California earthquakes

M3.6 earthquake 6 km S of Bridgeport, California

A magnitude 3.6 earthquake struck 6 km S of Bridgeport, California on Sat, Aug 10, 2002, 10:41 PM PDT (05:41 UTC), 9 km (5 mi) below the surface.

A larger quake followed: M3.8 9 km W of Aspen Springs, California. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.6 (ML, local (Richter)), minor
Magnitude from: Northern California Seismic System
Local time: Sat, Aug 10, 2002, 10:41 PM PDT
UTC: 2002-08-11 05:41:31 UTC
Depth: 8.6 km (5.4 mi), shallow
Epicenter: 38.197° N, 119.239° W
Region: California
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

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
3.64	ML, local (Richter)	Northern California Seismic System	Preferred · Final · 13 stations
3.7	Mw, moment	USGS National Earthquake Information Center	Reviewed
3.17	ML, local (Richter)	Southern California Seismic Network	Reviewed · ±0.237 · 3 stations

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.3 km horizontally, 0.5 km in depth
Depth from: From location
Station coverage gap: 106°
Stations used: 95

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 102 in the 60 days after this one and 50 in the 30 days before it.

After

The first 60 of 102.

Before

Earthquakes today California earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc21239975 (also filed as ci9808329, usp000b9pn). Read Mon, Oct 5, 2026, 1:53 PM UTC.