Alaska earthquakes

M3.0 earthquake 88 km WSW of Nikolski, Alaska

A magnitude 3.0 earthquake struck 88 km WSW of Nikolski, Alaska on Sun, Jul 4, 2021, 3:08 PM AKDT (23:08 UTC), 144 km (90 mi) below the surface.

A larger quake followed: M3.8 106 km SW 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: 3.0 (ml), minor
Local time: Sun, Jul 4, 2021, 3:08 PM AKDT
UTC: 2021-07-04 23:08:03 UTC
Depth: 144.3 km (89.7 mi), intermediate-depth
Epicenter: 52.711° N, 170.111° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

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 10.7 km horizontally, 6.6 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 190°, poorly surrounded by stations
Stations used: 23

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast271 kmWSW

Nearby

Within 100 km, magnitude 1.5 and up: 51 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 us6000f76x (also filed as ak0218ic64f5). Read Thu, Sep 24, 2026, 3:59 AM UTC.