Contours showing the depth of the top of the subducted Juna de Fuca plate.

Depth to the Juan de Fuca Slab Beneath the Cascadia Subduction Margin—A 3-D Model for Sorting Earthquakes, Patricia A. McCrory, J. Luke Blair, David H. Oppenheimer, and Stephen R. Walter U.S. Geological Survey, Menlo Park, California.  From:  http://pubs.usgs.gov/ds/91/2_TEXT.pdf 

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