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Intrastab Earthquakes: Dehydration of the Cascadia Slab

Science

By:
, , , ,
DOI: 10.1126/science.1090751

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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
Number of Pages:
4