Long Valley sits next to Mammoth Mountain and is one of the world's largest calderas — a huge, cauldron-like hollow that forms after an eruption.. It measures a whopping 20 miles long and 11 ...

The Long Valley Caldera is the depression formed from the supervolcano eruption 760,000 years ago, which ejected hot ash, lava and toxic gas. The eruption 760,000 years ago erupted 140 cubic miles ...

The Long Valley Caldera, which includes Mammoth Lakes area, has been having seismic activity, which can precede a volcanic eruption. Scientists say not to worry.

Detailed geologic maps of the swarm area, to the south of Long Valley Caldera, show steeply dipping, nearly vertical rock layers that act like a fast conduit for meltwater.

The Long Valley Caldera in California is about 10 miles wide. And one of the most famous calderas in the world, at Yellowstone National Park, measures 30 miles by 45 miles, according to the U.S ...

Scientists identify more than 2,000 quakes at the Long Valley Caldera that they say 'are precursors for an eruption' ... Now experts u-turn and say you SHOULDN'T blur your house on Google Maps ...

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.

The Long Valley Caldera in California is about 10 miles wide. And one of the most famous calderas in the world, at Yellowstone National Park, measures 30 miles by 45 miles, according to the U.S ...