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From Wikipedia, the free encyclopedia

Map showing volcanoes of the Aleutian Arc.
Map showing volcanoes of the Aleutian Arc.

The Aleutian Arc is a large volcanic arc in the U.S. state of Alaska. It consists of a number of active and dormant volcanoes that have formed as a result of subduction along the Aleutian Trench. Although taking its name from the Aleutian Islands, this term is a geologic grouping rather than a geographic one, and the Aleutian Arc extends through the Alaska Peninsula following the Aleutian Range to the Aleutian Islands.[1]

The Aleutian Arc reflects subduction of the Pacific Plate beneath the North American Plate. It extends 3,000 km (1,900 mi) from the Kamchatka Peninsula in the west to the Gulf of Alaska in the east. Unimak Pass at the southwestern end of the Alaska Peninsula marks the eastward transition from an intra-oceanic in the west to a continental arc in the east. Due to the arcuate geometry of the trench, the relative velocity vector changes from almost trench-normal in the Gulf of Alaska to almost trench-parallel in the west. Along the oceanic part of the subduction zone, convergence varies from 6.3 cm (2.5 in) per year to the north-northwest in the east to 7.4 cm (2.9 in) per year towards the northwest in the west.[2]

Volcanoes

Volcanoes within this arc include:

References

  1. ^ "A Policy for Rapid Mobilization of USGS OBS (RMOBS) - Alaska Volcanoes". Woods Hole Coastal and Marine Science Center. Archived from the original on 2018-09-23. Retrieved 18 November 2018.
  2. ^ DeMets, Charles; Dixon, Timothy (July 1, 1999). "New kinematic models for Pacific-North America motion from 3 Ma to present, 1: Evidence for steady motion and biases in the NUVEL-1A model" (PDF). Geophysical Research Letters. 26 (13): 1921–1924. Retrieved 18 November 2018.

External links

Coordinates: 52°17′N 174°09′W / 52.28°N 174.15°W / 52.28; -174.15

This page was last edited on 18 November 2018, at 22:57
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