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Minor earthquake hits Yellowstone National Park

Sep 9, 2012 - The Associated Press

JACKSON -- A minor earthquake has rattled Yellowstone National Park.

An expert says the strength of the magnitude 3.7 earthquake that shook Yellowstone on Wednesday afternoon puts it in the "once-a-year" category for the area.

Robert Smith, a professor of geophysics at the University of Utah, says Yellowstone experiences about 3,000 earthquakes a year. Since 1962, there have been 49 earthquakes of magnitude 3 or greater within 16 miles of the epicenter of Wednesday's quake.

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