Intraslab earthquakes: dehydration of the Cascadia slab
Preston LA, Creager KC, Crosson RS, Brocher TM, Trehu AM. 2003. Intraslab earthquakes: dehydration of the Cascadia slab. Science. 302(5648):1197-1200
From the 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."
- Type
- Journal Article
- Authors
- Preston, Leiph; Creager, Kenneth; Crosson, Robert; Brocher, Thomas; Trehu, Anne
- Units
- OLYM
- Keywords
- Cascadia subduction zone, Earthquake, Geology