Intrastab Earthquakes: Dehydration of the Cascadia Slab
Science
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Abstract
We simultaneously invert travel times of refracted and wide-angle reflected waves for three-dimensional compressional-wave velocity structure, earthquake locations, and reflector geometry in northwest Washington state. The reflector, interpreted to be the crust-mantle boundary (Moho) of the subducting Juan de Fuca plate, separates intrastab earthquakes into two groups, permitting a new understanding of the origins of intrastab earthquakes in Cascadia. Earthquakes up-dip of the Moho's 45-kilometer depth contour occur below the reflector, in the subducted oceanic mantle, consistent with serpentinite dehydration; earthquakes located down-dip occur primarily within the subducted crust, consistent with the basalt-to-eclogite transformation.
Suggested Citation
Preston, L., Creager, K.C., Crosson, R.S., Brocher, T., and Trehu, A., 2003, Intrastab Earthquakes: Dehydration of the Cascadia Slab: Science, v. 302, no. 5648, p. 1197-1200, https://doi.org/10.1126/science.1090751.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Intrastab Earthquakes: Dehydration of the Cascadia Slab |
| Series title | Science |
| DOI | 10.1126/science.1090751 |
| Volume | 302 |
| Issue | 5648 |
| Year Published | 2003 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Science |
| First page | 1197 |
| Last page | 1200 |