2006-01-012024-05-13https://scholars.lib.ntu.edu.tw/handle/123456789/642992摘要：台灣島受到菲律賓海板塊與歐亞大陸的碰撞形成的造山帶，因此遭受強烈的擠壓作用之下，產生許多東北走向的逆斷層與東西走向的平移斷層以及伴隨褶皺構造。構造活動同時引發許多大大小小的地震，但大地震發生同時經常伴隨著地表破裂，過去百年來台灣島就有數次的大地震，並造成地表的斷層破裂，如1906年嘉義大地震產生的梅山斷層、1935年中部大地震的屯子腳斷層、獅潭斷層與神卓山斷層，1946年新化地震的新化斷層，1951年花東大地震的米崙斷層、玉里斷層與池上斷層，以及1999年集集地震的石岡斷層、車籠埔斷層與大尖山斷層。數百萬年以來台灣島就在無數次的地殼變動下持續的擴張與升高。從近百年來規模大於7.0的地震共有7次，就可以了解台灣是世界上地震最為活躍地區之一。另外現今台灣的人口密度約650人/平方公里，大地震發生時造成的傷亡與災害，是世界上可能造成地震災害最為嚴重區域之一。近年來台灣經濟急速發展，大規模開發土地，迫使居住空間逐漸擴及活動斷層沿線，未來的地震造成的傷亡與經濟的損失可能較以往更為嚴重。因此「活動斷層位置的精查」、「斷層活動性研究」以及「地震災害研究」等工作更是迫在眉睫。雖然目前針對地震的<br> Abstract: The subduction of the Eurasian continent beneath the Philippine Sea plate is represented by the westernmost thrust of the Changhua fault in the Western Foothills. The Western Foothills consist of a series of subparallel thrust faults and related folds which form a west-verging fold-thrust belt. Fault-bend and fault-propagation fold structures are also common in the Western Foothills. The thrust system in northern Taiwan is now inactive with normal-faults commonly reactivating former reverse faults throughout the late Quaternary. The Western Foothills and Longitudinal Valley are a strongly active tectonic area. The most conspicuous tectonic features in those areas are north-trending thrust faults. This study will be focued on several active faults in the northern and eastern Taiwan, such as the Lichi fault, Luyeh fault, Sanyi fault, Tiehchanshan fault, Tachia fault, Chingshui fault, Liuchia fault, Hsiaokangshan fault and Chaochou fault. Recent uplift of these thrust sheets results in river incision and development of complex fluvial terraces. Several lateritic and non-lateritic terraces, for example, are preserved along the Beinandachi, Tsengwenchi and Tachia Rivers. Analysis of nearby fluvial systems provides a proxy for thrust deformation because localized long-term uplift produces anomalous changes in river systems. The purpose of this project is to discuss how fault activity can be used to show the tectonic implications. In this study, we focus on the spatial variation of slip rate and activity based on the trenching study along the activity fault. We identify the surface rupture deformation and propose possible tectonic interpretations. In addition, we will reconstruct the characteristics of the river terrace in the eastern and western Taiwan.三義斷層大甲斷層鐵砧山斷層鹿野斷層利吉斷層清水斷層六甲斷層小崗山斷層潮州斷層active faultactivitypaleosiemicityLichi faultLuyeh fault,Sanyi faultTiehchanshan fault,Tachia faultChingshui faultLiuchia faultHsiaokangshan faultChaochou fault