California earthquakes

M2.3 earthquake 18km NNW of Grapevine, CA

A magnitude 2.3 earthquake struck 18km NNW of Grapevine, CA on Wed, Sep 28, 1983, 2:48 AM PDT (09:48 UTC), 18 km (11 mi) below the surface.

A larger quake followed: M3.2 17km NNW of Grapevine, 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
2.3 (mh), micro
Local time
UTC
1983-09-28 09:48:37 UTC
Depth
17.7 km (11.0 mi), shallow
Epicenter
35.090° N, 119.003° 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 0.9 km horizontally, 1.9 km in depth
Magnitude uncertainty
±0.24
Depth from
From location
Station coverage gap
136°
Stations used
18

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 117 in the 60 days after this one and 70 in the 30 days before it.

After

The first 60 of 117.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci16036. Read Wed, Sep 30, 2026, 9:06 PM UTC.