Volcano Watch” is a weekly article and Big Island volcanic activity update written by U.S. Geological Survey Hawaiian Volcano ...

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

"What makes the event even more extraordinary is that it did not involve a single volcano, but multiple active sources." ...

Learn more about the past eruptions at Yellowstone National Park and how each new eruption displaced evidence of the past.