M2.6 earthquake 12 km N of Koosharem, Utah

A magnitude 2.6 earthquake struck 12 km N of Koosharem, Utah on Mon, Dec 13, 2021, 9:07 PM MST (04:07 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.0 22 km NNW of Panguitch, Utah. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
2.6	ML, local (Richter)	University of Utah Seismograph Stations	Preferred · Final · ±0.155 · 8 stations
2.6	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.039 · 86 stations

2 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 27 in the 60 days after this one and 15 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event uu60471807 (also filed as us6000gc3h). Read Mon, Oct 5, 2026, 7:42 AM UTC.