Alaska earthquakes

M5.4 earthquake 252 km ESE of Chiniak, Alaska

A magnitude 5.4 earthquake struck 252 km ESE of Chiniak, Alaska on Tue, Mar 27, 2018, 2:41 PM AKDT (22:41 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M5.5 276 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: 5.4 (mww), moderate
Local time: Tue, Mar 27, 2018, 2:41 PM AKDT
UTC: 2018-03-27 22:41:08 UTC
Depth: 6.4 km (4.0 mi), shallow
Epicenter: 56.515° N, 148.643° W
Region: Alaska
Felt reports: 1
Tsunami flag: Yes: a large quake in an oceanic region
Status: Reviewed by a seismologist

Tsunami

The USGS flags a quake this large in an oceanic region. The flag does not mean a tsunami happened; the tsunami warning centers decide that, and their messages are below when they issued any.

Current tsunami warnings: tsunami.gov. Warnings in force in the US also appear on our alerts pages.

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was I, not felt shaking.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Strike-slip
Moment magnitude: 5.4 Mww
Nodal plane 1: Strike 265°, dip 87°, rake 0°
Nodal plane 2: Strike 175°, dip 90°, rake 177°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 6.0 km horizontally, 3.4 km in depth
Magnitude uncertainty: ±0.03
Depth from: From location
Station coverage gap: 88°
Stations used: 355

Nearest places

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

Nearby

Within 100 km, magnitude 2.4 and up: at least 200 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 200.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000d9wb (also filed as ak0183ylk74s, ak18794307, at00p69tom, iscgem611836096). Read Sun, Sep 27, 2026, 1:08 AM UTC.