California earthquakes

M2.8 earthquake 22km ESE of Anza, CA

A magnitude 2.8 earthquake struck 22km ESE of Anza, CA on Thu, Mar 23, 1939, 9:37 AM GMT-8 (17:37 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M2.9 19km NNE of Indio, 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
2.8 (ml), micro
Local time
UTC
1939-03-23 17:37:57 UTC
Depth
6.0 km (3.7 mi), shallow
Epicenter
33.455° N, 116.475° 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 3.0 km horizontally, 31.6 km in depth
Magnitude uncertainty
±0.14
Depth from
Operator assigned
Station coverage gap
283°, 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: 10 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 2.71km SSE of Moreno Valley, CA · 31955 days ago · 14 km deep · 86 km away
  2. 2.44km E of Morongo Valley, CA · 31954 days ago · 6 km deep · 66 km away
  3. 2.83km W of Morongo Valley, CA · 31954 days ago · 6 km deep · 67 km away
  4. 2.919km NNE of Indio, CA · 31951 days ago · 6 km deep · 57 km away
  5. 2.43km ESE of Running Springs, CA · 31947 days ago · 6 km deep · 100 km away
  6. 2.74km WNW of Aguanga, CA · 31929 days ago · 6 km deep · 39 km away
  7. 2.44km S of Highland, CA · 31918 days ago · 6 km deep · 98 km away
  8. 4.317km SE of Anza, CA · 31910 days ago · 6 km deep · 5 km away
  9. 2.511km ENE of Trabuco Canyon, CA · 31905 days ago · 6 km deep · 97 km away
  10. 2.84km SSE of North Shore, CA · 31900 days ago · 6 km deep · 51 km away

Before

  1. 2.723km ENE of Campo, CA · 31961 days ago · 6 km deep · 88 km away
  2. 2.715km WNW of Morongo Valley, CA · 31962 days ago · 6 km deep · 75 km away
  3. 2.718km NW of Yucca Valley, CA · 31962 days ago · 6 km deep · 87 km away
  4. 3.517km NW of Yucca Valley, CA · 31981 days ago · 6 km deep · 84 km away
  5. 2.911km NNE of Julian, CA · 31984 days ago · 6 km deep · 33 km away
  6. 3.35km WSW of Niland, CA · 31985 days ago · 6 km deep · 89 km away
  7. 2.619km NNE of Indio, CA · 31987 days ago · 6 km deep · 57 km away
  8. 2.55km N of Ocotillo Wells, CA · 31988 days ago · 6 km deep · 43 km away
  9. 2.921km SW of Ocotillo, CA · 31990 days ago · 6 km deep · 98 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3364932. Read Tue, Sep 22, 2026, 12:13 PM UTC.