Alaska earthquakes

M3.8 earthquake 180 km W of Adak, Alaska

A magnitude 3.8 earthquake struck 180 km W of Adak, Alaska on Wed, Jan 17, 2018, 1:52 AM HAST (11:52 UTC), 218 km (136 mi) below the surface.

A larger quake followed: M5.7 204 km WNW of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.8 (mb, body-wave), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, Jan 17, 2018, 1:52 AM HAST
UTC: 2018-01-17 11:52:54 UTC
Depth: 218.3 km (135.6 mi), intermediate-depth
Epicenter: 52.033° N, 179.243° 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
3.8	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.073 · 48 stations
3.5	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 10.0 km horizontally, 6.7 km in depth
Magnitude uncertainty: ±0.07
Stations used: 26

Nearby

Within 100 km, magnitude 1.5 and up: 125 in the 60 days after this one and 74 in the 30 days before it.

After

The first 60 of 125.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000clpq (also filed as ak018sazxh5, ak18081321). Read Fri, Oct 2, 2026, 11:33 AM UTC.