Submarine volcanic activity, ocean-acoustic waves and internal ocean tides

Details Submarine volcanic activity, ocean-acoustic waves and internal ocean tides Submarine volcanic activity, ocean-acoustic waves and internal ocean tides

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3224616s&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 24, CiteID L24616

Computer Science

Sound

Oceanography: General: Ocean Acoustics, Oceanography: Physical: Internal And Inertial Waves, Seismology: General Or Miscellaneous, Seismology: Volcano Seismology (8419)

Scientific paper

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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