Upper mantle structure from teleseismic P wave arrivals in Washington and northern Oregon ( USA).
Journal of Geophysical Research
By: C. A. Michaelson and C. S. Weaver
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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
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Upper mantle structure from teleseismic P wave arrivals in Washington and northern Oregon ( USA). |
| Series title | Journal of Geophysical Research |
| Volume | 91 |
| Issue | B2 |
| Year Published | 1986 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Geophysical Research |
| First page | 2077 |
| Last page | 2094 |
| Google Analytic Metrics | Metrics page |