Yellowstone Volcano Rising At Record Rate 

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9 November 07
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Yellowstone Volcano Rising At Record Rate
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9 Nov 07 — The Yellowstone "supervolcano" has risen at a record rate since mid-2004, apparently because a blob of molten rock the size of Los Angeles has injected itself 6 miles beneath the caldera, says a new report in the journal Science.

"The upward movement of the Yellowstone caldera floor - almost 3 inches (7 cm) per year for the past three years -- is more than three times greater than ever observed since such measurements began in 1923, says the study in the Nov. 9 issue of Science.

"There is no evidence of an imminent volcanic eruption or hydrothermal explosion." says seismologist Robert B. Smith, lead author of the study and professor of geophysics at the University of Utah. "A lot of calderas [giant volcanic craters] worldwide go up and down over decades without erupting."

Yellowstone produced huge eruptions 2 million, 1.3 million and 642,000 years ago. These eruptions were 2,500, 280 and 1,000 times bigger, respectively, than the 1980 eruption of Mount St. Helens. The eruptions covered as much as half the continental United States with inches to feet of volcanic ash.

Many smaller volcanic eruptions have occurred at Yellowstone, most recently 70,000 years ago. Smaller steam and hot water explosions have been more frequent and more recent.

"The uplift is still going on today but at a little slower rate," says Smith, adding there is no way to know when it will stop.

Yellowstone sprawls across parts of Wyoming, Montana and Idaho.

See entire article:
http://www.sciencedaily.com/releases/2007/11/071108141612.htm
Thanks to Jimmy Walter and Peter Pesola for this link.
 

For more background on Yellowstone, see also:

http://www.iceagenow.com/Supervolcano.htm

http://www.iceagenow.com/Yellowstone_Slumbering_Giant.htm

It's interesting to note that the last major eruption of Yellowstone
some 640,000 years ago coincided with a geomagnetic reversa
l.


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