M2.1 earthquake 16 km SSE of Sunnyside, Utah

A magnitude 2.1 earthquake struck 16 km SSE of Sunnyside, Utah on Mon, Dec 27, 2021, 11:46 PM MST (06:46 UTC), -3 km (-2 mi) below the surface.

A larger quake followed: M2.7 11 km WSW of Spring Glen, 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
2.06	ML, local (Richter)	University of Utah Seismograph Stations	Preferred · Final · ±0.28 · 5 stations
2.4	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.042 · 74 stations

The USGS’s account of the effects of this earthquake.

Probable coal bump.

From the USGS event page for uu60474762. U.S. Geological Survey text and figures are in the public domain.

No one has reported feeling this quake to the USGS.

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 32 in the 30 days before it.

The first 60 of at least 199.

From the USGS Earthquake Hazards Program and its partner networks, event uu60474762 (also filed as us6000gft0). Read Sat, Oct 3, 2026, 1:04 PM UTC.