M2.6 earthquake 12km NNE of Simi Valley, CA

A magnitude 2.6 earthquake struck 12km NNE of Simi Valley, CA on Thu, Aug 1, 2002, 11:22 PM PDT (06:22 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M4.8 4km NE of Yorba Linda, 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
2.65	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.207 · 71 stations
2.6	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

The USGS’s account of the effects of this earthquake.

Felt at Simi Valley, Valencia, West Hills and Westlake Village.

From the USGS event page for ci9805513. U.S. Geological Survey text and figures are in the public domain.

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: 105 in the 60 days after this one and 42 in the 30 days before it.

The first 60 of 105.

From the USGS Earthquake Hazards Program and its partner networks, event ci9805513 (also filed as usp000b95g). Read Mon, Oct 5, 2026, 9:46 AM UTC.