Alaska earthquakes

M2.5 earthquake 134 km WSW of Adak, Alaska

A magnitude 2.5 earthquake struck 134 km WSW of Adak, Alaska on Tue, Oct 5, 2021, 6:49 PM HADT (03:49 UTC), 21 km (13 mi) below the surface.

A larger quake followed: M5.0 128 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.5 (ml), micro
Local time: Tue, Oct 5, 2021, 6:49 PM HADT
UTC: 2021-10-06 03:49:35 UTC
Depth: 21.1 km (13.1 mi), shallow
Epicenter: 51.613° N, 178.539° 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 6.3 km horizontally, 9.5 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 172°
Stations used: 34

Nearby

Within 100 km, magnitude 1.5 and up: 142 in the 60 days after this one and 83 in the 30 days before it.

After

The first 60 of 142.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000fsfh (also filed as av91388226, ak021cth0p6d). Read Thu, Sep 24, 2026, 1:38 PM UTC.