Alaska earthquakes

M3.8 earthquake 69 km S of Adak, Alaska

A magnitude 3.8 earthquake struck 69 km S of Adak, Alaska on Sun, Jul 25, 2021, 3:18 AM HADT (12:18 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.5 161 km S of Adak, 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: 3.8 (mb), minor
Local time: Sun, Jul 25, 2021, 3:18 AM HADT
UTC: 2021-07-25 12:18:24 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.254° N, 176.501° 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 6.5 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.11
Depth from: Operator assigned
Station coverage gap: 196°, poorly surrounded by stations
Stations used: 46

Nearby

Within 100 km, magnitude 1.5 and up: 190 in the 60 days after this one and 94 in the 30 days before it.

After

The first 60 of 190.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000eywy (also filed as ak0219gvylrk). Read Fri, Sep 25, 2026, 2:06 PM UTC.