California earthquakes

M3.0 earthquake 2km SSE of Mentone, CA

A magnitude 3.0 earthquake struck 2km SSE of Mentone, CA on Mon, Jul 17, 1939, 8:58 PM GMT-8 (04:58 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.1 22km NW of Yucca Valley, CA. This one was a foreshock.

Mentone 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
3.0 (ml), micro
Local time
UTC
1939-07-18 04:58:39 UTC
Depth
6.0 km (3.7 mi), shallow
Epicenter
34.048° N, 117.125° 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 1.9 km horizontally, 17.2 km in depth
Magnitude uncertainty
±0.57
Depth from
Operator assigned
Station coverage gap
333°, 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: 18 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 2.52km ENE of Norco, CA · 31834 days ago · 6 km deep · 39 km away
  2. 1.72km N of Bellflower, CA · 31833 days ago · 6 km deep · 93 km away
  3. 2.01km N of Bellflower, CA · 31831 days ago · 6 km deep · 93 km away
  4. 2.411km ESE of Barstow, CA · 31831 days ago · 6 km deep · 92 km away
  5. 2.20km NW of Placentia, CA · 31829 days ago · 6 km deep · 72 km away
  6. 3.122km NW of Yucca Valley, CA · 31824 days ago · 6 km deep · 55 km away
  7. 2.19km SSE of Llano, CA · 31815 days ago · 6 km deep · 71 km away
  8. 2.03km NNW of Loma Linda, CA · 31812 days ago · 6 km deep · 13 km away
  9. 1.64km E of Norco, CA · 31807 days ago · 6 km deep · 38 km away
  10. 2.13km N of Home Gardens, CA · 31807 days ago · 6 km deep · 40 km away
  11. 2.76km N of Anza, CA · 31807 days ago · 6 km deep · 65 km away
  12. 2.79km N of Anza, CA · 31807 days ago · 6 km deep · 61 km away
  13. 2.52km NE of Costa Mesa, CA · 31801 days ago · 6 km deep · 82 km away
  14. 2.24km NW of San Joaquin Hills, CA · 31801 days ago · 6 km deep · 82 km away
  15. 2.725km N of Yucca Valley, CA · 31797 days ago · 6 km deep · 67 km away
  16. 3.030km NNW of Yucca Valley, CA · 31797 days ago · 6 km deep · 66 km away
  17. 2.114km N of Phelan, CA · 31791 days ago · 6 km deep · 70 km away
  18. 3.310km S of Joshua Tree, CA · 31789 days ago · 6 km deep · 77 km away

Before

  1. 2.73km NE of Garnet, CA · 31846 days ago · 6 km deep · 57 km away
  2. 3.610km WSW of Morongo Valley, CA · 31857 days ago · 6 km deep · 41 km away
  3. 2.36km WNW of Garnet, CA · 31857 days ago · 6 km deep · 50 km away
  4. 2.310km SSW of Anza, CA · 31873 days ago · 6 km deep · 75 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3365060. Read Tue, Sep 22, 2026, 11:22 AM UTC.