California earthquakes

M3.0 earthquake 7km SSW of Devore, CA

A magnitude 3.0 earthquake struck 7km SSW of Devore, CA on Tue, Aug 13, 2002, 3:09 AM PDT (10:09 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.8 4km NE of Yorba Linda, CA. 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: 3.0 (ML, local (Richter)), minor
Magnitude from: Southern California Seismic Network
Local time: Tue, Aug 13, 2002, 3:09 AM PDT
UTC: 2002-08-13 10:09:49 UTC
Depth: 6.5 km (4.0 mi), shallow
Epicenter: 34.167° N, 117.436° W
Region: California
Felt reports: 150
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
3.04	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.237 · 117 stations
3.0	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

What happened

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

Felt (III) at Fontana, Rancho Cucamonga and Rialto. Also felt at Riverside and San Bernardino.

From the USGS event page for ci9808837. U.S. Geological Survey text and figures are in the public domain.

Did you feel it?

150 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.3 km horizontally, 1.3 km in depth
Magnitude uncertainty: ±0.24
Depth from: From location
Station coverage gap: 17°
Stations used: 102

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 162 in the 60 days after this one and 79 in the 30 days before it.

After

The first 60 of 162.

Before

Earthquakes today California earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci9808837 (also filed as ci09808837, usp000b9ts). Read Sun, Oct 4, 2026, 5:54 PM UTC.