California earthquakes

M2.5 earthquake 7km WSW of Devore, CA

A magnitude 2.5 earthquake struck 7km WSW of Devore, CA on Thu, Apr 21, 1955, 2:28 AM GMT-8 (10:28 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M3.1 10km NE of Mentone, 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
2.5 (ml), micro
Local time
UTC
1955-04-21 10:28:58 UTC
Depth
4.1 km (2.5 mi), shallow
Epicenter
34.194° N, 117.473° 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 1.0 km horizontally, 1.6 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
113°
Stations used
7

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 2.32km WNW of Fontana, CA · 26072 days ago · 3 km deep · 10 km away
  2. 2.37km SW of Adelanto, CA · 26068 days ago · 6 km deep · 39 km away
  3. 3.110km NE of Mentone, CA · 26065 days ago · 0 km deep · 39 km away
  4. 3.93km NW of Fontana, CA · 26064 days ago · 4 km deep · 8 km away
  5. 2.98km ENE of Big Bear City, CA · 26056 days ago · 2 km deep · 67 km away
  6. 3.19km ENE of Big Bear City, CA · 26053 days ago · 6 km deep · 68 km away
  7. 2.72km ESE of La Puente, CA · 26041 days ago · 12 km deep · 47 km away

Before

  1. 2.811km SW of Lucerne Valley, CA · 26098 days ago · 0 km deep · 43 km away
  2. 2.437km NNW of Joshua Tree, CA · 26100 days ago · 6 km deep · 99 km away
  3. 2.64km SW of Lake View Terrace, CA · 26106 days ago · 24 km deep · 85 km away
  4. 3.12km NE of Loma Linda, CA · 26107 days ago · 17 km deep · 25 km away
  5. 2.74km SE of Placentia, CA · 26107 days ago · 6 km deep · 51 km away
  6. 2.95km WSW of Devore, CA · 26108 days ago · 3 km deep · 2 km away
  7. 2.84km SE of Loma Linda, CA · 26109 days ago · 15 km deep · 29 km away
  8. 2.33km WNW of Newport Beach, CA · 26115 days ago · 6 km deep · 77 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3297789. Read Thu, Sep 24, 2026, 3:55 AM UTC.