Saturday, April 23, 2005
Yellowstone volcano active or not?
Yellowstone National Park contains the world's largest active volcano, with a caldera 50 miles long by 30 miles wide.
The Yellowstone volcano experienced huge supereruptions 2.1 million years ago, 1.3 million years ago, and 640,000 year ago. It also has had about 80 relatively minor eruptions with lava flows, the most recent about 70,000 years ago.
WILL IT BLOW AGAIN:
Some theorize that the last three supereruption intervals indicate the volcano is primed to blow again soon. But geologists say three supereruptions are too few to draw any conclusion. Scientists say that despite close monitoring, there is no evidence that either a catastrophic eruption or a smaller lava eruption at Yellowstone is in the works any time soon.