M3.3 earthquake 74km E of Maneadero, B.C., MX

A magnitude 3.3 earthquake struck 74km E of Maneadero, B.C., MX on Fri, Sep 18, 1981, 4:50 AM PDT (11:50 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.8 76km SSW of Alberto Oviedo Mota, B.C., MX. 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
3.34	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.105 · 7 stations
3.3	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

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: 75 in the 60 days after this one and 34 in the 30 days before it.

The first 60 of 75.

From the USGS Earthquake Hazards Program and its partner networks, event ci523233 (also filed as usp0001fys). Read Sun, Oct 4, 2026, 9:54 PM UTC.