Alaska earthquakes

M3.5 earthquake 237 km SE of Chiniak, Alaska

A magnitude 3.5 earthquake struck 237 km SE of Chiniak, Alaska on Thu, Oct 23, 2025, 5:29 AM AKDT (13:29 UTC), 14 km (9 mi) below the surface.

A larger quake followed: M5.0 258 km ESE of Chiniak, Alaska. This one was a foreshock.

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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: 3.5 (ml), minor
Local time: Thu, Oct 23, 2025, 5:29 AM AKDT
UTC: 2025-10-23 13:29:44 UTC
Depth: 14.1 km (8.8 mi), shallow
Epicenter: 56.188° N, 149.379° W
Region: Alaska
Strongest shaking: I, not felt shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

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

Strongest estimated: I, not felt 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?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 10.0 km horizontally, 8.4 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 206°, poorly surrounded by stations
Stations used: 41

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 1 in the 30 days before it.

After

Before

3.2177 km SE of Chiniak, AlaskaTue, Oct 14, 10:41 AM AKDT · 349 days ago · 10 km deep · 61 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000rivf (also filed as ak025dlqzt0a). Read Mon, Sep 28, 2026, 12:38 PM UTC.