Monday, January 3, 2011 4:25:35 PM
The group consists of three islands south of the Bonin Islands, and are all active volcanoes lying atop an island arc, the Izu-Marianas arc, that stretches south to the Marianas. Their names are: Kita Iwo Jima (北硫黄島), Iwo Jima (硫黄島), and Minami Iwo Jima (南硫黄島}.
Kita Iwo Jima consists of the heavily eroded peak of a stratovolcano, which rises 792 m above sea level. An Undersea volcano, Fukutoku-Okanoba, in the Volcano Islands erupted in February 2010.
The Izu-Bonin-Mariana (IBM) arc system extends over 2800 km. Much of the IBM arc system is submerged below sealevel. The IBM arc system lies along the eastern margin of the Philippine Sea Plate in the Western Pacific Ocean. The IBM arc system formed as a result of subduction of the western Pacific plate. The IBM arc system now subducts mid-Jurassic to Early Cretaceous lithosphere, with younger lithosphere in the north and older lithosphere in the south, including the oldest (~170 million years old) oceanic crust. Subduction rates vary from ~2 cm per year in the south to 6 cm in the north.
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