M1.6 earthquake 3km S of Mentone, CA

A magnitude 1.6 earthquake struck 3km S of Mentone, CA on Thu, Aug 5, 2021, 5:20 PM PDT (00:20 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M3.4 10km NNW of Anza, 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: 106 in the 60 days after this one and 57 in the 30 days before it.

The first 60 of 106.

From the USGS Earthquake Hazards Program and its partner networks, event ci39765255. Read Sun, Oct 4, 2026, 9:37 AM UTC.