January 20, 2010
The Denver Post
A 3.5-magnitude earthquake hit Yellowstone National Park on Tuesday afternoon as a swarm of earthquakes that started Sunday intensified.
The earthquake occurred at 2:32 p.m., according to scientists.
A woman at the West Yellowstone Montana Chamber of Commerce said the earthquake created a "rumble like a truck driving down the road."
Al Nash, spokesman for Yellowstone National Park, said that 469 earthquakes since Sunday had been recorded as of 3 p.m. Tuesday.
So far, scientists monitoring the swarm say the tremors seem to be normal tectonic activity. However, they continue to keep an eye on the situation.
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