M1.7 earthquake 9km SW of Grapevine, CA

A magnitude 1.7 earthquake struck 9km SW of Grapevine, CA on Sat, Oct 28, 1978, 2:42 PM PDT (21:42 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M3.3 6km SW of Santa Barbara, 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: 90 in the 60 days after this one and 32 in the 30 days before it.

The first 60 of 90.

From the USGS Earthquake Hazards Program and its partner networks, event ci3313830. Read Thu, Oct 1, 2026, 10:44 AM UTC.