A precise bathymetric map of the world’s deepest seafloor,Challenger Deep in the Mariana Trench |
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| Authors: | Masao Nakanishi Jun Hashimoto |
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| Institution: | (1) Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan;(2) Faculty of Fisheries, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan |
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| Abstract: | Data from three bathymetric surveys by R/V Kairei using a 12-kHz multibeam echosounder and differential GPS were used to create an improved topographic model of the Challenger
Deep in the southwestern part of the Mariana Trench, which is known as the deepest seafloor in the world. The strike of most
of the elongated structures related to plate bending accompanied by subduction of the Pacific plate is N70°E and is not parallel
to the trench axis. The bending-related structures were formed by reactivation of seafloor spreading fabric. Challenger Deep
consists of three en echelon depressions along the trench axis, each of which is 6–10 km long, about 2 km wide, and deeper
than 10,850 m. The eastern depression is the deepest, with a depth of 10,920 ± 5 m. |
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