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<p>The 2025 moment magnitude (<i>M</i><sub><i>w</i></sub>) 7.1 Dingri earthquake in Southern Xizang, China, caused severe devastation and exhibited a complex stress evolution. Its northward unilateral rupture along the twisted, west-dipping graben edge generated ~2 MPa of dynamic stress, triggering blind coseismic slip on an east-dipping fault. Coseismic stress perturbations activated over 50 previously unmapped fault segments, mostly with aseismic slip, while also inducing an early viscoelastic response in the weak middle-to-lower crustal layer below ~20 km depth. Here we explain these behaviours by deciphering the stress perturbations through earthquake cycle observations and models. A major implication is that tracking stress evolution throughout an earthquake provides critical insights into earthquake mechanics.</p>

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Deciphering stress perturbations throughout the 2025 Mw 7.1 Dingri, Southern Xizang Earthquake

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月16日

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  • Zhangfeng Ma,
  • Chenglong Li,
  • Hongyu Zeng,
  • Han Chen,
  • Mingzhe Lyu,
  • Yingfeng Zhang,
  • Luca Dal Zilio,
  • Xinjian Shan,
  • Shengji Wei

摘要

The 2025 moment magnitude (Mw) 7.1 Dingri earthquake in Southern Xizang, China, caused severe devastation and exhibited a complex stress evolution. Its northward unilateral rupture along the twisted, west-dipping graben edge generated ~2 MPa of dynamic stress, triggering blind coseismic slip on an east-dipping fault. Coseismic stress perturbations activated over 50 previously unmapped fault segments, mostly with aseismic slip, while also inducing an early viscoelastic response in the weak middle-to-lower crustal layer below ~20 km depth. Here we explain these behaviours by deciphering the stress perturbations through earthquake cycle observations and models. A major implication is that tracking stress evolution throughout an earthquake provides critical insights into earthquake mechanics.