Alaska earthquakes

M5.1 earthquake 222 km WSW of Adak, Alaska

A magnitude 5.1 earthquake struck 222 km WSW of Adak, Alaska on Wed, Jan 18, 2017, 1:18 AM HAST (11:18 UTC), 52 km (33 mi) below the surface.

A larger quake followed: M5.6 Rat Islands, Aleutian Islands, 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: 5.1 (mb, body-wave), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, Jan 18, 2017, 1:18 AM HAST
UTC: 2017-01-18 11:18:15 UTC
Depth: 52.3 km (32.5 mi), shallow
Epicenter: 51.098° N, 179.582° W
Region: Alaska
Strongest shaking: III, weak shaking
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
5.1	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.029 · 370 stations
5.1	mb, body-wave	Alaska Earthquake Center	Preliminary

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: III, weak shaking
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

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 8.3 km horizontally, 8.4 km in depth
Magnitude uncertainty: ±0.03
Depth from: From location
Station coverage gap: 203°, poorly surrounded by stations
Stations used: 101

Nearby

Within 100 km, magnitude 2.1 and up: 38 in the 60 days after this one and 32 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 us10007twz (also filed as ak15091116, ak017tybwno). Read Sun, Oct 4, 2026, 4:59 AM UTC.