California earthquakes

M4.1 earthquake 10 km W of Philo, California

A magnitude 4.1 earthquake struck 10 km W of Philo, California on Fri, Sep 14, 1984, 2:10 AM PDT (09:10 UTC), 14 km (9 mi) below the surface.

A larger quake followed: M4.3 11 km ENE of Clearlake, 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
4.1 (ml), light
Local time
UTC
1984-09-14 09:10:09 UTC
Depth
13.8 km (8.6 mi), shallow
Epicenter
39.053° N, 123.561° 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 27.1 km horizontally, 8.0 km in depth
Depth from
From location
Station coverage gap
175°
Stations used
7

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 146 in the 60 days after this one and 73 in the 30 days before it.

After

The first 60 of 146.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1120217. Read Wed, Sep 30, 2026, 7:52 AM UTC.