M2.5 earthquake 68km SSE of San Clemente Is. (SE tip), CA
A magnitude 2.5 earthquake struck 68km SSE of San Clemente Is. (SE tip), CA on Thu, Oct 6, 1983, 10:21 PM PDT (05:21 UTC), 6 km (4 mi) below the surface.
A larger quake followed: M3.3 33km WSW of Coronado, CA. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.5 (Mc), micro
- Magnitude from
- Southern California Seismic Network
- Local time
- UTC
- 1983-10-07 05:21:45 UTC
- Depth
- 5.8 km (3.6 mi), shallow
- Epicenter
- 32.243° N, 118.120° 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 3.8 km horizontally, 31.6 km in depth
- Depth from
- Operator assigned
- Station coverage gap
- 41°
- Stations used
- 10
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 0 in the 30 days before it.
After
- 2.573km SSE of San Clemente Is. (SE tip), CA · 15702 days ago · 6 km deep · 18 km away
- 2.658km W of Rosarito, B.C., MX · 15700 days ago · 6 km deep · 45 km away
- 3.333km WSW of Coronado, CA · 15693 days ago · 5 km deep · 68 km away
- 2.210km SW of La Jolla, CA · 15688 days ago · 5 km deep · 94 km away
- 2.842km SW of Primo Tapia, B.C., MX · 15679 days ago · 6 km deep · 91 km away
- 1.838km WSW of Encinitas, CA · 15659 days ago · 5 km deep · 87 km away
- 2.546km SW of San Clemente, CA · 15651 days ago · 6 km deep · 96 km away
- 1.947km E of San Clemente Is. (SE tip), CA · 15649 days ago · 6 km deep · 71 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event ci17536. Read Sat, Oct 3, 2026, 2:30 PM UTC.