California earthquakes

M3.7 earthquake 7km SSW of Devore, CA

A magnitude 3.7 earthquake struck 7km SSW of Devore, CA on Wed, Jul 24, 2002, 5:43 PM PDT (00:43 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: 3.7 (ML, local (Richter)), minor
Magnitude from: Southern California Seismic Network
Local time: Wed, Jul 24, 2002, 5:43 PM PDT
UTC: 2002-07-25 00:43:15 UTC
Depth: 5.8 km (3.6 mi), shallow
Epicenter: 34.161° N, 117.429° W
Region: California
Felt reports: 380
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
3.74	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.365 · 127 stations
3.7	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

What happened

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

Felt (V) at Rialto; (IV) at Bloomington and Rancho Cucamonga; (III) at Alta Loma, Colton, Fontana, Mira Loma, Ontario, Redlands, Riverside and San Bernardino; (II) at Chino and Norco.

From the USGS event page for ci13692644. U.S. Geological Survey text and figures are in the public domain.

Did you feel it?

380 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.3 km horizontally, 2.6 km in depth
Magnitude uncertainty: ±0.36
Depth from: From location
Station coverage gap: 29°
Stations used: 104

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 156 in the 60 days after this one and 73 in the 30 days before it.

After

The first 60 of 156.

Before

Earthquakes today California earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci13692644 (also filed as usp000b8qn). Read Sun, Oct 4, 2026, 11:36 PM UTC.