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Kōzu-shima
is a volcanic Japanese island in the Philippine Sea.〔Nussbaum, Louis-Frédéric. (2005). ("''Izu Shotō''," ) ''Japan Encyclopedia,'' p. 412.〕 The island is administered by Tōkyō and located approximately northwest of the Miyake-jima and southwest of the Nii-jima. It is one of the Izu Seven Islands group of the seven northern islands of the Izu archipelago.
Kōzushima is administratively part of Kōzushima Village under Ōshima Subprefecture of Tokyo Metropolis. As of 2009, the island's population was 8,363. Kōzushima is also within the boundaries of the Fuji-Hakone-Izu National Park.
==Geology==
Kōzu-shima is a compound volcanic island 6 km in length with a maximum width of 4 km. The island is formed from a cluster of eighteen lava domes, with rhyolite and pyroclastic ash deposits. The highest of these lava domes, , has a height of , and was last active in 838 AD per the ancient Japanese history Shoku Nihon Kōki. Compared with most of the other islands in the Izu archipelago, Kōzu-shima is relatively flat, with small eroded hills, and lacks the high coastal cliffs found on the other islands. Earthquake swarms have occurred at Kōzu-shima during the 20th century.
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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