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Science 15 November 2002:
Vol. 298. no. 5597, pp. 1407 - 1410
DOI: 10.1126/science.1075390
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Reports

Simulation of Subduction Zone Seismicity by Dehydration of Serpentine

David P. Dobson,12* Philip G. Meredith,2 Stephen A. Boon2

We measured acoustic emission energy during antigorite dehydration in a multianvil press from 1.5 to 8.5 gigapascals and 300° to 900°C. There was a strong acoustic emission signal on dehydration, and analysis of recovered samples revealed brittle deformation features associated with high pore-fluid pressures. These results demonstrate that intermediate depth (50 to 200 kilometers) seismicity can be generated by dehydration reactions in the subducting slab.

1 Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany.
2 Department of Earth Sciences, University College London WC1E 6BT, UK.
*   To whom correspondence should be addressed. E-mail: d.dobson{at}ucl.ac.uk

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Bulletin of the Seismological Society of America 96, 1029-1037
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Reviews in Mineralogy and Geochemistry 62, 29-52
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Lizardite-chlorite structural relationships and an inferred high-pressure lizardite polytype.
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American Mineralogist 89, 1631-1639
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Composition of fluids during serpentinite breakdown in subduction zones: Evidence for limited boron mobility.
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High-resolution subducting-slab structure beneath northern Honshu, Japan, revealed by double-difference tomography.
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Geology 32, 361-364
Reaction-enhanced permeability during serpentinite dehydration.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)