M1.8 earthquake 38 km NNE of Amboy, Washington

A magnitude 1.8 earthquake struck 38 km NNE of Amboy, Washington on Tue, May 21, 1985, 10:25 PM PDT (05:25 UTC), -2 km (-1 mi) below the surface.

A larger quake followed: M3.2 30 km SW of White Swan, 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: at least 202 in the 60 days after this one and 31 in the 30 days before it.

The first 60 of at least 202.

From the USGS Earthquake Hazards Program and its partner networks, event uw10192123. Read Sun, Sep 27, 2026, 5:16 AM UTC.