California earthquakes

M2.1 earthquake 7km SE of Temecula, CA

A magnitude 2.1 earthquake struck 7km SE of Temecula, CA on Mon, Sep 28, 1981, 2:25 AM PDT (09:25 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M2.6 6km SE of Temecula, 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
2.1 (ml), micro
Local time
UTC
1981-09-28 09:25:35 UTC
Depth
8.1 km (5.0 mi), shallow
Epicenter
33.450° N, 117.100° W
Tsunami flag
No
Status
Reviewed by a seismologist

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 0.4 km horizontally, 1.1 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
67°
Stations used
30

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 137 in the 60 days after this one and 54 in the 30 days before it.

After

The first 60 of 137.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci523633. Read Wed, Sep 23, 2026, 12:51 AM UTC.