M2.6 earthquake 6 km SW of Molalla, Oregon

A magnitude 2.6 earthquake struck 6 km SW of Molalla, Oregon on Thu, Jun 20, 1991, 6:07 PM PDT (01:07 UTC), 28 km (18 mi) below the surface.

A larger quake followed: M3.5 8 km N of Bethany, Oregon. 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
2.6	Md, duration	Pacific Northwest Seismic Network	Preferred · Final · ±0.05 · 20 stations
2.6	Md, duration	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: 21 in the 60 days after this one and 0 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event uw10278528 (also filed as usp0004t7m). Read Fri, Oct 2, 2026, 10:10 AM UTC.