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

The volcanic system beneath Yellowstone National Park is one of the few places on Earth capable of an eruption so large it ...

Scientists are monitoring a city of Chicago-sized swath of rising ground at the northern volcanic rim of the Yellowstone ...

At Puʻuʻōʻō, fissures reopened on either side of the vent, while at Maunaulu, the eruption stalled and the vent collapsed ...

Episode 41 of lava fountaining to more than 1,600 feet high as part of the ongoing episodic summit eruption of Kīlauea ...

Experts have dismissed the possibility of an eruption, saying, 'It’s Yellowstone being Yellowstone.' ...

Located in the United States, one of the world’s largest volcanoes is gearing up to explode. It’s known as the Yellowstone ...

Volcano Watch” is a weekly article and activity update written by US Geological Survey Hawaiian Volcano Observatory scientists and affiliates. Large lava fountains streamed from both the north and ...

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

Add Yahoo as a preferred source to see more of our stories on Google. When you think of the United States, images of sprawling cities and vast landscapes might come to mind, but not the hidden and ...

This map shows the tephra fall associated with episode 41 of Kilauea's episodic summit eruption, on Jan. 24. Tephra is a generic word for any material erupted by a volcano that travels through the air ...