Alaska earthquakes

M4.8 earthquake 288 km SE of Chiniak, Alaska

A magnitude 4.8 earthquake struck 288 km SE of Chiniak, Alaska on Tue, Jan 23, 2018, 3:19 AM AKST (12:19 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M5.3 254 km SE of Chiniak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 4.8 (mb), light
Local time: Tue, Jan 23, 2018, 3:19 AM AKST
UTC: 2018-01-23 12:19:27 UTC
Depth: 5.7 km (3.6 mi), shallow
Epicenter: 55.666° N, 149.171° W
Region: Alaska
Felt reports: 3
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

3 people reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 7.3 km horizontally, 4.8 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 149°
Stations used: 206

Nearby

Within 100 km, magnitude 1.8 and up: at least 202 in the 60 days after this one and 63 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 us2000cn20 (also filed as ak18177529, ak018128mbqo). Read Tue, Sep 29, 2026, 6:55 AM UTC.