지형지시자와 현생 응력장을 고려한 활성 가능 선형구조의 판별

초록

In intraplate regions, geomorphic deformation associated with fault activity is often subtle, making it difficult to distinguish tectonically related structures from numerous surface lineaments. This study aims to identify potentially active lineaments by integrating lineament analysis, fault-related geo morphic markers, and current stress-field constraints in the Okcheon–Boeun–Yeongdong area of Chungcheongbuk-do, Korea. Lineaments were extracted using DEM-based topographic analysis, and their associated fault types were interpreted based on the distribution of geomorphic markers. These interpretations were then re-evaluated in terms of their geometric compatibility with the current stress-field. In addition, electrical resistivity tomography (ERT) was conducted to investigate shallow sub surface structures. A total of 211 lineaments were identified within the study area (~1,967 ㎢), of which three were selected as potentially active lineaments that satisfy both geomorphic and stress-field criteria. Low-resistivity anomalies detected along these lineaments suggest the presence of shallow subsurface structures associated with fault damage zones. This study proposes a stepwise framework that integrates geomorphic and tectonic constraints for identifying potentially active lineaments, providing an effective approach for prioritizing targets for active fault investigations in broad regions.

키워드