M3.8 earthquake 105 km SW of Adak, Alaska

A magnitude 3.8 earthquake struck 105 km SW of Adak, Alaska on Thu, Feb 12, 2026, 3:48 AM HAST (13:48 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.6 137 km SW of Adak, 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
3.8	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.091 · 16 stations
3.8	ML, local (Richter)	Alaska Earthquake Center	Reviewed · ±0.1 · 23 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.

Within 100 km, magnitude 1.5 and up: 157 in the 60 days after this one and 57 in the 30 days before it.

The first 60 of 157.

From the USGS Earthquake Hazards Program and its partner networks, event us6000s8jj (also filed as ak2026dadyqs). Read Fri, Oct 2, 2026, 2:42 AM UTC.