A Study on the Lineament Analysis Along Southwestern Boundary of Okcheon Zone Using the Remote Sensing and DEM Data

원격탐사자료와 수치표고모형을 이용한 옥천대 남서경계부의 선구조 분석 연구

  • Kim, Won Kyun (Department of Earth System Sciences, Yonsei University) ;
  • Lee, Youn Soo (Department of Earth System Sciences, Yonsei University) ;
  • Won, Joong-Sun (Department of Earth System Sciences, Yonsei University) ;
  • Min, Kyung Duck (Department of Earth System Sciences, Yonsei University) ;
  • Lee, Younghoon (Department of Earth System Sciences, Yonsei University)
  • 김원균 (연세대학교 지구시스템과학과) ;
  • 이윤수 (연세대학교 지구시스템과학과) ;
  • 원중선 (연세대학교 지구시스템과학과) ;
  • 민경덕 (연세대학교 지구시스템과학과) ;
  • 이영훈 (연세대학교 지구시스템과학과)
  • Received : 1997.09.25
  • Published : 1997.10.31


In order to examine the primary trends and characteristics of geological lineaments along the southwestern boundary of Okcheon zone, we carried out the analysis of geological lineament trends over six selected sub-areas using Landsat-5 TM images and digital elevation model. The trends of lineaments is determined by a minimum variance method, and the resulting geological lineament map can be obtained through generalized Hough transform. We have corrected look direction biases reduces the interpretability of remotely sensed image. An approach of histogram modification is also adopted to extract drainage pattern specifically in alluvial plains. The lineament extracting method adopted in this study is very effective to analyze geological lineaments, and that helps estimate geological trends associated various with the tectonic events. In six sub-areas, the general trends of lineaments are characterized NW, NNW, NS-NNE, and NE directions. NW trends in Cretaceous volcanic rocks and Jurassic granite areas may represent tension joints that developed by rejuvenated end of the Early Cretaceous left-lateral strike-slip motion along the Honam Shear Zone, while NE and NS-NNE trends correspond to fault directions which are parallel to the above Shear Zone. NE and NW trends in Granitic Gneiss are parallel to the direction of schitosity, and NS-NNE and NE trends are interpreted the lineation by compressive force which acted by right-lateral strike-slip fault from late Triassic to Jurassic. And in foliated Granite, NE and NNE trends are coincided with directions of ductile foliation and Honam Shear Zone, and NW-NNW trends may be interpreted direction of another compressional foliation (Triassic to Early Jurassic) or end of the Early Cretaceous tensional joints. We interpreted NS-NNE direction lineation is related with the rejuvenated Chugaryung Fault System.



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