Alaska earthquakes

M3.2 earthquake 220 km SSE of Chiniak, Alaska

A magnitude 3.2 earthquake struck 220 km SSE of Chiniak, Alaska on Tue, Mar 20, 2018, 9:47 PM AKDT (05:47 UTC), 5 km (3 mi) below the surface.

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

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.2 (ml), minor
Local time: Tue, Mar 20, 2018, 9:47 PM AKDT
UTC: 2018-03-21 05:47:38 UTC
Depth: 5.5 km (3.4 mi), shallow
Epicenter: 55.920° N, 150.414° 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 7.9 km horizontally, 8.0 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 201°, poorly surrounded by stations
Stations used: 60

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 201 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 201.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000d74q (also filed as ak0183oe93l0, ak18719814). Read Mon, Sep 28, 2026, 11:01 PM UTC.