M3.0 earthquake 5km E of Trona, CA

A magnitude 3.0 earthquake struck 5km E of Trona, CA on Mon, Mar 12, 1973, 7:08 AM PST (15:08 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.1 9km NNE of Kernville, 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
3.04	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.012 · 5 stations
3.3	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

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: 6 in the 60 days after this one and 2 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ci3320139 (also filed as usp00000xp). Read Thu, Oct 1, 2026, 1:21 PM UTC.