M2.8 earthquake 6 km NE of Ridgemark, California

A magnitude 2.8 earthquake struck 6 km NE of Ridgemark, California on Wed, Feb 19, 1986, 4:35 PM PST (00:35 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M3.0 15 km NE of East Foothills, 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: 189 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 189.

From the USGS Earthquake Hazards Program and its partner networks, event nc66737 (also filed as usp0002r4q). Read Tue, Sep 22, 2026, 8:26 PM UTC.