Add Yahoo as a preferred source to see more of our stories on Google. Two long-dormant “supervolcanoes” on two separate continents appear to be stirring to life. Well, maybe. In recent months, more ...

Add Yahoo as a preferred source to see more of our stories on Google. A scalding-hot pool of mineral water is shown at the Long Valley Caldera in 2019 near Mammoth Lakes. (George Rose / Getty Images) ...

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 ...

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 ...

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 ...

This story is free to read because readers choose to support LAist. If you find value in independent local reporting, make a donation to power our newsroom today. The U.S. Geological Survey deemed the ...

Mammoth Mountain is best known for its ski runs, but the terrain surrounding this California resort ranks among the most volcanically complex in North America. Beneath and around it lies a chain of ...

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, ...