Alaska earthquakes

M3.3 earthquake 237 km ESE of Chiniak, Alaska

A magnitude 3.3 earthquake struck 237 km ESE of Chiniak, Alaska on Tue, Jan 23, 2018, 7:05 AM AKST (16:05 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.5 256 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: 3.3 (mb), minor
Local time: Tue, Jan 23, 2018, 7:05 AM AKST
UTC: 2018-01-23 16:05:45 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.668° N, 148.760° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 9.0 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.49
Depth from: Operator assigned
Station coverage gap: 251°, poorly surrounded by stations
Stations used: 19

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 200 in the 60 days after this one and 102 in the 30 days before it.

After

The first 60 of at least 200.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000cr1a (also filed as ak01812ax3ge, ak18182982). Read Tue, Sep 29, 2026, 4:30 PM UTC.