Alaska earthquakes

M2.5 earthquake 93 km SSW of Unalaska, Alaska

A magnitude 2.5 earthquake struck 93 km SSW of Unalaska, Alaska on Tue, Aug 21, 2018, 12:42 PM AKDT (20:42 UTC), 29 km (18 mi) below the surface.

A larger quake followed: M4.2 69 km E 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: 2.5 (ml), micro
Local time: Tue, Aug 21, 2018, 12:42 PM AKDT
UTC: 2018-08-21 20:42:19 UTC
Depth: 28.7 km (17.8 mi), shallow
Epicenter: 53.091° N, 167.046° 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 5.0 km horizontally, 13.3 km in depth
Depth from: From location
Station coverage gap: 195°, poorly surrounded by stations
Stations used: 29

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast93 kmSSW

Nearby

Within 100 km, magnitude 1.5 and up: 82 in the 60 days after this one and 35 in the 30 days before it.

After

The first 60 of 82.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000hgw2 (also filed as ak20135319, ak018apodks1). Read Wed, Sep 30, 2026, 11:48 PM UTC.