California earthquakes

M3.0 earthquake 20 km SSW of Ferndale, California

A magnitude 3.0 earthquake struck 20 km SSW of Ferndale, California on Mon, Jun 21, 1982, 4:40 AM PDT (11:40 UTC), 21 km (13 mi) below the surface.

A larger quake followed: M3.5 65 km WSW of Ferndale, 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
3.0 (md), micro
Local time
UTC
1982-06-21 11:40:33 UTC
Depth
20.7 km (12.9 mi), shallow
Epicenter
40.426° N, 124.394° 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 1.1 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
246°, poorly surrounded by stations
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: 106 in the 60 days after this one and 43 in the 30 days before it.

After

The first 60 of 106.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1075549. Read Tue, Sep 22, 2026, 5:24 PM UTC.