California earthquakes

M3.2 earthquake 4km W of Grapevine, CA

A magnitude 3.2 earthquake struck 4km W of Grapevine, CA on Thu, Feb 23, 1939, 2:25 AM GMT-8 (10:25 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.8 10km NW of Frazier Park, CA. This one was a foreshock.

Frazier Park forecastMore in California

Map

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

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The earthquake

Magnitude
3.2 (ml), minor
Local time
UTC
1939-02-23 10:25:35 UTC
Depth
6.0 km (3.7 mi), shallow
Epicenter
34.946° N, 118.978° 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 2.0 km horizontally, 31.6 km in depth
Magnitude uncertainty
±0.06
Depth from
Operator assigned
Station coverage gap
254°, poorly surrounded by stations
Stations used
4

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 6 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3364906. Read Tue, Sep 29, 2026, 8:03 PM UTC.