M3.0 earthquake 3km E of Simi Valley, CA

A magnitude 3.0 earthquake struck 3km E of Simi Valley, CA on Fri, Feb 26, 2021, 12:51 PM PST (20:51 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M4.0 2km E of Lennox, 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
3.02	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.151 · 169 stations
2.8	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.034 · 116 stations

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

1,486 people reported to the USGS what they felt; the strongest reported shaking was IV, light 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: 102 in the 60 days after this one and 15 in the 30 days before it.

The first 60 of 102.

From the USGS Earthquake Hazards Program and its partner networks, event ci39803176 (also filed as us7000de0b). Read Sat, Oct 3, 2026, 8:23 AM UTC.