The Cascadia subduction zone offshore Oregon and Washington has been anomalously quiet since the advent of modern seismic networks in the Pacific Northwest. Nonetheless, during the 26 year period from 1989 through 2014, 19 earthquakes with M≥2.8 were detected by seismic networks and located on the continental margin of central Oregon (44.3°–44.7° N) in the region where the Juan de Fuca and North American plates are thought to be locked (e.g., McCaffrey et al., 2007; Burgette et al., 2009; Schmalzle et al., 2014). With increasing evidence that plate boundary earthquakes may undergo a...
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