Yellowstone Supervolcano Eruption Dangers

On September 27, 2014 Mt Ontake, about 130 miles west of Tokyo, erupted without warning, catching volcanologists and hikers by surprise, killing 57 people. Yellowstone National Park lies on top of a magma chamber that is 35-miles wide and 55-miles long. The supervolcano is active and in danger of eruption.