Deep seafloor arrivals: An unexplained set of arrivals in long-range ocean acoustic propagation

Receptions, from a ship-suspended source (in the band 50-100 Hz) to an ocean bottom seismometer (about 5000 m depth) and the deepest element on a vertical hydrophone array (about 750 m above the seafloor) that were acquired on the 2004 Long-Range Ocean Acoustic Propagation Experiment in the North Pa...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2009-08, Vol.126 (2), p.599-606
Main Authors: STEPHEN, Ralph A, BOLMER, S. Thompson, DZIECIUCH, Matthew A, WORCESTER, Peter F, ANDREW, Rex K, BUCK, Linda J, MERCER, James A, COLOSI, John A, HOWE, Bruce M
Format: Article
Language:English
Subjects:
Acoustics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Marine
Physics
Underwater sound
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Summary:Receptions, from a ship-suspended source (in the band 50-100 Hz) to an ocean bottom seismometer (about 5000 m depth) and the deepest element on a vertical hydrophone array (about 750 m above the seafloor) that were acquired on the 2004 Long-Range Ocean Acoustic Propagation Experiment in the North Pacific Ocean, are described. The ranges varied from 50 to 3200 km. In addition to predicted ocean acoustic arrivals and deep shadow zone arrivals (leaking below turning points), "deep seafloor arrivals," that are dominant on the seafloor geophone but are absent or very weak on the hydrophone array, are observed. These deep seafloor arrivals are an unexplained set of arrivals in ocean acoustics possibly associated with seafloor interface waves.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.3158826