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California quake swarm isn't all that rare
A "swarm" of earthquakes that touched off Sunday morning in southern California was still rolling along Monday afternoon, registering more than 300 small to moderate quakes that could be felt from Arizona to San Diego. The swarm is unusual but not as rare as you might think.
Source: NBCnews
Posted on:
Tuesday, Aug 28, 2012, 7:31am
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