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Deformation history and characteristics of the Ilgwang Fault in Southeast Korea

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Abstract

The NNE-SSW trending Ilgwang Fault is one of the major structural features in Southeast Korea. It is a high angle, right-lateral strike-slip fault with a displacement of about 1.2 km. The basement around the fault consists of Cretaceous sedimentary and volcanic rocks with younger igneous intrusions, forms part of the Gyeongsang Basin. The fault has not been studied thoroughly due to poor exposures along the fault; however, it is important to understand the characteristics of the Ilgwang Fault, as it is located near nuclear facilities and large cities with tall buildings. In this study, we investigated exposures in new road-cut sections along the Busan–Ulsan Highway. The structural patterns analyzed show wide deformation zones and may indicate various multi-deformation events including reactivation of pre-existing faults. Based on kinematic analysis of faults, joints, and dykes, the deformation history of the study area includes the following phenomena: 1) E-W trend reverse faulting with the intrusion of N-S trending acidic dykes; 2) NNE-SSW trend reverse faulting and folding; 3) ENE-WSW trend left-lateral faulting and NNESSW trend right-lateral faulting with the intrusion of NE-SW trending intermediate dykes; 4) E-W trend normal faulting; 5) N-S or NNE-SSW trend reverse faulting; and 6) NNW-SSE trend reverse faulting and reactivation of pre-existing normal faults. The angular change of the structural elements (e.g., beddings) is used here as an indicator of deformation intensity across the fault. The analysis shows that the deformation zone across the Ilgwang Fault spans about 200 m in volcanic rocks and 1 km in sedimentary rocks, indicating that the deformation is strongly localized in volcanic rocks and more diffused in sedimentary rocks. Numerical modeling supports the conclusion that sedimentary substrate has a wider deformation zone than do massive granitic or volcanic rocks, suggesting that material properties are one of the main factors controlling concentration of stress and possible resultant damage.

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Authors and Affiliations

  1. Climate Change Mitigation & Sustainability Division, Korea Institute of Geosciences and Mineral Resources, Daejeon, 34132, Republic of Korea

    Kwangmin Jin

  2. Department of Earth & Environmental Sciences, Pukyong National University, Busan, 48513, Republic of Korea

    Young-Seog Kim

  3. Mineral Resources Division, Korea Institute of Geosciences and Mineral Resources, Daejeon, 34132, Republic of Korea

    Seok-Jun Yang

  4. Geology Division, Korea Institute of Geosciences and Mineral Resources, Daejeon, 34132, Republic of Korea

    Jin-Hyuck Choi

  5. Petroleum & Marine Division, Korea Institute of Geosciences and Mineral Resources, Daejeon, 34132, Republic of Korea

    Kyong-O Kim

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Jin, K., Kim, YS., Yang, SJ. et al. Deformation history and characteristics of the Ilgwang Fault in Southeast Korea. Geosci J 22, 209–226 (2018). https://doi.org/10.1007/s12303-017-0037-1

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