Wednesday, March 16, 2011

Earthquake Swarms

Could happen in Oregon

According to studies there is an 8.5 quake offshore roughly every 500 years.


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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