Alaska earthquakes

M2.5 earthquake 240 km WSW of Adak, Alaska

A magnitude 2.5 earthquake struck 240 km WSW of Adak, Alaska on Wed, Dec 16, 2020, 4:19 AM GMT+12 (16:19 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M6.1 230 km WSW of Adak, 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: 2.5 (ml), micro
Local time: Wed, Dec 16, 2020, 4:19 AM GMT+12
UTC: 2020-12-15 16:19:49 UTC
Depth: 15.2 km (9.4 mi), shallow
Epicenter: 51.409° N, 179.968° 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 13.7 km horizontally, 14.0 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 344°, poorly surrounded by stations
Stations used: 22

Nearby

Within 100 km, magnitude 1.5 and up: 46 in the 60 days after this one and 25 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000csx9 (also filed as ak020g33ql2u). Read Mon, Sep 28, 2026, 7:20 AM UTC.