M3.4 earthquake 24km NNE of Trona, CA

A magnitude 3.4 earthquake struck 24km NNE of Trona, CA on Sun, Feb 7, 2021, 10:57 AM PST (18:57 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M4.0 10km SE of Olancha, 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
3.41	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.096 · 80 stations
3.1	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.028 · 171 stations

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

5 people reported to the USGS what they felt; the strongest reported shaking was IV, light 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: 199 in the 60 days after this one and 102 in the 30 days before it.

The first 60 of 199.

From the USGS Earthquake Hazards Program and its partner networks, event ci39543967 (also filed as us6000dfem). Read Sun, Oct 4, 2026, 4:25 AM UTC.