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<p>The 2024 M<sub>w</sub> 7.0 Wushi earthquake is the largest earthquake within the seismically active Tian Shan during the past three decades. Through integrated analyses of seismic, geodetic, and geologic data, here we investigate the fault structure corresponding to the Wushi mainshock and subsequent aftershocks. Our work reveals (i) a moderately-dipping, oblique-reverse main-fault rupture and (ii) numerous steeply to vertically-dipping subfault ruptures that align obliquely in cross-section to the main fault. The subfaults made clear aftershock concentrations while the main fault did not, and a shallowly-buried subfault generated clear surface rupture despite the main fault being totally blind. This fault network, misoriented with the prevailing background stress field, likely forms through a reactivation of inherited planes of weakness. These results demonstrate the significant control of structural inheritance on fault geometric architecture and highlight the complexity of seismic activity and rupture behavior of the yielding fault network.</p>

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Interlacing ruptures of the 2024 Wushi earthquake (Chinese Tian Shan) controlled by structural inheritance

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月17日

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  • Xinzhong Yin,
  • Tao Li,
  • Yingfeng Zhang,
  • Zhigang Peng,
  • Luca Dal Zilio,
  • Zhuxin Chen,
  • Huawei Cui,
  • Li Qian,
  • Xiao Sun,
  • Renqi Lu,
  • Biao Guo,
  • Wenxin Yang,
  • Jiuhui Chen,
  • Jie Chen

摘要

The 2024 Mw 7.0 Wushi earthquake is the largest earthquake within the seismically active Tian Shan during the past three decades. Through integrated analyses of seismic, geodetic, and geologic data, here we investigate the fault structure corresponding to the Wushi mainshock and subsequent aftershocks. Our work reveals (i) a moderately-dipping, oblique-reverse main-fault rupture and (ii) numerous steeply to vertically-dipping subfault ruptures that align obliquely in cross-section to the main fault. The subfaults made clear aftershock concentrations while the main fault did not, and a shallowly-buried subfault generated clear surface rupture despite the main fault being totally blind. This fault network, misoriented with the prevailing background stress field, likely forms through a reactivation of inherited planes of weakness. These results demonstrate the significant control of structural inheritance on fault geometric architecture and highlight the complexity of seismic activity and rupture behavior of the yielding fault network.