M2.8 earthquake 16.6 km SSE of Sunnyside, Utah

A magnitude 2.8 earthquake struck 16.6 km SSE of Sunnyside, Utah on Mon, Dec 6, 2021, 9:22 AM MST (16:22 UTC), -3 km (-2 mi) below the surface.

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
2.77	ML, local (Richter)	University of Utah Seismograph Stations	Preferred · Final · ±0.774 · 2 stations
2.2	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.042 · 76 stations

2 people reported to the USGS what they felt; the strongest reported shaking was III, weak 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: at least 199 in the 60 days after this one and 70 in the 30 days before it.

The first 60 of at least 199.

From the USGS Earthquake Hazards Program and its partner networks, event uu60470897 (also filed as us6000g9hi). Read Sun, Oct 4, 2026, 10:35 PM UTC.