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Application of electrical resistivity surveys to detect buried active fault: a case study of the southern Yangsan Fault, Korea

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Abstract

The main goal of active fault investigation is obtaining evidence of the Quaternary fault activity through trenching. To accomplish this, electrical resistivity surveys are widely utilized to accurately detect faults buried beneath alluvium. In this study, 2D and 3D electrical resistivity surveys were conducted at the Miho site of the southern Yangsan Fault, the Quaternary active fault area already well-studied via trench investigations. The efficacy of electrical resistivity surveys for fault detection was examined by comparing the resistivity distributions against data in the trench logs. At the Miho site, three lines were installed for the 2D electrical resistivity survey and 22 lines were set within a 27 × 27 m square area for the 3D electrical resistivity survey. The length of each survey line was 27 m with an electrode spacing of 1 m. A dipole-dipole array was used to measure the potential difference between each measurement electrode using the same transmitted current and voltage. To derive the 2D and 3D resistivity distributions from the data acquired in the field, the inversion programs DC_2DPRO and DC_3DPRO were employed. Comparison of the 2D resistivity distribution with trench log data shows that the zone of dacitic welded tuff west of the Quaternary fault plane has relatively high resistivity, while the zone of foliate gouge and breccia derived from sedimentary rocks east of the Quaternary fault plane has a low resistivity of less than 40 Ω·m. From these results, it is evident that the method is effective, particularly when different rock types are distributed on either side of the fault boundary or when highly conductive materials, such as clay-rich fault gouges, are present within the fault zone. The resistivity distribution in the 3D survey area can be depicted using both block diagrams and depth-specific slices, facilitating a spatial understanding of the continuity of fault (or fracture) zones. Consequently, this study demonstrates that 3D surveys offer numerous advantages over 2D surveys by accurately capturing planar structures and enabling spatial interpretation based on 3D resistivity distribution.

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Acknowledgments

This study was supported by grants from the Basic Research Projects (GP2020-014 and GP2020-007) of KIGAM, funded by the Korean Ministry of Science and ICT. We appreciate the constructive discussion provided by Dr. Jin-Hyuck Choi. We also gratefully thank Prof. Panos Tsourlos and an anonymous reviewer for very valuable comments, and Prof. Jeong-Sik Oh for editorial guidance.

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Authors and Affiliations

  1. Mineral Exploration and Mining Research Center, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, Republic of Korea

    Samgyu Park & Myeong-Jong Yi

  2. Active Tectonics Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahak-ro, Yuseong-gu, Daejeon, 34132, Republic of Korea

    Youngbeom Cheon & Changwan Sun

  3. Geological Science, KIGAM School, University of Science and Technology, Daejeon, 34113, Republic of Korea

    Changwan Sun

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  1. Samgyu Park
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Park, S., Cheon, Y., Yi, MJ. et al. Application of electrical resistivity surveys to detect buried active fault: a case study of the southern Yangsan Fault, Korea. Geosci J (2024). https://doi.org/10.1007/s12303-024-0010-8

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