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

Seismometer

Yellowstone  recorded more than 1,000 earthquakes in the first half of the year, according to the U.S. Geological Survey, with seismic activity doubling in the past month.
But the area remains otherwise quiet.
Too quiet.

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