M2.5 earthquake 77 km SW of Nanwalek, Alaska

A magnitude 2.5 earthquake struck 77 km SW of Nanwalek, Alaska on Thu, Oct 16, 2025, 7:25 AM AKDT (15:25 UTC), 58 km (36 mi) below the surface.

Automatic solution: the magnitude and location may still be revised.

A larger quake followed: M4.1 24 km SE of Kokhanok, 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
2.5	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
2.6	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.044 · 67 stations

No one has reported feeling this quake to the USGS.

An automatic solution; a seismologist may revise it.

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

Within 100 km, magnitude 1.5 and up: 186 in the 60 days after this one and 56 in the 30 days before it.

The first 60 of 186.

From the USGS Earthquake Hazards Program and its partner networks, event ak025da7e91a (also filed as us6000rhjy). Read Fri, Oct 2, 2026, 3:43 PM UTC.