Alaska earthquakes

M4.4 earthquake 49 km SE of Nikolski, Alaska

A magnitude 4.4 earthquake struck 49 km SE of Nikolski, Alaska on Tue, Nov 21, 2017, 9:48 PM AKST (06:48 UTC), 49 km (30 mi) below the surface.

A larger quake followed: M4.9 143 km SE of Nikolski, Alaska. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 4.4 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Nov 21, 2017, 9:48 PM AKST
UTC: 2017-11-22 06:48:59 UTC
Depth: 48.6 km (30.2 mi), shallow
Epicenter: 52.654° N, 168.303° 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
4.4	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.05 · 114 stations
4.5	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 4.3 km horizontally, 8.6 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 172°
Stations used: 70

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Unalaska, AlaskaPopulation 4,491. Forecast180 kmSW

Nearby

Within 100 km, magnitude 1.5 and up: 50 in the 60 days after this one and 30 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 us2000bsqs (also filed as ak017ez925is, ak17372726). Read Thu, Oct 1, 2026, 2:52 PM UTC.