M1.8 earthquake 21 km SW of Three Rocks, California

A magnitude 1.8 earthquake struck 21 km SW of Three Rocks, California on Sat, Apr 12, 1980, 7:58 PM PST (03:58 UTC), 15 km (10 mi) below the surface.

A larger quake followed: M4.7 7 km SSE of San Juan Bautista, California. This one was a foreshock.

Map

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

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 176 in the 60 days after this one and 69 in the 30 days before it.

The first 60 of 176.

From the USGS Earthquake Hazards Program and its partner networks, event nc1052102. Read Sun, Oct 4, 2026, 5:06 PM UTC.