Alaska earthquakes

M3.4 earthquake 151 km SSE of Adak, Alaska

A magnitude 3.4 earthquake struck 151 km SSE of Adak, Alaska on Thu, Feb 12, 1981, 11:57 PM GMT-11 (10:57 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.9 Andreanof Islands, Aleutian Islands, Alaska. This one was a foreshock.

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The earthquake

Magnitude
3.4 (ml), minor
Local time
UTC
1981-02-13 10:57:31 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
50.556° N, 176.074° W
Region
Alaska
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.

Depth from
OPERATOR_ASSIGNED

Nearby

Within 100 km, magnitude 1.5 and up: 1 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 4.9Andreanof Islands, Aleutian Islands, Alaska · 16644 days ago · 33 km deep · 17 km away

Before

  1. 5.7Andreanof Islands, Aleutian Islands, Alaska · 16665 days ago · 33 km deep · 45 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0001c5b. Read Tue, Sep 22, 2026, 4:16 AM UTC.