Abstract
Submarine volcanic event often generates acoustic waves (T‐waves) traveling over long distances through the low velocity channel (SOFAR) of the ocean. By a method of coherent stacking of T‐waves from a submarine volcanic activity in northern Mariana, we found a significant semidiurnal variation of T‐wave travel times. The amplitude of variation is an order of larger than those reported in the previous ocean sound transmission experiments. Ray‐theoretical consideration for the numerically simulated ocean tides indicates that such large T‐phase travel time variation is a consequence of large up‐and‐down movement of seawater around the axis of the SOFAR channel due to the M2 internal tide effectively converted from external tidal forcing. T‐phases, a ubiquitous feature of the ocean acoustic noise field, can be used to infer internal tidal motion and the associated ocean mixing.
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