Alaska earthquakes

M3.1 earthquake 224 km W of Adak, Alaska

A magnitude 3.1 earthquake struck 224 km W of Adak, Alaska on Sun, Mar 21, 2021, 12:10 AM HADT (09:10 UTC), 128 km (80 mi) below the surface.

A larger quake followed: M5.4 288 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.1 (mb), minor
Local time: Sun, Mar 21, 2021, 12:10 AM HADT
UTC: 2021-03-21 09:10:23 UTC
Depth: 128.0 km (79.6 mi), intermediate-depth
Epicenter: 51.767° N, 179.882° 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.

Location uncertainty: About 15.1 km horizontally, 15.0 km in depth
Magnitude uncertainty: ±0.19
Depth from: From location
Station coverage gap: 195°, poorly surrounded by stations
Stations used: 32

Nearby

Within 100 km, magnitude 1.5 and up: 37 in the 60 days after this one and 27 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 us6000e1ms (also filed as ak0213ogev0b). Read Fri, Sep 25, 2026, 10:45 AM UTC.