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Changing impacts of Alaska-Aleutian subduction zone tsunamis in California under future sea-level rise

Author

Listed:
  • Tina Dura

    (Department of Geosciences, Virginia Tech
    Center for Coastal Studies, Virginia Tech)

  • Andra J. Garner

    (Rowan University)

  • Robert Weiss

    (Department of Geosciences, Virginia Tech
    Center for Coastal Studies, Virginia Tech)

  • Robert E. Kopp

    (Rutgers University
    Institute of Earth, Ocean, and Atmospheric Sciences, Rutgers University)

  • Simon E. Engelhart

    (Durham University, Lower Mountjoy)

  • Robert C. Witter

    (U.S. Geological Survey, Alaska Science Center)

  • Richard W. Briggs

    (U.S. Geological Survey, Geologic Hazards Science Center)

  • Charles S. Mueller

    (U.S. Geological Survey, Geologic Hazards Science Center)

  • Alan R. Nelson

    (U.S. Geological Survey, Geologic Hazards Science Center)

  • Benjamin P. Horton

    (Earth Observatory of Singapore, Nanyang Technological University
    Asian School of the Environment, Nanyang Technological University)

Abstract

The amplification of coastal hazards such as distant-source tsunamis under future relative sea-level rise (RSLR) is poorly constrained. In southern California, the Alaska-Aleutian subduction zone has been identified as an earthquake source region of particular concern for a worst-case scenario distant-source tsunami. Here, we explore how RSLR over the next century will influence future maximum nearshore tsunami heights (MNTH) at the Ports of Los Angeles and Long Beach. Earthquake and tsunami modeling combined with local probabilistic RSLR projections show the increased potential for more frequent, relatively low magnitude earthquakes to produce distant-source tsunamis that exceed historically observed MNTH. By 2100, under RSLR projections for a high-emissions representative concentration pathway (RCP8.5), the earthquake magnitude required to produce >1 m MNTH falls from ~Mw9.1 (required today) to Mw8.0, a magnitude that is ~6.7 times more frequent along the Alaska-Aleutian subduction zone.

Suggested Citation

  • Tina Dura & Andra J. Garner & Robert Weiss & Robert E. Kopp & Simon E. Engelhart & Robert C. Witter & Richard W. Briggs & Charles S. Mueller & Alan R. Nelson & Benjamin P. Horton, 2021. "Changing impacts of Alaska-Aleutian subduction zone tsunamis in California under future sea-level rise," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-27445-8
    DOI: 10.1038/s41467-021-27445-8
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    References listed on IDEAS

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