Figure F9. Seismicity in the northern Cascadia region. A. Epicenters of earthquakes in the oceanic crust shown as black open circles and in the continental crust as blue open circles (undifferentiated by magnitude). Large historical continental earthquakes (Mw ~7) are shown by red stars. B. Epicenters of tremor associated with periodic slip occurring roughly every 14 months documented along and above the subduction plate interface, shown as red open circles (from Kao et al., 2009). ETS = episodic tremor and slip.
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