California earthquakes

M1.6 earthquake 9 km WSW of Round Valley, California

A magnitude 1.6 earthquake struck 9 km WSW of Round Valley, California on Sun, Mar 17, 1985, 11:34 PM PST (07:34 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M1.6 6 km WNW of Round Valley, 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: Sun, Mar 17, 1985, 11:34 PM PST
UTC: 1985-03-18 07:34:00 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 37.389° N, 118.687° 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 0.3 km horizontally, 0.5 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 127°
Stations used: 30

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc44147 (also filed as ci62714). Read Tue, Sep 22, 2026, 9:40 PM UTC.