Tuesday, December 30, 2008

Small quakes continue to rattle Yellowstone

The national park has quakes for a third straight day. Scientists don't know what to think about the unusual occurrence.

Reporting from Cheyenne, Wyo. -- Yellowstone National Park was jostled by small earthquakes for a third straight day Monday, and scientists watched closely to see whether the more than 250 tremors were a sign of something bigger.

Swarms of small earthquakes happen frequently in Yellowstone, but it is unusual for so many quakes to happen over several days, said Robert Smith, a professor of geophysics at the University of Utah.

"They're certainly not normal," Smith said. "We haven't had earthquakes in this energy or extent in many years."

Smith directs the Yellowstone Seismic Network, which operates seismic stations around the park.

He said the quakes ranged in strength from barely detectable to one of magnitude 3.8 on Saturday. A magnitude-4 quake is capable of producing moderate damage.

Read full story Los Angeles Times

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