Three-dimensional numerical modeling of bottom-diffracted surface-reflected arrivals in the North Pacific [poster] Stephen, Ralph A. Udovydchenkov, Ilya A. Bolmer, S. Thompson Komatitsch, Dimitri Tromp, Jeroen Casarotti, Emanuele Xie, Zhinan Worcester, Peter F. 2016-01-20T17:15:37Z 2016-01-20T17:15:37Z 2015-12-15
dc.description Poster presented AGU Fall Meeting, San Francisco, Californai USA, December 14-18, 2015 en_US
dc.description.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. en_US
dc.description.sponsorship The data acquisition was funded by the Office of Naval Research and the computer modeling using SPECFEM3D was supported by the National Science Foundation. en_US
dc.format.mimetype application/pdf
dc.identifier.doi 10.1575/1912/7740
dc.language.iso en_US en_US
dc.title Three-dimensional numerical modeling of bottom-diffracted surface-reflected arrivals in the North Pacific [poster] en_US
dc.type Presentation en_US
dspace.entity.type Publication
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