M2.8 earthquake 186 km W of Adak, Alaska

A magnitude 2.8 earthquake struck 186 km W of Adak, Alaska on Thu, Feb 5, 2026, 9:14 PM HAST (07:14 UTC), 141 km (88 mi) below the surface.

A larger quake followed: M4.7 225 km W 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
2.8	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.097 · 14 stations
2.7	ML, local (Richter)	Alaska Earthquake Center	Reviewed · ±0.3 · 9 stations

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 80 in the 60 days after this one and 17 in the 30 days before it.

The first 60 of 80.

From the USGS Earthquake Hazards Program and its partner networks, event us6000s72m (also filed as ak2026coqolw). Read Fri, Oct 2, 2026, 3:45 AM UTC.