M2.1 earthquake 28 km S of Mammoth, Wyoming

A magnitude 2.1 earthquake struck 28 km S of Mammoth, Wyoming on Tue, May 18, 2021, 8:48 AM MDT (14:48 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.6 63 km SSE of Mammoth, Wyoming. This one was a foreshock.

Map

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

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 201 in the 60 days after this one and 9 in the 30 days before it.

The first 60 of at least 201.

From the USGS Earthquake Hazards Program and its partner networks, event uu60436372. Read Sun, Oct 4, 2026, 8:50 PM UTC.