Alaska earthquakes

M2.8 earthquake 17 km SE of Adak, Alaska

A magnitude 2.8 earthquake struck 17 km SE of Adak, Alaska on Sat, Oct 31, 2020, 3:25 PM HADT (00:25 UTC), 74 km (46 mi) below the surface.

A larger quake followed: M4.3 39 km SSW 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: 2.8 (ml), micro
Local time: Sat, Oct 31, 2020, 3:25 PM HADT
UTC: 2020-11-01 00:25:24 UTC
Depth: 74.0 km (46.0 mi), intermediate-depth
Epicenter: 51.760° N, 176.456° 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 7.1 km horizontally, 6.2 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 191°, poorly surrounded by stations
Stations used: 22

Nearby

Within 100 km, magnitude 1.5 and up: 139 in the 60 days after this one and 65 in the 30 days before it.

After

The first 60 of 139.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000ce1u (also filed as ak020e22llxd). Read Tue, Sep 29, 2026, 5:27 PM UTC.