Washington earthquakes

M4.8 earthquake 39 km NNE of Amboy, Washington

A magnitude 4.8 earthquake struck 39 km NNE of Amboy, Washington on Mon, Apr 21, 1980, 7:13 AM PST (15:13 UTC), -1 km (0 mi) below the surface.

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

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Map

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

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The earthquake

Magnitude: 4.8 (md), light
Local time: Mon, Apr 21, 1980, 7:13 AM PST
UTC: 1980-04-21 15:13:54 UTC
Depth: -0.7 km (-0.4 mi), shallow
Epicenter: 46.208° N, 122.174° 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 0.0 km horizontally, 0.1 km in depth
Magnitude uncertainty: ±0.13
Depth from: Operator assigned
Station coverage gap: 61°
Stations used: 16

Nearest places

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

Nearby

Within 100 km, magnitude 1.8 and up: 199 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 199.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10083803 (also filed as ushis3602, usp00016su). Read Tue, Sep 22, 2026, 7:51 PM UTC.