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    Analysis of Deep Seafloor Arrivals observed on NPAL04

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    WHOI-2012-09.pdf (20.58Mb)
    Date
    2012-12
    Author
    Stephen, Ralph A.  Concept link
    Bolmer, S. Thompson  Concept link
    Udovydchenkov, Ilya A.  Concept link
    Dzieciuch, Matthew A.  Concept link
    Worcester, Peter F.  Concept link
    Andrew, Rex K.  Concept link
    Mercer, James A.  Concept link
    Colosi, John A.  Concept link
    Howe, Bruce M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5736
    DOI
    10.1575/1912/5736
    Keyword
     Underwater acoustics; Ambient sounds 
    Abstract
    This report gives an overview of the analysis that was done on Deep Seafloor Arrivals since they were initially presented in Stephen et al (2009). All of the NPAL04/LOAPEX (North Pacific Acoustic Laboratory, 2004/ Long Range Ocean Acoustic Propagation Experiment) data on three ocean bottom seismometers (OBSs) at ~5,000m depth and the deepest element of the deep vertical line array (DVLA) at 4250m depth has been analyzed. A distinctive pattern of late arrivals was observed on the three OBSs for transmissions from T500 to T2300. The delays of these arrivals with respect to the parabolic equation predicted (PEP) path were the same for all ranges from 500 to 2300km, indicating that the delay was introduced near the receivers. At 500km range the same arrival was observed throughout the water column on the DVLA. We show that arrivals in this pattern converted from a PEP path to a bottom-diffracted surface reflected (BDSR) path at an off-geodesic seamount.
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    • Geology and Geophysics (G&G)
    • WHOI Technical Reports
    Suggested Citation
    Stephen, R. A., Bolmer, S. T., Udovydchenkov, I. A., Dzieciuch, M. A., Worcester, P. F., Andrew, R. K., Mercer, J. A., Colosi, J. A., & Howe, B. M. (2012). Analysis of Deep Seafloor Arrivals observed on NPAL04. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/5736
     
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