M4.7 earthquake 134 km SSE of Old Harbor, Alaska

A magnitude 4.7 earthquake struck 134 km SSE of Old Harbor, Alaska on Mon, Sep 1, 2025, 3:07 AM AKDT (11:07 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M4.9 128 km SE of Old Harbor, Alaska. This one was a foreshock.

Map

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

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
4.7	mb, body-wave	Alaska Earthquake Center	Preferred · Preliminary
4.7	mb, body-wave	USGS National Earthquake Information Center	Reviewed · ±0.194 · 8 stations

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

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.7 and up: 45 in the 60 days after this one and 2 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ak025b7pq04v (also filed as us7000qt05). Read Sat, Oct 3, 2026, 1:42 PM UTC.