Yellowstone National Park has been shaking more than usual today. As of this writing, there have been 49 measurable earthquakes just south of Yellowstone Lake.
The shaking has continued in Salt Lake City since the major earthquake on March 18. There are reports they've had over 600 quakes in the last two weeks alone.
We get a lot of earthquakes in Wyoming. Most are near the very seismically active area near Yellowstone. That's why it was a bit of a surprise to learn that an earthquake just occurred in southern Wyoming near Saratoga.
I doubt that even the pronghorn that were grazing right above this were aware that anything happened, but there was a minor earthquake west of Casper Sunday morning.