Alaska earthquakes

M1.8 earthquake 128 km WSW of Adak, Alaska

A magnitude 1.8 earthquake struck 128 km WSW of Adak, Alaska on Sat, Feb 27, 2021, 1:22 AM HAST (11:22 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M5.4 185 km WSW of Adak, Alaska. This one was a foreshock.

Map

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

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The earthquake

Magnitude: 1.8 (ml), micro
Local time: Sat, Feb 27, 2021, 1:22 AM HAST
UTC: 2021-02-27 11:22:05 UTC
Depth: 13.2 km (8.2 mi), shallow
Epicenter: 51.629° N, 178.451° 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: 24

Nearby

Within 100 km, magnitude 1.5 and up: 115 in the 60 days after this one and 76 in the 30 days before it.

After

The first 60 of 115.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak0212o3umis (also filed as av91198361). Read Sun, Sep 27, 2026, 12:07 PM UTC.