Alaska earthquakes

M3.9 earthquake 118 km N of Yakutat, Alaska

A magnitude 3.9 earthquake struck 118 km N of Yakutat, Alaska on Sat, Dec 6, 2025, 10:29 PM AKST (07:29 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M5.8 89 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: Sat, Dec 6, 2025, 10:29 PM AKST
UTC: 2025-12-07 07:29:23 UTC
Depth: 3.9 km (2.5 mi), shallow
Epicenter: 60.603° N, 139.920° W
Region: Alaska
Strongest shaking: IV, light shaking
PAGER alert: Green
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 · ±0.057 · 30 stations
4.22	ML, local (Richter)	Alaska Earthquake Center	Reviewed · ±0.27745997704087877 · 67 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: 5.4% of gravity
Peak ground velocity: 2.0 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.

Estimated impact

The USGS PAGER system estimates deaths and economic losses from the shaking and the population and buildings exposed to it.

Alert level: Green: little or no damage or loss of life expected

Deaths: estimated chance of each range
Range	Chance
Under 1	65%
1 to 10	30%
10 to 100	4%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Economic losses: estimated chance of each range
Range, million USD	Chance
Under 1	65%
1 to 10	30%
10 to 100	4%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Fault motion and ground failure

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

Faulting: Reverse (thrust)
Moment magnitude: 3.9 Mwr
Nodal plane 1: Strike 41°, dip 48°, rake 86°
Nodal plane 2: Strike 227°, dip 42°, rake 95°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 1.4 km horizontally, 4.4 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 70°
Stations used: 49

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 us6000rt3f (also filed as ak2025yarupn). Read Thu, Oct 1, 2026, 11:05 AM UTC.