During the month of December 2023, the Alaska Earthquake Center reported 3399 earthquakes within the state with magnitude ranging between 0.6 and 6.1, and depth between 0 and 250 km. The largest event was magnitude 6.1 that occurred on December 21 at 05:55:57 AKST (December 21, 14:55:57 UTC), 54 miles S of Atka Pass. About 50 aftershocks followed this event.  All earthquakes of magnitude 4.0 and greater occurred along the subduction zone, except the M 4.1 event,  45 miles S of Kaktovik.

We also reported seismic sources others than regional tectonic earthquakes. Of these, 37 were suspected quarry blasts (M0.9-1.8) located in the vicinity of either Fort Knox or Usibelli mines in interior Alaska, 51 ice quakes, primarily located in the Prince William Sound, Icy Bay, and Yakutat Bay areas, and 45 seismic events associated with volcanic activity (M0.9-3.2).  

Nine earthquakes were reported as being felt in December.