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The limits of Cascadia were first defined to contain nearly the entire margin of the Pacific Northwest, from Cape Mendocino through the Alaska Panhandle [Schuchert, 1910; Schuchert and Barrell, 1914]. Since that time, the boundary of Cascadia has shrunk to become essentially synonymous with the region where the Juan de Fuca plate subducts beneath the North American plate. As a consequence, seismic hazard assessments in the Pacific Northwest have conventionally focused on the potential for large megathrust earthquakes along the interface of the Juan de Fuca and North American plates.
Szeliga, W. (2013). 2012 Haida Gwaii Quake: Insight Into Cascadia’s Subduction Extent. Eos, Transactions American Geophysical Union, 94(9), 85–86. https://doi.org/10.1002/2013eo090001
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