M4.1 earthquake 21km NNE of Trona, CA

A magnitude 4.1 earthquake struck 21km NNE of Trona, CA on Sat, Sep 28, 2002, 3:34 AM PDT (10:34 UTC), 3 km (2 mi) below the surface.

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
4.13	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.897 · 128 stations
4.1	mb, body-wave	USGS National Earthquake Information Center	Reviewed · 1 stations

The USGS’s account of the effects of this earthquake.

Felt (IV) at Trona, (III) at Ridgecrest and (II) at Inyokern.

From the USGS event page for ci9828889. U.S. Geological Survey text and figures are in the public domain.

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: 103 in the 60 days after this one and 31 in the 30 days before it.

The first 60 of 103.

From the USGS Earthquake Hazards Program and its partner networks, event ci9828889 (also filed as usp000bdau). Read Mon, Oct 5, 2026, 12:08 PM UTC.