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dc.contributor.authorStephen, Ralph A.  Concept link
dc.contributor.authorSwift, Stephen A.  Concept link
dc.contributor.authorBolmer, S. Thompson  Concept link
dc.date.accessioned2009-01-08T13:51:48Z
dc.date.available2009-01-08T13:51:48Z
dc.date.issued1987-03
dc.identifier.urihttps://hdl.handle.net/1912/2640
dc.description.abstractThis report describes a preliminary analysis of borehole seismic data to determine VLF/Sub-bottom Seismic Noise in the Atlantic and the preliminary results of finite difference modelling for a Cape Fear environment. Noise levels were not a simple function of depth and there are indications that noise levels may depend on local geology about a given receiver position and/or on clamping. Coherency of the noise was generally poor (<0.8) and was independent of depth. There is no evidence for distinct polarizations or directionality of the noise. The lowest determined value for ambient noise power on the vertical component was 10-4 nm2/Hz in the frequency range from 5-50 Hz. The better clamped horizontal component had comparable power values. In conclusion, although the drill ship was on the site and drill pipe was in the hole, analysis of the data for a large number of windows can provide meaningful upper bounds on the ambient noise levels in the upper crust.en
dc.description.sponsorshipPrepared for the Naval Ocean Research and Development Activity as the final report for Contract Purchase Order No. N62306-86-l4-7589en
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherWoods Hole Oceanographic Institutionen
dc.relation.ispartofseriesWHOI Technical Memorandaen
dc.relation.ispartofseriesWHOI-4-87en
dc.subjectAmbient soundsen
dc.subjectSeismologyen
dc.titleAmbient noise analysis and finite difference modelling of VLF borehole seismic dataen
dc.typeWorking Paperen
dc.identifier.doi10.1575/1912/2640


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