Could it happen here! It did not so long ago in geologic time!
Tue, 12 Apr 2011 11:41:00 -0500
University of Utah geophysicists made the first large-scale picture of the electrical conductivity of the gigantic underground plume of hot and partly molten rock that feeds the Yellowstone super volcano. The image suggests the plume is even bigger than it appears in earlier images made with earthquake waves.
Full story at http://www.unews.utah.edu/p/?r=032411-5