M2.8 earthquake 168 km WSW of Adak, Alaska

A magnitude 2.8 earthquake struck 168 km WSW of Adak, Alaska on Tue, Dec 19, 2023, 4:43 PM HAST (02:43 UTC), 69 km (43 mi) below the surface.

A larger quake followed: M4.3 180 km WSW 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 · ±0.091 · 16 stations
2.6	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: 128 in the 60 days after this one and 67 in the 30 days before it.

The first 60 of 128.

From the USGS Earthquake Hazards Program and its partner networks, event us6000m1w6 (also filed as ak023g9hoz6u). Read Thu, Oct 1, 2026, 8:58 AM UTC.