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Hachijō-jima
is a volcanic Japanese island in the Philippine Sea.〔Nussbaum, Louis-Frédéric. (2005). ("''Izu Shotō''," ) ''Japan Encyclopedia,'' p. 412; Ponsonby-Fane, Richard. (1962). ''Sovereign and Subject,'' p. 332.〕 The island is administered by Tōkyō and located approximately south of the Special Wards of Tōkyō. It is the southernmost and most isolated of the Izu Seven Islands group of the seven northern islands of the Izu archipelago. The chief community on the island is Mitsune; other communities are Nakanogo, Kashitate, and Ōkago all of which are administratively part of the town of Hachijō under Hachijō Subprefecture of Tokyo Metropolis. As of 2009, the island's population was 8,363 people living on 63 km2. The highest elevation is about 850 m. Hachijō-jima is also within the boundaries of the Fuji-Hakone-Izu National Park.
==Geology==
Hachijō-jima is a compound volcanic island 14.5 km in length with a maximum width of 8 km. The island is formed from two stratovolcanoes. , also called , has a height of , and was active from 100,000 BC to around 1700 BC, has eroded flanks and retains a distinctive caldera. , also called ) is the highest point on the island and is the tallest peak of the entire Izu island chain, with a height of . The summit is occupied by a shallow caldera with a diameter of 400 meters and a depth of around 50 meters. It is rated as a Class-C active volcano by the Japan Meteorological Agency with eruptions recorded in recent history in 1487, 1518, 1522–1523, 1605 and 1606. In between these two peaks are over 20 flank volcanoes and pyroclastic cones.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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