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<p>Normal faulting in the southern Tibetan rift system reflects ongoing orogenic collapse. Here we use multisensor InSAR (Lutan-1, Sentinel-1 and ALOS-2) to map deformation from the 2025 M<sub>W</sub> 7.0 Dingri earthquake and to invert fault geometry and slip for the main rupture and a geodetically inferred west-side slip episode. The mainshock exhibits bimodal slip on steeply dipping conjugate faults (dip ≥55°). The west-side episode is equivalent to M<sub>W</sub> ~6.0 and involves two oppositely dipping segments, including deeper reactivation of the fault that ruptured in the 2020 M<sub>W</sub> 5.6 Dingri earthquake. Numerical dynamic-rupture simulations indicate that, under the adopted friction and stress conditions, static and dynamic stress perturbations alone are unlikely to generate M<sub>W</sub> ~6 slip on the west-side structure, implying additional weakening or near-critical prestress. Larger fault-bounded volumes host larger slip, highlighting the role of connectivity and mechanical heterogeneity in seismic hazard assessment.</p>

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Bipartite rupture in the 2025 Dingri earthquake indicates normal conjugate faulting during orogenic collapse

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  • 发表日期：

    2026年2月5日

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  • Kefeng He,
  • Jianfeng Cai,
  • Yangmao Wen,
  • Caijun Xu

摘要

Normal faulting in the southern Tibetan rift system reflects ongoing orogenic collapse. Here we use multisensor InSAR (Lutan-1, Sentinel-1 and ALOS-2) to map deformation from the 2025 MW 7.0 Dingri earthquake and to invert fault geometry and slip for the main rupture and a geodetically inferred west-side slip episode. The mainshock exhibits bimodal slip on steeply dipping conjugate faults (dip ≥55°). The west-side episode is equivalent to MW ~6.0 and involves two oppositely dipping segments, including deeper reactivation of the fault that ruptured in the 2020 MW 5.6 Dingri earthquake. Numerical dynamic-rupture simulations indicate that, under the adopted friction and stress conditions, static and dynamic stress perturbations alone are unlikely to generate MW ~6 slip on the west-side structure, implying additional weakening or near-critical prestress. Larger fault-bounded volumes host larger slip, highlighting the role of connectivity and mechanical heterogeneity in seismic hazard assessment.