Magnitude 2.3 - 29 miles SE of Mt. Recheshnoi

March 9, 2023 14:46:27 AKST (March 9, 2023 23:46:27 UTC)
52.8096°N 168.1592°W Depth 15.8 miles (25 km)

This event has been reviewed by a seismologist

31 miles (50 km) SE of Mt. Vsevidof
31 miles (50 km) E of Nikolski
43 miles (69 km) S of Okmok Caldera
66 miles (107 km) E of Kagamil Island
69 miles (111 km) E of Uliaga Island
75 miles (121 km) E of Mt. Cleveland
78 miles (126 km) S of Bogoslof Island
79 miles (128 km) E of Carlisle Island
82 miles (132 km) E of Herbert Island
90 miles (145 km) SW of Makushin Volcano
99 miles (160 km) SW of Unalaska
101 miles (163 km) SW of Dutch

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.