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    Estimating the horizontal and vertical direction-of-arrival of water-borne seismic signals in the northern Philippine Sea

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    1.4818843.pdf (5.535Mb)
    Date
    2013-10
    Author
    Freeman, Simon E.  Concept link
    D'Spain, Gerald L.  Concept link
    Lynch, Stephen D.  Concept link
    Stephen, Ralph A.  Concept link
    Heaney, Kevin D.  Concept link
    Murray, James J.  Concept link
    Baggeroer, Arthur B.  Concept link
    Worcester, Peter F.  Concept link
    Dzieciuch, Matthew A.  Concept link
    Mercer, James A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6464
    As published
    https://doi.org/10.1121/1.4818843
    DOI
    10.1121/1.4818843
    Abstract
    Conventional and adaptive plane-wave beamforming with simultaneous recordings by large-aperture horizontal and vertical line arrays during the 2009 Philippine Sea Engineering Test (PhilSea09) reveal the rate of occurrence and the two-dimensional arrival structure of seismic phases that couple into the deep ocean. A ship-deployed, controlled acoustic source was used to evaluate performance of the horizontal array for a range of beamformer adaptiveness levels. Ninety T-phases from unique azimuths were recorded between Yeardays 107 to 119. T-phase azimuth and S-minus-P-phase time-of-arrival range estimates were validated using United States Geological Survey seismic monitoring network data. Analysis of phases from a seismic event that occurred on Yearday 112 near the east coast of Taiwan approximately 450 km from the arrays revealed a 22° clockwise evolution of T-phase azimuth over 90 s. Two hypotheses to explain such evolution—body wave excitation of multiple sources or in-water scattering—are presented based on T-phase origin sites at the intersection of azimuthal great circle paths and ridge/coastal bathymetry. Propagation timing between the source, scattering region, and array position suggests the mechanism behind the evolution involved scattering of the T-phase from the Ryukyu Ridge and a T-phase formation/scattering location estimation error of approximately 3.2 km.
    Description
    Author Posting. © Acoustical Society of America, 2013. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 134 (2013): 3282, doi:10.1121/1.4818843.
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Journal of the Acoustical Society of America 134 (2013): 3282
     

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