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Upper-mantle seismic discontinuities and the thermal structure of subduction zones

Nature

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Abstract

The precise depths at which seismic velocities change abruptly in the upper mantle are revealed by the analysis of data from hundreds of seismometers across the western United States. The boundary near 410 km depth is locally elevated, that near 660 km depressed. The depths of these boundaries, which mark phase transitions, provide an in situ thermometer in subduction zones: the observed temperature contrasts require at least moderate thickening of the subducting slab near 660 km depth. In addition, a reflector near 210 km depth may mark the bottom of the aesthenosphere.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Upper-mantle seismic discontinuities and the thermal structure of subduction zones
Series title:
Nature
Volume
356
Issue:
6371
Year Published:
1992
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Nature
First page:
678
Last page:
683