Alaska earthquakes

M3.0 earthquake 67 km E of Adak, Alaska

A magnitude 3.0 earthquake struck 67 km E of Adak, Alaska on Sun, Aug 22, 2021, 9:54 PM HADT (06:54 UTC), 71 km (44 mi) below the surface.

A larger quake followed: M3.6 68 km ESE 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: 3.0 (ml), minor
Local time: Sun, Aug 22, 2021, 9:54 PM HADT
UTC: 2021-08-23 06:54:57 UTC
Depth: 70.9 km (44.1 mi), intermediate-depth
Epicenter: 51.837° N, 175.657° 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 7.1 km horizontally, 9.9 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 201°, poorly surrounded by stations
Stations used: 39

Nearby

Within 100 km, magnitude 1.5 and up: 119 in the 60 days after this one and 80 in the 30 days before it.

After

The first 60 of 119.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000f79g (also filed as ak021asr6urc). Read Thu, Sep 24, 2026, 9:22 AM UTC.