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 ...

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 ...

A GIANT supervolcano hidden beneath California could be an equal if not greater threat to the US than Yellowstone volcano, scientists have revealed. The 20-mile long Long Valley Caldera in eastern ...

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.

05:07, Sun, Aug 12, 2018 Updated: 09:19, Sun, Aug 12, 2018 The amount of magma in the Long Valley Caldera is so large it could support an eruption equivalent to the massive one which occurred 767,000 ...