Could happen in Oregon
According to studies there is an 8.5 quake offshore roughly every 500 years.
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Seismic Cluster Strikes Offshore Oregon
Posted by feww on May 8, 2010
Larger Shocks May Occur
Cluster of at least 9 shocks strike offshore Oregon
Earthquake measuring about 5.4Mw struck the offshore Oregon about 500km west of Eugene on Friday, May 07, 2010 at 17:46:15UTC.
Epicenter of the earthquake was located near 44.396°N, 129.437°W and occurred at a depth of 10 km (6.2 miles). The initial shock was followed by at least 8 other events [aftershocks] measuring a mean magnitude of about 4.4Mw.
Center of the cluster was about 1,000km (600 miles) south of a magnitude 8.1 shock that occurred on the Queen Charlotte Fault off Queen Charlotte Island on August 22, 1949. That event was Canada’s largest earthquake since 1700.
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