California earthquakes

M3.1 earthquake 4km WSW of Pasadena, CA

A magnitude 3.1 earthquake struck 4km WSW of Pasadena, CA on Mon, Jul 21, 1952, 6:56 AM GMT-7 (13:56 UTC), 18 km (11 mi) below the surface.

A larger quake followed: M3.2 4km NE of Moreno Valley, 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
3.1 (ml), minor
Local time
UTC
1952-07-21 13:56:00 UTC
Depth
18.0 km (11.2 mi), shallow
Epicenter
34.149° N, 118.170° 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.

Magnitude uncertainty
±0.05
Depth from
From location

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 2.72km W of Moreno Valley, CA · 27091 days ago · 0 km deep · 88 km away
  2. 2.72km WNW of Moreno Valley, CA · 27091 days ago · 6 km deep · 88 km away
  3. 2.06km S of Loma Linda, CA · 27091 days ago · 6 km deep · 86 km away
  4. 3.24km NE of Moreno Valley, CA · 27091 days ago · 6 km deep · 92 km away
  5. 2.96km NNE of Moreno Valley, CA · 27091 days ago · 6 km deep · 90 km away
  6. 2.03km NW of Moreno Valley, CA · 27091 days ago · 6 km deep · 88 km away
  7. 3.713km SSE of Tehachapi, CA · 27090 days ago · 6 km deep · 100 km away
  8. 2.42km SSE of Loma Linda, CA · 27072 days ago · 18 km deep · 85 km away
  9. 2.55km NW of Rancho Cucamonga, CA · 27062 days ago · 10 km deep · 50 km away
  10. 4.85km NNE of Acton, CA · 27058 days ago · 6 km deep · 40 km away
  11. 2.89km NNW of Acton, CA · 27058 days ago · 6 km deep · 44 km away
  12. 2.26km NNW of Acton, CA · 27058 days ago · 6 km deep · 42 km away
  13. 2.77km N of Fontana, CA · 27034 days ago · 8 km deep · 65 km away

Before

  1. 3.64km WSW of Pasadena, CA · 27091 days ago · 18 km deep · 0 km away
  2. 1.92km SSW of Artesia, CA · 27092 days ago · 6 km deep · 34 km away
  3. 2.129km SW of Rancho Palos Verdes, CA · 27093 days ago · 6 km deep · 77 km away
  4. 2.516km NW of Castaic, CA · 27095 days ago · 6 km deep · 72 km away
  5. 3.62km NNW of Maywood, CA · 27102 days ago · 5 km deep · 17 km away
  6. 2.74km NNE of Moreno Valley, CA · 27113 days ago · 14 km deep · 91 km away
  7. 2.04km ENE of San Pedro, CA · 27115 days ago · 0 km deep · 45 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3319147. Read Tue, Sep 22, 2026, 12:14 PM UTC.