Yellowstone supervolcano magma chamber has far more melted rock than thought. Scientists have worked out the consistency of the magma under the Yellowstone caldera using seismic waves — and the reservoir is filled with mush that doesn't pose an imminent eruption threat.
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Thrihnukagigur Volcano is the only spot on earth where it's advisable to explore a magma chamber from the inside. The volcano has not erupted for 4.000 years and shows no signs of coming to life anytime soon, so it is safe to enter.
Nestled in the San Juan Mountains, there is ample evidence of one of the largest known volcanic eruptions on the planet: a caldera 22 miles wide and 62 miles long. It's called the La Garita Caldera, and it rivals the Toba eruption in Indonesia and all Yellowstone eruptions.
What would happen if a supervolcano eruption occurred again at Yellowstone? If another large, caldera-forming eruption were to occur at Yellowstone, its effects would be worldwide. Such a giant eruption would have regional effects such as falling ash and short-term (years to decades) changes to global climate.
This giant is the “supervolcano” that lies beneath Yellowstone National Park, the wildlife and forest preserve positioned on a sprawling expanse that extends through the states of Wyoming, Idaho, and Montana.
But how many people can say they've been inside a volcano? Inside the magma chamber of a dormant, lava spewing beast? Turns out, only people that have been to Thríhnukagigur Volcano in Iceland.