It may be famous for its reliable 'Old Faithful' geyser, but one should never forget that Yellowstone National Park sits on top of a rumbling, dynamic, active supervolcano. Changes are always happening, sometimes spectacularly, sometimes less so.

Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week's contribution is from Jennifer Lewicki, research geologist with the U.S. Geological Survey in Menlo Park, California.

BILLINGS — Yellowstone National Park harbors a potentially dangerous volcanic system and more needs to be done keep track of it, according to a new report by the U.S. Geological Survey. Improving monitoring at Yellowstone is listed as a ‘‘high ...

United States Geological Survey (USGS) scientist Mark Stelton (left) and Kenneth Sims, a UW professor of geology and geophysics and a member of the USGS Yellowstone Volcano Observatory, examine a large tephra deposit inside of the Henrys Forks Caldera.

(WYOMING) -- More geological changes are occurring at Yellowstone National Park, as another hole forms in one of the park's basins. The hole is a blue water spring, discovered by geologists in April as they conducted routine maintenance of temperature ...

Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week's contribution is from Behnaz Hosseini, geologist, and Jefferson Hungerford, park geologist, at the Yellowstone ...