A Lack of Dynamic Triggering of Slow Slip and Tremor Indicates That the Shallow Cascadia Megathrust Offshore Vancouver Island Is Likely Locked

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  • Jeffrey J. McGuire
    Department of Geology and Geophysics Woods Hole Oceanographic Institution Woods Hole MA USA
  • John A. Collins
    Department of Geology and Geophysics Woods Hole Oceanographic Institution Woods Hole MA USA
  • Earl Davis
    Pacific Geoscience Centre Geological Survey of Canada Sidney British Columbia Canada
  • Keir Becker
    Department of Marine Geosciences University of Miami–RSMAS Miami FL USA
  • Martin Heesemann
    Ocean Networks Canada University of Victoria Victoria British Columbia Canada

書誌事項

公開日
2018-10-27
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#am
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2018gl079519
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>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 <jats:italic>M</jats:italic>7.6–8.1 earthquakes demonstrate a lack of triggered slow slip above the <jats:italic>M</jats:italic><jats:sub><jats:italic>w</jats:italic></jats:sub> 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.</jats:p>

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