California earthquakes

M3.1 earthquake 6km SW of Riverside, CA

A magnitude 3.1 earthquake struck 6km SW of Riverside, CA on Mon, May 29, 1939, 8:09 PM GMT-8 (04:09 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M3.6 10km WSW of Morongo Valley, CA. This one was a foreshock.

Riverside 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
3.1 (ml), minor
Local time
UTC
1939-05-30 04:09:18 UTC
Depth
0.0 km (0.0 mi), shallow
Epicenter
33.911° N, 117.440° 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 2.2 km horizontally, 5.9 km in depth
Magnitude uncertainty
±0.20
Depth from
From location
Station coverage gap
138°
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 11 in the 30 days before it.

After

  1. 2.119km SSW of Newport Beach, CA · 31884 days ago · 6 km deep · 74 km away
  2. 2.310km SSW of Anza, CA · 31873 days ago · 6 km deep · 84 km away
  3. 2.36km WNW of Garnet, CA · 31857 days ago · 6 km deep · 77 km away
  4. 3.610km WSW of Morongo Valley, CA · 31857 days ago · 6 km deep · 71 km away
  5. 3.533km SE of Avalon, CA · 31851 days ago · 6 km deep · 100 km away
  6. 2.73km NE of Garnet, CA · 31846 days ago · 6 km deep · 85 km away
  7. 3.02km SSE of Mentone, CA · 31843 days ago · 6 km deep · 33 km away
  8. 2.34km W of Inglewood, CA · 31839 days ago · 0 km deep · 88 km away
  9. 2.52km ENE of Norco, CA · 31834 days ago · 6 km deep · 9 km away
  10. 1.72km N of Bellflower, CA · 31833 days ago · 6 km deep · 63 km away

Before

  1. 2.115km SSW of Seal Beach, CA · 31894 days ago · 6 km deep · 74 km away
  2. 2.86km NW of Norco, CA · 31895 days ago · 6 km deep · 16 km away
  3. 2.14km WNW of Los Alamitos, CA · 31896 days ago · 6 km deep · 63 km away
  4. 2.12km WSW of Artesia, CA · 31897 days ago · 6 km deep · 62 km away
  5. 3.58km SW of Big Bear Lake, CA · 31898 days ago · 8 km deep · 53 km away
  6. 2.511km ENE of Trabuco Canyon, CA · 31905 days ago · 6 km deep · 23 km away
  7. 2.510km SW of Rancho Palos Verdes, CA · 31908 days ago · 6 km deep · 99 km away
  8. 2.14km SE of Los Alamitos, CA · 31909 days ago · 6 km deep · 58 km away
  9. 4.317km SE of Anza, CA · 31910 days ago · 6 km deep · 98 km away
  10. 2.21km SW of Placentia, CA · 31915 days ago · 6 km deep · 41 km away
  11. 2.44km S of Highland, CA · 31917 days ago · 6 km deep · 29 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3365018. Read Tue, Sep 22, 2026, 8:20 AM UTC.