Structures in Offshore Hsinchu Area

• Main Authors: Wen-Shao Shen, 沈玟劭
• Other Authors: Char-Shine Liu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/93268697325721382111

碩士 === 國立臺灣大學 === 海洋研究所 === 96 === 　　Hsinchu area in Northwestern Taiwan is located on the northern edge of the active collision-deformation belt, close to the transition zone between the collision environment to the east and the extension environment to the west. Different from the studies of CPC in the Hsinchu-Miaoli area which focus on deep structures, this study analyses the structures above 2 seconds of two-way travel time on seismic sections for the purpose of identifying recent fault activities. 　　Through the seismic profiles and comparing with adjacent ones, we identified structural features in offshore Hsinchu area. The fold and fault structures in the northern study area could be connected with on land structures, such as the Hukou fault and the Hsinchu fault, which became strike-slip faults offshore. In the southern study area, the faults are less likely to have connection with on land structures. Based on the locations where aggradation ceased and the change of fault types from thrust to normal faults, we delineate the location of the deformation front in the offshore area between the Peikang Basement High and Guanyin Basement High. 　　At shallow depths offshore southern Hsinchu, there are faults almost outcrop to the seafloor, while in the southern part of the study area normal faults appeared at some depths. This study reveals that the northern study area is tectonicly more active then the southern part of the study area, and the area of basement high is stable that faulting activities do not usually occur.