The Cascadia Subduction Zone is a 600 mile-long converging plate boundary stretching from northern California to southern British Columbia. The fault causes a major earthquake about once every 300 years. Compared to other fault lines, this is an unusually long return time – resulting in greater stress build-up and stronger subsequent earthquakes. The last major event (a so-called megathrust quake) took place in 1700 and was estimated to have had a magnitude of at least 9.0.
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