• Login
    About WHOAS
    View Item 
    •   WHOAS Home
    • USGS Woods Hole Coastal and Marine Science Center
    • Coastal and Shelf Geology
    • View Item
    •   WHOAS Home
    • USGS Woods Hole Coastal and Marine Science Center
    • Coastal and Shelf Geology
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of WHOASCommunities & CollectionsBy Issue DateAuthorsTitlesKeywordsThis CollectionBy Issue DateAuthorsTitlesKeywords

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    Subsea ice-bearing permafrost on the U.S. Beaufort Margin : 1. Minimum seaward extent defined from multichannel seismic reflection data

    Thumbnail
    View/Open
    Article (2.780Mb)
    Supporting Information (106.5Kb)
    Date
    2016-11-04
    Author
    Brothers, Laura L.  Concept link
    Herman, Bruce M.  Concept link
    Hart, Patrick E.  Concept link
    Ruppel, Carolyn D.  Concept link
    Metadata
    Show full item record
    Citable URI
    https://hdl.handle.net/1912/8744
    As published
    https://doi.org/10.1002/2016GC006584
    DOI
    10.1002/2016GC006584
    Keyword
     Subsea permafrost; Gas hydrates; Multichannel seismic data; Arctic Ocean 
    Abstract
    Subsea ice-bearing permafrost (IBPF) and associated gas hydrate in the Arctic have been subject to a warming climate and saline intrusion since the last transgression at the end of the Pleistocene. The consequent degradation of IBPF is potentially associated with significant degassing of dissociating gas hydrate deposits. Previous studies interpreted the distribution of subsea permafrost on the U.S. Beaufort continental shelf based on geographically sparse data sets and modeling of expected thermal history. The most cited work projects subsea permafrost to the shelf edge (∼100 m isobath). This study uses a compilation of stacking velocity analyses from ∼100,000 line-km of industry-collected multichannel seismic reflection data acquired over 57,000 km2 of the U.S. Beaufort shelf to delineate continuous subsea IBPF. Gridded average velocities of the uppermost 750 ms two-way travel time range from 1475 to 3110 m s−1. The monotonic, cross-shore pattern in velocity distribution suggests that the seaward extent of continuous IBPF is within 37 km of the modern shoreline at water depths < 25 m. These interpretations corroborate recent Beaufort seismic refraction studies and provide the best, margin-scale evidence that continuous subsea IBPF does not currently extend to the northern limits of the continental shelf.
    Description
    Author Posting. © American Geophysical Union, 2016. 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 17 (2016): 4354–4365, doi:10.1002/2016GC006584.
    Collections
    • Coastal and Shelf Geology
    • Energy and Geohazards
    Suggested Citation
    Geochemistry, Geophysics, Geosystems 17 (2016): 4354–4365
     

    Related items

    Showing items related by title, author, creator and subject.

    • Thumbnail

      Along-trench structural variations of the subducting Juan de Fuca Plate from multichannel seismic reflection imaging 

      Han, Shuoshuo; Carbotte, Suzanne M.; Canales, J. Pablo; Nedimovic, Mladen R.; Carton, Helene (John Wiley & Sons, 2018-04-22)
      To characterize the along‐strike structural variations of the Juan de Fuca (JdF) Plate as it enters the Cascadia subduction zone, we present prestack time migrated multichannel seismic reflection images of the JdF Plate ...
    • Thumbnail

      Constraints on melt content of off-axis magma lenses at the East Pacific Rise from analysis of 3-D seismic amplitude variation with angle of incidence 

      Aghaei, Omid; Nedimovic, Mladen R.; Marjanovic, Milena; Carbotte, Suzanne M.; Canales, J. Pablo; Carton, Helene; Nikić, Nikola (John Wiley & Sons, 2017-06-28)
      We use 3-D multichannel seismic data to form partial angle P wave stacks and apply amplitude variation with angle (AVA) crossplotting to assess melt content and melt distribution within two large midcrustal off-axis magma ...
    • Thumbnail

      Evolution of seismic layer 2B across the Juan de Fuca Ridge from hydrophone streamer 2-D traveltime tomography 

      Newman, Kori R.; Nedimovic, Mladen R.; Canales, J. Pablo; Carbotte, Suzanne M. (American Geophysical Union, 2011-05-17)
      How oceanic crust evolves has important implications for understanding both subduction earthquake hazards and energy and mass exchange between the Earth's interior and the oceans. Although considerable work has been done ...
    All Items in WHOAS are protected by original copyright, with all rights reserved, unless otherwise indicated. WHOAS also supports the use of the Creative Commons licenses for original content.
    A service of the MBLWHOI Library | About WHOAS
    Contact Us | Send Feedback | Privacy Policy
    Core Trust Logo