California earthquakes

M1.9 earthquake 10 km NNW of Moskowite Corner, California

A magnitude 1.9 earthquake struck 10 km NNW of Moskowite Corner, California on Mon, Sep 16, 1985, 3:50 PM PDT (22:50 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M1.9 7 km ENE of Clearlake, 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: 1.9 (md), micro
Local time: Mon, Sep 16, 1985, 3:50 PM PDT
UTC: 1985-09-16 22:50:31 UTC
Depth: 9.4 km (5.8 mi), shallow
Epicenter: 38.534° N, 122.222° 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 1.1 km horizontally, 2.9 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 217°, poorly surrounded by stations
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: 161 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 161.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc55239. Read Tue, Sep 22, 2026, 9:38 PM UTC.