California earthquakes

M2.3 earthquake 30 km WNW of Three Rocks, California

A magnitude 2.3 earthquake struck 30 km WNW of Three Rocks, California on Fri, Mar 11, 1977, 10:03 PM PST (06:03 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M3.6 8 km NW of Hollister, California. This one was a foreshock.

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

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The earthquake

Magnitude: 2.3 (Md, duration), micro
Magnitude from: Northern California Seismic System
Local time: Fri, Mar 11, 1977, 10:03 PM PST
UTC: 1977-03-12 06:03:26 UTC
Depth: 11.5 km (7.2 mi), shallow
Epicenter: 36.569° N, 120.722° 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, 0.4 km in depth
Magnitude uncertainty: ±0.62
Depth from: From location
Station coverage gap: 169°
Stations used: 14

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 186 in the 60 days after this one and 147 in the 30 days before it.

After

The first 60 of 186.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1034344. Read Sat, Oct 3, 2026, 6:58 AM UTC.