A scalding-hot pool of mineral water is shown at the Long Valley Caldera in 2019 near Mammoth Lakes. (George Rose / Getty Images) One of California's riskiest volcanoes has for decades been undergoing ...

What's going on beneath the surface of the Long Valley Caldera, the site of a massive supervolcano eruption 760,000 years ago? A new study uses seismic waves to image the underground environment in ...

Two long-dormant “supervolcanoes” on two separate continents appear to be stirring to life. Well, maybe. In recent months, more than a thousand minor earthquakes have rattled the area around the Campi ...

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A new study looks at rock from the titanic eruption that formed Long Valley Caldera in California 765,000 years ago. Calderas occur when a volcano collapses after an eruption. Long Valley has been ...

One of California's riskiest volcanoes has for decades been undergoing geological changes and seismic activity, which are sometimes a precursor to an eruption, but — thankfully — no supervolcanic ...

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, ...