California earthquakes

M1.8 earthquake 4 km W of Moskowite Corner, California

A magnitude 1.8 earthquake struck 4 km W of Moskowite Corner, California on Wed, Apr 22, 1987, 7:05 AM PDT (14:05 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M2.1 4 km SW of Glen Ellen, 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), micro
Local time: Wed, Apr 22, 1987, 7:05 AM PDT
UTC: 1987-04-22 14:05:51 UTC
Depth: 6.7 km (4.2 mi), shallow
Epicenter: 38.438° N, 122.240° 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 0.3 km horizontally, 0.6 km in depth
Magnitude uncertainty: ±0.16
Depth from: From location
Station coverage gap: 65°
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: 178 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 178.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc99063. Read Tue, Sep 22, 2026, 8:55 PM UTC.