M1.6 earthquake 37 km S of Morton, Washington

A magnitude 1.6 earthquake struck 37 km S of Morton, Washington on Sun, Apr 5, 1981, 7:24 PM PST (03:24 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M2.2 37 km NNE of Amboy, 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: 85 in the 60 days after this one and 11 in the 30 days before it.

The first 60 of 85.

From the USGS Earthquake Hazards Program and its partner networks, event uw10099633. Read Mon, Sep 21, 2026, 3:15 PM UTC.