M2.6 earthquake 41 km SSE of Mammoth, Wyoming

A magnitude 2.6 earthquake struck 41 km SSE of Mammoth, Wyoming on Fri, Sep 3, 2021, 11:51 PM MDT (05:51 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.2 44 km ENE of Warm River, Idaho. 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 · ±0.291 · 4 stations
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.053 · 46 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: 75 in the 60 days after this one and 8 in the 30 days before it.

The first 60 of 75.

From the USGS Earthquake Hazards Program and its partner networks, event uu60028654 (also filed as us7000f7xd). Read Sun, Oct 4, 2026, 6:50 PM UTC.