Alaska earthquakes

M4.4 earthquake 100 km SW of Atka, Alaska

A magnitude 4.4 earthquake struck 100 km SW of Atka, Alaska on Wed, Oct 8, 2025, 10:38 AM HADT (19:38 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.9 47 km SE of Adak, 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: 4.4 (Mwr, regional moment), light
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, Oct 8, 2025, 10:38 AM HADT
UTC: 2025-10-08 19:38:50 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.572° N, 175.253° W
Region: Alaska
Strongest shaking: II, weak shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
4.4	Mwr, regional moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.089 · 12 stations
4.2	ML, local (Richter)	Alaska Earthquake Center	Preliminary

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: II, weak shaking
Peak ground acceleration: 0.2% 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.

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: 4.4 Mwr
Nodal plane 1: Strike 199°, dip 28°, rake 49°
Nodal plane 2: Strike 63°, dip 69°, rake 109°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.7 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.09
Depth from: Operator assigned
Station coverage gap: 147°
Stations used: 72

Nearby

Within 100 km, magnitude 1.5 and up: 32 in the 60 days after this one and 11 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 us6000rfp7 (also filed as ak025cx1k0fn). Read Fri, Oct 2, 2026, 11:44 AM UTC.