Alaska earthquakes

M3.8 earthquake 67 km SSW of Adak, Alaska

A magnitude 3.8 earthquake struck 67 km SSW of Adak, Alaska on Sun, Jun 21, 2020, 1:05 AM HADT (10:05 UTC), 44 km (27 mi) below the surface.

A larger quake followed: M5.2 52 km WNW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.8 (ml), minor
Local time: Sun, Jun 21, 2020, 1:05 AM HADT
UTC: 2020-06-21 10:05:40 UTC
Depth: 43.6 km (27.1 mi), shallow
Epicenter: 51.349° N, 177.116° 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 5.5 km horizontally, 20.2 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 208°, poorly surrounded by stations
Stations used: 48

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 120 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000ahly (also filed as ak0207y9yj6x). Read Tue, Sep 29, 2026, 7:40 AM UTC.