| 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. |
| Genre: | Article |
| ProdID: | 70017163 |
| Citation Author: | Vidale, J. E.; Benz, H. M. |
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| Citation End Page: | 683 |
| Citation Issue: | 6371 |
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| Citation Language: | English |
| Citation Larger Work Title: | Nature |
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| Citation Number Of Pages: | 6 |
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| Citation Search Results Text: | Upper-mantle seismic discontinuities and the thermal structure of subduction zones; 1992; Article; Journal; Nature; Vidale, J. E.; Benz, H. M. |
| Citation Start Page: | 678 |
| Citation Volume: | 356 |
| Citation Year: | 1992 |
| Type: | citation/reference |
| Text: | Upper-mantle seismic discontinuities and the thermal structure of subduction zones; 1992; Article; Journal; Nature; Vidale, J. E.; Benz, H. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1992 00:00 -0600 |
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