California earthquakes

M2.7 earthquake 9km N of Anza, CA

A magnitude 2.7 earthquake struck 9km N of Anza, CA on Wed, Aug 23, 1939, 6:24 AM GMT-8 (14:24 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.0 30km NNW of Yucca Valley, CA. This one was a foreshock.

Anza 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
2.7 (ml), micro
Local time
UTC
1939-08-23 14:24:58 UTC
Depth
6.0 km (3.7 mi), shallow
Epicenter
33.635° N, 116.691° 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 2.6 km horizontally, 31.6 km in depth
Magnitude uncertainty
±0.17
Depth from
Operator assigned
Station coverage gap
269°, 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: 12 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 2.725km N of Yucca Valley, CA · 31797 days ago · 6 km deep · 80 km away
  2. 3.030km NNW of Yucca Valley, CA · 31797 days ago · 6 km deep · 84 km away
  3. 3.310km S of Joshua Tree, CA · 31789 days ago · 6 km deep · 58 km away
  4. 2.44km W of Mead Valley, CA · 31782 days ago · 6 km deep · 64 km away
  5. 3.49km WNW of Garnet, CA · 31771 days ago · 6 km deep · 33 km away
  6. 2.611km ESE of Moreno Valley, CA · 31771 days ago · 11 km deep · 49 km away
  7. 2.85km WSW of Yucaipa, CA · 31771 days ago · 2 km deep · 57 km away
  8. 2.623km ESE of Anza, CA · 31766 days ago · 6 km deep · 29 km away
  9. 2.610km WNW of Morongo Valley, CA · 31766 days ago · 6 km deep · 51 km away
  10. 3.127km NNW of Yucca Valley, CA · 31757 days ago · 6 km deep · 79 km away
  11. 2.710km WSW of Twentynine Palms, CA · 31750 days ago · 6 km deep · 72 km away
  12. 2.414km WNW of Morongo Valley, CA · 31748 days ago · 6 km deep · 49 km away

Before

  1. 2.76km N of Anza, CA · 31807 days ago · 6 km deep · 4 km away
  2. 2.13km N of Home Gardens, CA · 31807 days ago · 6 km deep · 82 km away
  3. 1.64km E of Norco, CA · 31807 days ago · 6 km deep · 82 km away
  4. 3.313km SW of Borrego Springs, CA · 31810 days ago · 6 km deep · 55 km away
  5. 2.03km NNW of Loma Linda, CA · 31812 days ago · 6 km deep · 72 km away
  6. 3.122km NW of Yucca Valley, CA · 31824 days ago · 6 km deep · 70 km away
  7. 2.52km ENE of Norco, CA · 31834 days ago · 6 km deep · 84 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3365086. Read Tue, Sep 22, 2026, 11:15 AM UTC.