A LANDSLIDE CLAY OF THE SEMPOSHI SLIDE OCCURRED WITHIN THE SEMPOSHI FORMATION OF THE NEMURO GROUP IN THE WEST COAST AREA OF AKKESHI BAY, EASTERN HOKKAIDO, JAPAN

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概要

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• The Akkeshi Bay and Lake Akkeshi area faces the Pacific Ocean along the eastern coast of Hokkaido, Japan. A number of landslide-related disasters have occurred within this area. The bedrock of the landslides consists primarily of pelitic rocks, sandstone, conglomerate, volcaniclastic rocks, and andesite lava of the 3,000-m-thick Upper Cretaceous-Paleogene Nemuro Group, which comprises the Nokkamappu, Otamura, Monshizu, Oborogawa, Semposhi, Shiomi, and Konbumori Formations in ascending order in the west coast area of Akkeshi Bay. The bedrock of the 1959 Semposhi Slide is primarily composed of siltstone from the Upper Siltstone Member of the Semposhi Formation. Mineral composition of the landslide clay is primarily composed of calcite, with lesser interstratified illite/smectite minerals, quartz, plagioclase, kaolin minerals, and illite. The smectite-layer content and Reichweite of the interstratified illite/smectite minerals in the landslide clay is approximately 90% and g=0, respectively. It is therefore suggested that the landslide occurred within siltstone from the Upper Member of the Semposhi Formation is closely related to the interstratified illite/smectite mineralization by diagenesis. The landslide is classified as a diagenetic zone landslide on the basis of bedrock geology.

• 日本粘土学会の論文

著者

• Maeda Hiroyuki

  Department Of Civil And Environmental Engineering Faculty Of Engineering National University Corpora

• NAYA HIROSHI

  The Main Office of Meiji Consultants Co., Ltd.

• HASEBE SHIGENORI

  Tokyo Branch of Aizawa Concrete Co., Ltd.

• KOHNO MASANORI

  Civil Engineering Course, Graduate School of Engineering, National University Corporation Kitami Ins

• Naya Hiroshi

  The Main Office Of Meiji Consultants Co. Ltd.

• Kohno Masanori

  Civil Engineering Course Graduate School Of Engineering National University Corporation Kitami Insti

• Hasebe Shigenori

  Tokyo Branch Of Aizawa Concrete Co. Ltd.

• KOHNO MASANORI

  Graduate School of Engineering, National University Corporation Kitami Institute of Technology

• MAEDA Hiroyuki

  Department of Chemistry, Materials Engineering, Kansai University

• MAEDA Hiroyuki

  Departhents of Biochemistry and Surgery, Fukui Medical School

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