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 ...

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 ...

Large volcanic calderas, aka supervolcanoes, are enormous craters tens of kilometers in diameter produced by giant, explosive eruptions that rank among the most violent geologic events. Geophysical ...

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 ...

The discovery of 86,276 previously undetected earthquakes beneath Yellowstone has reignited public anxiety about the park’s vast supervolcano and what it might be quietly preparing underground. The ...

Like most scientific advances, the answer builds on a long history of previous investigations — in this case, geologic mapping along the margins of the Snake River Plain (SRP), a volcanic province ...

Mountain building occurred all around the Yellowstone region and highlights a tortured geological history of uplift and volcanism. The Gallatin Range, just northeast of Yellowstone Caldera, is an ...

Most visitors to Yellowstone are entranced by the spectacular thermal features and evidence of past volcanic eruptions that dot the landscape and that are a testament to the recent geological activity ...

VOLCANOES NATIONAL PARK A good field geologist is an opportunist. Never content with what outcrops are available, she jumps at the chance to see another one, hoping that it will provide a better ...

It’s been around 100,000 years since California’s Long Valley supervolcano experienced a major eruption, but this supposedly dormant caldera has been acting a bit strangely over the past four decades.

Boulder, Colo., USA: The caldera-forming eruption of Campi Flegrei (Italy) 40,000 years ago is the largest known eruption in Europe during the last 200,000 years, but little is known about other large ...

BEND, Ore. — When the mood to move strikes my family, there’s no better way to celebrate summer than packing up and moving out toward our annual camping trip at the Newberry National Volcanic Monument ...