Alaska earthquakes

M3.8 earthquake 241 km SE of Old Harbor, Alaska

A magnitude 3.8 earthquake struck 241 km SE of Old Harbor, Alaska on Wed, Mar 21, 2018, 8:02 AM AKDT (16:02 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.2 228 km SE of Chiniak, Alaska. This one was a foreshock.

Womens Bay 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: 3.8 (mb), minor
Local time: Wed, Mar 21, 2018, 8:02 AM AKDT
UTC: 2018-03-21 16:02:07 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 55.548° N, 150.773° 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 6.7 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.36
Depth from: Operator assigned
Station coverage gap: 194°, poorly surrounded by stations
Stations used: 166

Nearest places

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

Womens Bay, AlaskaPopulation 719. Forecast264 kmSSE

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000d72r (also filed as ak0183okj5li, ak18722306). Read Wed, Sep 30, 2026, 6:39 PM UTC.