Alaska earthquakes

M4.2 earthquake 165 km SW of Nikolski, Alaska

A magnitude 4.2 earthquake struck 165 km SW of Nikolski, Alaska on Tue, Aug 11, 2026, 11:42 AM HADT (20:42 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M6.3 89 km SSW of Nikolski, Alaska. This one was a foreshock.

Map

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

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The earthquake

Magnitude: 4.2 (mb), light
Local time: Tue, Aug 11, 2026, 11:42 AM HADT
UTC: 2026-08-11 20:42:54 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 51.764° N, 170.354° W
Region: Alaska
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: 0.4% of gravity
Peak ground velocity: 0.1 cm/s
Map: Automatic

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

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.0 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.05
Depth from: Operator assigned
Station coverage gap: 136°
Stations used: 106

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 since this one and 35 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000tk2d (also filed as aka2026pvqhwi). Read Wed, Sep 30, 2026, 8:14 AM UTC.