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dc.contributor.authorBromirski, Peter D.  Concept link
dc.contributor.authorStephen, Ralph A.  Concept link
dc.contributor.authorGerstoft, Peter  Concept link
dc.date.accessioned2013-11-12T20:30:17Z
dc.date.available2014-10-22T08:57:21Z
dc.date.issued2013-07-25
dc.identifier.citationJournal of Geophysical Research: Solid Earth 118 (2013): 3610–3629en_US
dc.identifier.urihttps://hdl.handle.net/1912/6293
dc.descriptionAuthor Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 118 (2013): 3610–3629, doi:10.1002/jgrb.50268.en_US
dc.description.abstractRecent studies attribute land double-frequency (DF) microseism observations to deep water generation. Here we show that near-coastal generation is generally the dominant source region. This determination is based on observations at land and ocean seismic stations, buoys, gravity-wave hindcasts, and on beamforming results from continental seismic arrays. Interactions between opposing ocean wave components generate a pressure excitation pulse at twice the ocean wave frequency that excites pseudo-Rayleigh (pRg) wave DF microseisms. pRg generated in shallow coastal waters have most of their energy in the solid Earth (“elastic” pRg) and are observed by land-based and seafloor seismometers as DF microseisms. pRg generated in the deep ocean have most of their energy in the ocean (“acoustic” pRg) and are continuously observed on the ocean bottom, but acoustic pRg does not efficiently transition onto continents. High-amplitude DF signals over the [0.2, 0.3] Hz band observed on the deep seafloor are uncorrelated with continental observations and are not clearly detectable at individual continental stations or by land seismic-array beamforming. Below 0.2 Hz, modeling and some observations suggest that some deep water-generated elastic pRg energy can reach continental stations, providing that losses from scattering and transition across the continental-shelf boundary to the shore are not substantial. However, most observations indicate that generally little deep-ocean-generated DF microseism energy reaches continental stations. Effectively, DF land observations are dominated by near-coastal wave activity.en_US
dc.description.sponsorshipThis work was supported by NSF grant OCE-1030022, the California Department of Boating and Waterways, NOAA grant NA10OAR4310121, and the Edward W. and Betty J. Scripps Chair for Excellence in Oceanography at WHOI (RAS).en_US
dc.format.mimetypeapplication/pdf
dc.format.mimetypeapplication/msword
dc.format.mimetypetext/plain
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/jgrb.50268
dc.subjectDouble-frequency microseismsen_US
dc.subjectDeep-ocean wave interactionsen_US
dc.subjectPseudo-Rayleigh wavesen_US
dc.subjectNear-coastal DF microseism generationen_US
dc.subjectBeamformingen_US
dc.subjectTime-domain finite-differenceen_US
dc.titleAre deep-ocean-generated surface-wave microseisms observed on land?en_US
dc.typeArticleen_US
dc.description.embargo2014-01-25en_US
dc.identifier.doi10.1002/jgrb.50268


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