Alaska earthquakes

M2.7 earthquake 41 km SSW of Atka, Alaska

A magnitude 2.7 earthquake struck 41 km SSW of Atka, Alaska on Sun, Aug 1, 2021, 5:11 PM HADT (02:11 UTC), 210 km (131 mi) below the surface.

A larger quake followed: M4.7 67 km ESE of Atka, Alaska. This one was a foreshock.

Map

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

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The earthquake

Magnitude: 2.7 (ml), micro
Local time: Sun, Aug 1, 2021, 5:11 PM HADT
UTC: 2021-08-02 02:11:48 UTC
Depth: 210.4 km (130.7 mi), intermediate-depth
Epicenter: 51.871° N, 174.503° 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 21.7 km horizontally, 13.0 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 233°, poorly surrounded by stations
Stations used: 27

Nearby

Within 100 km, magnitude 1.5 and up: 134 in the 60 days after this one and 96 in the 30 days before it.

After

The first 60 of 134.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000f4l4 (also filed as ak0219ty9qb1). Read Thu, Sep 24, 2026, 12:05 PM UTC.