M4.0 earthquake 42km E of Trona, CA
A magnitude 4.0 earthquake struck 42km E of Trona, CA on Fri, Dec 29, 1939, 9:00 PM GMT-8 (05:00 UTC), 6 km (4 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.0 (ML, local (Richter)), minor
- Magnitude from
- Southern California Seismic Network
- Local time
- UTC
- 1939-12-30 05:00:47 UTC
- Depth
- 6.0 km (3.7 mi), shallow
- Epicenter
- 35.825° N, 116.917° 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 1.5 km horizontally, 31.6 km in depth
- Magnitude uncertainty
- ±0.09
- Depth from
- Operator assigned
- Station coverage gap
- 232°, 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: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 2.610km ENE of Barstow, CA · 31670 days ago · 6 km deep · 100 km away
- 2.415km ENE of Barstow, CA · 31669 days ago · 6 km deep · 96 km away
Before
Earthquakes todayCalifornia earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event ci3365183. Read Fri, Oct 2, 2026, 12:24 PM UTC.