M1.9 earthquake Central California

A magnitude 1.9 earthquake struck in Central California on Sun, Aug 20, 1989, 11:29 PM PDT (06:29 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M6.9 The 1989 Loma Prieta, California Earthquake. 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: 175 in the 60 days after this one and 84 in the 30 days before it.

The first 60 of 175.

From the USGS Earthquake Hazards Program and its partner networks, event nc142669. Read Fri, Oct 2, 2026, 3:08 PM UTC.