Yellowstone Has Bulged as Magma Pocket Swells

Friday, January 21, 2011
By Paul Martin

Yellowstone Has Bulged as Magma Pocket Swells

Brian Handwerk
National Geographic News
January 19, 2011

Yellowstone National Park’s supervolcano just took a deep “breath,” causing miles of ground to rise dramatically, scientists report.

The simmering volcano has produced major eruptions—each a thousand times more powerful than Mount St. Helens’s 1980 eruption—three times in the past 2.1 million years. Yellowstone’s caldera, which covers a 25- by 37-mile (40- by 60-kilometer) swath of Wyoming, is an ancient crater formed after the last big blast, some 640,000 years ago.

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