California earthquakes

M3.3 earthquake 14 km NNE of Mesa, California

A magnitude 3.3 earthquake struck 14 km NNE of Mesa, California on Tue, Oct 28, 1986, 3:47 AM PST (11:47 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.4 19 km ENE of Mono City, 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: 3.3 (ml), minor
Local time: Tue, Oct 28, 1986, 3:47 AM PST
UTC: 1986-10-28 11:47:23 UTC
Depth: 4.0 km (2.5 mi), shallow
Epicenter: 37.531° N, 118.450° 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 0.2 km horizontally, 0.4 km in depth
Depth from: From location
Station coverage gap: 51°
Stations used: 46

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc86618 (also filed as ci711915, usp0002zex). Read Tue, Sep 22, 2026, 6:07 AM UTC.