Alaska earthquakes

M3.9 earthquake 102 km N of Yakutat, Alaska

A magnitude 3.9 earthquake struck 102 km N of Yakutat, Alaska on Mon, Dec 8, 2025, 1:57 AM AKST (10:57 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M5.7 111 km N of Yakutat, Alaska. This one was a foreshock.

Yakutat 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: 3.9 (Mwr, regional moment), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Mon, Dec 8, 2025, 1:57 AM AKST
UTC: 2025-12-08 10:57:41 UTC
Depth: 5.0 km (3.1 mi), shallow
Epicenter: 60.468° N, 139.613° W
Region: Alaska
Strongest shaking: IV, light 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
3.9	Mwr, regional moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.063 · 24 stations
3.98	ML, local (Richter)	Alaska Earthquake Center	Preliminary · ±0.2430986412356736 · 48 stations

Shaking

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

Strongest estimated: IV, light shaking
Peak ground acceleration: 5.9% of gravity
Peak ground velocity: 1.9 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: Strike-slip
Moment magnitude: 3.9 Mwr
Nodal plane 1: Strike 60°, dip 53°, rake -23°
Nodal plane 2: Strike 165°, dip 72°, rake -141°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 1.7 km horizontally, 0.8 km in depth
Magnitude uncertainty: ±0.06
Depth from: Operator assigned
Station coverage gap: 52°
Stations used: 27

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 202 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 202.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000rtcq (also filed as ak2025ycukua). Read Thu, Oct 1, 2026, 10:36 AM UTC.