California earthquakes

M1.6 earthquake 18 km NW of Benton, California

A magnitude 1.6 earthquake struck 18 km NW of Benton, California on Wed, Aug 21, 1985, 7:42 PM PDT (02:42 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M1.8 2 km NNW of Mesa, 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
1.6 (md), micro
Local time
UTC
1985-08-22 02:42:18 UTC
Depth
7.0 km (4.3 mi), shallow
Epicenter
37.946° N, 118.610° 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, 2.0 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
85°
Stations used
13

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 155 in the 60 days after this one and 43 in the 30 days before it.

After

The first 60 of 155.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc53517. Read Tue, Sep 22, 2026, 3:38 PM UTC.