Alaska earthquakes

M1.9 earthquake 45 km WSW of Nikolski, Alaska

A magnitude 1.9 earthquake struck 45 km WSW of Nikolski, Alaska on Sun, Sep 23, 2018, 10:20 PM AKDT (06:20 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M4.8 72 km SSE of Nikolski, Alaska. This one was a foreshock.

Unalaska 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: 1.9 (ML, local (Richter)), micro
Magnitude from: Alaska Earthquake Center
Local time: Sun, Sep 23, 2018, 10:20 PM AKDT
UTC: 2018-09-24 06:20:39 UTC
Depth: 13.3 km (8.3 mi), shallow
Epicenter: 52.727° N, 169.430° 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
1.9	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
1.88	ML, local (Richter)	AV	Final · ±0.155 · 9 stations

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Stations used: 13

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast231 kmWSW

Nearby

Within 100 km, magnitude 1.5 and up: 41 in the 60 days after this one and 83 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 ak018c9o6mup (also filed as ak20261711, av61784901). Read Mon, Oct 5, 2026, 9:18 AM UTC.