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    Three-dimensional numerical modeling of bottom-diffracted surface-reflected arrivals in the North Pacific [poster]

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    AGU_2015_Poster_11.pdf (40.68Mb)
    Date
    2015-12-15
    Author
    Stephen, Ralph A.  Concept link
    Udovydchenkov, Ilya A.  Concept link
    Bolmer, S. Thompson  Concept link
    Komatitsch, Dimitri  Concept link
    Tromp, Jeroen  Concept link
    Casarotti, Emanuele  Concept link
    Xie, Zhinan  Concept link
    Worcester, Peter F.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7740
    DOI
    10.1575/1912/7740
    Abstract
    Bottom-diffracted surface-reflected (BDSR) arrivals were first identified in the 2004 Long-range Ocean Acoustic Propagation Experiment (Stephen et al, 2013, JASA, v.134, p.3307-3317). The BDSR mechanism provides a means for acoustic signals and noise from distant sources to appear with significant strength on the deep seafloor. At depths deeper than the conjugate depth ambient noise and PE- predicted arrivals are sufficiently quiet that BDSR paths, scattered from small seamounts, can be the largest amplitude arrivals observed. The Ocean Bottom Seismometer Augmentation in the North Pacific (OBSANP) Experiment in June-July 2013 was designed to further define the characteristics of the BDSRs and to understand the conditions under which BDSRs are excited and propagate. The reciprocal of the BDSR mechanism also plays a role in T-phase excitation. To further understand the BDSR mechanism, the SPECFEM3D code was extended to handle high-frequency, deep water bottom scattering problems with actual bathymetry and a typical sound speed profile in the water column. The model size is 38km x 27km x 6.5km. The source is centered at 10Hz with a 5Hz bandwidth. Work supported by NSF and ONR.
    Description
    Poster presented AGU Fall Meeting, San Francisco, Californai USA, December 14-18, 2015
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Presentation: Stephen, Ralph A., Udovydchenkov, Ilya A., Bolmer, S. Thompson, Komatitsch, Dimitri, Tromp, Jeroen, Casarotti, Emanuele, Xie, Zhinan, Worcester, Peter F., "Three-dimensional numerical modeling of bottom-diffracted surface-reflected arrivals in the North Pacific [poster]", Poster presented AGU Fall Meeting, San Francisco, Californai USA, December 14-18, 2015, DOI:10.1575/1912/7740, https://hdl.handle.net/1912/7740
     
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