Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week's contribution is from James Mauch, geologist with the ...

Unraveling Yellowstone's geologic complexities has been Ken's passion since he began working there in 1965, and it continues to be so. Meticulous observations and careful field work have supported his ...

This photo shows the exposure of the Mount Jackson Rhyolite Series vitrophyre at Gibbon River. Boulders of weathered, lichen-covered rock show how easy it is to overlook these new units. (Photo by Liv ...

Tens of thousands of hidden earthquakes were recently discovered beneath the Yellowstone volcano by a group of international ...

Back in the 1960s and 70s, a group of United States Geological Survey mappers set out to determine what rocks made up the Yellowstone Volcanic Field. Identifying the rocks that make up a region is not ...

A map showing how the ground around the Yellowstone supervolcano has deformed over the last two years has been released by the U.S. Geological Survey. The map, by USGS geophysicist Chuck Wicks, shows ...

Yellowstone volcano eruption simulations show an unexpected blast would produce ash fallout from the Northwest US down to the southern tip of Florida. Volcanic ash fallout of more than 39.4 inches ...

You probably know that Yellowstone National Park’s iconic Old Faithful, which fires geysers up to 180 feet in the air, gets its kick from underlying magma that heats and propels water. You know that ...

The breathtaking beauty of Yellowstone National Park and its stunning hydrothermal features may have you exclaim: "Hold on to your hats!" The U.S. Geological Survey asks you to take that literally.