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

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

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

Yellowstone National Park's restless ground has captured attention once more, as subtle shifts beneath its steaming landscapes signal the planet's inner workings. After years of stability, a zone ...

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

Is this aught that foreshadows a pop, Or any other danger? No, replied Michael Poland, a geophysicist and Scientist-in-Chief at the Yellowstone Volcano Observatory, as the concern went back to an ...

That’s the word U.S. Geological Survey volcanic experts used to describe a muddy eruption at Black Diamond Pool in Yellowstone National Park on Saturday morning. Video shared by the USGS on social ...

That’s the word U.S. Geological Survey volcanic experts used to describe a muddy eruption at Black Diamond Pool in Yellowstone National Park on Saturday morning. Video shared by the USGS on social ...

A muddy eruption at Black Diamond Pool in Yellowstone National Park has been captured on camera. The video was recorded by the Yellowstone Volcano Observatory webcam Saturday morning. They said the ...

That’s the word U.S. Geological Survey volcanic experts used to describe a muddy eruption at Black Diamond Pool in Yellowstone National Park on Saturday morning. Video shared by the USGS on social ...

That's the word U.S. Geological Survey volcanic experts used to describe a muddy eruption at Black Diamond Pool in Yellowstone National Park on Saturday morning. Video shared by the USGS on social ...

Lassen Volcanic National Park, about a four-hour drive north of San Francisco, feels like a secret getaway.