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  • Title: A detailed map of the 660-kilometer discontinuity beneath the izu-bonin subduction zone.
    Author: Wicks CW, Richards MA.
    Journal: Science; 1993 Sep 10; 261(5127):1424-7. PubMed ID: 17745352.
    Abstract:
    Dynamical processes in the Earth's mantle, such as cold downwelling at subduction zones, cause deformations of the solid-state phase change that produces a seismic discontinuity near a depth of 660 kilometers. Observations of short-period, shear-to-compressional wave conversions produced at the discontinuity yield a detailed map of deformation beneath the Izu-Bonin subduction zone. The discontinuity is depressed by about 60 kilometers beneath the coldest part of the subducted slab, with a deformation profile consistent with the expected thermal signature of the slab, the experimentally determined Clapeyron slope of the phase transition, and the regional tectonic history.
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