California earthquakes

M2.9 earthquake 16 km NNE of Mesa, California

A magnitude 2.9 earthquake struck 16 km NNE of Mesa, California on Sun, Jul 20, 1986, 9:16 AM PDT (16:16 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M6.4 The 1986 Chalfant Valley, California Earthquake. 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
2.9 (md), micro
Local time
UTC
1986-07-20 16:16:16 UTC
Depth
9.5 km (5.9 mi), shallow
Epicenter
37.555° N, 118.456° 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 0.2 km horizontally, 0.6 km in depth
Magnitude uncertainty
±0.20
Depth from
From location
Station coverage gap
50°
Stations used
37

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 202 in the 60 days after this one and 180 in the 30 days before it.

After

The first 60 of at least 202.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc100494 (also filed as ci703483). Read Tue, Sep 29, 2026, 10:52 PM UTC.