Alaska earthquakes

M3.9 earthquake 150 km WSW of Adak, Alaska

A magnitude 3.9 earthquake struck 150 km WSW of Adak, Alaska on Sat, Sep 12, 2026, 5:08 PM HADT (02:08 UTC), 39 km (24 mi) below the surface.

Map

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The earthquake

Magnitude: 3.9 (mb), minor
Local time: Sat, Sep 12, 2026, 5:08 PM HADT
UTC: 2026-09-13 02:08:42 UTC
Depth: 38.7 km (24.1 mi), shallow
Epicenter: 51.216° N, 178.530° 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: 0.8% of gravity
Peak ground velocity: 0.2 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. If you felt it, tell the USGS: every report sharpens the shaking map.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.0 km horizontally, 12.3 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 188°, poorly surrounded by stations
Stations used: 46

Nearby

Within 100 km, magnitude 1.5 and up: 25 since this one and 137 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 us7000th2x (also filed as aka2026sddwmu). Read Tue, Sep 22, 2026, 9:07 AM UTC.