Caldera Chronicles

Early explorers during the separate Washburn, Hayden, and Hague expeditions of the 1870s were astonished by the massive terraces and pools of hot...

Yellowstone’s hot spring waters ultimately flow for thousands of miles before entering the ocean. But waters enter two different oceans—the Gulf of...

Small hydrothermal explosions—steam blasts—are common at Yellowstone, occurring every year or two.  Most happen in the backcountry and are not...

Earthquake swarms are common at Yellowstone, but why do they occur?  Are they driven by magma migration?  Water?  Steady creep along faults?  All...

Visitors to Mammoth Hot Springs in Yellowstone National Park might have noticed an odd geological feature near the top of Mount Everts—an unconformity...

Henry Wood Elliott was a dedicated conservationist and explorer who, in 1871, helped create the first bathymetric map of Yellowstone Lake. Unlike many...

Yellowstone National Park is truly a wonder of nature, globally appreciated for its untamed beauty. Visited by millions each year, tourists travel...

Standing on the boardwalk next to any of Yellowstone’s hot, steamy, vigorously bubbling hot springs, mud pots, fumaroles, or geysers, you may be...

For half the year, Yellowstone is largely inaccessible to geologists, buried under snow and ice and subject to fierce storms.  By May, however...

Yellowstone Volcano Observatory scientists investigate many aspects of the Yellowstone volcanic system, including the incredible geysers that are a...