Alaska earthquakes

M3.6 earthquake 92 km SW of Adak, Alaska

A magnitude 3.6 earthquake struck 92 km SW of Adak, Alaska on Mon, Sep 13, 2021, 6:44 AM HADT (15:44 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M5.5 185 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.6 (ml), minor
Local time: Mon, Sep 13, 2021, 6:44 AM HADT
UTC: 2021-09-13 15:44:15 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.365° N, 177.685° 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 4.0 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 205°, poorly surrounded by stations
Stations used: 28

Nearby

Within 100 km, magnitude 1.5 and up: 140 in the 60 days after this one and 59 in the 30 days before it.

After

The first 60 of 140.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000fqw3 (also filed as ak021brmrsxh). Read Thu, Sep 24, 2026, 9:19 AM UTC.