Alaska earthquakes

M2.8 earthquake 266 km W of Adak, Alaska

A magnitude 2.8 earthquake struck 266 km W of Adak, Alaska on Tue, Jul 27, 2021, 9:54 PM GMT+12 (09:54 UTC), 195 km (121 mi) below the surface.

A larger quake followed: M4.8 Rat Islands, Aleutian Islands, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude: 2.8 (ml), micro
Local time: Tue, Jul 27, 2021, 9:54 PM GMT+12
UTC: 2021-07-27 09:54:09 UTC
Depth: 195.4 km (121.4 mi), intermediate-depth
Epicenter: 52.047° N, 179.499° 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 10.1 km horizontally, 6.8 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 184°, poorly surrounded by stations
Stations used: 33

Nearby

Within 100 km, magnitude 1.5 and up: 122 in the 60 days after this one and 49 in the 30 days before it.

After

The first 60 of 122.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000f7mr (also filed as ak0219k5gom4). Read Fri, Sep 25, 2026, 10:59 PM UTC.