The Yellowstone valcano eruptes roughly every 600,000 years. (The last eruption being 640,000 years ago, so it's overdue!) The estimates are that the next one would be 2,500 times the size of Mt St Helens eruption in 1980! If Yellowstone blows like it did 2.1 million years ago, it could deposit 600 cubic miles of stuff on America (compared to the 0.24 cubic miles St Helens put out.). That would bury most of America meters deep and kill around two-thirds of population.
The Kileaua valcano in Hawii is the worlds most active volcano. The first well-documented eruption of Kileaua occurred in 1823. Since that time the volcano has erupted repeatedly. Kileaua's eruption dates back to January 3, 1983, and is by far it's longest lived historical period of it activity, as well as one of the longest lived eruptions in the world; as of January 2011. The eruption has produced 3.5 cubic Kilometers (0.84 cu miles ) of lava and resurfaced 123.2 km2(48 sq mi
) of land.
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