M4.8 earthquake 102 km SSW of Nikolski, Alaska

A magnitude 4.8 earthquake struck 102 km SSW of Nikolski, Alaska on Fri, Dec 12, 2025, 9:14 AM AKST (18:14 UTC), 13 km (8 mi) below the surface.

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
4.8	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.035 · 257 stations
4.6	ML, local (Richter)	Alaska Earthquake Center	Reviewed · ±0.3 · 48 stations

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

1 person reported to the USGS what they felt; the strongest reported shaking was I, not felt shaking.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.8 and up: 31 in the 60 days after this one and 24 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us6000rui6 (also filed as ak2025ykrvdu). Read Sat, Oct 3, 2026, 9:55 PM UTC.