M2.3 earthquake 8 km NNW of Onalaska, Washington

A magnitude 2.3 earthquake struck 8 km NNW of Onalaska, Washington on Sat, Aug 23, 1986, 10:07 PM PDT (05:07 UTC), 57 km (35 mi) below the surface.

A larger quake followed: M2.8 10 km NE of Ashford, Washington. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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: 158 in the 60 days after this one and 4 in the 30 days before it.

The first 60 of 158.

From the USGS Earthquake Hazards Program and its partner networks, event uw10212248. Read Tue, Sep 22, 2026, 3:49 PM UTC.