M2.1 earthquake 9km NNW of Anza, CA

A magnitude 2.1 earthquake struck 9km NNW of Anza, CA on Tue, Sep 21, 2021, 3:48 PM PDT (22:48 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M3.3 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.

2 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 109 in the 60 days after this one and 75 in the 30 days before it.

The first 60 of 109.

From the USGS Earthquake Hazards Program and its partner networks, event ci39815231. Read Sun, Oct 4, 2026, 4:12 PM UTC.