The Cascadia subduction zone, where the Juan de Fuca (JdF) plate subducts beneath North America, has paleoseismic evidence of Mw∼9.0 megathrust earthquakes (Nelson et al., 1995; Goldfinger et al., 2003). However, there are virtually no instrumentally recorded thrust‐zone earthquakes, hence the location and behavior of the seismogenic zone is known only indirectly. Temperature has been proposed to control seismogenesis with depth, assuming that the locked zone extends from the trench or the 150°C isotherm down‐dip to the 350°C isotherm, with a transition zone extending to 450°C (Hyndman and Wang, 1993; Oleskevich...
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