these signals are interpreted in terms of the spatial distribution and nature of the sound generation mechanism.
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Farmer et al. (1992) studied this question.
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