M4.6 earthquake 137 km SW of Adak, Alaska

A magnitude 4.6 earthquake struck 137 km SW of Adak, Alaska on Tue, Feb 17, 2026, 1:12 PM HAST (23:12 UTC), 10 km (6 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
4.6	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.044 · 153 stations
4.8	ML, local (Richter)	Alaska Earthquake Center	Reviewed · ±0.1 · 36 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 1.6 and up: 137 in the 60 days after this one and 48 in the 30 days before it.

The first 60 of 137.

From the USGS Earthquake Hazards Program and its partner networks, event us6000s9w4 (also filed as ak2026dkbhpf). Read Fri, Oct 2, 2026, 8:59 AM UTC.