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.

Additional publication details

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