M2.8 earthquake 2km ESE of Carson, CA

A magnitude 2.8 earthquake struck 2km ESE of Carson, CA on Fri, Sep 17, 2021, 11:06 PM PDT (06:06 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M3.6 3km WSW of East Los Angeles, CA. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
2.79	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.187 · 148 stations
2.7	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.046 · 62 stations

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

411 people reported to the USGS what they felt; the strongest reported shaking was V, moderate 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: 55 in the 60 days after this one and 29 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ci39812479 (also filed as us7000fcc0). Read Mon, Oct 5, 2026, 4:37 AM UTC.