Alaska earthquakes

M3.9 earthquake 63 km ESE of Adak, Alaska

A magnitude 3.9 earthquake struck 63 km ESE of Adak, Alaska on Fri, Nov 6, 2020, 6:03 AM HAST (16:03 UTC), 65 km (40 mi) below the surface.

A larger quake followed: M4.6 47 km WSW of Atka, 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: 3.9 (mb), minor
Local time: Fri, Nov 6, 2020, 6:03 AM HAST
UTC: 2020-11-06 16:03:00 UTC
Depth: 65.1 km (40.4 mi), shallow
Epicenter: 51.703° N, 175.763° 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 5.6 km horizontally, 6.9 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 120°
Stations used: 69

Nearby

Within 100 km, magnitude 1.5 and up: 114 in the 60 days after this one and 62 in the 30 days before it.

After

The first 60 of 114.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000cdaz (also filed as ak020ealof8z). Read Mon, Sep 28, 2026, 3:04 AM UTC.