California earthquakes

M3.9 earthquake 21 km NNE of Soledad, California

A magnitude 3.9 earthquake struck 21 km NNE of Soledad, California on Thu, May 22, 1975, 7:42 AM PDT (14:42 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.3 7 km SSE of Gustine, 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
3.9 (Md, duration), minor
Magnitude from
Northern California Seismic System
Local time
UTC
1975-05-22 14:42:30 UTC
Depth
7.1 km (4.4 mi), shallow
Epicenter
36.591° N, 121.200° W
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 0.2 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.24
Depth from
From location
Station coverage gap
60°
Stations used
33

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 190 in the 60 days after this one and 168 in the 30 days before it.

After

The first 60 of 190.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1023947. Read Fri, Oct 2, 2026, 9:25 AM UTC.