California earthquakes

M2.4 earthquake 4 km SSE of Mesa, California

A magnitude 2.4 earthquake struck 4 km SSE of Mesa, California on Thu, Aug 22, 2002, 1:56 PM PDT (20:56 UTC), 11 km (7 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: 2.4 (Md, duration), micro
Magnitude from: Northern California Seismic System
Local time: Thu, Aug 22, 2002, 1:56 PM PDT
UTC: 2002-08-22 20:56:35 UTC
Depth: 11.3 km (7.0 mi), shallow
Epicenter: 37.375° N, 118.530° 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
2.38	Md, duration	Northern California Seismic System	Preferred · Final · ±0.18 · 36 stations
2.4	ML, local (Richter)	Nevada Seismological Laboratory	Reviewed
2.22	ML, local (Richter)	Southern California Seismic Network	Reviewed · ±0.226 · 6 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 0.2 km horizontally, 0.6 km in depth
Magnitude uncertainty: ±0.18
Depth from: From location
Station coverage gap: 75°
Stations used: 33

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 110 in the 60 days after this one and 34 in the 30 days before it.

After

The first 60 of 110.

Before

Earthquakes today California earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc21241757 (also filed as ci9813365, nn00055055). Read Mon, Oct 5, 2026, 12:54 PM UTC.