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Magnitude 2.2 - 82 miles SE of Akutan
May 18, 2023 05:39:04 AKDT (May 18, 2023 13:39:04 UTC)
53.2943°N 164.3647°W Depth 15.9 miles (25 km)
This event has been reviewed by a seismologist
- 85 miles (137 km) S of Westdahl Peak
- 89 miles (144 km) SE of Akutan Pass
- 96 miles (155 km) S of Fisher Caldera
- 97 miles (157 km) SE of Dutch
- 98 miles (158 km) SE of Unalaska
- 102 miles (165 km) S of Shishaldin Volcano
- 105 miles (170 km) S of Isanotski Peaks
- 108 miles (175 km) S of Roundtop Mountain
- 113 miles (183 km) E of Makushin Volcano
- 114 miles (184 km) S of False Pass
- 138 miles (223 km) SW of Frosty Peak
- Magnitude type: Ml2
- 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.