M3.1 earthquake 11km NNE of Coso Junction, CA

A magnitude 3.1 earthquake struck 11km NNE of Coso Junction, CA on Fri, Jun 18, 2021, 11:16 AM PDT (18:16 UTC), 6 km (3 mi) below the surface.

A larger quake followed: M3.5 14km ENE of Ridgecrest, CA. 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
3.09	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.156 · 85 stations
2.9	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.028 · 164 stations

2 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 144 in the 60 days after this one and 113 in the 30 days before it.

The first 60 of 144.

From the USGS Earthquake Hazards Program and its partner networks, event ci39711727 (also filed as us7000ee7y). Read Sat, Oct 3, 2026, 3:19 PM UTC.