Alaska earthquakes

M2.5 earthquake 47 km SE of Adak, Alaska

A magnitude 2.5 earthquake struck 47 km SE of Adak, Alaska on Fri, Dec 18, 2020, 7:18 AM HAST (17:18 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M3.8 88 km SW 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: 2.5 (ml), micro
Local time: Fri, Dec 18, 2020, 7:18 AM HAST
UTC: 2020-12-18 17:18:01 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.520° N, 176.246° 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 1.7 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.13
Depth from: Operator assigned
Station coverage gap: 225°, poorly surrounded by stations
Stations used: 22

Nearby

Within 100 km, magnitude 1.5 and up: 130 in the 60 days after this one and 78 in the 30 days before it.

After

The first 60 of 130.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000d3va (also filed as ak020g82xqmp). Read Sat, Sep 26, 2026, 9:11 AM UTC.