M2.9 earthquake 4km SE of Granada Hills, CA

A magnitude 2.9 earthquake struck 4km SE of Granada Hills, CA on Mon, Aug 5, 1991, 3:53 AM PDT (10:53 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.3 4km ESE 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
2.89	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · 7 stations
2.9	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

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

Felt (IV) at Tujunga. Also felt at Panorama City and in the Van Nuys area.

From the USGS event page for ci2024946. 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: 100 in the 60 days after this one and 59 in the 30 days before it.

The first 60 of 100.

From the USGS Earthquake Hazards Program and its partner networks, event ci2024946 (also filed as usp0004v0w). Read Mon, Oct 5, 2026, 8:18 AM UTC.