California earthquakes

M2.2 earthquake 24 km NE of Greenfield, California

A magnitude 2.2 earthquake struck 24 km NE of Greenfield, California on Sun, Oct 12, 1986, 3:05 PM PDT (22:05 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.6 9 km NE of Morgan Hill, 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
2.2 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1986-10-12 22:05:42 UTC
Depth
5.3 km (3.3 mi), shallow
Epicenter
36.469° N, 121.045° 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 0.3 km horizontally, 0.6 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
107°
Stations used
34

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 185 in the 60 days after this one and 92 in the 30 days before it.

After

The first 60 of 185.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc85576. Read Thu, Oct 1, 2026, 8:36 PM UTC.