California earthquakes

M2.7 earthquake 6 km E of Williams, California

A magnitude 2.7 earthquake struck 6 km E of Williams, California on Sat, Jun 15, 1985, 9:11 PM PDT (04:11 UTC), 17 km (10 mi) below the surface.

A larger quake followed: M4.3 12 km WSW of Kelseyville, California. This one was a foreshock.

Williams 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
2.7 (md), micro
Local time
UTC
1985-06-16 04:11:14 UTC
Depth
16.8 km (10.4 mi), shallow
Epicenter
39.164° N, 122.070° 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 0.5 km horizontally, 1.0 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
117°
Stations used
20

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 172 in the 60 days after this one and 133 in the 30 days before it.

After

The first 60 of 172.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc49578. Read Mon, Sep 28, 2026, 2:16 PM UTC.