Seismic evidence for overpressured subducted oceanic crust and megathrust fault sealing

Pascal Audet (), Michael G. Bostock, Nikolas I. Christensen and Simon M. Peacock
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Pascal Audet: University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
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
Simon M. Peacock: University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada

Nature, 2009, vol. 457, issue 7225, 76-78

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.

Date: 2009
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DOI: 10.1038/nature07650

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