California earthquakes

M2.8 earthquake 13km WNW of Fallbrook, CA

A magnitude 2.8 earthquake struck 13km WNW of Fallbrook, CA on Sat, Sep 6, 1947, 8:48 AM GMT-8 (16:48 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.3 8km E of Cabazon, CA. This one was a foreshock.

Fallbrook 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
1947-09-06 16:48:46 UTC
Depth
6.0 km (3.7 mi), shallow
Epicenter
33.433° N, 117.378° 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 1.6 km horizontally, 31.6 km in depth
Magnitude uncertainty
±0.23
Depth from
Operator assigned
Station coverage gap
149°
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: 12 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 2.64km ENE of Nuevo, CA · 28870 days ago · 6 km deep · 49 km away
  2. 1.92km NE of Commerce, CA · 28866 days ago · 6 km deep · 96 km away
  3. 2.62km SSW of Buena Park, CA · 28865 days ago · 6 km deep · 74 km away
  4. 2.43km NE of Glen Avon, CA · 28861 days ago · 8 km deep · 67 km away
  5. 2.28km SSE of San Pedro, CA · 28860 days ago · 6 km deep · 86 km away
  6. 2.47km NNW of Idyllwild, CA · 28841 days ago · 6 km deep · 70 km away
  7. 2.74km NNW of Redlands, CA · 28835 days ago · 15 km deep · 75 km away
  8. 3.38km E of Cabazon, CA · 28834 days ago · 6 km deep · 83 km away
  9. 2.510km SSE of Avalon, CA · 28832 days ago · 6 km deep · 87 km away
  10. 2.54km ESE of Lake Arrowhead, CA · 28832 days ago · 6 km deep · 92 km away
  11. 2.49km SE of Julian, CA · 28813 days ago · 6 km deep · 91 km away
  12. 1.93km NW of Villa Park, CA · 28812 days ago · 6 km deep · 61 km away

Before

  1. 2.94km SW of Julian, CA · 28875 days ago · 6 km deep · 81 km away
  2. 2.43km SE of Fontana, CA · 28878 days ago · 0 km deep · 72 km away
  3. 3.18km ENE of Valle Vista, CA · 28880 days ago · 7 km deep · 65 km away
  4. 2.72km NNE of Placentia, CA · 28889 days ago · 7 km deep · 68 km away
  5. 3.13km S of Desert Hot Springs, CA · 28896 days ago · 6 km deep · 98 km away
  6. 2.811km E of Cabazon, CA · 28898 days ago · 6 km deep · 85 km away
  7. 2.68km ESE of Cabazon, CA · 28899 days ago · 6 km deep · 81 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3358164. Read Tue, Sep 22, 2026, 7:11 AM UTC.