Alaska earthquakes

M4.3 earthquake 247 km ESE of Chiniak, Alaska

A magnitude 4.3 earthquake struck 247 km ESE of Chiniak, Alaska on Fri, Jan 26, 2018, 1:42 PM AKST (22:42 UTC), 21 km (13 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: 4.3 (mwr), light
Local time: Fri, Jan 26, 2018, 1:42 PM AKST
UTC: 2018-01-26 22:42:50 UTC
Depth: 21.4 km (13.3 mi), shallow
Epicenter: 56.488° N, 148.754° 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 II, weak 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: 4.3 Mwr
Nodal plane 1: Strike 164°, dip 61°, rake 167°
Nodal plane 2: Strike 261°, dip 78°, rake 30°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.6 km horizontally, 4.9 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 135°
Stations used: 249

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 us2000cq59 (also filed as ak18202636, at00p36prd, ak01817dbobg). Read Mon, Sep 28, 2026, 4:13 PM UTC.