M4.5 earthquake 125 km SW of Adak, Alaska

A magnitude 4.5 earthquake struck 125 km SW of Adak, Alaska on Tue, Dec 19, 2023, 4:04 PM HAST (02:04 UTC), 46 km (29 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
4.5	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.045 · 141 stations
4.5	mb, body-wave	Alaska Earthquake Center	Preliminary

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: 142 in the 60 days after this one and 110 in the 30 days before it.

The first 60 of 142.

From the USGS Earthquake Hazards Program and its partner networks, event us7000lk87 (also filed as ak023g9hgozq). Read Sat, Oct 3, 2026, 4:01 PM UTC.