Magnitude 4.2 - 65 miles SW of Buldir Is
June 11, 2019 20:39:45 AKDT (June 12, 2019 04:39:45 UTC)
51.8211°N 174.6520°E Depth 29.2 miles (47 km)
This event has been reviewed by a seismologist
- 65 miles (105 km) S of Shemya Is
- 66 miles (107 km) SW of Buldir Island
- 97 miles (157 km) SE of Attu
- 127 miles (205 km) W of Kiska Volcano
- 149 miles (241 km) W of Segula Peak
- 157 miles (254 km) W of Davidof Island
- 160 miles (259 km) W of Little Sitkin Pass
- 187 miles (303 km) W of Amchitka
- 211 miles (342 km) W of Semisopochnoi Island
- 280 miles (453 km) W of Mt. Gareloi
- 307 miles (497 km) W of Tanaga Volcano
- Magnitude type: Ml2
- 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.