Magnitude 4.7 - 13 miles SE of Mt. Recheshnoi
November 30, 2020 08:00:07 AKST (November 30, 2020 17:00:07 UTC)
53.0362°N 168.3069°W Depth 34.8 miles (56 km)
This event has been reviewed by a seismologist
- 17 miles (27 km) E of Mt. Vsevidof
- 24 miles (38 km) E of Nikolski
- 28 miles (45 km) S of Okmok Caldera
- 58 miles (94 km) E of Kagamil Island
- 61 miles (98 km) E of Uliaga Island
- 63 miles (102 km) S of Bogoslof Island
- 70 miles (113 km) E of Mt. Cleveland
- 73 miles (118 km) E of Carlisle Island
- 78 miles (126 km) E of Herbert Island
- 82 miles (132 km) SW of Makushin Volcano
- 93 miles (150 km) SW of Unalaska
- 94 miles (152 km) SW of Dutch
- Magnitude type: Ml
- Event type: earthquake
Tectonic Setting of the Aleutian Islands
The Aleutian Arc marks the region where the Pacific Plate subducts into the mantle beneath the North American Plate. It is a seismically active region, evidenced by the thousands of earthquakes occurring each year. Since 1900, this region has hosted several major megathrust earthquakes, including the 1957 M8.6 in the Andreanof Islands, the 1965 M8.7 in the Rat Islands, the 1986 M7.9 and the 1996 M7.9 in the Andreanof Islands, and the 2003 M7.8 in the Rat Islands. Together they have ruptured the entire length of the megathrust boundary in this region. Another notable source of seismicity in the arc is the zone 6-9 miles (10-15 km) wide of intermediate-depth earthquakes within the subducting Pacific Plate, known as the Wadati-Benioff Zone. The largest recorded intermediate-depth earthquake in this region was the 2014 M7.9 Little Sitkin event. A third source of seismicity in this region are shallow earthquakes associated with volcanic processes and crustal faults within the overriding North American Plate. They occur regularly and may produce vigorous aftershock or swarm-like sequences.