Intraslab earthquakes: dehydration of the Cascadia slab |
| |
| Authors: | Preston Leiph A Creager Kenneth C Crosson Robert S Brocher Thomas M Trehu Anne M |
| |
| Institution: | Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, USA. preston@ess.washington.edu |
| |
| 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 intraslab earthquakes into two groups, permitting a new understanding of the origins of intraslab 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. |
| |
| Keywords: | |
| 本文献已被 PubMed 等数据库收录！ |
|
