The Yellowstone Supervolcano snores through the geysers and mud pots, and restlessly tumbles as multiple earthquakes hit the region nearly every day. We don't hear a lot about Yellowstone earthquakes, but each year one to three thousand hit the park and surrounding area. Most can't even be felt, but there have already been four this year in the lower-3.0 magnitude range. Enough to shake pots and pans on the wall. And a 4.4 hit to the west of Yellowstone just a couple days before this recording—right near the center of the biggest Yellowstone earthquake in recent history, a 7.5. Today on America's National Parks, The Night The Mountain Fell — the story of the Montana-Yellowstone Earthquake of 1959, as told in the book with the same name by Edmund Christopherson.