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Magnitude 4.7 - 56 miles S of Mt. Gareloi
November 13, 2022 00:20:48 AKST (November 13, 2022 09:20:48 UTC)
50.9912°N 179.0577°W Depth 14.3 miles (23 km)
This event has been reviewed by a seismologist
- 73 miles (118 km) SW of Tanaga Volcano
- 88 miles (142 km) SE of Semisopochnoi Island
- 92 miles (149 km) SE of Amchitka
- 94 miles (152 km) SW of Bobrof Island
- 104 miles (168 km) SW of Kanaga Volcano
- 119 miles (192 km) SW of Mt. Moffett
- 120 miles (194 km) SW of Adak
- 127 miles (205 km) SW of Mt. Adagdak
- 129 miles (209 km) SE of Little Sitkin Pass
- 131 miles (212 km) SE of Davidof Island
- 140 miles (226 km) SE of Segula Peak
- Magnitude type: Mb2
- 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.