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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Geology of Sumatra Trench ： ウィキペディア英語版 Geology of Sumatra Trench The Sumatra Trench belongs to the Sunda Trench or Java Trench. The name ''Java'' comes from Java Islands, which means ''the land of harvest'' in Sanskrit. Also, in India's epic ''Ramayana'', it is described as a place full of fertile lands and beautiful sunshine. The Sunda subduction zone is located in the east part of Indian ocean, and is about 300 km from the southwest coast of Sumatra and Java islands. It extends over 5000 km long, starting from Burma in the northwest and ending at Sumba island in the southeast. ==Geological settings== The Java trench was generated by the oblique subduction of the Indo-Australian Plate into the Sunda plate at a rate of 61mm/y(in the south) and 51mm/y(in the north). The oceanic crust being subducted via this accretionary margin has variable ages (40 to 100 Ma) and structure along the trench.〔 There is also research showing that arc parallel dextral strike-slip fault systems(i.e. the Great Sumatra fault) developed on the landward side of the Sunda forearc to absorb part of the dextral motions associated with the oblique plate convergence. After the disastrous 2004 Sumatran tsunami, more and more researchers begin to study this area. The trench slope is now being considered as a result of folds and faults in the area which were originated from the local seafloor deformation. Seismic profiles at Sumatra Trench shows that, the down-going Indo-Australian plate has its slip vectors rotate to a NE direction. This indicates that the plate motion is dominated by the dextral shear inside the Indo-Australian plate in the order of 3.6–4.9 cm/yr. Transpressive deformation of the subducting plate edge is the primary to absorb the shear force. At the southeast section of this area, the Sumatra fault zone bends towards south and merges into the extensional south striking fault system of the Sumatra trait. The Sumatra Fault Zone (SFZ) is the most worth noting area on the Eurasian plate near Sumatra trench. Within the Sumatra Fault Zone lies the majority of the right-lateral stress from the relative motion between the Indo-Australian and Eurasian plates. The Sumatra Fault Zone (SFZ) meets the south trending extensional faulting system in Sunda Strait in Semangka. The materials from the fault zone can generate submarine pull-apart grabens. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Geology of Sumatra Trench」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.