M1.8 earthquake 49 km SSE of Mammoth, Wyoming

A magnitude 1.8 earthquake struck 49 km SSE of Mammoth, Wyoming on Sun, May 7, 2017, 1:04 PM MDT (19:04 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M4.4 12 km E of Hebgen Lake Estates, Montana. 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 199 in the 60 days after this one and 20 in the 30 days before it.

The first 60 of at least 199.

From the USGS Earthquake Hazards Program and its partner networks, event uu60196152. Read Wed, Sep 30, 2026, 1:01 AM UTC.