Alaska earthquakes

M4.6 earthquake 287 km SE of Chiniak, Alaska

A magnitude 4.6 earthquake struck 287 km SE of Chiniak, Alaska on Thu, Mar 8, 2018, 4:09 PM AKST (01:09 UTC), 6 km (4 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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The earthquake

Magnitude: 4.6 (mb), light
Local time: Thu, Mar 8, 2018, 4:09 PM AKST
UTC: 2018-03-09 01:09:00 UTC
Depth: 6.0 km (3.8 mi), shallow
Epicenter: 55.649° N, 149.234° 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 5.6 km horizontally, 5.1 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 155°
Stations used: 249

Nearby

Within 100 km, magnitude 1.6 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

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000d1xl (also filed as ak18635642, ak01834h6yzt). Read Wed, Sep 30, 2026, 1:51 PM UTC.