M1.8 earthquake 20km S of Carpinteria, CA

A magnitude 1.8 earthquake struck 20km S of Carpinteria, CA on Wed, Mar 29, 1978, 4:41 PM PST (00:41 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M3.9 28km S of Port Hueneme, CA. 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: 138 in the 60 days after this one and 62 in the 30 days before it.

The first 60 of 138.

From the USGS Earthquake Hazards Program and its partner networks, event ci3338447. Read Thu, Oct 1, 2026, 11:44 AM UTC.