Alaska earthquakes

M2.8 earthquake 257 km ESE of Chiniak, Alaska

A magnitude 2.8 earthquake struck 257 km ESE of Chiniak, Alaska on Wed, May 30, 2018, 1:48 AM AKDT (09:48 UTC), 20 km (13 mi) below the surface.

A larger quake followed: M4.8 224 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: 2.8 (ml), micro
Local time: Wed, May 30, 2018, 1:48 AM AKDT
UTC: 2018-05-30 09:48:34 UTC
Depth: 20.3 km (12.6 mi), shallow
Epicenter: 56.437° N, 148.631° 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 9.1 km horizontally, 10.7 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 203°, poorly surrounded by stations
Stations used: 65

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 us1000emzs (also filed as ak0186w89bsa, ak19756923, aacse0186w89bsa). Read Mon, Sep 28, 2026, 1:39 PM UTC.