Magnitude 5.7 - 27 miles E of Okmok Caldera

January 10, 2007 01:01:16 AKST (January 10, 2007 10:01:16 UTC)
53.5596°N 167.5215°W Depth 4.0 miles (6 km)

This event has been reviewed by a seismologist

33 miles (53 km) SW of Makushin Volcano
34 miles (55 km) SE of Bogoslof Island
46 miles (74 km) SW of Unalaska
47 miles (76 km) SW of Dutch
50 miles (81 km) NE of Mt. Recheshnoi
57 miles (92 km) NE of Mt. Vsevidof
67 miles (108 km) SW of Akutan Pass
70 miles (113 km) NE of Nikolski
82 miles (132 km) SW of Akutan
99 miles (160 km) NE of Kagamil Island
99 miles (160 km) E of Uliaga Island

Magnitude type: M_w²
Event type: N/A

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.