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Magnitude 6.8 - 20 miles SE of Amchitka
June 14, 2005 09:10:14 AKDT (June 14, 2005 17:10:14 UTC)
51.3285°N 179.3403°E Depth 22.1 miles (35 km)
This event has been reviewed by a seismologist
- 44 miles (71 km) S of Semisopochnoi Island
- 60 miles (97 km) SE of Little Sitkin Pass
- 61 miles (98 km) SE of Davidof Island
- 70 miles (113 km) SE of Segula Peak
- 86 miles (139 km) W of Mt. Gareloi
- 92 miles (149 km) SE of Kiska Volcano
- 115 miles (186 km) W of Tanaga Volcano
- 143 miles (231 km) W of Bobrof Island
- 156 miles (252 km) W of Kanaga Volcano
- 162 miles (262 km) SE of Buldir Is
- 162 miles (262 km) SE of Buldir Island
- Magnitude type: Mw2
- Event type: earthquake
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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.