Alaska earthquakes

M4.0 earthquake 187 km SE of Chiniak, Alaska

A magnitude 4.0 earthquake struck 187 km SE of Chiniak, Alaska on Wed, Feb 28, 2018, 3:53 PM AKST (00:53 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M5.4 252 km ESE 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: 4.0 (mb, body-wave), light
Magnitude from: Alaska Earthquake Center
Local time: Wed, Feb 28, 2018, 3:53 PM AKST
UTC: 2018-03-01 00:53:17 UTC
Depth: 5.1 km (3.2 mi), shallow
Epicenter: 56.365° N, 150.208° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
4.0	mb, body-wave	Alaska Earthquake Center	Preferred · Preliminary
4.0	mb, body-wave	USGS National Earthquake Information Center	Reviewed · ±0.368 · 2 stations

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Stations used: 103

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 202 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 202.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak0182r8k7wu (also filed as ak18572276, us1000d1ys). Read Fri, Oct 2, 2026, 5:06 PM UTC.