California earthquakes

M1.8 earthquake 17km NNW of Grapevine, CA

A magnitude 1.8 earthquake struck 17km NNW of Grapevine, CA on Tue, Sep 20, 1983, 9:32 PM PDT (04:32 UTC), 16 km (10 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
1.8 (mc), micro
Local time
UTC
1983-09-21 04:32:42 UTC
Depth
16.5 km (10.2 mi), shallow
Epicenter
35.090° N, 118.984° 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 1.1 km horizontally, 1.5 km in depth
Depth from
From location
Station coverage gap
138°
Stations used
7

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 153 in the 60 days after this one and 38 in the 30 days before it.

After

The first 60 of 153.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci14933. Read Tue, Sep 29, 2026, 6:39 PM UTC.