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