Alaska earthquakes

M3.7 earthquake 53 km SSE of Old Harbor, Alaska

A magnitude 3.7 earthquake struck 53 km SSE of Old Harbor, Alaska on Wed, Dec 29, 2021, 9:05 AM AKST (18:05 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M3.9 84 km S of Akhiok, Alaska. This one was a foreshock.

Womens Bay forecast More in Alaska

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.7 (ml), minor
Local time: Wed, Dec 29, 2021, 9:05 AM AKST
UTC: 2021-12-29 18:05:23 UTC
Depth: 6.8 km (4.2 mi), shallow
Epicenter: 56.731° N, 153.131° W
Region: Alaska
Strongest shaking: II, weak shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: II, weak shaking
Peak ground acceleration: 0.1% of gravity
Peak ground velocity: -3.2 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Stations used: 108

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 38 in the 60 days after this one and 12 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 ak021gomtwfm (also filed as us7000g7lv). Read Wed, Sep 23, 2026, 1:54 PM UTC.