Alaska earthquakes

M4.0 earthquake 291 km WSW of Adak, Alaska

A magnitude 4.0 earthquake struck 291 km WSW of Adak, Alaska on Sat, Sep 26, 2020, 3:16 PM GMT+12 (03:16 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.3 Andreanof Islands, Aleutian Islands, Alaska. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 4.0 (mb), light
Local time: Sat, Sep 26, 2020, 3:16 PM GMT+12
UTC: 2020-09-26 03:16:15 UTC
Depth: 34.7 km (21.6 mi), shallow
Epicenter: 51.162° N, 179.318° E
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 2.5 km horizontally, 5.8 km in depth
Magnitude uncertainty: ±0.17
Depth from: From location
Station coverage gap: 210°, poorly surrounded by stations
Stations used: 41

Nearby

Within 100 km, magnitude 1.5 and up: 80 in the 60 days after this one and 70 in the 30 days before it.

After

The first 60 of 80.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c3wd (also filed as ak020cekzgqp). Read Mon, Sep 28, 2026, 1:58 AM UTC.