M2.9 earthquake 116 km ESE of Adak, Alaska

A magnitude 2.9 earthquake struck 116 km ESE of Adak, Alaska on Sun, Dec 17, 2023, 12:59 PM HAST (22:59 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M6.1 116 km SE 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
2.9	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.115 · 10 stations
2.4	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: 117 in the 60 days after this one and 43 in the 30 days before it.

The first 60 of 117.

From the USGS Earthquake Hazards Program and its partner networks, event us6000m0gu (also filed as ak023g4v31c9). Read Thu, Oct 1, 2026, 4:21 AM UTC.