On the several shearing evidences developed in the Yangsan Fault, Korea

In large fault zone, various contractional and extensional structures accommodate horizontal shortening and extension in response to differential plate movements related to the Earth’s rotation. In this study, it was conducted a structural analysis of the Yangsan Fault, developed in the southeast Korea. The fault is about 200 Km long in land and has a general NNE-trend, cutting not only the Cretaceous rocks but also the Quaternary layers. We studied several main fault zones along Yangsan Fault. Here, we discuss some kinematic evidences and characteristics developed in the main fault zones of the Yangsan Fault, Korea. In the core of the Yangsan Fault Zone, fault-bounded sheets or blocks are horizontally rotated, duplexed and folded. From the kinematics of the sheet-bounding faults and intra-sheet minor folds, we suggest some evolutionary models of the Yangsan Fault Zone in which repeated fault-related rotation, dragging and folding are occurred.