Alaska earthquakes

M3.3 earthquake 20 km ESE of Pedro Bay, Alaska

A magnitude 3.3 earthquake struck 20 km ESE of Pedro Bay, Alaska on Sun, Dec 5, 2021, 3:43 AM AKST (12:43 UTC), 151 km (94 mi) below the surface.

A larger quake followed: M5.9 58 km E of Port Alsworth, 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: 3.3 (ml), minor
Local time: Sun, Dec 5, 2021, 3:43 AM AKST
UTC: 2021-12-05 12:43:53 UTC
Depth: 151.0 km (93.8 mi), intermediate-depth
Epicenter: 59.732° N, 153.749° 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: -4.4 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: 176

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

After

The first 60 of at least 200.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021fkul6kh (also filed as us6000g99u). Read Mon, Sep 28, 2026, 7:20 AM UTC.