California earthquakes

M3.1 earthquake 5 km SW of Cobb, California

A magnitude 3.1 earthquake struck 5 km SW of Cobb, California on Thu, Jun 11, 1987, 8:15 PM PDT (03:15 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.2 6 km W of Cobb, California. This one was a foreshock.

Cobb forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
3.1 (md), minor
Local time
UTC
1987-06-12 03:15:37 UTC
Depth
1.4 km (0.9 mi), shallow
Epicenter
38.786° N, 122.772° 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 0.1 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
37°
Stations used
40

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 174 in the 60 days after this one and 128 in the 30 days before it.

After

The first 60 of 174.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc101776. Read Tue, Sep 29, 2026, 10:07 PM UTC.