Alaska earthquakes

M3.3 earthquake 61 km ENE of Adak, Alaska

A magnitude 3.3 earthquake struck 61 km ENE of Adak, Alaska on Sat, Dec 5, 2020, 8:37 PM HAST (06:37 UTC), 165 km (103 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.

Open the live map with earthquakes

The earthquake

Magnitude: 3.3 (ml), minor
Local time: Sat, Dec 5, 2020, 8:37 PM HAST
UTC: 2020-12-06 06:37:35 UTC
Depth: 165.5 km (102.8 mi), intermediate-depth
Epicenter: 52.059° N, 175.789° 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 13.7 km horizontally, 3.9 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 148°
Stations used: 27

Nearby

Within 100 km, magnitude 1.5 and up: 114 in the 60 days after this one and 54 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 us7000cqp2 (also filed as ak020fo21y75). Read Tue, Sep 29, 2026, 10:28 AM UTC.