Alaska earthquakes

M3.0 earthquake 254 km WNW of Adak, Alaska

A magnitude 3.0 earthquake struck 254 km WNW of Adak, Alaska on Sat, Aug 28, 2021, 2:30 AM GMT+12 (14:30 UTC), 188 km (117 mi) below the surface.

A larger quake followed: M3.9 250 km W of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.0 (ml), minor
Local time: Sat, Aug 28, 2021, 2:30 AM GMT+12
UTC: 2021-08-27 14:30:43 UTC
Depth: 188.3 km (117.0 mi), intermediate-depth
Epicenter: 52.381° N, 179.738° E
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 14.7 km horizontally, 12.1 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 177°
Stations used: 40

Nearby

Within 100 km, magnitude 1.5 and up: 35 in the 60 days after this one and 28 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 us7000fa6i (also filed as ak021azhyjb1). Read Thu, Sep 24, 2026, 12:17 PM UTC.