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Minor earthquake hits Yellowstone National Park

Published: Friday, Sept. 7 2012 2:27 p.m. MDT

JACKSON, Wyo. (AP) — 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.

The Jackson Hole News & Guide reports that 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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