The Gakenoyu active fault swarm at the western foot of Mt. Takabotti, southeastern part of the Matsumoto Basin, central Japan(<Special Issue>the deep structure and tectonic processes of inland basins, central Japan)

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  • TAKAHATA Moeko
    (株)学研教育出版:東京都板橋区立エコポリスセンター

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Other Title
  • 松本盆地南東部,高ボッチ山西麓に発達する"崖の湯断層群"(<特集>内陸盆地の構造と形成プロセス)
  • 松本盆地南東部,高ボッチ山西麓に発達する"崖の湯断層群"
  • マツモト ボンチ ナントウブ,コウボッチサン セイロク ニ ハッタツ スル"ガケ ノ ユ ダンソウグン"

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Abstract

There are many active faults such as the Gofukuji fault around the Matsumoto Basin which is one of an inland basin along the Itoigawa-Shizuoka Tectonic Line. In this paper, author describe the new finding active faults "Gakenoyu active fault swarm"and discuss its geological meanings. The Gakenoyu active fault swarm, which is trending from NNE-SSW or NE-SW on the western mountain foot of Mt.Takabotti , has a great gauge zone in the Neogene Uchimura Formation and granodioritic intrusive body. A gouge zone is around 2km width and contain 20 or more faults in it. Most of these faults has dextral and vertical slip senses. The Gakenoyu active fault cut clearly Late Pleistocene Kataoka and Akagiyama Gravel Formations. Displacements of the Kataoka Gravel Formation is estimates around 400m vertically. Field occurrences indicate that the Gakenoyu and Gofukuji active fault systems are developed as a conjugate fault set in these area. Many historical documents on the natural disasters of these area indicate that the active of the Gakenoyu fault affects to the natural environments episodically of this area. By field and historic occurrences, it is clear that the Gakenoyu active fault swarm is an new finding active faults which has an important meaning geologically and measures for a natural disaster for these area.

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