The Ogasawara Islands (小笠原諸島) are an archipelago of over 30 subtropical islands some 1000 km directly south of central Tokyo, Japan. Administratively, they are a part of Tokyo. The islands are also known as the Bonin Islands, and the southernmost (uninhabited) group is known as the Volcano Islands.
The only inhabited islands are Chichi-jima (父島, lit. "Father Island") and Haha-jima (母島, "Mother Island"). Access to these islands is possible only via a single weekly overnight ferry from Tokyo, although there are plans to open an airport. Tourists are attracted to the islands by scuba diving and whale watching.
The uninhabited Iō-jima (硫黄島, "Sulphur Island"), better known in English as Iwo Jima, is a part of the Volcano Islands. Access to the island requires special permission.
Bonin Information Service (http://www.bonin-islands.com/)
Categories: Geography of Japan | Tokyo | Ogasawara Islands
The Ogasawara islands are a part of an island arc known geologically as a 'fore arc'.
The crust of the Ogasawara (Bonin) Islands was formed by volcanic activity when subduction began about 45-50 million years ago, and is composed mostly of an andesitic volcanic rock called boninite, which is rich in magnesium oxide, chromium, and silicon dioxide.
Ogasawara was claimed by Japan from the British in 1875 and became part of Tokyo prefecture in 1880.
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