Mammoth, Wyoming – A magnitude 3.6 earthquake struck 22 kilometers south-southwest of Mammoth, Wyoming Tuesday afternoon, briefly shaking parts of the Yellowstone region but causing no reported damage.
According to the University of Utah Seismograph Stations, the quake hit at 11:14 a.m. MDT (17:14 UTC) at a shallow depth of 10.7 kilometers. Four users reported feeling light shaking, with a community internet intensity rating of IV, meaning mild but noticeable movement indoors.
Centered in the northwestern corner of Yellowstone National Park, the quake was likely felt in Mammoth Hot Springs and surrounding areas of Park County. No infrastructure or park operations have been affected, but visitors and residents are reminded that Yellowstone is one of the most seismically active regions in the continental U.S.
The region sees frequent small earthquakes as part of natural tectonic and volcanic activity. While today’s event is considered minor, the USGS recommends residents be prepared with emergency kits and review quake safety procedures—especially in areas near thermal features or rockfall zones.
Aftershocks are possible, though none have been recorded as of Tuesday afternoon. Seismologists will continue to monitor the area for increased activity in the coming days.
