Alaska earthquakes

M2.5 earthquake 103 km ESE of Adak, Alaska

A magnitude 2.5 earthquake struck 103 km ESE of Adak, Alaska on Thu, Nov 4, 2021, 12:31 PM HADT (21:31 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M3.1 53 km SSE 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: 2.5 (ml), micro
Local time: Thu, Nov 4, 2021, 12:31 PM HADT
UTC: 2021-11-04 21:31:01 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.502° N, 175.263° 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 1.5 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.15
Depth from: Operator assigned
Station coverage gap: 245°, poorly surrounded by stations
Stations used: 18

Nearby

Within 100 km, magnitude 1.5 and up: 131 in the 60 days after this one and 58 in the 30 days before it.

After

The first 60 of 131.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000frm9 (also filed as ak021e5q7nj2). Read Thu, Sep 24, 2026, 9:35 AM UTC.