M2.5 earthquake 20 km SSW of Mammoth, Wyoming

A magnitude 2.5 earthquake struck 20 km SSW of Mammoth, Wyoming on Wed, Jun 4, 2014, 9:20 AM MDT (15:20 UTC), 6 km (4 mi) below the surface.

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

A larger quake followed: M3.4 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
2.5	ML, local (Richter)	University of Utah Seismograph Stations	Preferred · Reviewed · ±0.3 · 4 stations
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.3 · 4 stations

No one has reported feeling this quake to the USGS.

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: 49 in the 60 days after this one and 120 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event uu60071907 (also filed as usc000rb44). Read Sat, Oct 3, 2026, 2:19 PM UTC.