Alaska earthquakes

M4.7 earthquake 283 km SE of Chiniak, Alaska

A magnitude 4.7 earthquake struck 283 km SE of Chiniak, Alaska on Sat, Aug 25, 2018, 2:33 PM AKDT (22:33 UTC), 6 km (4 mi) below the surface.

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The earthquake

Magnitude: 4.7 (mwr), light
Local time: Sat, Aug 25, 2018, 2:33 PM AKDT
UTC: 2018-08-25 22:33:47 UTC
Depth: 5.7 km (3.6 mi), shallow
Epicenter: 55.709° N, 149.204° W
Region: Alaska
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?

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: 4.7 Mwr
Nodal plane 1: Strike 11°, dip 56°, rake -157°
Nodal plane 2: Strike 268°, dip 71°, rake -36°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 6.2 km horizontally, 4.2 km in depth
Magnitude uncertainty: ±0.03
Depth from: From location
Station coverage gap: 145°
Stations used: 222

Nearby

Within 100 km, magnitude 1.7 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000ghdd (also filed as ak018awbnyzw, ak20206611, at00pe1g0d, aacse018awbnyzw). Read Tue, Sep 22, 2026, 4:52 PM UTC.