Magnitude 2.3 - 45 miles S of Mt. Gareloi

May 23, 2023 08:44:14 AKDT (May 23, 2023 16:44:14 UTC)
51.1756°N 179.1403°W Depth 13.3 miles (21 km)

This event has been reviewed by a seismologist

65 miles (105 km) SW of Tanaga Volcano
76 miles (123 km) SE of Semisopochnoi Island
84 miles (136 km) E of Amchitka
89 miles (144 km) SW of Bobrof Island
100 miles (162 km) SW of Kanaga Volcano
116 miles (188 km) SW of Mt. Moffett
117 miles (189 km) SW of Adak
119 miles (192 km) SE of Little Sitkin Pass
121 miles (196 km) SE of Davidof Island
123 miles (199 km) SW of Mt. Adagdak
131 miles (212 km) SE of Segula Peak

Magnitude type: M_l²
Event type: earthquake

Tectonic Setting of the Aleutian Islands

The world's largest earthquakes originate along convergent plate boundaries such as the Aleutian megathrust. Starting in 1938, a series of three great earthquakes ruptured the subduction zone along its entire length from the Alaska Peninsula to the western Aleutians with the exception of a small gap near the Shumagin Islands. The sequence began with a M8.2 earthquake southwest of Kodiak Island. A M8.6 in the Andreanof Islands followed in 1957, and the sequence concluded with the Rat Islands M8.7 in 1965. The Shumagin Gap still has not ruptured, but GPS observations suggest that little strain has built up in this region.

Another notable source of seismicity in the arc are the intermediate depth earthquakes within the subducting Pacific Plate, known as the Wadati-Benioff zone. The largest recorded earthquake of this kind was the 2014 M7.9 Little Sitkin event. Shallow earthquakes associated with volcano processes and crustal faults within the overriding North American plate occur regularly and may produce vigorous aftershock or swarm-like sequences.