The deadliest volcano in the continental US

MSH82 st helens plume from harrys ridge 05-19-82.jpg

Plumes of steam, gas, and ash often occurred at Mount St. Helens in the early 1980s. On clear days they could be seen from Portland, Oregon, 50 mi (80 km) to the south. The plume photographed here rose nearly 3,000 ft (910 m) above the volcano’s rim. The view is from Harrys Ridge, 5 mi (8 km) north of the mountain. (Image:

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New information on Yellowstone Super-Volcano

AUG. 15, 1997 FILE PHOTO

An unidentified pair of visitors to Yellowstone National Park in 1997 photograph the Old Faithful geyser as it rockets 100-feet skyward in Wyoming.    Kevork Djansezian/AP

Molten rock beneath Yellowstone National Park much larger than previously believed, study finds.

The park’s super-volcano has the potential to erupt with a force about 2,000 times the size of Mount St. Helens, according to the study. The last Yellowstone eruption happened 640,000 years ago, according to the U.S. Geological Survey.

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