California earthquakes

M4.4 earthquake 11km NNW of Grapevine, CA

A magnitude 4.4 earthquake struck 11km NNW of Grapevine, CA on Thu, Feb 23, 1939, 12:45 AM GMT-8 (08:45 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.6 9km WSW of Grapevine, 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
4.4 (ml), light
Local time
UTC
1939-02-23 08:45:50 UTC
Depth
6.0 km (3.7 mi), shallow
Epicenter
35.033° N, 118.988° 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 2.1 km horizontally, 31.6 km in depth
Magnitude uncertainty
±0.09
Depth from
Operator assigned
Station coverage gap
261°, poorly surrounded by stations
Stations used
5

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 3.010km WNW of Grapevine, CA · 31988 days ago · 6 km deep · 7 km away
  2. 4.69km WSW of Grapevine, CA · 31988 days ago · 6 km deep · 15 km away
  3. 3.36km WNW of Grapevine, CA · 31988 days ago · 6 km deep · 7 km away
  4. 2.912km NNW of Grapevine, CA · 31988 days ago · 6 km deep · 1 km away
  5. 3.24km W of Grapevine, CA · 31988 days ago · 6 km deep · 10 km away
  6. 3.810km NW of Frazier Park, CA · 31975 days ago · 6 km deep · 18 km away
  7. 2.67km W of Grapevine, CA · 31975 days ago · 6 km deep · 10 km away
  8. 2.715km WSW of Lake Hughes, CA · 31972 days ago · 6 km deep · 59 km away
  9. 2.311km WNW of Neenach, CA · 31945 days ago · 6 km deep · 35 km away
  10. 2.52km SSE of Grapevine, CA · 31937 days ago · 6 km deep · 14 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3364901 (also filed as ushis1239). Read Tue, Sep 22, 2026, 7:07 AM UTC.