Alaska earthquakes

M3.3 earthquake 44 km NNE of Adak, Alaska

A magnitude 3.3 earthquake struck 44 km NNE of Adak, Alaska on Tue, Jul 27, 2021, 9:49 PM HADT (06:49 UTC), 211 km (131 mi) below the surface.

A larger quake followed: M4.3 116 km NW 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: 3.3 (ml), minor
Local time: Tue, Jul 27, 2021, 9:49 PM HADT
UTC: 2021-07-28 06:49:14 UTC
Depth: 211.0 km (131.1 mi), intermediate-depth
Epicenter: 52.267° N, 176.506° 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 14.3 km horizontally, 8.9 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 135°
Stations used: 31

Nearby

Within 100 km, magnitude 1.5 and up: 131 in the 60 days after this one and 69 in the 30 days before it.

After

The first 60 of 131.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000f7n6 (also filed as ak0219lr6o1q). Read Sat, Sep 26, 2026, 12:30 AM UTC.