M1.7 earthquake 16km SW of Ferndale, CA

A magnitude 1.7 earthquake struck 16km SW of Ferndale, CA on Wed, Jul 21, 2021, 3:45 AM PDT (10:45 UTC), 25 km (16 mi) below the surface.

A larger quake followed: M4.5 10km SW of Petrolia, 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: 74 in the 60 days after this one and 28 in the 30 days before it.

The first 60 of 74.

From the USGS Earthquake Hazards Program and its partner networks, event nc73596756. Read Sun, Oct 4, 2026, 10:55 AM UTC.