
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