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<p>Active faults are one of the main causes of moderate or larger earthquakes with shallow hypocenters and multidisciplinary field surveys to define these fault systems are crucial in mitigating earthquake hazards. There have recently been collective efforts to trace paleoseismic activities that caused surface ruptures during the Quaternary Period in South Korea. In this study, we used OhmMapper, a capacitively-coupled resistivity (CCR) meter, to conduct electrical resistivity surveys at a suburban town in southeastern Korea, where the 200&#xa0;km long Yangsan Fault (YF) system is located. The 2D subsurface resistivity tomography sections were assessed to trace any buried faults beneath the study area. We found a 1.5&#xa0;km long northward extension of the YF system with a 0.9&#xa0;km long branch fault, which has merged in the northern part of the study area. These lineaments have been imaged over the neighboring survey lines and were enclosed by the approximately 400&#xa0;m wide faulted zone with low resistivity distribution. Given the borehole data and trench survey results obtained in the vicinity of the study area, this study shows that the buried faults constitute a Quaternary fault system exhibiting a wide zone damaged by secondary faults. Our results further highlight that near-surface ERT can be effective in tracing buried faults in urban environments.</p>

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Imaging Quaternary paleoseismic rupture zones using electrical resistivity tomography (ERT) in the northern Yangsan Fault segments on the Korean Peninsula

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Eungsang Lee,
  • Jeong-Ryul Choi,
  • Seung-Sep Kim

摘要

Active faults are one of the main causes of moderate or larger earthquakes with shallow hypocenters and multidisciplinary field surveys to define these fault systems are crucial in mitigating earthquake hazards. There have recently been collective efforts to trace paleoseismic activities that caused surface ruptures during the Quaternary Period in South Korea. In this study, we used OhmMapper, a capacitively-coupled resistivity (CCR) meter, to conduct electrical resistivity surveys at a suburban town in southeastern Korea, where the 200 km long Yangsan Fault (YF) system is located. The 2D subsurface resistivity tomography sections were assessed to trace any buried faults beneath the study area. We found a 1.5 km long northward extension of the YF system with a 0.9 km long branch fault, which has merged in the northern part of the study area. These lineaments have been imaged over the neighboring survey lines and were enclosed by the approximately 400 m wide faulted zone with low resistivity distribution. Given the borehole data and trench survey results obtained in the vicinity of the study area, this study shows that the buried faults constitute a Quaternary fault system exhibiting a wide zone damaged by secondary faults. Our results further highlight that near-surface ERT can be effective in tracing buried faults in urban environments.