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    Ocean Bottom Seismometer Augmentation in the North Pacific (OBSANP) - cruise report

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    WHOI-2014-03.pdf (15.73Mb)
    Date
    2014-12
    Author
    Stephen, Ralph A.  Concept link
    Worcester, Peter F.  Concept link
    Udovydchenkov, Ilya A.  Concept link
    Aaron, Ernie  Concept link
    Bolmer, S. Thompson  Concept link
    Carey, Scott  Concept link
    McPeak, Sean P.  Concept link
    Swift, Stephen A.  Concept link
    Dzieciuch, Matthew A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7130
    Location
    33°25.135’N, 137°40.948’W
    North Pacific
    DOI
    10.1575/1912/7130
    Keyword
     Melville (Ship) Cruise MV1308; Underwater acoustics; Oceanographic instruments 
    Abstract
    The Ocean Bottom Seismometer Augmentation in the North Pacific Experiment (OBSANP, June-July, 2013, R/V Melville) addresses the coherence and depth dependence of deep-water ambient noise and signals. During the 2004 NPAL Experiment in the North Pacific Ocean, in addition to predicted ocean acoustic arrivals and deep shadow zone arrivals, we observed "deep seafloor arrivals" (DSFA) that were dominant on the seafloor Ocean Bottom Seismometer (OBS) (at about 5000m depth) but were absent or very weak on the Distributed Vertical Line Array (DVLA) (above 4250m depth). At least a subset of these arrivals correspond to bottomdiffracted surface-reflected (BDSR) paths from an out-of-plane seamount. BDSR arrivals are present throughout the water column, but at depths above the conjugate depth are obscured by ambient noise and PE predicted arrivals. On the 2004 NPAL/LOAPEX experiment BDSR paths yielded the largest amplitude seafloor arrivals for ranges from 500 to 3200km. The OBSANP experiment tests the hypothesis that BDSR paths contribute to the arrival structure on the deep seafloor even at short ranges (from near zero to 4-1/2CZ). The OBSANP cruise had three major research goals: a) identification and analysis of DSFA and BDSR arrivals occurring at short (1/2CZ) ranges in the 50 to 400Hz band, b) analysis of deep sea ambient noise in the band 0.03 to 80Hz, and c) analysis of the frequency dependence of BR and SRBR paths. On OBSANP we deployed a 32 element VLA from 12 to 1000m above the seafloor, eight short-period OBSs and four long-period OBSs and carried out a 15day transmission program using a J15-3 acoustic source.
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    • Geology and Geophysics (G&G)
    • WHOI Technical Reports
    Suggested Citation
    Stephen, R. A., Worcester, P. F., Udovydchenkov, I. A., Aaron, E., Bolmer, S. T., Carey, S., McPeak, S. P., Swift, S. A., & Dzieciuch, M. A. (2014). Ocean Bottom Seismometer Augmentation in the North Pacific (OBSANP) - cruise report. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/7130
     

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