California earthquakes

M2.8 earthquake 6km NW of Norco, CA

A magnitude 2.8 earthquake struck 6km NW of Norco, CA on Sat, May 27, 1939, 6:49 AM GMT-8 (14:49 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.1 6km SW of Riverside, CA. This one was a foreshock.

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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
1939-05-27 14:49:02 UTC
Depth
6.0 km (3.7 mi), shallow
Epicenter
33.962° N, 117.601° 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 2.4 km horizontally, 13.1 km in depth
Magnitude uncertainty
±0.46
Depth from
Operator assigned
Station coverage gap
212°, 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: 10 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 2.115km SSW of Seal Beach, CA · 31895 days ago · 6 km deep · 64 km away
  2. 3.16km SW of Riverside, CA · 31892 days ago · 0 km deep · 16 km away
  3. 2.119km SSW of Newport Beach, CA · 31884 days ago · 6 km deep · 68 km away
  4. 2.310km SSW of Anza, CA · 31873 days ago · 6 km deep · 99 km away
  5. 2.36km WNW of Garnet, CA · 31857 days ago · 6 km deep · 92 km away
  6. 3.610km WSW of Morongo Valley, CA · 31857 days ago · 6 km deep · 85 km away
  7. 3.533km SE of Avalon, CA · 31851 days ago · 6 km deep · 97 km away
  8. 2.73km NE of Garnet, CA · 31846 days ago · 6 km deep · 100 km away
  9. 3.02km SSE of Mentone, CA · 31843 days ago · 6 km deep · 45 km away
  10. 2.34km W of Inglewood, CA · 31839 days ago · 0 km deep · 73 km away

Before

  1. 2.14km WNW of Los Alamitos, CA · 31896 days ago · 6 km deep · 50 km away
  2. 2.12km WSW of Artesia, CA · 31897 days ago · 6 km deep · 48 km away
  3. 3.58km SW of Big Bear Lake, CA · 31898 days ago · 8 km deep · 64 km away
  4. 2.511km ENE of Trabuco Canyon, CA · 31905 days ago · 6 km deep · 30 km away
  5. 2.510km SW of Rancho Palos Verdes, CA · 31908 days ago · 6 km deep · 86 km away
  6. 2.14km SE of Los Alamitos, CA · 31910 days ago · 6 km deep · 46 km away
  7. 2.21km SW of Placentia, CA · 31915 days ago · 6 km deep · 27 km away
  8. 2.44km S of Highland, CA · 31918 days ago · 6 km deep · 39 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3365014. Read Tue, Sep 22, 2026, 12:14 PM UTC.