According to the United States Geological Survey, Yellowstone National Park typically experiences minor earthquakes of a magnitude 2 or below on the Richter Scale. On Tuesday, May 11, that was not the case when a magnitude 4.2 earthquake rattled Yellowstone.
I will admit that I'm an earthquake nerd, so I tend to follow earthquakes pretty much all around our region. However, I don't recall ever seeing one happen in the Black Hills of South Dakota...until today.
Wyoming has earthquakes all the time. Most are in the western part of the state near the seismically-active Yellowstone. But, a moderate quake has just struck where we don't usually see earthquakes just south of the Bighorns.