M3.1 earthquake 129 km SW of Nikolski, Alaska

A magnitude 3.1 earthquake struck 129 km SW of Nikolski, Alaska on Sat, Feb 15, 2025, 3:33 AM HAST (13:33 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.1 181 km E of Atka, 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
3.1	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.097 · 14 stations
2.8	ML, local (Richter)	Alaska Earthquake Center	Preliminary

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 63 in the 60 days after this one and 28 in the 30 days before it.

The first 60 of 63.

From the USGS Earthquake Hazards Program and its partner networks, event us6000py05 (also filed as ak02524anqs3). Read Fri, Oct 2, 2026, 9:44 PM UTC.