Alaska earthquakes

M4.6 earthquake 239 km SE of Chiniak, Alaska

A magnitude 4.6 earthquake struck 239 km SE of Chiniak, Alaska on Sun, Dec 1, 2019, 8:46 PM AKST (05:46 UTC), 10 km (6 mi) below the surface.

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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: 4.6 (mww), light
Local time: Sun, Dec 1, 2019, 8:46 PM AKST
UTC: 2019-12-02 05:46:40 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.084° N, 149.510° W
Region: Alaska
Felt reports: 3
Tsunami flag: Yes: a large quake in an oceanic region
Status: Reviewed by a seismologist

Tsunami

The USGS flags a quake this large in an oceanic region. The flag does not mean a tsunami happened; the tsunami warning centers decide that, and their messages are below when they issued any.

Current tsunami warnings: tsunami.gov. Warnings in force in the US also appear on our alerts pages.

Did you feel it?

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

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Strike-slip
Moment magnitude: 4.6 Mww
Nodal plane 1: Strike 82°, dip 52°, rake -18°
Nodal plane 2: Strike 183°, dip 76°, rake -140°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 6.7 km horizontally, 1.6 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 141°
Stations used: 80

Nearest places

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

Nearby

Within 100 km, magnitude 1.6 and up: 47 in the 60 days after this one and 22 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70006f6y (also filed as at00q1vepu, ak019ffrtpt4). Read Tue, Sep 29, 2026, 6:59 PM UTC.