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    Triggering mechanism and tsunamogenic potential of the Cape Fear Slide complex, U.S. Atlantic margin

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    2007GC001722.pdf (1017.Kb)
    Date
    2007-12-28
    Author
    Hornbach, Matthew J.  Concept link
    Lavier, Luc L.  Concept link
    Ruppel, Carolyn D.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3267
    As published
    https://doi.org/10.1029/2007GC001722
    DOI
    10.1029/2007GC001722
    Keyword
     Submarine slides; Tsunami; Gas hydrates; Continental margins; Salt tectonics 
    Abstract
    Analysis of new multibeam bathymetry data and seismic Chirp data acquired over the Cape Fear Slide complex on the U.S. Atlantic margin suggests that at least 5 major submarine slides have likely occurred there within the past 30,000 years, indicating that repetitive, large-scale mass wasting and associated tsunamis may be more common in this area than previously believed. Gas hydrate deposits and associated free gas as well as salt tectonics have been implicated in previous studies as triggers for the major Cape Fear slide events. Analysis of the interaction of the gas hydrate phase boundary and the various generations of slides indicates that only the most landward slide likely intersected the phase boundary and inferred high gas pressures below it. For much of the region, we believe that displacement along a newly recognized normal fault led to upward migration of salt, oversteepening of slopes, and repeated slope failures. Using new constraints on slide morphology, we develop the first tsunami model for the Cape Fear Slide complex. Our results indicate that if the most seaward Cape Fear slide event occurred today, it could produce waves in excess of 2 m at the present-day 100 m bathymetric contour.
    Description
    Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 8 (2007): Q12008, doi:10.1029/2007GC001722.
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    • Energy and Geohazards
    Suggested Citation
    Geochemistry Geophysics Geosystems 8 (2007): Q12008
     

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