Alaska earthquakes

M4.2 earthquake 99 km N of Yakutat, Alaska

A magnitude 4.2 earthquake struck 99 km N of Yakutat, Alaska on Sun, Dec 7, 2025, 3:55 AM AKST (12:55 UTC), 5 km (3 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: 4.2 (Mwr, regional moment), light
Magnitude from: USGS National Earthquake Information Center
Local time: Sun, Dec 7, 2025, 3:55 AM AKST
UTC: 2025-12-07 12:55:23 UTC
Depth: 5.0 km (3.1 mi), shallow
Epicenter: 60.437° N, 139.546° W
Region: Alaska
Strongest shaking: V, moderate shaking
PAGER alert: Green
Tsunami flag: Yes: a large quake in an oceanic region
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
4.2	Mwr, regional moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.063 · 24 stations
4.36	ML, local (Richter)	Alaska Earthquake Center	Reviewed · ±0.2674879357716066 · 64 stations
4.3	ML, local (Richter)	NOAA National Tsunami Warning Center	Reviewed · 41 stations

Tsunami

The USGS flags a quake this large in an oceanic region. The flag does not mean a tsunami happened; the tsunami warning centers decide that, and their messages are below when they issued any.

Tsunami Information Statement from the NTWC. Read the message

Current tsunami warnings: tsunami.gov. Warnings in force in the US also appear on our alerts pages.

Shaking

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

Strongest estimated: V, moderate shaking
Peak ground acceleration: 6.5% of gravity
Peak ground velocity: 2.9 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.

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: Strike-slip
Moment magnitude: 4.2 Mwr
Nodal plane 1: Strike 136°, dip 87°, rake 163°
Nodal plane 2: Strike 227°, dip 73°, rake 3°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 2.9 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.06
Depth from: Operator assigned
Station coverage gap: 80°
Stations used: 94

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 201 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 201.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000rt58 (also filed as at00t6wh8b, ak2025ybcpkh). Read Sat, Oct 3, 2026, 10:50 PM UTC.