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    Seabed fluid expulsion along the upper slope and outer shelf of the U.S. Atlantic continental margin

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    Supporting information (73.41Kb)
    Detailed map of data coverage along the Hudson Apron/southern New England region (2.077Mb)
    Detailed description of methodology (1.129Mb)
    Date
    2014-01-08
    Author
    Brothers, Daniel S.  Concept link
    Ruppel, Carolyn D.  Concept link
    Kluesner, Jared W.  Concept link
    ten Brink, Uri S.  Concept link
    Chaytor, Jason D.  Concept link
    Hill, Jenna C.  Concept link
    Andrews, Brian D.  Concept link
    Flores, Claudia H.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6601
    As published
    https://doi.org/10.1002/2013GL058048
    DOI
    10.1002/2013GL058048
    Keyword
     Seismic stratigraphy; Pockmark; Gas hydrate; Fluid expulsion; Submarine landslide; Attribute analysis 
    Abstract
    Identifying the spatial distribution of seabed fluid expulsion features is crucial for understanding the substrate plumbing system of any continental margin. A 1100 km stretch of the U.S. Atlantic margin contains more than 5000 pockmarks at water depths of 120 m (shelf edge) to 700 m (upper slope), mostly updip of the contemporary gas hydrate stability zone (GHSZ). Advanced attribute analyses of high-resolution multichannel seismic reflection data reveal gas-charged sediment and probable fluid chimneys beneath pockmark fields. A series of enhanced reflectors, inferred to represent hydrate-bearing sediments, occur within the GHSZ. Differential sediment loading at the shelf edge and warming-induced gas hydrate dissociation along the upper slope are the proposed mechanisms that led to transient changes in substrate pore fluid overpressure, vertical fluid/gas migration, and pockmark formation.
    Description
    Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 41 (2014): 96-101, doi:10.1002/2013GL058048.
    Collections
    • Energy and Geohazards
    Suggested Citation
    Geophysical Research Letters 41 (2014): 96-101
     

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