Yellowstone Sits on 'Supervolcano'
Underground volcanic material spans larger area than previously believed
By Matt Cantor,  Newser User
Posted Apr 14, 2011 3:45 PM CDT
Visitors to Yellowstone National Park photograph the Old Faithful geyser as it rockets 100-feet skyward.   (AP Photo/Kevork Djansezian)
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(Newser) – The volcanic plume that powers Yellowstone’s geysers and hot springs may be bigger than we thought, and it could someday erupt—not for the first time. The “hotspot” unleashed three major blasts long ago, covering a huge portion of the continent with ash, the BBC reports. Researchers made their discoveries by studying changes in the electrical conductivity of the area’s molten rocks and hot water, marking a shift from a 2009 study that examined seismic waves. Click through for more on the Yellowstone findings.