QT Yellowstone Caldera (the eruptions of which can be violent enough to send a layer of ash six feet deep as far away as Chicago and which erupts every 600,000 or so years and last erupted 640,000 years ago) update

The U.S. Geological Survey reports “a small amount of ground uplift” in April–but reassures us that “current deformation patterns at Yellowstone remain within historical norms” after a “fascinating year of ups and downs.”

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