九芎坑断层的断层特性与活动性研究 - National Taiwan University.PDF

經濟部中央地質調查所特刊 第十四號 ，第123-139 頁，民國九十二年十一月 九芎坑斷層的斷層特性與活動性研究 Structural Characteristics of the Chiuchiungkeng Fault 1 1 2 1 1 1 陳文山 、楊志成、石瑞銓、楊小青、顏一勤、陳于高、 3 3 3 3 3 張徽正 、林偉雄、李元希、石同生、盧詩丁 1 1 2 1 Wen-Shan Chen , Chi-Cheng Yang , Ruey-Chyuan Shih , Hsiao-Chin Yang , 1 1 3 3 Yi-Ching Yan , Yue-Gau Chen , Hui-Cheng Chang , Wei-Hsiung Lin , 3 3 3 Yuan-Hsi Lee , Tung-Sheng Shih , Shih-Ting Lu ABSTRACT The Chiuchiungkeng fault produced a sinuous trace of 17 km in length that followed the boundary between the Western Foothills and the lower hills. The Plio-Pleistocene strata on the hanging wall override the late Pleistocene alluvium and Holocene terraces in the footwall. Based on the measurements of the rupture and seismic reflection, the fault plane angle revealed to determinate the shape of a ramp structure, about 20-30o east-dipping beneath the foothills. Thus, the rapidly uplifting of the foothills makes river incision and uplift on the upthrow block. The neotectono-geomorphologic features reveal to the foothills where display several alluvial and colluvial terraces preservation. 前言 從台灣西南部地區的沉積盆地演化來看，晚更新世之後隆起形成外麓山帶， 其西側丘陵更是在晚晚更新世－全新世才形成，顯然此區域都屬第四紀的活動構 造（陳文山等，2003）。前人研究亦已顯示麓山帶地區存在許多晚第四紀以來的 活動構造（Bonilla, 1975; Hsu and Chang, 1979）。另外，由全新世階地與大地測 台灣大學地質科學系 1. (Dept. of Geosciences, National Taiwan University) 2.中正大學地球與環境科學系(Dept. of Earth and Environ. Science, National Chung Cheng Univ.) 3.經濟部中央地質調查所(Central Geological Survey