California earthquakes

M2.4 earthquake 14km WNW of Morongo Valley, CA

A magnitude 2.4 earthquake struck 14km WNW of Morongo Valley, CA on Sat, Oct 21, 1939, 1:59 AM GMT-8 (09:59 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M2.9 22km NNW of Yucca Valley, CA. This one was a foreshock.

Morongo Valley 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
2.4 (mh), micro
Local time
UTC
1939-10-21 09:59:47 UTC
Depth
6.0 km (3.7 mi), shallow
Epicenter
34.072° N, 116.736° 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 4.7 km horizontally, 31.6 km in depth
Magnitude uncertainty
±0.31
Depth from
Operator assigned
Station coverage gap
343°, poorly surrounded by stations
Stations used
3

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 2.39km E of Big Bear City, CA · 31746 days ago · 6 km deep · 20 km away
  2. 2.922km NNW of Yucca Valley, CA · 31745 days ago · 6 km deep · 31 km away
  3. 3.06km NE of Big Bear City, CA · 31735 days ago · 6 km deep · 25 km away
  4. 2.44km E of Big Bear City, CA · 31735 days ago · 6 km deep · 22 km away
  5. 4.52km SE of Loma Linda, CA · 31731 days ago · 17 km deep · 48 km away
  6. 2.94km SE of Grand Terrace, CA · 31727 days ago · 19 km deep · 51 km away
  7. 3.010km NNE of Borrego Springs, CA · 31725 days ago · 6 km deep · 89 km away
  8. 3.07km E of Yucaipa, CA · 31717 days ago · 6 km deep · 22 km away
  9. 3.05km ENE of Mecca, CA · 31702 days ago · 6 km deep · 85 km away
  10. 2.82km NNE of Calimesa, CA · 31699 days ago · 22 km deep · 29 km away
  11. 2.611km ENE of Mecca, CA · 31696 days ago · 6 km deep · 86 km away

Before

  1. 2.710km WSW of Twentynine Palms, CA · 31750 days ago · 6 km deep · 52 km away
  2. 3.127km NNW of Yucca Valley, CA · 31757 days ago · 6 km deep · 34 km away
  3. 2.610km WNW of Morongo Valley, CA · 31766 days ago · 6 km deep · 6 km away
  4. 2.623km ESE of Anza, CA · 31766 days ago · 6 km deep · 72 km away
  5. 2.315km WNW of Adelanto, CA · 31771 days ago · 6 km deep · 99 km away
  6. 2.85km WSW of Yucaipa, CA · 31771 days ago · 2 km deep · 34 km away
  7. 2.611km ESE of Moreno Valley, CA · 31771 days ago · 11 km deep · 40 km away
  8. 3.49km WNW of Garnet, CA · 31771 days ago · 6 km deep · 18 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3365130. Read Tue, Sep 22, 2026, 11:17 AM UTC.