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Fault reactivation with rapid slip along subsidiary faults in the Yangsan Fault zone, SE Korea

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Abstract

Earthquake fault slip accompanied by surface ruptures may occur not only along main fault cores but also along subsidiary faults in damage zones of major (or mature) faults. Nevertheless, most previous studies of fault and earthquake geology have focused on geological observations of main core zones rather than subsidiary faults. We conducted microstructural and mineralogical analyses of fault rock materials from two subsidiary faults (F1 and F2) of the NNE-SSW-striking Yangsan Fault, which is a major strike-slip fault in southeastern Korea (F1 at Pohang Bogyeongsa and F2 at Ulsan Eonyang-Bangok), to understand their possible slip zone processes and slip behaviors. The fault cores of the subsidiary faults are up to 20 cm thick and are composed of clay-rich gouge bands measuring a few millimeters in thickness and enclosed fractured lenses. Microscopic observations reveal that linear, and narrow micro-scale principal slip zones (micro-PSZs; < 20 µm thick), which are characterized by strong preferred orientation of clay minerals, occur not only at the boundaries between the gouge band and adjacent fault rocks but also in the central part of the gouge band. Along the micro-PSZs, microstructures such as clasts truncated by rapid slip localization and gouge injections by thermal pressurization of wet gouge materials during rapid slip are observed. Thus, the structures together may indicate the occurrence of seismic slip on the subsidiary faults. Mineralogical analyses reveal that the total clay fractions (consisting mainly of illite, chlorite, and kaolin) of the gouge materials of F1 and F2 are 60.1 and 59.7 wt%, respectively. The gouge band of F2 is enriched with kaolin (59.7 wt%), which is regarded as a gouge material that can trigger dynamic weakening by dehydration-induced thermal pressurization during seismic slip. Therefore, these results imply that the kaolin-rich gouge band in F2 may be dynamically weakened when seismic reactivation occurs along F2. This study shows that a comprehensive investigation of slip behaviors of subsidiary faults as well as main fault cores is necessary to improve our understanding of the seismic faulting mechanisms of major tectonic fault zones.

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Acknowledgments

We thank three anonymous reviewers for their comments that improved the clarity of the manuscript. We also thank Sangwoo Woo for insightful discussions of the preliminary results of this study. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1A2C1008082) and the Basic Research Project of the Korea Institute of Geoscience and Mineral Resources (KIGAM) funded by the Korean Ministry of Science and ICT (GP2020-014).

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Authors and Affiliations

  1. Geology Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, Republic of Korea

    Chang-Min Kim & Youngbeom Cheon

  2. Department of Geology and Research Institute of Natural Science, Gyeongsang National University, Jinju, 52828, Republic of Korea

    Chang-Min Kim & Raehee Han

  3. Department of Earth and Environmental Sciences, Andong National University, Andong, 36729, Republic of Korea

    Gi Young Jeong

  4. Center for Research Facilities, Gyeongsang National University, Jinju, 52828, Republic of Korea

    Jong Ok Jeong

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  1. Chang-Min Kim
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Kim, CM., Cheon, Y., Han, R. et al. Fault reactivation with rapid slip along subsidiary faults in the Yangsan Fault zone, SE Korea. Geosci J 26, 167–181 (2022). https://doi.org/10.1007/s12303-021-0027-1

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