California earthquakes

M2.5 earthquake 51 km W of Ferndale, California

A magnitude 2.5 earthquake struck 51 km W of Ferndale, California on Tue, Sep 21, 1982, 9:34 AM PDT (16:34 UTC), 31 km (20 mi) below the surface.

A larger quake followed: M2.5 138 km W of Ferndale, California. This one was a foreshock.

Ferndale forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude
2.5 (md), micro
Local time
UTC
1982-09-21 16:34:51 UTC
Depth
31.4 km (19.5 mi), shallow
Epicenter
40.565° N, 124.875° 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 20.0 km horizontally, 17.7 km in depth
Depth from
From location
Station coverage gap
323°, poorly surrounded by stations
Stations used
6

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 84 in the 60 days after this one and 75 in the 30 days before it.

After

The first 60 of 84.

Before

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1079263. Read Tue, Sep 22, 2026, 9:29 PM UTC.