M1.7 earthquake 18km S of Carpinteria, CA

A magnitude 1.7 earthquake struck 18km S of Carpinteria, CA on Wed, Apr 12, 1978, 4:17 PM PST (00:17 UTC), 11 km (7 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: 80 in the 60 days after this one and 120 in the 30 days before it.

The first 60 of 80.

From the USGS Earthquake Hazards Program and its partner networks, event ci3338787. Read Thu, Oct 1, 2026, 11:14 PM UTC.