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Aogashima
is a volcanic Japanese island in the Philippine Sea.〔Nussbaum, Louis-Frédéric. (2005). ("''Izu Shotō''," ) ''Japan Encyclopedia,'' p. 412.〕 The island is administered by Tokyo and located approximately south of Tokyo and south of Hachijō-jima. It is the southernmost and most isolated inhabited island of the Izu archipelago.〔Gotoh, H. ''et al.'' (2010). ( "Infrastructure Maintenance and Disaster Prevention Measures on Isolated Islands: the Case of the Izu Islands near Tokyo" ) in ''Island Sustainability'' (Favro, S., editor), p. 187.〕
The village of Aogashima administers the island under Hachijō Subprefecture of Tokyo Metropolis. The island's area is and, as of 2014, its population 170. Aogashima is also within the boundaries of the Fuji-Hakone-Izu National Park.
==Geology==
Aogashima is a complex Quaternary volcanic island 3.5 km in length with a maximum width of 2.5 km, formed by the overlapping remnants of at least four submarine calderas. The island is surrounded by very steep rugged cliffs of layered volcanic deposits. The southern coast also rises to a sharp ridge forming one edge of a caldera named with a diameter of 1.5 km. The caldera dominates the island, with one point on its southern ridge, with a height of , as the island's highest point. The caldera is occupied by a secondary cone named .
Still considered a Class-C active volcano by the Japan Meteorological Agency, the last eruption of Aogashima was during a four-year period from 1781–1785.
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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