Magnitude 1.6 - 17 miles W of Mt. Gareloi

May 13, 2022 22:11:51 AKDT (May 14, 2022 06:11:51 UTC)
51.7644°N 179.1827°W Depth 4.6 miles (7 km)

This event has been reviewed by a seismologist

45 miles (72 km) W of Tanaga Volcano
53 miles (85 km) E of Semisopochnoi Island
75 miles (121 km) W of Bobrof Island
80 miles (129 km) E of Amchitka
87 miles (141 km) W of Kanaga Volcano
104 miles (168 km) E of Little Sitkin Pass
105 miles (170 km) W of Mt. Moffett
107 miles (173 km) E of Davidof Island
108 miles (175 km) W of Adak
112 miles (181 km) W of Mt. Adagdak
116 miles (188 km) E 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.