M3.5 earthquake 23km ESE of Anza, CA

A magnitude 3.5 earthquake struck 23km ESE of Anza, CA on Thu, Mar 25, 1937, 9:47 AM GMT-8 (17:47 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.6 7km SE of Thousand Palms, 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: 51 in the 60 days after this one and 14 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ci3364166. Read Tue, Sep 22, 2026, 9:43 AM UTC.