California earthquakes

M2.1 earthquake 13 km NE of Phillipsville, California

A magnitude 2.1 earthquake struck 13 km NE of Phillipsville, California on Wed, Apr 12, 1978, 12:08 AM PST (08:08 UTC), 22 km (14 mi) below the surface.

A larger quake followed: M4.6 32 km SW 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: 2.1 (md), micro
Local time: Wed, Apr 12, 1978, 12:08 AM PST
UTC: 1978-04-12 08:08:30 UTC
Depth: 22.5 km (14.0 mi), shallow
Epicenter: 40.301° N, 123.688° 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 4.0 km horizontally, 0.9 km in depth
Depth from: From location
Station coverage gap: 301°, poorly surrounded by stations
Stations used: 8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 99 in the 60 days after this one and 99 in the 30 days before it.

After

The first 60 of 99.

Before

Earthquakes today California earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1039814. Read Sat, Sep 26, 2026, 4:15 PM UTC.