M3.5 earthquake 21 km SSW of Mammoth, Wyoming

A magnitude 3.5 earthquake struck 21 km SSW of Mammoth, Wyoming on Sat, May 31, 2014, 4:25 PM MDT (22:25 UTC), 5 km (3 mi) below the surface.

Automatic solution: the magnitude and location may still be revised.

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
3.5	ML, local (Richter)	University of Utah Seismograph Stations	Preferred · Reviewed · ±0.2 · 6 stations
3.3	Mwr, regional moment	USGS National Earthquake Information Center	Reviewed · 13 stations

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

No one has reported feeling this quake to the USGS.

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

An automatic solution; a seismologist may revise it.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 122 in the 60 days after this one and 50 in the 30 days before it.

The first 60 of 122.

From the USGS Earthquake Hazards Program and its partner networks, event uu60070727 (also filed as usc000r9mf). Read Sun, Oct 4, 2026, 7:57 AM UTC.