M3.7 earthquake 21 km S of Mammoth, Wyoming

A magnitude 3.7 earthquake struck 21 km S of Mammoth, Wyoming on Sun, Mar 30, 2014, 9:12 AM MDT (15:12 UTC), 3 km (2 mi) below the surface.

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
3.66	ML, local (Richter)	University of Utah Seismograph Stations	Preferred · Final · ±0.32 · 6 stations
3.7	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.3 · 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: 145 in the 60 days after this one and 114 in the 30 days before it.

The first 60 of 145.

From the USGS Earthquake Hazards Program and its partner networks, event uu60003995 (also filed as usc000nwxq). Read Fri, Oct 2, 2026, 1:52 PM UTC.