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조화룡(W . R . Jo),강전독정(A . Okada),전명순(M . S . Jun),김성작(S . K . Kim),도변만구(M . Watanave),좌등비여지(H . Sato),전정수(J . S . Jeon),지헌철(H . C . Chi),미지화부(K . Oike) 한국지형학회 1994 한국지형학회지 Vol.1 No.2
Many distinct lineaments have been recognized by Landsat images In Korea Peninsula. The Yangsan fault system situated in the southeastern part of Korea is especially linear, continuously traceable for a long distance(about 200㎞), and particularly remarkable among these linearnent. The topographic expression of the Yangsan fault system is derived from the straightly stretching fault valley with wide shattered zones in the direction of NNE-SSW. This fault system extends for about 200㎞ from the mouth of the Nagdong River west of Busan in the south to Yeondong in the north, and geologically separates Korean Peninsula from the East Sea. The amount of horizontal displacement may reach 30㎞. It is recognized as one of the most important faults in Korea Peninsula. From the interpretations of aerial photographs, and field surveys along the central part of the Yangsan fault system, the main results are summarized as follows; 1. The Yangsan fault system has repeatedly moved in the late Quaternary. The lower to higher river terrace surface on this system show cumulative vertical offsets. 2. The vertical component is upthrown on the east side from considering the terrace offset and the distribution of the mountainous lands. This vertical movement is reverse to the topographical situation on the meso-scale. 3. The fault trace is extremely straight. The fault plane is almost vertical. The shattered zone exceeds tens of meters in width with a remarkable fault gouge. 4. The longer axis of flat clasts within the gravel excavated in the exploratory trench showed the rearrangement along the fault. The predominantly right-lateral movements were recognized as the elongation of clayey parts and breccias in the fault gouge. 5. From these characteristics, the Yangsan fault was clarified to be active with predominantly right-lateral movement. Estimated ages of terraces and its deposits give average rates of vertical and right slip on the Yangsan fault system at about 0.02~0.03&/y., respectively. 6. The fault topography is not found on the lower terraces. As the surface of lower fault scarplets less than a few meters high might have been modified or destroyed by the human actions. Therefore, we cannot mention the existence of the younger movement on the lower terraces.
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