M2.4 earthquake 6km NE of Simi Valley, CA
A magnitude 2.4 earthquake struck 6km NE of Simi Valley, CA on Wed, Sep 21, 1949, 5:04 PM GMT-8 (01:04 UTC), 6 km (4 mi) below the surface.
A larger quake followed: M2.9 18km SW of Malibu, CA. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.4 (ml), micro
- Local time
- UTC
- 1949-09-22 01:04:23 UTC
- Depth
- 6.0 km (3.7 mi), shallow
- Epicenter
- 34.304° N, 118.695° W
- Region
- California
- 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 4.8 km horizontally, 31.6 km in depth
- Magnitude uncertainty
- ±0.14
- Depth from
- Operator assigned
- Station coverage gap
- 349°, 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: 7 in the 60 days after this one and 7 in the 30 days before it.
After
- 2.111km SSE of San Pedro, CA · 28124 days ago · 6 km deep · 84 km away
- 2.918km SW of Malibu, CA · 28123 days ago · 6 km deep · 51 km away
- 2.36km N of Altadena, CA · 28095 days ago · 5 km deep · 53 km away
- 2.34km ENE of Los Angeles, CA · 28075 days ago · 7 km deep · 52 km away
- 2.94km NE of Chatsworth, CA · 28074 days ago · 1 km deep · 11 km away
- 2.33km NNE of Chatsworth, CA · 28069 days ago · 12 km deep · 10 km away
- 3.52km SSE of Cypress, CA · 28067 days ago · 6 km deep · 83 km away
Before
- 3.05km SSE of Simi Valley, CA · 28125 days ago · 6 km deep · 8 km away
- 3.22km NW of Bell Gardens, CA · 28127 days ago · 0 km deep · 61 km away
- 2.59km SW of Elizabeth Lake, CA · 28129 days ago · 5 km deep · 40 km away
- 3.336km NNW of Santa Barbara Is., CA · 28137 days ago · 6 km deep · 72 km away
- 2.719km S of Malibu Beach, CA · 28140 days ago · 6 km deep · 49 km away
- 3.011km S of San Pedro, CA · 28149 days ago · 6 km deep · 83 km away
- 2.12km W of Inglewood, CA · 28150 days ago · 18 km deep · 49 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event ci3355522. Read Tue, Sep 22, 2026, 10:17 AM UTC.