Alaska earthquakes

M3.8 earthquake 31 km NE of Nikolski, Alaska

A magnitude 3.8 earthquake struck 31 km NE of Nikolski, Alaska on Tue, Mar 22, 2016, 2:04 AM AKDT (10:04 UTC), 106 km (66 mi) below the surface.

A larger quake followed: M5.5 73 km S 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: 3.8 (ML, local (Richter)), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Mar 22, 2016, 2:04 AM AKDT
UTC: 2016-03-22 10:04:20 UTC
Depth: 105.8 km (65.7 mi), intermediate-depth
Epicenter: 53.144° N, 168.544° 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	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.148 · 6 stations
3.1	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 11.8 km horizontally, 4.3 km in depth
Magnitude uncertainty: ±0.15
Station coverage gap: 169°
Stations used: 23

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast156 kmWSW

Nearby

Within 100 km, magnitude 1.5 and up: 91 in the 60 days after this one and 41 in the 30 days before it.

After

The first 60 of 91.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us20005dx5 (also filed as ak13042327, ak0163rs1p05). Read Sun, Oct 4, 2026, 5:07 PM UTC.