Alaska earthquakes

M4.0 earthquake 75 km N of Chickaloon, Alaska

A magnitude 4.0 earthquake struck 75 km N of Chickaloon, Alaska on Sun, Jun 6, 2021, 9:55 AM AKDT (17:55 UTC), 42 km (26 mi) below the surface.

Susitna North 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: 4.0 (ml), light
Local time: Sun, Jun 6, 2021, 9:55 AM AKDT
UTC: 2021-06-06 17:55:16 UTC
Depth: 42.0 km (26.1 mi), shallow
Epicenter: 62.467° N, 148.243° W
Region: Alaska
Felt reports: 6
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: -1.7 cm/s
Map: Automatic

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

Did you feel it?

6 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Normal
Moment magnitude: 4.1 Mwr
Nodal plane 1: Strike 39°, dip 45°, rake -114°
Nodal plane 2: Strike 251°, dip 50°, rake -68°

How well it is located

Reviewed by a seismologist.

Stations used: 106

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 162 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of 162.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak02177xtoen (also filed as us7000eai4). Read Sat, Sep 26, 2026, 5:33 AM UTC.