Alaska earthquakes

M3.1 earthquake 72 km ENE of Adak, Alaska

A magnitude 3.1 earthquake struck 72 km ENE of Adak, Alaska on Thu, Jul 29, 2021, 4:54 PM HADT (01:54 UTC), 98 km (61 mi) below the surface.

A larger quake followed: M3.5 63 km SE of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Thu, Jul 29, 2021, 4:54 PM HADT
UTC: 2021-07-30 01:54:56 UTC
Depth: 98.2 km (61.0 mi), intermediate-depth
Epicenter: 52.092° N, 175.639° 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 9.9 km horizontally, 2.1 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 164°
Stations used: 18

Nearby

Within 100 km, magnitude 1.5 and up: 141 in the 60 days after this one and 58 in the 30 days before it.

After

The first 60 of 141.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000f53m (also filed as ak0219ozbcvr). Read Thu, Sep 24, 2026, 9:06 AM UTC.