Alaska earthquakes

M3.4 earthquake 3 km SE of Big Lake, Alaska

A magnitude 3.4 earthquake struck 3 km SE of Big Lake, Alaska on Sat, Sep 11, 2021, 8:20 AM AKDT (16:20 UTC), 37 km (23 mi) below the surface.

Big Lake forecast More in Alaska

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 3.4 (ml), minor
Local time: Sat, Sep 11, 2021, 8:20 AM AKDT
UTC: 2021-09-11 16:20:55 UTC
Depth: 37.1 km (23.1 mi), shallow
Epicenter: 61.498° N, 149.909° W
Region: Alaska
Felt reports: 25
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: 0.6% of gravity
Peak ground velocity: -1.6 cm/s
Map: Automatic

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

Did you feel it?

25 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

How well it is located

Reviewed by a seismologist.

Stations used: 111

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 196 in the 60 days after this one and 114 in the 30 days before it.

After

The first 60 of 196.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021boc5ho7 (also filed as us7000facd). Read Tue, Sep 29, 2026, 12:46 PM UTC.