The Yellowstone Caldera in north-western Wyoming is one of the largest volcanoes in the world. In the past 2.1 million years, it has seen three catastrophic eruptions that blanketed North America in ash and a number of smaller eruptions where lava flowed within the caldera, most recently 70,000 years ago.
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Supervolcano in Southern Utah is 30 times larger than Yellowstone.
The uncontested heavyweight champion of the National Park System is Alaska's Wrangell-St. Elias National Park & Preserve. At 13.2 million acres, it's larger than Yellowstone National Park, Yosemite National Park, and Switzerland combined.
Yellowstone Supervolcano (Wyoming, United States) Effects of a major eruption: When the Yellowstone Caldera, or supervolcano, in Yellowstone National Park erupts again, its effects would be worldwide, the U.S. Geographical Survey said.
Volcanic activity began in the Yellowstone National Park region a little before about 2 million years ago. Molten rock (magma) rising from deep within the Earth produced three cataclysmic eruptions more powerful than any in the world's recorded history.
Those parts of the surrounding states of Montana, Idaho, and Wyoming that are closest to Yellowstone would be affected by pyroclastic flows, while other places in the United States would be impacted by falling ash (the amount of ash would decrease with distance from the eruption site).
The Yellowstone supervolcano last erupted about 640,000 years ago. A sleeping giant is nestled in the western part of the United States. Though it stirs occasionally, it has not risen from slumber in nearly 70,000 years.
The La Garita eruption was over 10,000 times as violent as Mt. St. Helens… La Garita blew out 1,500 cubic miles of rock and ash, nearly three times the amount from Yellowstone…