Washington earthquakes

M3.0 earthquake 5 km N of Bangor Trident Base, Washington

A magnitude 3.0 earthquake struck 5 km N of Bangor Trident Base, Washington on Fri, Oct 29, 1971, 2:28 AM PDT (09:28 UTC), 54 km (34 mi) below the surface.

A larger quake followed: M4.1 1 km ENE of Mercer Island, Washington. This one was a foreshock.

Bangor Trident Base forecast More in Washington

Map

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

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The earthquake

Magnitude: 3.0 (md), minor
Local time: Fri, Oct 29, 1971, 2:28 AM PDT
UTC: 1971-10-29 09:28:24 UTC
Depth: 54.5 km (33.9 mi), shallow
Epicenter: 47.776° N, 122.718° 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 1.0 km horizontally, 1.0 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 153°
Stations used: 7

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 30 in the 60 days after this one and 14 in the 30 days before it.

After

Before

Earthquakes today Washington earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10851843. Read Wed, Sep 30, 2026, 8:26 AM UTC.