Although the Yellowstone caldera's initial blast would kill thousands in a 'super-eruption,' showering multiple US states in 'pyroclastic flows' of high-speed lava, rock and hot gas, Poland said ...

The last three super-eruptions have been in Yellowstone itself. The most recent, 640,000 years ago, was a thousand times the size of the Mount St. Helens eruption in 1980, which killed 57 people ...

In the meantime, researchers are keeping a close watch on Yellowstone to check for warning signs that an eruption might be underway.

How likely is an eruption of the Yellowstone Supervolcano in the USA? Researchers who interpret early warning signs predict an eruption. A huge magma chamber lies dormant beneath the Earth's crust.

One question that lurks in the back of many visitors’ minds as they traverse through one of the world’s largest active volcanoes is: when is Yellowstone’s next eruption going to be?

Narrator: There's a volcano beneath Yellowstone National Park. But it's not your average volcano. It's hundreds of meters deep, larger than the state of Rhode Island and capable of eruptions ...

“But that doesn’t mean that it’s going to have other super eruptions ... like in Yellowstone and the world’s other supervolcanoes, the probability of a catastrophic eruption is low but ...

One question that lurks in the back of many visitors’ minds as they traverse through one of the world’s largest active volcanoes is: when is Yellowstone’s next eruption going to be?

Recently, rumors have been swelling of a danger at Yellowstone National Park. That danger? A brewing supervolcano eruption. The fear of a Yellowstone supereruption, which ultimately went viral ...