Alaska earthquakes

M2.7 earthquake 36 km S of Adak, Alaska

A magnitude 2.7 earthquake struck 36 km S of Adak, Alaska on Tue, Sep 22, 2020, 9:18 AM HADT (18:18 UTC), 47 km (29 mi) below the surface.

A larger quake followed: M4.3 68 km SSE 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: 2.7 (ml), micro
Local time: Tue, Sep 22, 2020, 9:18 AM HADT
UTC: 2020-09-22 18:18:41 UTC
Depth: 47.0 km (29.2 mi), shallow
Epicenter: 51.546° N, 176.714° 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, 13.6 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 202°, poorly surrounded by stations
Stations used: 25

Nearby

Within 100 km, magnitude 1.5 and up: 138 in the 60 days after this one and 97 in the 30 days before it.

After

The first 60 of 138.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c6c4 (also filed as ak020c87s29s). Read Sun, Sep 27, 2026, 6:16 PM UTC.