Alaska earthquakes

M3.5 earthquake 21 km NE of Nikolski, Alaska

A magnitude 3.5 earthquake struck 21 km NE of Nikolski, Alaska on Sat, Mar 19, 2016, 4:44 PM AKDT (00:44 UTC), 93 km (58 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: 3.5 (mb, body-wave), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, Mar 19, 2016, 4:44 PM AKDT
UTC: 2016-03-20 00:44:52 UTC
Depth: 93.3 km (58.0 mi), intermediate-depth
Epicenter: 53.078° N, 168.631° 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
3.5	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.202 · 6 stations
2.9	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 8.6 km horizontally, 5.8 km in depth
Magnitude uncertainty: ±0.20
Stations used: 20

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast165 kmWSW

Nearby

Within 100 km, magnitude 1.5 and up: 103 in the 60 days after this one and 39 in the 30 days before it.

After

The first 60 of 103.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us20005cw8 (also filed as ak13011329, ak0163ob9b1z). Read Sun, Oct 4, 2026, 10:34 PM UTC.