M1.7 earthquake 6 km NE of Ridgemark, California

A magnitude 1.7 earthquake struck 6 km NE of Ridgemark, California on Sat, Mar 1, 1986, 11:51 AM PST (19:51 UTC), 6 km (3 mi) below the surface.

A larger quake followed: M2.0 5 km NNE 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: 187 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 187.

From the USGS Earthquake Hazards Program and its partner networks, event nc67282. Read Tue, Sep 22, 2026, 8:27 PM UTC.