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

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 ...

Yellowstone is a dynamic geologic system—the one constant is change. This is demonstrated daily by hydrothermal activity ...

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

Add Yahoo as a preferred source to see more of our stories on Google. A new thermal pool in the Porcelain Basin area of Norris Geyser Basin, Yellowstone National Park, shown here, likely formed in a ...

The same geyser that erupted last summer in a hydrothermal explosion in Yellowstone National Park was recorded erupting again, video shows. “Small eruption from Black Diamond Pool, site of a ...

WENDY STOVALL and WILLIAM KELLER Yellowstone Volcano Observatory Yellowstone National Park Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone ...

A bison in Yellowstone National Park appeared to stumble into the scalding water of Grand Prismatic Spring, causing its death as tourists looked on during the park's busiest season. The bison fell ...

The same geyser that erupted last summer in a hydrothermal explosion along a Yellowstone National Park boardwalk was caught erupting on video again thanks to a newly-installed webcam to track the ...