M2.0 earthquake 11 km E of Blackhawk, California

A magnitude 2.0 earthquake struck 11 km E of Blackhawk, California on Wed, Feb 25, 1981, 11:53 PM PST (07:53 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M2.6 14 km SSE of Livermore, 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: 93 in the 60 days after this one and 47 in the 30 days before it.

The first 60 of 93.

From the USGS Earthquake Hazards Program and its partner networks, event nc1060771. Read Tue, Sep 22, 2026, 10:52 AM UTC.