Alaska earthquakes

M3.9 earthquake 263 km SE of Chiniak, Alaska

A magnitude 3.9 earthquake struck 263 km SE of Chiniak, Alaska on Fri, Jun 11, 2021, 12:35 AM AKDT (08:35 UTC), 7 km (5 mi) below the surface.

A larger quake followed: M4.0 269 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: 3.9 (mb), minor
Local time: Fri, Jun 11, 2021, 12:35 AM AKDT
UTC: 2021-06-11 08:35:17 UTC
Depth: 7.4 km (4.6 mi), shallow
Epicenter: 55.962° N, 149.186° W
Region: Alaska
Felt reports: 1
Strongest shaking: I, not felt 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: I, not felt shaking
Peak ground acceleration: 0.0% of gravity
Peak ground velocity: -6.4 cm/s
Map: Automatic

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

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 7.5 km horizontally, 7.1 km in depth
Magnitude uncertainty: ±0.18
Depth from: From location
Station coverage gap: 143°
Stations used: 89

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 42 in the 60 days after this one and 26 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 us7000ec1d (also filed as ak0217g21at8). Read Thu, Sep 24, 2026, 11:10 AM UTC.