The Cascadia Subduction Zone (CSZ) may be unique among the world's subduction zones in that it produces very few earthquakes precisely on the zone boundary. Based on evidence of past great megathrust earthquakes, the CSZ must be much more strongly locked than other subduction zones. It's not clear whether the entire CSZ always ruptures in great Magnitude 9 (M9) earthquakes, or whether smaller M8 or M8.5-sized events also can break parts of the zone in between the full rupture events. Great! Just great!
http://pnsn.org/outreach/earthquakesources/csz
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