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<p>The Xinbaoan–Shacheng Fault is located in the northeastern Huai-Zhuo Basin, where the eastern Jin–Ji–Meng Plateau tectonic zone intersects the Zhangjiakou–Bohai earthquake belt at the North China Plain. As a major active structure, it shows significant Late Pleistocene (Q<sub>p</sub>3) activity, yet its slip rate and strong-earthquake recurrence behavior remain poorly constrained. In this study, satellite remote-sensing interpretation, paleoseismic trenching, detailed geological–geomorphic mapping, and Late Pleistocene chronological analysis were integrated to reconstruct its deformation features in the late Quaternary. The fault preserves a composite coseismic rupture scarp 32&#xa0;km long, striking NW40°–65° and dipping southwest at ~ 70°, with a height of 1.5–3&#xa0;m, and the statistical magnitude-displacement empirical relationship indicates that it corresponds to a historical earthquake of M 6¾-7. Trench evidence indicates normal-faulting kinematics, with the most recent surface-rupturing event occurring in the late Holocene, plausibly associated with the 1720 <i>M</i>7 Shacheng earthquake. Deformation–age relationships yield a vertical slip rate of 0.06 ± 0.01&#xa0;mm/a (R² = 0.97) and a strong-earthquake recurrence interval of 3.39 ± 0.61&#xa0;ka, characterized by alternating long and short cycles. These results provide robust quantitative constraints on the seismic behavior of the Xinbaoan–Shacheng Fault and offer important implications for regional tectonic evolution and seismic-hazard assessment in the Huai-Zhuo Basin and the whole North China Plain.</p>

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Late Quaternary activities of the Xinbaoan–Shacheng fault in the North China Plain

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月30日

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  • Chunmiao Qiu,
  • Zhongyuan Yu,
  • Luwei Li,
  • Wenxuan Wang,
  • Qian Zhao,
  • Rongying Zheng,
  • Yanlin Yang

摘要

The Xinbaoan–Shacheng Fault is located in the northeastern Huai-Zhuo Basin, where the eastern Jin–Ji–Meng Plateau tectonic zone intersects the Zhangjiakou–Bohai earthquake belt at the North China Plain. As a major active structure, it shows significant Late Pleistocene (Qp3) activity, yet its slip rate and strong-earthquake recurrence behavior remain poorly constrained. In this study, satellite remote-sensing interpretation, paleoseismic trenching, detailed geological–geomorphic mapping, and Late Pleistocene chronological analysis were integrated to reconstruct its deformation features in the late Quaternary. The fault preserves a composite coseismic rupture scarp 32 km long, striking NW40°–65° and dipping southwest at ~ 70°, with a height of 1.5–3 m, and the statistical magnitude-displacement empirical relationship indicates that it corresponds to a historical earthquake of M 6¾-7. Trench evidence indicates normal-faulting kinematics, with the most recent surface-rupturing event occurring in the late Holocene, plausibly associated with the 1720 M7 Shacheng earthquake. Deformation–age relationships yield a vertical slip rate of 0.06 ± 0.01 mm/a (R² = 0.97) and a strong-earthquake recurrence interval of 3.39 ± 0.61 ka, characterized by alternating long and short cycles. These results provide robust quantitative constraints on the seismic behavior of the Xinbaoan–Shacheng Fault and offer important implications for regional tectonic evolution and seismic-hazard assessment in the Huai-Zhuo Basin and the whole North China Plain.