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.
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The U.S. Geological Survey (USGS) also states that it is very unlikely that a nuclear blast could trigger an eruption of Yellowstone. The now-dormant volcano has been undisturbed by much greater releases of energy in the form of earthquakes.
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.
Yellowstone's greatest geological threat isn't a supervolcano. It's a magnitude-7 earthquake. YELLOWSTONE NATIONAL PARK, Wyo. – While concerns about a potential eruption of the supervolcano beneath this iconic park may garner the most alarming headlines, a more likely hazard in the coming decades is a large earthquake.
Some stats on the Yellowstone supervolcano: A super-eruption would equal the force of 1,000 Hiroshima atomic bombs exploding every second. You could fit Tokyo, the world's biggest city, in Yellowstone's super-volcanic crater.