California earthquakes

M1.6 earthquake 20 km SSW of Three Rocks, California

A magnitude 1.6 earthquake struck 20 km SSW of Three Rocks, California on Thu, Mar 22, 1984, 10:18 PM PST (06:18 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M2.3 10 km ENE of Coalinga, California. This one was a foreshock.

Coalinga forecast More in California

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: Thu, Mar 22, 1984, 10:18 PM PST
UTC: 1984-03-23 06:18:49 UTC
Depth: 11.5 km (7.2 mi), shallow
Epicenter: 36.342° N, 120.495° 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, 0.3 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 142°
Stations used: 15

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 nc11720 (also filed as ci34505). Read Tue, Sep 22, 2026, 8:46 PM UTC.