M1.5 earthquake 20km S of Trona, CA

A magnitude 1.5 earthquake struck 20km S of Trona, CA on Thu, Sep 16, 2021, 11:53 PM PDT (06:53 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M4.0 15km ESE of Olancha, 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: 154 in the 60 days after this one and 76 in the 30 days before it.

The first 60 of 154.

From the USGS Earthquake Hazards Program and its partner networks, event ci39811535. Read Sun, Oct 4, 2026, 5:51 AM UTC.