活断層研究
Online ISSN : 2186-5337
Print ISSN : 0918-1024
ISSN-L : 0918-1024
写真測量技術を導入した糸魚川-静岡構造線断層帯北部(栂池-木崎湖)の詳細変位地形・鉛直平均変位速度解析
松多 信尚澤 祥安藤 俊人廣内 大助田力 正好谷口 薫佐藤 善輝石黒 聡士内田 主税佐野 滋樹野澤 竜二郎坂上 寛之隈元 崇渡辺 満久鈴木 康弘
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2006 年 2006 巻 26 号 p. 105-120

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The Itoigawa-Shizuoka tectonic line (ISTL) is one of the major tectonic lines in Honshu Island, Japan, and its northern and central part forms an active fault system. As the slip-rates of active faults provide the basic information for understanding quantitative active tectonics, we estimated the slip-rates along the northern part of ISTL active fault system by tectonic geomorphological study and the aerial photogrammetric survey. We took large-scale air photographs along ISTL. When tectonic landforms were artificially modified, we measured terrace offsets using old air photographs. We described the geomorphological interpretation of deformed landforms in this paper and precisely mapped fault traces. As a result, vertical slip rates of the ISTL active fault system in this area except the northern edge have no significant changes. In the northern edge, the vertical slip rate of the east dipping fault is on the decrease, and that of the west dipping fault is on the increase. Consequently, we inferred that the west-dipping fault began activation instead of the east dipping fault.

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