Yellowstone's supervolcano last erupted 70,000 years ago. Will it erupt again anytime soon?
Beneath Yellowstone National Park, a vast region of spectacular wilderness visited by around 3 million people annually , lurks one of the largest volcanoes in the world.
"This is perhaps the most common misconception about Yellowstone, and about volcanoes in general. Volcanoes don't work on timelines," Michael Poland , a geophysicist and the scientist-in-charge at Yellowstone Volcano Observatory, told Live Science in an email."They erupt when there is enough eruptible magma beneath the surface, and pressure to cause that magma to ascend.
"I suspect the 'overdue' idea comes from the concept of earthquakes," Poland said."Earthquakes happen as stress accumulates on faults, and in many places this stress accumulates at relatively constant rates due to, for example, plate motion. That being the case, you might expect earthquakes to occur at somewhat regular intervals.
While Yellowstone is relatively stable right now and has not displayed any unusual seismic activity lately, if it were to erupt, the consequences could be extreme. Volcanologists have suggested that the ramification they are most concerned about is wind-flung ash, which could end up coating a surrounding region 500 miles across in more than 4 inches of ash. This could, experts predict, result in the short-term destruction of Midwest agriculture, and would leave scores of watercourses clogged.
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