Alaska earthquakes

M3.8 earthquake 60 km SW of Nanwalek, Alaska

A magnitude 3.8 earthquake struck 60 km SW of Nanwalek, Alaska on Sat, Nov 20, 2021, 11:05 PM AKST (08:05 UTC), 71 km (44 mi) below the surface.

A larger quake followed: M4.6 71 km NNE of Aleneva, Alaska. This one was a foreshock.

Homer 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: 3.8 (ml), minor
Local time: Sat, Nov 20, 2021, 11:05 PM AKST
UTC: 2021-11-21 08:05:47 UTC
Depth: 70.9 km (44.1 mi), intermediate-depth
Epicenter: 58.992° N, 152.709° W
Region: Alaska
Felt reports: 2
Strongest shaking: III, 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: III, weak shaking
Peak ground acceleration: 0.5% of gravity
Peak ground velocity: -2.8 cm/s
Map: Automatic

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

Did you feel it?

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

How well it is located

Reviewed by a seismologist.

Stations used: 251

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 148 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 ak021exmgfhw (also filed as us7000fvwy). Read Sun, Sep 27, 2026, 11:22 PM UTC.