Washington earthquakes

M4.6 earthquake 38 km S of Morton, Washington

A magnitude 4.6 earthquake struck 38 km S of Morton, Washington on Mon, Apr 28, 1980, 11:22 PM PDT (06:22 UTC), -1 km (-1 mi) below the surface.

A larger quake followed: M5.7 38 km NNE of Amboy, Washington. This one was a foreshock.

Morton forecast More in Washington

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

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The earthquake

Magnitude: 4.6 (md), light
Local time: Mon, Apr 28, 1980, 11:22 PM PDT
UTC: 1980-04-29 06:22:38 UTC
Depth: -0.9 km (-0.5 mi), shallow
Epicenter: 46.216° N, 122.183° W
Region: Washington
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.1 km horizontally, 0.1 km in depth
Magnitude uncertainty: ±0.08
Depth from: Operator assigned
Station coverage gap: 73°
Stations used: 16

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.6 and up: 199 in the 60 days after this one and 199 in the 30 days before it.

After

The first 60 of 199.

Before

Earthquakes today Washington earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10087848 (also filed as ushis3610, usp00016ya). Read Sat, Sep 26, 2026, 7:31 PM UTC.