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    Three-dimensional bottom diffraction in the North Pacific

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    Article (4.246Mb)
    Supplemental (23.73Mb)
    Date
    2019-09-30
    Author
    Stephen, Ralph A.  Concept link
    Bolmer, S. Thompson  Concept link
    Worcester, Peter F.  Concept link
    Dzieciuch, Matthew A.  Concept link
    Udovydchenkov, Ilya A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/25068
    As published
    https://doi.org/10.1121/1.5125427
    DOI
    10.1121/1.5125427
    Abstract
    A significant aspect of bottom-interaction in deep water acoustic propagation, from point sources to point receivers, is the diffraction (or scattering) of energy from discrete seafloor locations along repeatable, deterministic paths in three-dimensions. These bottom-diffracted surface-reflected (BDSR) paths were first identified on the North Pacific acoustic laboratory experiment in 2004 (NPAL04) for a diffractor located on the side of a small seamount. On the adjacent deep seafloor, ambient noise and propagation in the ocean sound channel were sufficiently quiet that the BDSRs were the dominant arrival. The ocean bottom seismometer augmentation in the North Pacific (OBSANP) experiment in June–July 2013 studied BDSRs at the NPAL04 site in more detail. BDSRs are most readily identified by the arrival time of pulses as a function of range to the receiver for a line of transmissions. The diffraction points for BDSRs occur on the relatively featureless deep seafloor as well as on the sides of small seamounts. Although the NPAL04 and OBSANP experiments had very different geometries the same diffractor location is consistent with observed arrivals in both experiments within the resolution of the analysis. On OBSANP the same location excites BDSRs for 77.5, 155, and 310 Hz transmissions.
    Description
    Author Posting. © Acoustical Society of America, 2019. 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 146(3), (2019): 1913-1922, doi:10.1121/1.5125427.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Stephen, R. A., Bolmer, S. T., Worcester, P. F., Dzieciuch, M. A., & Udovydchenkov, I. A. (2019). Three-dimensional bottom diffraction in the North Pacific. Journal of the Acoustical Society of America, 146(3), 1913-1922.
     
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