M3.1 earthquake 15 km E of Seven Trees, California

A magnitude 3.1 earthquake struck 15 km E of Seven Trees, California on Mon, Apr 29, 1985, 11:08 AM PDT (18:08 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.4 23 km ENE of Soledad, California. 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
3.1	ML, local (Richter)	Northern California Seismic System	Preferred · Final · 0 stations
3.1	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

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

Felt in the Morgan Hill area.

From the USGS event page for nc46932. 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: 109 in the 60 days after this one and 84 in the 30 days before it.

The first 60 of 109.

From the USGS Earthquake Hazards Program and its partner networks, event nc46932 (also filed as usp0002e9r). Read Thu, Oct 1, 2026, 7:42 PM UTC.