Alaska earthquakes

M3.5 earthquake 70 km NW of Nikolski, Alaska

A magnitude 3.5 earthquake struck 70 km NW of Nikolski, Alaska on Mon, Feb 19, 2018, 2:34 PM AKST (23:34 UTC), 207 km (129 mi) below the surface.

A larger quake followed: M3.9 26 km SE of Nikolski, Alaska. This one was a foreshock.

Dutch Harbor forecast More in Alaska

Map

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

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The earthquake

Magnitude: 3.5 (ML, local (Richter)), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Mon, Feb 19, 2018, 2:34 PM AKST
UTC: 2018-02-19 23:34:23 UTC
Depth: 207.1 km (128.7 mi), intermediate-depth
Epicenter: 53.376° N, 169.622° 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	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.128 · 8 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 20.4 km horizontally, 15.1 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 163°
Stations used: 32

Nearest places

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

Dutch Harbor, AlaskaPopulation 4,376. Forecast211 kmWSW

Nearby

Within 100 km, magnitude 1.5 and up: 37 in the 60 days after this one and 9 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 us2000d905 (also filed as ak18571291, ak0182b2rnvz). Read Thu, Oct 1, 2026, 1:48 PM UTC.