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Swarm of Yellowstone Quakes Baffles Scientists

Mead Gruver, Discovery News

He said Yellowstone remains very geologically active -- and its famous geysers and hot springs are a reminder that a pool of magma still exists five to 10 miles underground.

"That's just the surface manifestation of the enormous amount of heat that's being released through the system," he said.

Yellowstone has had significant earthquakes as well as minor ones in recent decades. In 1959, a magnitude 7.5 quake near Hebgen Lake just west of the park triggered a landslide that killed 28 people.

Related Links:

What's Under Yellowstone?

HowStuffWorks.com: Exploring Yellowstone National Park

Treehugger.com: "Supervolcano" Pushing Yellowstone Ever Upwards