Alaska earthquakes

M1.8 earthquake 166 km W of Adak, Alaska

A magnitude 1.8 earthquake struck 166 km W of Adak, Alaska on Tue, Apr 27, 2021, 12:12 PM HADT (21:12 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M4.2 122 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 1.8 (ml), micro
Local time: Tue, Apr 27, 2021, 12:12 PM HADT
UTC: 2021-04-27 21:12:30 UTC
Depth: 10.7 km (6.6 mi), shallow
Epicenter: 51.765° N, 179.035° 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.

Stations used: 19

Nearby

Within 100 km, magnitude 1.5 and up: 52 in the 60 days after this one and 44 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak0215dugclw (also filed as av91228976). Read Sun, Sep 27, 2026, 9:50 AM UTC.