Alaska earthquakes

M3.1 earthquake 255 km ESE of Chiniak, Alaska

A magnitude 3.1 earthquake struck 255 km ESE of Chiniak, Alaska on Tue, Oct 30, 2018, 1:05 AM AKDT (09:05 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.4 238 km SE 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: 3.1 (ml), minor
Local time: Tue, Oct 30, 2018, 1:05 AM AKDT
UTC: 2018-10-30 09:05:07 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.391° N, 148.717° 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.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 8.3 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.05
Depth from: Operator assigned
Station coverage gap: 218°, poorly surrounded by stations
Stations used: 80

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 184 in the 60 days after this one and 15 in the 30 days before it.

After

The first 60 of 184.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000hp4c (also filed as ak20335132, aacse018dx985nq, ak018dx985nq). Read Thu, Sep 24, 2026, 4:52 AM UTC.