Alaska earthquakes

M3.0 earthquake 225 km SE of Chiniak, Alaska

A magnitude 3.0 earthquake struck 225 km SE of Chiniak, Alaska on Sun, Sep 30, 2018, 2:57 AM AKDT (10:57 UTC), 20 km (13 mi) below the surface.

A larger quake followed: M4.8 218 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: Sun, Sep 30, 2018, 2:57 AM AKDT
UTC: 2018-09-30 10:57:57 UTC
Depth: 20.3 km (12.6 mi), shallow
Epicenter: 56.053° N, 149.924° 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 6.3 km horizontally, 8.2 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 214°, poorly surrounded by stations
Stations used: 74

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 199 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 199.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000h9jc (also filed as ak018cjo0if1, ak20267470, aacse018cjo0if1). Read Tue, Sep 29, 2026, 4:41 PM UTC.