Scientists are closely monitoring Yellowstone National Park following a cluster of some 250 tremors. While "swarms" of earthquakes in the vicinity are nothing new, that many are; scientists are wondering if it is a sign of something bigger on the way.
A geophysics expert says one quake measured 3.8 - an earthquake measuring 4 on the Richter scale is severe enough to cause moderate damage. Of the cluster that occurred Monday, one measured 3.3, but most were "barely detectable."
In 1959, a 7.8 earthquake in the region triggered landslides which killed 28 people.
© C Harris Lynn, 2008
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