M3.5 earthquake 20 km SSW of Mammoth, Wyoming

A magnitude 3.5 earthquake struck 20 km SSW of Mammoth, Wyoming on Wed, Mar 26, 2014, 5:59 PM MDT (23:59 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M4.8 22 km S of Mammoth, Wyoming. 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
3.53	ML, local (Richter)	University of Utah Seismograph Stations	Preferred · Final · ±0.236 · 6 stations
3.5	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.2 · 6 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.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 195 in the 60 days after this one and 59 in the 30 days before it.

The first 60 of 195.

From the USGS Earthquake Hazards Program and its partner networks, event uu60061297 (also filed as usc000ns9t). Read Fri, Oct 2, 2026, 7:21 AM UTC.