Alaska earthquakes

M5.1 earthquake 272 km ESE of Chiniak, Alaska

A magnitude 5.1 earthquake struck 272 km ESE of Chiniak, Alaska on Mon, Mar 26, 2018, 10:01 AM AKDT (18:01 UTC), 10 km (6 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: 5.1 (mww), moderate
Local time: Mon, Mar 26, 2018, 10:01 AM AKDT
UTC: 2018-03-26 18:01:06 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.399° N, 148.384° 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.

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: 5.1 Mww
Nodal plane 1: Strike 268°, dip 79°, rake 0°
Nodal plane 2: Strike 178°, dip 90°, rake 169°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.5 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.04
Depth from: Operator assigned
Station coverage gap: 139°
Stations used: 84

Nearest places

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

Nearby

Within 100 km, magnitude 2.1 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 us1000d97r (also filed as ak18779020, ak0183wvejbu, iscgem614220661). Read Sun, Sep 27, 2026, 4:00 AM UTC.