• Login
    About WHOAS
    View Item 
    •   WHOAS Home
    • Woods Hole Oceanographic Institution
    • Geology and Geophysics (G&G)
    • View Item
    •   WHOAS Home
    • Woods Hole Oceanographic Institution
    • Geology and Geophysics (G&G)
    • 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

    A lack of dynamic triggering of slow slip and tremor indicates that the shallow Cascadia megathrust offshore Vancouver Island is likely locked

    Thumbnail
    View/Open
    Article (2.829Mb)
    Supporting Information S1 (978.9Kb)
    Date
    2018-10-27
    Author
    McGuire, Jeffrey J.  Concept link
    Collins, John A.  Concept link
    Davis, Earl  Concept link
    Becker, Keir  Concept link
    Heesemann, Martin  Concept link
    Metadata
    Show full item record
    Citable URI
    https://hdl.handle.net/1912/10790
    As published
    https://doi.org/10.1029/2018GL079519
    DOI
    10.1029/2018GL079519
    Keyword
     Cascadia subduction zone; Seafloor geodesy; Seismic tremor 
    Abstract
    Great subduction zone earthquakes vary considerably in the updip extent of megathrust rupture. It is unclear if this diversity reflects variations in interseismic strain accumulation owing to the limited number of subduction zones with seafloor monitoring. We use a borehole seismic‐geodetic observatory installed at the updip end of the Cascadia fault offshore Vancouver Island to show that the megathrust there does not appear to slip in triggered tremor or slow‐slip events when subjected to moderate dynamic stress transients. Borehole tilt and seismic data from recent teleseismic M7.6–8.1 earthquakes demonstrate a lack of triggered slow slip above the Mw 4.0 level and an absence of triggered tremor despite shear‐stress transients of 1–10 kPa that were sufficient to trigger tremor on the downdip end of the interface. Our observations are most consistent with a model in which the Cascadia fault offshore Vancouver Island is locked all the way to the trench.
    Description
    Author Posting. © American Geophysical Union, 2018. 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 45 (2018): 11,095-11,103, doi:10.1029/2018GL079519.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Geophysical Research Letters 45 (2018): 11,095-11,103
     

    Related items

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

    • Thumbnail

      A 2-D tomographic model of the Juan de Fuca plate from accretion at axial seamount to subduction at the Cascadia margin from an active source ocean bottom seismometer survey 

      Horning, Gregory W.; Canales, J. Pablo; Carbotte, Suzanne M.; Han, Shuoshuo; Carton, Helene; Nedimovic, Mladen R.; van Keken, Peter E. (John Wiley & Sons, 2016-08-14)
      We report results from a wide-angle controlled source seismic experiment across the Juan de Fuca plate designed to investigate the evolution of the plate from accretion at the Juan de Fuca ridge to subduction at the Cascadia ...
    • Thumbnail

      Vp/Vs ratio of incoming sediments off Cascadia subduction zone from analysis of controlled-source multicomponent OBS records 

      Zhu, Jian; Canales, J. Pablo; Han, Shuoshuo; Carbotte, Suzanne M.; Arnulf, Adrien F.; Nedimovic, Mladen R. (American Geophysical Union, 2020-05-28)
      P‐to‐S‐converted waves observed in controlled‐source multicomponent ocean bottom seismometer (OBS) records were used to derive the Vp/Vs structure of Cascadia Basin sediments. We used P‐to‐S waves converted at the basement ...
    • Thumbnail

      The CAFE Experiment : a joint seismic and MT investigation of the Cascadia Subduction System 

      McGary, R Shane (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2013-02)
      In this thesis we present results from inversion of data using dense arrays of collocated seismic and magnetotelluric stations located in the Cascadia subduction zone region of central Washington. In the migrated seismic ...
    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