Supervalcano In Yellowstone Park

[Stuart G]

If this erupts, it will make the volcano in Iceland look like a firecracker.


http://www.solcomhouse.com/yellowstone.htm

anothr link...Widipedia..

http://en.wikipedia.org/wiki/Yellowstone_Caldera

Volcano Observation at Yellowstone.
The Yellowstone Volcano Observatory (YVO) was created as a partnership among the U.S. Geological Survey (USGS), Yellowstone National Park, and University of Utah to strengthen the long-term monitoring of volcanic and earthquake unrest in the Yellowstone National Park region

http://volcanoes.usgs.gov/yvo/



Eruptions of the Yellowstone volcanic system have included the two largest volcanic eruptions in North America in the past few million years; the third largest was at Long Valley in California and produced the Bishop ash bed. The biggest of the Yellowstone eruptions occurred 2.1 million years ago, depositing the Huckleberry Ridge ash bed. These eruptions left behind huge volcanic depressions called “calderas” and spread volcanic ash over large parts of North America (see map). If another large caldera-forming eruption were to occur at Yellowstone, its effects would be worldwide. Thick ash deposits would bury vast areas of the United States, and injection of huge volumes of volcanic gases into the atmosphere could drastically affect global climate.