It was a busy year in Yellowstone National Park, with 2025 featuring 1,136 earthquakes, the formation of new geological features and millions of visitors -- some of whom left without their hats.

Tens of thousands of hidden earthquakes were recently discovered beneath the Yellowstone volcano by a group of international scientists, revealing ways to better inform the public of potential risks.

Get any of our free daily email newsletters — news headlines, opinion, e-edition, obituaries and more. Yellowstone is a dynamic geologic system—the one constant is change. This is demonstrated daily ...

Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week’s contribution is from Jamie Farrell, associate research ...