Alaska earthquakes

M2.9 earthquake 36 km SE of Atka, Alaska

A magnitude 2.9 earthquake struck 36 km SE of Atka, Alaska on Mon, Dec 25, 2017, 7:40 PM HAST (05:40 UTC), 172 km (107 mi) below the surface.

A larger quake followed: M4.8 47 km NNW 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: 2.9 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Mon, Dec 25, 2017, 7:40 PM HAST
UTC: 2017-12-26 05:40:28 UTC
Depth: 172.1 km (106.9 mi), intermediate-depth
Epicenter: 51.995° N, 173.777° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
2.9	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed
2.9	ML, local (Richter)	Alaska Earthquake Center	Preliminary

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 19.5 km horizontally, 9.1 km in depth
Depth from: From location
Station coverage gap: 194°, poorly surrounded by stations
Stations used: 14

Nearby

Within 100 km, magnitude 1.5 and up: 83 in the 60 days after this one and 32 in the 30 days before it.

After

The first 60 of 83.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000c230 (also filed as ak18018198, ak017gjgoqnf). Read Thu, Oct 1, 2026, 6:50 PM UTC.