M2.8 earthquake 13km NNW of Castaic, CA
A magnitude 2.8 earthquake struck 13km NNW of Castaic, CA on Sun, Oct 1, 1939, 5:03 AM GMT-8 (13:03 UTC), 6 km (4 mi) below the surface.
A larger quake followed: M3.3 13km ENE of Maricopa, CA. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.8 (ml), micro
- Local time
- UTC
- 1939-10-01 13:03:24 UTC
- Depth
- 6.0 km (3.7 mi), shallow
- Epicenter
- 34.597° N, 118.680° 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 3.3 km horizontally, 31.6 km in depth
- Magnitude uncertainty
- ±0.18
- Depth from
- Operator assigned
- Station coverage gap
- 342°, 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: 8 in the 60 days after this one and 2 in the 30 days before it.
After
- 2.212km N of Castaic, CA · 31753 days ago · 6 km deep · 6 km away
- 3.313km ENE of Maricopa, CA · 31752 days ago · 6 km deep · 78 km away
- 2.613km ENE of Maricopa, CA · 31752 days ago · 6 km deep · 76 km away
- 2.513km N of Castaic, CA · 31749 days ago · 6 km deep · 5 km away
- 2.310km NNW of Castaic, CA · 31740 days ago · 6 km deep · 3 km away
- 1.92km WNW of Hawthorne, CA · 31738 days ago · 6 km deep · 80 km away
- 2.46km NNW of Santa Monica, CA · 31733 days ago · 3 km deep · 60 km away
- 2.13km SSW of Palos Verdes Estates, CA · 31716 days ago · 6 km deep · 95 km away
Before
Earthquakes todayCalifornia earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event ci3365113. Read Wed, Sep 30, 2026, 3:07 PM UTC.