M1.5 earthquake 11km WSW of Grapevine, CA

A magnitude 1.5 earthquake struck 11km WSW of Grapevine, CA on Mon, Mar 27, 1978, 2:35 PM PST (22:35 UTC), 16 km (10 mi) below the surface.

A larger quake followed: M3.1 15km WNW of Malibu, 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: 153 in the 60 days after this one and 47 in the 30 days before it.

The first 60 of 153.

From the USGS Earthquake Hazards Program and its partner networks, event ci3338378. Read Thu, Oct 1, 2026, 5:07 PM UTC.