Alaska earthquakes

M3.3 earthquake 129 km SSE of Old Harbor, Alaska

A magnitude 3.3 earthquake struck 129 km SSE of Old Harbor, Alaska on Mon, Sep 1, 2025, 11:17 AM AKDT (19:17 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M4.6 125 km SSE of Old Harbor, Alaska. This one was a foreshock.

Womens Bay 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: 3.3 (ML, local (Richter)), minor
Magnitude from: Alaska Earthquake Center
Local time: Mon, Sep 1, 2025, 11:17 AM AKDT
UTC: 2025-09-01 19:17:29 UTC
Depth: 11.8 km (7.3 mi), shallow
Epicenter: 56.211° N, 152.191° W
Region: Alaska
Strongest shaking: I, not felt 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
3.3	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
4.1	mb, body-wave	USGS National Earthquake Information Center	Reviewed · ±0.131 · 16 stations

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.

Stations used: 38

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 27 in the 60 days after this one and 20 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 ak025b7ujm2g (also filed as us7000qt4j). Read Sat, Oct 3, 2026, 12:43 PM UTC.