M2.3 earthquake 55 km SE of West Yellowstone, Montana

A magnitude 2.3 earthquake struck 55 km SE of West Yellowstone, Montana on Sun, May 23, 2021, 5:19 AM MDT (11:19 UTC), 4 km (2 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 11 in the 30 days before it.

The first 60 of at least 201.

From the USGS Earthquake Hazards Program and its partner networks, event uu60437607. Read Mon, Oct 5, 2026, 1:34 PM UTC.