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dc.contributor.authorStephen, Ralph A.  Concept link
dc.contributor.authorWorcester, Peter F.  Concept link
dc.contributor.authorUdovydchenkov, Ilya A.  Concept link
dc.contributor.authorAaron, Ernie  Concept link
dc.contributor.authorBolmer, S. Thompson  Concept link
dc.contributor.authorCarey, Scott  Concept link
dc.contributor.authorMcPeak, Sean P.  Concept link
dc.contributor.authorSwift, Stephen A.  Concept link
dc.contributor.authorDzieciuch, Matthew A.  Concept link
dc.coverage.spatial33°25.135’N, 137°40.948’W
dc.coverage.spatialNorth Pacific
dc.date.accessioned2015-02-03T16:42:44Z
dc.date.available2015-02-03T16:42:44Z
dc.date.issued2014-12
dc.identifier.urihttps://hdl.handle.net/1912/7130
dc.description.abstractThe 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.en_US
dc.description.sponsorshipFunding was provided by the Office of Naval Research under contract #'s N00014-10-1-0987 and N00014-10-1-0510en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherWoods Hole Oceanographic Institutionen_US
dc.relation.ispartofseriesWHOI Technical Reportsen_US
dc.relation.ispartofseriesWHOI-2014-03en_US
dc.subjectMelville (Ship) Cruise MV1308en_US
dc.subjectUnderwater acoustics
dc.subjectOceanographic instruments
dc.titleOcean Bottom Seismometer Augmentation in the North Pacific (OBSANP) - cruise reporten_US
dc.typeTechnical Reporten_US
dc.identifier.doi10.1575/1912/7130


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