Epicenter of this moderate quake appears to be in Gros Ventre River valley upstream from Jackson Hole-
Earthquake hits Wyoming; landslide reported. Associated Press
Here is more detailed information from USGS.
Update. 4.4 earthquake jiggles valley. By Angus M. Thuermer Jr.. Jackson Hole Daily
Ralph Maughan
Dr. Ralph Maughan is professor emeritus of political science at Idaho State University. He was a Western Watersheds Project Board Member off and on for many years, and was also its President for several years. For a long time he produced Ralph Maughan's Wolf Report. He was a founder of the Greater Yellowstone Coalition. He and Jackie Johnson Maughan wrote three editions of "Hiking Idaho." He also wrote "Beyond the Tetons" and "Backpacking Wyoming's Teton and Washakie Wilderness." He created and is the administrator of The Wildlife News.
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FYI
http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/quakes_all.html
I don’t think alot of us realize just how much “shaking” is really goin on!