Alaska earthquakes

M3.1 earthquake 25 km W of Dutch Harbor, Alaska

A magnitude 3.1 earthquake struck 25 km W of Dutch Harbor, Alaska on Fri, Jul 28, 2023, 1:14 AM AKDT (09:14 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.5 93 km S of Unalaska, 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: 3.1 (ML, local (Richter)), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Fri, Jul 28, 2023, 1:14 AM AKDT
UTC: 2023-07-28 09:14:45 UTC
Depth: 6.7 km (4.2 mi), shallow
Epicenter: 53.855° N, 166.920° 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
3.1	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.097 · 14 stations
2.5	ML, local (Richter)	Alaska Earthquake Center	Preliminary
2.5	ML, local (Richter)	AV	Final · ±0.300130778977311 · 16 stations

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 4.0 km horizontally, 4.8 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 123°
Stations used: 36

Nearest places

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

Dutch Harbor, AlaskaPopulation 4,376. Forecast25 kmW

Nearby

Within 100 km, magnitude 1.5 and up: 122 in the 60 days after this one and 55 in the 30 days before it.

After

The first 60 of 122.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000kwf2 (also filed as av91980771, ak0239lsrj7r). Read Sat, Oct 3, 2026, 10:34 AM UTC.