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Magnitude 2.7 - 44 miles SE of Amchitka
May 15, 2023 05:32:40 AKDT (May 15, 2023 13:32:40 UTC)
51.0568°N 179.6818°E Depth 10.1 miles (16 km)
This event has been reviewed by a seismologist
- 62 miles (100 km) S of Semisopochnoi Island
- 83 miles (134 km) SW of Mt. Gareloi
- 84 miles (136 km) SE of Little Sitkin Pass
- 85 miles (137 km) SE of Davidof Island
- 94 miles (152 km) SE of Segula Peak
- 110 miles (178 km) SW of Tanaga Volcano
- 115 miles (186 km) SE of Kiska Volcano
- 137 miles (222 km) SW of Bobrof Island
- 148 miles (239 km) SW of Kanaga Volcano
- 165 miles (267 km) W of Mt. Moffett
- 167 miles (270 km) W of Adak
- 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.