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

There have been 771 earthquakes just northwest of
Yellowstone since February 1, with the ground  rising north of Yellowstone after sinking for a time, while the ground continues to sink in central Yellowstone, and have a nice day.

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