PlaceofDis said:
just out of curiosity.....which valcano is the largest? i know St Helens is up there, but is that the largest we have or is there another bigger one?
The biggest volcano in the US is Yellowstone.
http://volcanoes.usgs.gov/yvo/faqs.html
If it blows, we're screwed.
"The three caldera-forming eruptions, respectively, were about 2,500, 280, and 1,000 times larger than the May 18, 1980 eruption of Mt. St. Helens in Washington State."
"the three largest Yellowstone eruptions emitted much more material than the eruptions of Mount St. Helens (1980), Mount Pinatubo (1991), Krakatau (1883), Mount Mazama (7,600 years ago), and Tambora (1815)."
"Three extremely large explosive eruptions have occurred at Yellowstone in the past 2.1 million years with a recurrence interval of about 600,000 to 800,000 years"
The last one was 640,000 years ago...