M3.4 earthquake 20 km SSW of Mammoth, Wyoming

A magnitude 3.4 earthquake struck 20 km SSW of Mammoth, Wyoming on Tue, Jun 3, 2014, 3:33 AM MDT (09:33 UTC), 10 km (6 mi) below the surface.

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

A larger quake followed: M3.5 21 km SSW 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
3.4	ML, local (Richter)	University of Utah Seismograph Stations	Preferred · Reviewed · ±0.2 · 14 stations
3.8	Mwr, regional moment	USGS National Earthquake Information Center	Reviewed · 23 stations

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

4 people reported to the USGS what they felt; the strongest reported shaking was V, moderate shaking.

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: 92 in the 60 days after this one and 80 in the 30 days before it.

The first 60 of 92.

From the USGS Earthquake Hazards Program and its partner networks, event uu60071202 (also filed as usc000rae0). Read Fri, Oct 2, 2026, 3:04 PM UTC.