The 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:
Earthquakes increased 11 percent during June.
Researchers said the earthquakes and seismic uplift continue to be "scientifically interesting."
Have a great night!!












