California earthquakes

M6.1 earthquake 4 km NNW of Round Valley, California

A magnitude 6.1 earthquake struck 4 km NNW of Round Valley, California on Fri, Nov 23, 1984, 10:08 AM PST (18:08 UTC), 8 km (5 mi) below the surface.

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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: 6.1 (ml), strong
Local time: Fri, Nov 23, 1984, 10:08 AM PST
UTC: 1984-11-23 18:08:25 UTC
Depth: 8.1 km (5.0 mi), shallow
Epicenter: 37.460° N, 118.607° W
Region: California
Strongest shaking: VII, very strong shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: VII, very strong shaking
Peak ground acceleration: 30.9% of gravity
Peak ground velocity: 3.0 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

No one has reported feeling this quake to the USGS.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Landslide alert: Green
Liquefaction alert: Green

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.4 km horizontally, 0.8 km in depth
Depth from: From location
Station coverage gap: 66°
Stations used: 31

Nearest places

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

Nearby

Within 100 km, magnitude 3.1 and up: 145 in the 60 days after this one and 1 in the 30 days before it.

After

The first 60 of 145.

Before

3.213 km SW of Aspen Springs, CaliforniaMon, Oct 29, 9:58 AM PST · 15310 days ago · 1 km deep · 20 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc32321 (also filed as gcmtb112384c, ushis3869, usp00029bh, gcmt19841123180824, iscgem539737, atlas19841123180825, ci54514). Read Wed, Sep 30, 2026, 2:52 AM UTC.