California earthquakes

M3.3 earthquake 14 km NE of Mesa, California

A magnitude 3.3 earthquake struck 14 km NE of Mesa, California on Sun, Sep 28, 1986, 11:17 PM PDT (06:17 UTC), 9 km (5 mi) below the surface.

A larger quake followed: M4.4 1 km E of Bishop, California. This one was a foreshock.

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

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The earthquake

Magnitude: 3.3 (md), minor
Local time: Sun, Sep 28, 1986, 11:17 PM PDT
UTC: 1986-09-29 06:17:31 UTC
Depth: 8.6 km (5.3 mi), shallow
Epicenter: 37.512° N, 118.435° 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, 0.5 km in depth
Magnitude uncertainty: ±0.20
Depth from: From location
Station coverage gap: 87°
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: at least 201 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 201.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc84101 (also filed as ci709956, usp0002ygf). Read Mon, Sep 28, 2026, 1:28 AM UTC.