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Seismic evidence for overpressured subducted oceanic crust and megathrust fault sealing

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  • Pascal Audet

    (University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
    Present address: Seismological Laboratory, University of California Berkeley, 215 McCone Hall, Berkeley, California 94720, USA.)

  • Michael G. Bostock

    (University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada)

  • Nikolas I. Christensen

    (University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
    University of Wisconsin-Madison, 1215 West Dayton Street, Madison, Wisconsin 53706, USA)

  • Simon M. Peacock

    (University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada)

Abstract

Water at a subduction zone Water and hydrous minerals play a key role in geodynamic processes at subduction zones, however there are few seismological constraints on the presence of water within the subducting plate. Audet et al. model converted teleseismic waves to constrain the seismological properties of subducted oceanic crust from the Cascadia continental margin to its intersection with the forearc mantle. Their observations suggest that water is pervasively present in fluid form at high pore pressures, indicating that the megathrust is a low-permeability boundary. These results may hold important implications for our understanding of seismogenesis, subduction-zone structure and the mechanism of episodic tremor and slip.

Suggested Citation

  • Pascal Audet & Michael G. Bostock & Nikolas I. Christensen & Simon M. Peacock, 2009. "Seismic evidence for overpressured subducted oceanic crust and megathrust fault sealing," Nature, Nature, vol. 457(7225), pages 76-78, January.
    • Handle: RePEc:nat:nature:v:457:y:2009:i:7225:d:10.1038_nature07650
    DOI: 10.1038/nature07650
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    Cited by:

    1. Lu Yao & Shengli Ma & Giulio Di Toro, 2023. "Coseismic fault sealing and fluid pressurization during earthquakes," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Xin Wang & Ling Chen & Kelin Wang & Qi-Fu Chen & Zhongwen Zhan & Jianfeng Yang, 2024. "Seismic evidence for melt-rich lithosphere-asthenosphere boundary beneath young slab at Cascadia," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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