Alaska earthquakes

M2.6 earthquake 87 km S of Adak, Alaska

A magnitude 2.6 earthquake struck 87 km S of Adak, Alaska on Sat, Aug 21, 2021, 5:28 PM HADT (02:28 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M2.9 38 km SSW of Adak, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude: 2.6 (ml), micro
Local time: Sat, Aug 21, 2021, 5:28 PM HADT
UTC: 2021-08-22 02:28:45 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.104° N, 176.878° 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 5.1 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.15
Depth from: Operator assigned
Station coverage gap: 261°, poorly surrounded by stations
Stations used: 21

Nearby

Within 100 km, magnitude 1.5 and up: 124 in the 60 days after this one and 75 in the 30 days before it.

After

The first 60 of 124.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000f7lb (also filed as ak021ar146dm). Read Thu, Sep 24, 2026, 5:40 AM UTC.