M3.1 earthquake 59km SW of Progreso, B.C., MX

A magnitude 3.1 earthquake struck 59km SW of Progreso, B.C., MX on Wed, Jul 18, 1979, 11:51 AM PDT (18:51 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.4 1km SSE of Delta, 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
3.12	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.066 · 3 stations
3.0	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: 74 in the 60 days after this one and 29 in the 30 days before it.

The first 60 of 74.

From the USGS Earthquake Hazards Program and its partner networks, event ci3350728 (also filed as usp00011xe). Read Fri, Oct 2, 2026, 7:07 AM UTC.