Alaska earthquakes

M3.0 earthquake 251 km ESE of Chiniak, Alaska

A magnitude 3.0 earthquake struck 251 km ESE of Chiniak, Alaska on Sat, Oct 6, 2018, 3:40 AM AKDT (11:40 UTC), 21 km (13 mi) below the surface.

A larger quake followed: M3.1 257 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: 3.0 (ml), minor
Local time: Sat, Oct 6, 2018, 3:40 AM AKDT
UTC: 2018-10-06 11:40:37 UTC
Depth: 21.3 km (13.2 mi), shallow
Epicenter: 56.559° N, 148.601° 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 8.2 km horizontally, 10.8 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 213°, poorly surrounded by stations
Stations used: 50

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 us1000hbv7 (also filed as ak20280546, ak018ctlq952, aacse018ctlq952). Read Wed, Sep 23, 2026, 5:03 AM UTC.