Alaska earthquakes

M3.6 earthquake 52 km SSW of Alcan Border, Alaska

A magnitude 3.6 earthquake struck 52 km SSW of Alcan Border, Alaska on Tue, Oct 5, 2021, 10:24 AM AKDT (18:24 UTC), 9 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: 3.6 (ml), minor
Local time: Tue, Oct 5, 2021, 10:24 AM AKDT
UTC: 2021-10-05 18:24:29 UTC
Depth: 9.1 km (5.7 mi), shallow
Epicenter: 62.240° N, 141.543° W
Region: Alaska
Felt reports: 1
Strongest shaking: IV, light 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: IV, light shaking
Peak ground acceleration: 1.7% of gravity
Peak ground velocity: -0.6 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 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: Oblique reverse
Moment magnitude: 3.7 Mwr
Nodal plane 1: Strike 296°, dip 60°, rake 145°
Nodal plane 2: Strike 45°, dip 60°, rake 35°

How well it is located

Reviewed by a seismologist.

Stations used: 189

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 9 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 ak021cs29hm0 (also filed as us6000frzx). Read Mon, Sep 28, 2026, 8:37 AM UTC.