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YELLOWSTONE NATIONAL PARK, Wyo. (AP) -- Sixteen small earthquakes with magnitudes up to 2.7 shook the park's Pitchstone Plateau last week.
The quakes were detected by seismographs at the University of Utah and partners.
Bob Smith, a Univeristy of Utah professor, says the quakes began Monday, just before midnight. The largest occurred at 3:09 a.m. Tuesday and the quakes continued until Wednesda
The quakes occurred on the southern edge of a volcano caldera at the center of Yellowstone. The volcano last erupted 70,000 years ago.
Smith says earthquake swarms are common in Yellowstone. As many as 70 swarms of small earthquakes have occurred in the region between 1983 and 2006.
Information from: Jackson Hole News & Guide
(Copyright 2007 by The Associated Press. All Rights Reserved.)