M1.7 earthquake 9 km SSW of Ridgemark, California

A magnitude 1.7 earthquake struck 9 km SSW of Ridgemark, California on Sun, Sep 26, 1982, 10:22 PM PDT (05:22 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.3 15 km SSE of Tres Pinos, 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: 184 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 184.

From the USGS Earthquake Hazards Program and its partner networks, event nc1079616. Read Tue, Sep 22, 2026, 9:28 PM UTC.