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pkg simon orig earthquake swarm_00010830.jpg
pkg simon orig earthquake swarm_00010830.jpg

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    Earthquake swarms sign of the big one?

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Earthquake swarms sign of the big one?

Parts of the Northwest are experiencing earthquake swarms. CNN's Dan Simon explains what the are, and what they mean.

Earthquake swarms sign of the big one?

Parts of the Northwest are experiencing earthquake swarms. CNN's Dan Simon explains what the are, and what they mean.