| Abstract: | Teleseismic P wave travel time residuals are used to detect lateral velocity heterogeneities in the upper mantle beneath Washington and N Oregon. The results of an inversion for 3-D velocity variations resolves an E dipping high-velocity zone that we interpret as the subducting Juan de Fuca plate. The plate is characterized by 3-8% higher velocities than those in the surrounding upper mantle. Inversion of the travel time data and ray trace modeling indicate that the plate extends to a depth of 200- 300 km. Based on changes in the geometry and velocity structure of the subducted Juan de Fuca plate 6 of about 123oW, we propose that the subducted slab is segmented into 3 sections beneath Washington and N Oregon. -from Authors |
| Genre: | Article |
| ProdID: | 70014694 |
| Citation Author: | Michaelson, C. A.; Weaver, C. S. |
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| Citation End Page: | 2094 |
| Citation Issue: | B2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Geophysical Research |
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| Citation Number Of Pages: | 18 |
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| Citation Search Results Text: | Upper mantle structure from teleseismic P wave arrivals in Washington and northern Oregon ( USA).; 1986; Article; Journal; Journal of Geophysical Research; Michaelson, C. A.; Weaver, C. S. |
| Citation Start Page: | 2077 |
| Citation Volume: | 91 |
| Citation Year: | 1986 |
| Type: | citation/reference |
| Text: | Upper mantle structure from teleseismic P wave arrivals in Washington and northern Oregon ( USA).; 1986; Article; Journal; Journal of Geophysical Research; Michaelson, C. A.; Weaver, C. S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1986 00:00 -0600 |
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