Unprecedented Activity at Yellowstone

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19 Mar 07

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Unprecedented activity at Yellowstone

15 Mar 07 – Supervolcanoes can sleep for centuries or millennia before producing incredibly massive eruptions that can drop ash across an entire continent. One of the largest supervolcanoes in the world lies beneath Yellowstone National Park, spanning parts of Wyoming, Montana and Idaho.

Scientists don't think it will erupt any time soon, yet "significant activity continues beneath the surface."

"The activity has been increasing lately."

"The findings, reported this month in the Journal of Geophysical Research/Solid Earth, show that the 45-by-30-mile caldera bulged and deflated significantly during the study period, resulting in a series of small earthquakes that produced 10 times more energy than would occur if the ground were to move suddenly in a large eruption."

The caldera floor sank 4.4 inches from 1987 until 1995. From 1995 until 2000, the northwest rim of the caldera rose about 3 inches, followed by another 1.4-inch rise until 2003. Between 2000 and 2003, the caldera floor sank a little more than an inch. And from 2004 to 2006 the central caldera floor rose faster than ever, springing up nearly 7 inches during the three-year span.

"The rate is unprecedented, at least in terms of what scientists have been able to observe in Yellowstone," the article said.

The article goes on to explain that the valley where Jackson Hole is located is rising, and that the Grand Tetons are growing shorter.

If Yellowstone should erupt, we’d be in a full-fledged ice-age within months, if not weeks.

See full article By Sara Goudarzi
http://www.foxnews.com/story/0,2933,258732,00.html
Thanks to Lonn Bailey for this link
 



               

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