California earthquakes

M2.5 earthquake 23 km WNW of Three Rocks, California

A magnitude 2.5 earthquake struck 23 km WNW of Three Rocks, California on Tue, Aug 30, 1983, 12:20 PM PDT (19:20 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.5 11 km NE of Coalinga, California. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 2.5 (Md, duration), micro
Magnitude from: Northern California Seismic System
Local time: Tue, Aug 30, 1983, 12:20 PM PDT
UTC: 1983-08-30 19:20:07 UTC
Depth: 10.4 km (6.5 mi), shallow
Epicenter: 36.593° N, 120.627° 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 0.4 km horizontally, 1.3 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 74°
Stations used: 47

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 198 in the 60 days after this one and 198 in the 30 days before it.

After

The first 60 of 198.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1101580 (also filed as ci20998). Read Fri, Oct 2, 2026, 3:04 AM UTC.