http://gallery.usgs.gov/videos/114 (for accessible version)
USGS Scientist-in-Charge of Yellowstone Volcano Observatory, Jake Lowenstern, answers
the following questions to explain volcanic eruptions at Yellowstone: When was the last supereruption at Yellowstone?", "Have any eruptions occurred since the last supereruption?", "Is Yellowstone overdue for an eruption?", "What does the magma below indicate about a possible eruption?", "What else is possible?", and "Why didn't you think the Yellowstone Lake earthquake swarm would lead to an
eruption?"
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