The Long Valley Caldera in the Eastern Sierra Nevada mountains has been unleashing earthquake swarms on a regular basis since 1978, raising concerns that it might be at risk of erupting.

The Long Valley Caldera was formed by a super-eruption about 760,000 years ago that blasted 140 cubic miles of magma, covering much of east-central California in hot ash that was blown as far away ...

New high-resolution images of the Long Valley Caldera indicate that the subsurface environment is cooling off, releasing gas and fluids that contribute to seismic activity. Since the 1980s ...

The Long Valley Caldera is the largest volcano in California, according to Zhan. It had a super eruption around 720,000 years ago, comparable to the Yellowstone super eruption.But he says the ...

New high-resolution images of the Long Valley Caldera indicate that the subsurface environment is cooling off, releasing gas and fluids that contribute to seismic activity.

A massive supervolcano in California is showing signs of unrest! The Long Valley Caldera, one of the largest volcanic systems in the U.S., has been shaking and rising, with over 2,000 earthquakes ...