M2.3 earthquake 10km SSW of Anza, CA
A magnitude 2.3 earthquake struck 10km SSW of Anza, CA on Sun, Jun 18, 1939, 3:42 AM GMT-8 (11:42 UTC), 6 km (4 mi) below the surface.
A larger quake followed: M3.6 10km WSW of Morongo Valley, CA. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.3 (ML, local (Richter)), micro
- Magnitude from
- Southern California Seismic Network
- Local time
- UTC
- 1939-06-18 11:42:14 UTC
- Depth
- 6.0 km (3.7 mi), shallow
- Epicenter
- 33.468° N, 116.710° 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 2.8 km horizontally, 31.6 km in depth
- Magnitude uncertainty
- ±0.08
- Depth from
- Operator assigned
- Station coverage gap
- 264°, poorly surrounded by stations
- Stations used
- 4
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 5 in the 30 days before it.
After
- 2.36km WNW of Garnet, CA · 31868 days ago · 6 km deep · 51 km away
- 3.610km WSW of Morongo Valley, CA · 31868 days ago · 6 km deep · 60 km away
- 2.73km NE of Garnet, CA · 31857 days ago · 6 km deep · 53 km away
- 3.02km SSE of Mentone, CA · 31855 days ago · 6 km deep · 75 km away
- 2.52km ENE of Norco, CA · 31845 days ago · 6 km deep · 92 km away
- 3.122km NW of Yucca Valley, CA · 31835 days ago · 6 km deep · 89 km away
Before
- 2.714km N of Borrego Springs, CA · 31903 days ago · 6 km deep · 32 km away
- 3.16km SW of Riverside, CA · 31904 days ago · 0 km deep · 84 km away
- 2.86km NW of Norco, CA · 31906 days ago · 6 km deep · 99 km away
- 3.58km SW of Big Bear Lake, CA · 31909 days ago · 8 km deep · 83 km away
- 2.84km SSE of North Shore, CA · 31911 days ago · 6 km deep · 73 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event ci3365031. Read Sat, Oct 3, 2026, 4:50 PM UTC.