Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano ...

Large explosive eruptions occur in Yellowstone around once every 700,000 years, according to the U.S. Geological Survey.

They are nodule-like rocks typically found in volcanic regions, and specifically, those with rhyolite lavas. They look a bit like geodes, but they’re not exactly geodes. There are three types of ...

That movement has now left one pool of molten material on the west of the caldera disconnected from any heat sources, which will likely allow it to cool. Meanwhile, the largest pool of near-surface ...

Northern California's Sáttítla Highlands are a testament to the region's volcanic past, with the landscape dramatically ...

As soon as rock starts melting ... pockets to deeper reservoirs of molten basalt. Magma made of rhyolite produces characteristic volcanic ash, but basalt is the real driver of eruptions because ...

Underneath Yellowstone, basaltic magma heats the surrounding rock ... If the rhyolite does erupt, Bennington said, it could lead to very explosive eruptions with lots of ash. Recent volcanic ...