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Science 6 June 2003:
Vol. 300. no. 5625, pp. 1556 - 1558
DOI: 10.1126/science.1083636
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Reports

Seismic Evidence for Water Deep in Earth's Upper Mantle

Mark van der Meijde,* Federica Marone, Domenico Giardini, Suzan van der Lee

Water in the deep upper mantle can influence the properties of seismic discontinuities in the mantle transition zone. Observations of converted seismic waves provide evidence of a 20- to 35-kilometer-thick discontinuity near a depth of 410 kilometers, most likely explained by as much as 700 parts per million of water by weight.

Institute of Geophysics, Eidgenössische Technische Hochschule–Hönggerberg (HPP)/Swiss Federal Institute of Technology CH–8093 Zürich, Switzerland.

* To whom correspondence should be addressed. E-mail: mark{at}tomo.ig.erdw.ethz.ch

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