California earthquakes

M1.6 earthquake 1 km ENE of Round Valley, California

A magnitude 1.6 earthquake struck 1 km ENE of Round Valley, California on Fri, Sep 20, 1985, 10:36 PM PDT (05:36 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M2.3 California-Nevada border region. 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: Fri, Sep 20, 1985, 10:36 PM PDT
UTC: 1985-09-21 05:36:35 UTC
Depth: 9.9 km (6.2 mi), shallow
Epicenter: 37.426° N, 118.569° 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 0.5 km horizontally, 1.0 km in depth
Magnitude uncertainty: ±0.25
Depth from: From location
Station coverage gap: 171°
Stations used: 18

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 130 in the 60 days after this one and 68 in the 30 days before it.

After

The first 60 of 130.

Before

Earthquakes today California earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc55533. Read Tue, Sep 22, 2026, 8:55 PM UTC.