Seismic Evidence for Water Deep in Earth's Upper Mantle

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Science  06 Jun 2003:
Vol. 300, Issue 5625, pp. 1556-1558
DOI: 10.1126/science.1083636

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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.

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