Alaska earthquakes

M4.0 earthquake 81 km NNE of Adak, Alaska

A magnitude 4.0 earthquake struck 81 km NNE of Adak, Alaska on Mon, Jan 23, 2017, 1:42 PM HAST (23:42 UTC), 218 km (136 mi) below the surface.

A larger quake followed: M4.2 37 km ENE of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 4.0 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Mon, Jan 23, 2017, 1:42 PM HAST
UTC: 2017-01-23 23:42:39 UTC
Depth: 218.1 km (135.5 mi), intermediate-depth
Epicenter: 52.538° N, 176.116° 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
4.0	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.072 · 52 stations
4.0	mb, body-wave	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 14.5 km horizontally, 6.3 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 142°
Stations used: 71

Nearby

Within 100 km, magnitude 1.5 and up: 25 in the 60 days after this one and 11 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 us10007vjw (also filed as ak15139937, ak01712fb1cy). Read Sat, Oct 3, 2026, 9:43 AM UTC.