03/20/2010 05:12 am ET | Updated May 25, 2011

Swarm of earthquakes hit Yellowstone

YELLOWSTONE NATIONAL PARK, Wyo. - A moderate swarm of earthquakes is rattling Yellowstone National Park in what researchers at the University of Utah say is a common event. Jamie Farrell is a doctoral student with the university in Salt Lake City. He says that the earthquake swarm started Sunday night

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