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<p>On January 7, 2025, a Mw 7.1 earthquake struck Southern Tibet, causing significant damage and loss of life. The earthquake and its aftershocks were widely felt across South Asia. This study investigates the seismotectonic characteristics of the event by analyzing its focal mechanism solution, stress tensor inversion, and Coulomb stress changes. The focal mechanism solution was determined using the ISOLA software with full waveform inversion data from the broadband seismometer in Mizoram, Tripura, India, and Tibet, China. Results indicate a normal faulting mechanism with a NNW-SSE strike. An iterative stress tensor inversion using 52 focal mechanism solutions (Mw &gt; 5) from 1976 to 2025, including the Mw 7.1 mainshock, suggests an E-W extensional and nearly N-S compressional stress regime, confirming the regional tectonic influences. Coulomb stress change analysis indicated a stress perturbation ranging from -5 bars (-0.5&#xa0;MPa) to + 5 bars (+ 0.5&#xa0;MPa). These stress changes align with the aftershock distributions, suggesting a strong influence of stress transfer. This study contributes to a broader understanding of earthquake interactions in the region and seismic hazard assessment.</p>

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Seismotectonic analysis of the January 7, 2025, Mw 7.1 earthquake in Southern Tibet

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Zosangliana Ralte,
  • Santanu Baruah,
  • Kimlina Gogoi,
  • Lalruatpuia Tlau,
  • Saitluanga Sailo,
  • Manoj Kumar Phukan,
  • Sebastiano D’Amico,
  • Sujit Dasgupta,
  • Sowrav Saikia,
  • Sanjeev Kr Bhattacharyya

摘要

On January 7, 2025, a Mw 7.1 earthquake struck Southern Tibet, causing significant damage and loss of life. The earthquake and its aftershocks were widely felt across South Asia. This study investigates the seismotectonic characteristics of the event by analyzing its focal mechanism solution, stress tensor inversion, and Coulomb stress changes. The focal mechanism solution was determined using the ISOLA software with full waveform inversion data from the broadband seismometer in Mizoram, Tripura, India, and Tibet, China. Results indicate a normal faulting mechanism with a NNW-SSE strike. An iterative stress tensor inversion using 52 focal mechanism solutions (Mw > 5) from 1976 to 2025, including the Mw 7.1 mainshock, suggests an E-W extensional and nearly N-S compressional stress regime, confirming the regional tectonic influences. Coulomb stress change analysis indicated a stress perturbation ranging from -5 bars (-0.5 MPa) to + 5 bars (+ 0.5 MPa). These stress changes align with the aftershock distributions, suggesting a strong influence of stress transfer. This study contributes to a broader understanding of earthquake interactions in the region and seismic hazard assessment.