Most tourists who visit Yellowstone National Park snap photos of Old Faithful and stroll past bubbling mud pots, never realizing they're walking on top of one of Earth's most powerful geological ...

A caldera—like the one at Yellowstone Park spanning parts of Wyoming, Idaho and Montana—is a large depression or hollow formed when a volcano erupts and the magma chamber beneath it empties, leading ...

Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week's contribution is from R. Greg Vaughan, research scientist ...