The Long Valley Caldera, a massive supervolcano in California, has been causing unease among researchers due to its potential ...

The city of Mammoth Lakes sits on the edge of the Long Valley Caldera formed around 700,000 years ago. This caldera is 15 miles in diameter and is North America's second largest. 1. The Long ...

Fears are mounting over the potential eruption of a supervolcano in California, which has been dormant for hundreds of thousands of years. The Long Valley Caldera, spanning 20 miles long ...

Beneath the Earth’s surface are ticking time bombs. Two supervolcanoes, located in Italy and California, have long been dormant, but have been stirring as earthquakes in the region become more ...