The supervolcano is hiding underneath the Yellowstone National Park, which is a secret natural force that has potentials to cover the United States in to ash and transform the world in to the volcanic winter.
The disaster has a capability to erupt materials as 2500 times more than that from the Mount St. Helens, which is an active composite volcano occurred 1980 at Skamania County in Washington, which had killed 57 people.
The researchers from Arizona State University have analyzed the minerals found in the fossilized ash taken out from the latest mega-eruption.
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And in an unsettling twist, the minerals revealed that the critical changes in temperature and composition built up in a matter of decades.
It's important to note there's a big difference between volcanoes and supervolcanoes, as ZME Science reported. Depending on the size of the eruption, the volcano could cover major portions of the United States in unsafe ash, and the Earth's atmosphere would likely be filled with that same ash. Until now, geologists believed it would take centuries for the supervolcano to make that transition.
Tiny crystals left over from underground magma at Yellowstone show the first sign of the last supereruption was a spike in temperature that coincided with the movement of new magma into the reservoir beneath the supervolcano.
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If the supervolcano underneath Yellowstone erupts again, we may have far less advance warning time than we thought. It's also news because, as the Times notes, decades are but "a blink of an eye, geologically speaking".
The swelling magma reservoir responsible for the uplift was too deep to create fears of imminent doom, Smith said, and instead the caldera's gentle "breathing" offered valuable insights into the supervolcano's behaviour.
"We expected that there might be processes happening over thousands of years preceding the eruption", said Till said in an interview with the New York Times.
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In 2012, other scientists reported that at least one of the past super-eruptions may have really been two events - suggesting that such large-scale events may be more common than thought.