California earthquakes

M1.8 earthquake 6 km WSW of Beale Air Force Base, California

A magnitude 1.8 earthquake struck 6 km WSW of Beale Air Force Base, California on Thu, Jan 8, 1987, 4:23 AM PST (12:23 UTC), 18 km (11 mi) below the surface.

A larger quake followed: M2.4 7 km E of Hidden Valley Lake, California. This one was a foreshock.

Beale Air Force Base forecast More in California

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: Thu, Jan 8, 1987, 4:23 AM PST
UTC: 1987-01-08 12:23:04 UTC
Depth: 18.1 km (11.2 mi), shallow
Epicenter: 39.083° N, 121.422° 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 0.7 km horizontally, 1.8 km in depth
Magnitude uncertainty: ±0.02
Depth from: From location
Station coverage gap: 171°
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: 27 in the 60 days after this one and 42 in the 30 days before it.

After

Before

Earthquakes today California earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc331439. Read Tue, Sep 22, 2026, 4:54 PM UTC.