Alaska earthquakes

M5.0 earthquake 258 km ESE of Chiniak, Alaska

A magnitude 5.0 earthquake struck 258 km ESE of Chiniak, Alaska on Tue, Dec 16, 2025, 2:35 PM AKST (23:35 UTC), 10 km (6 mi) below the surface.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 5.0 (mww), moderate
Local time: Tue, Dec 16, 2025, 2:35 PM AKST
UTC: 2025-12-16 23:35:25 UTC
Depth: 9.7 km (6.0 mi), shallow
Epicenter: 56.379° N, 148.674° W
Region: Alaska
Felt reports: 1
Strongest shaking: II, weak shaking
Tsunami flag: Yes: a large quake in an oceanic region
Status: Reviewed by a seismologist

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: II, weak shaking
Peak ground acceleration: 0.0% of gravity
Peak ground velocity: 0.0 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Aftershock forecast

The chance of at least one aftershock this large or larger, from the USGS operational aftershock forecast, issued Tue, Sep 22, 2026, 11:35 PM UTC. The USGS updates it as the sequence unfolds.

Within	M3+	M4+	M5+	M6+	M7+
1 day	Under 1%	Under 1%	Under 1%	Under 1%	Under 1%
1 week	1%	Under 1%	Under 1%	Under 1%	Under 1%
1 month	5%	Under 1%	Under 1%	Under 1%	Under 1%
1 year	33%	5%	Under 1%	Under 1%	Under 1%

In the coming week the USGS expects about 0 aftershocks of magnitude 3 or more, and most likely between 0 and 0.

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: 5.0 Mww
Nodal plane 1: Strike 253°, dip 76°, rake 6°
Nodal plane 2: Strike 162°, dip 84°, rake 166°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 8.3 km horizontally, 4.3 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 84°
Stations used: 94

Nearest places

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

Nearby

Within 100 km, magnitude 2.0 and up: 32 in the 60 days after this one and 7 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 us6000rvd3 (also filed as at00t7dyv2, usauto6000rvd3, ak2025yslivi). Read Mon, Sep 28, 2026, 4:37 AM UTC.