California earthquakes

M3.0 earthquake 5km SSE of Simi Valley, CA

A magnitude 3.0 earthquake struck 5km SSE of Simi Valley, CA on Wed, Sep 21, 1949, 2:00 PM GMT-8 (22:00 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.5 2km SSE of Cypress, CA. This one was a foreshock.

Santa Susana 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), minor
Local time
UTC
1949-09-21 22:00:41 UTC
Depth
6.0 km (3.7 mi), shallow
Epicenter
34.230° N, 118.710° 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 3.8 km horizontally, 31.6 km in depth
Magnitude uncertainty
±0.02
Depth from
Operator assigned
Station coverage gap
288°, poorly surrounded by stations
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 6 in the 30 days before it.

After

  1. 2.46km NE of Simi Valley, CA · 28124 days ago · 6 km deep · 8 km away
  2. 2.111km SSE of San Pedro, CA · 28124 days ago · 6 km deep · 78 km away
  3. 2.918km SW of Malibu, CA · 28123 days ago · 6 km deep · 43 km away
  4. 2.36km N of Altadena, CA · 28095 days ago · 5 km deep · 54 km away
  5. 2.19km ESE of Yorba Linda, CA · 28087 days ago · 6 km deep · 100 km away
  6. 2.010km SSE of Chino Hills, CA · 28078 days ago · 6 km deep · 99 km away
  7. 2.34km ENE of Los Angeles, CA · 28075 days ago · 7 km deep · 50 km away
  8. 2.94km NE of Chatsworth, CA · 28074 days ago · 1 km deep · 14 km away
  9. 2.33km NNE of Chatsworth, CA · 28069 days ago · 12 km deep · 13 km away
  10. 3.52km SSE of Cypress, CA · 28067 days ago · 6 km deep · 79 km away

Before

  1. 3.22km NW of Bell Gardens, CA · 28127 days ago · 0 km deep · 58 km away
  2. 2.59km SW of Elizabeth Lake, CA · 28129 days ago · 5 km deep · 48 km away
  3. 3.336km NNW of Santa Barbara Is., CA · 28137 days ago · 6 km deep · 65 km away
  4. 2.719km S of Malibu Beach, CA · 28140 days ago · 6 km deep · 41 km away
  5. 3.011km S of San Pedro, CA · 28149 days ago · 6 km deep · 76 km away
  6. 2.12km W of Inglewood, CA · 28150 days ago · 18 km deep · 44 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3355521. Read Tue, Sep 22, 2026, 8:19 AM UTC.