The Utah Supervolcano
December 15, 2013 | Brigham Young University
"Brigham Young University geologists found evidence of some of the largest volcanic eruptions in earth’s history right in their own backyard. These supervolcanoes aren’t active today, but 30 million years ago more than 5,500 cubic kilometers of magma erupted during a one-week period near a place called Wah Wah Springs." Quoted from the Brigham Young University press release.
Related: Volcanic Explosivity Index
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Explosive Magma Can Lurk for 100000 Years
September 12, 2013 | University of Washington
"Reservoirs of silica-rich magma -- the kind that causes the most explosive volcanic eruptions -- can persist in the Earth's upper crust for hundreds of thousands of years without triggering an eruption, according to new University of Washington research."