A gigantic bulge in the north rim of the Yellowstone caldera is the latest sign of volcanic activity in the national park.

Far beneath the forests and hot springs of the American West, the continent’s largest active volcanic system is rumbling in ways scientists are only now beginning to fully resolve. New seismic ...

(via PBS Terra) Yellowstone was massive. Roughly a thousand times larger than the eruption of Mt. St. Helens, the biggest eruption in the history of the continental United States. And if Yellowstone ...