M2.3 earthquake 33km WSW of Tecopa, CA

A magnitude 2.3 earthquake struck 33km WSW of Tecopa, CA on Sun, Aug 4, 2002, 12:09 PM PDT (19:09 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.1 21km NNE of Trona, 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
2.34	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.187 · 18 stations
2.2	ML, local (Richter)	Nevada Seismological Laboratory	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: 62 in the 60 days after this one and 16 in the 30 days before it.

The first 60 of 62.

From the USGS Earthquake Hazards Program and its partner networks, event ci9806209 (also filed as nn00054115). Read Mon, Oct 5, 2026, 12:05 PM UTC.