The Cascadia subduction zone (CSZ), where the Juan de Fuca and Gorda plates subduct obliquely beneath North America at a rate of about 35 millimeters per year, poses major geological hazards to population centers of the northwestern United States. Despite the importance of the subducting slab in these hazards, the plate boundary is poorly mapped and understood, especially offshore.
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Holbrook, W. Steven; Kent, Graham; Keranan, Katie; Johnson, H. Paul; Trehu, Anne; Tobin, Harold; Caplan-Auerbach, Jacqueline; and Beeson, Jeff, "Cascadia Fore Arc Seismic Survey: Open-Access Data Available" (2012). Geology. Paper 40.