California earthquakes

M1.8 earthquake 9 km S of Moskowite Corner, California

A magnitude 1.8 earthquake struck 9 km S of Moskowite Corner, California on Sat, Sep 10, 1983, 2:35 PM PDT (21:35 UTC), 7 km (5 mi) below the surface.

A larger quake followed: M3.5 9 km W of Cobb, 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: 1.8 (Md, duration), micro
Magnitude from: Northern California Seismic System
Local time: Sat, Sep 10, 1983, 2:35 PM PDT
UTC: 1983-09-10 21:35:56 UTC
Depth: 7.3 km (4.5 mi), shallow
Epicenter: 38.362° N, 122.187° W
Region: California
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 0.8 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.34
Depth from: From location
Station coverage gap: 126°
Stations used: 8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 165 in the 60 days after this one and 88 in the 30 days before it.

After

The first 60 of 165.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1102421. Read Thu, Oct 1, 2026, 1:05 PM UTC.