Glacially generated overpressure on the New England continental shelf: Integration of full-waveform inversion and overpressure modeling

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dc.citation.firstpage3393en_US
dc.citation.issueNumber4en_US
dc.citation.journalTitleJournal of Geophysical Research: Solid Earthen_US
dc.citation.lastpage3409en_US
dc.citation.volumeNumber119en_US
dc.contributor.authorSiegel, Jacoben_US
dc.contributor.authorLizarralde, Danielen_US
dc.contributor.authorDugan, Brandonen_US
dc.contributor.authorPerson, Marken_US
dc.date.accessioned2014-07-30T16:23:12Z
dc.date.available2014-07-30T16:23:12Z
dc.date.issued2014en_US
dc.description.abstractLocalized zones of high-amplitude, discontinuous seismic reflections 100 km off the coast of Massachusetts, USA, have P wave velocities up to 190 m/s lower than those of adjacent sediments of equal depth (250m below the sea floor). To investigate the origin of these low-velocity zones, we compare the detailed velocity structure across high-amplitude regions to adjacent, undisturbed regions through full-waveform inversion. We relate the full-waveform inversion velocities to effective stress and overpressure with a power law model. This model predicts localized overpressures up to 2.2MPa associated with the high-amplitude reflections. To help understand the overpressure source, we model overpressure due to erosion, glacial loading, and sedimentation in one dimension. The modeling results show that ice loading from a late Pleistocene glaciation, ice loading from the Last Glacial Maximum, and rapid sedimentation contributed to the overpressure. Localized overpressure, however, is likely the result of focused fluid flow through a high-permeability layer below the region characterized by the high-amplitude reflections. These high overpressures may have also caused localized sediment deformation. Our forward models predict maximum overpressure during the Last Glacial Maximum due to loading by glaciers and rapid sedimentation, but these overpressures are dissipating in the modern, low sedimentation rate environment. This has important implications for our understanding continental shelf morphology, fluid flow, and submarine groundwater discharge off Massachusetts, as we show a mechanism related to Pleistocene ice sheets that may have created regions of anomalously high overpressure.en_US
dc.identifier.citationSiegel, Jacob, Lizarralde, Daniel, Dugan, Brandon, et al.. "Glacially generated overpressure on the New England continental shelf: Integration of full-waveform inversion and overpressure modeling." <i>Journal of Geophysical Research: Solid Earth,</i> 119, no. 4 (2014) Wiley: 3393-3409. http://dx.doi.org/10.1002/2013JB010278.
dc.identifier.doihttp://dx.doi.org/10.1002/2013JB010278en_US
dc.identifier.urihttps://hdl.handle.net/1911/76296
dc.language.isoengen_US
dc.publisherWiley
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titleGlacially generated overpressure on the New England continental shelf: Integration of full-waveform inversion and overpressure modelingen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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