M2.6 earthquake 25 km SSE of Mammoth, Wyoming

A magnitude 2.6 earthquake struck 25 km SSE of Mammoth, Wyoming on Mon, Oct 4, 2021, 6:30 PM MDT (00:30 UTC), 5 km (3 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
2.61	ML, local (Richter)	University of Utah Seismograph Stations	Preferred · Final · ±0.266 · 7 stations
2.1	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.05 · 53 stations

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: 46 in the 60 days after this one and 43 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event uu60461542 (also filed as us6000frqx). Read Sun, Oct 4, 2026, 11:52 PM UTC.