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<p>Dispatched by the Chinese government, a multidisciplinary team of 30 researchers collaborated with a team from Myanmar to conduct a 14-day on-site investigation. The work encompassed seismic intensity assessments, field surveys, and loss evaluations. The paper focuses on the intensity distribution and structural damage characteristics of the 2025 <i>M</i>7.9 Myanmar earthquake, yielding the following key findings. (1) The seismogenic fault rupture propagated in a nearly N-S direction, with a surface rupture length of approximately 450 km. The seismic impact zone exhibited an elongated N-S distribution and a shorter E-W span, distributed like a belt around the seismogenic fault. (2) Within the seismic impact zones, existing buildings comprised five primary structural types, with timber (bamboo) structures constituting the largest proportion (≈80% in rural areas, ≈50% in urban areas). The relatively low disaster losses and casualties were primarily attributable to the good seismic performance and low damage ratio of timber (bamboo) structures across varying intensity zones. (3) An anomalous zone of intensity IX was located at the boundary between intensity VI and VII regions in Nay Pyi Taw. Here, ridge topography combined with soft soil layers significantly amplified ground motion, exacerbating structural damage. (4) Directional effects of ground motion were observed, with the structural damage phenomena and peak ground acceleration (PGA) values in the N-S direction exceeding those in the E-W direction. This validates that the maximum PGA distribution of strike-slip fault earthquakes aligns with the fault strike. The research is expected to provide technical support for post-disaster reconstruction planning, site selection, and disaster mitigation strategies in Myanmar.</p>

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Assessment of seismic intensity and seismic performance of buildings in the M7.9 Myanmar earthquake

  • 期刊论文

  • 发表日期：

    2025年7月5日

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  • Baitao Sun,
  • Jiaqi Yan,
  • Yongqiang Yang,
  • Xiangzhao Chen,
  • Menghan Sun

摘要

Dispatched by the Chinese government, a multidisciplinary team of 30 researchers collaborated with a team from Myanmar to conduct a 14-day on-site investigation. The work encompassed seismic intensity assessments, field surveys, and loss evaluations. The paper focuses on the intensity distribution and structural damage characteristics of the 2025 M7.9 Myanmar earthquake, yielding the following key findings. (1) The seismogenic fault rupture propagated in a nearly N-S direction, with a surface rupture length of approximately 450 km. The seismic impact zone exhibited an elongated N-S distribution and a shorter E-W span, distributed like a belt around the seismogenic fault. (2) Within the seismic impact zones, existing buildings comprised five primary structural types, with timber (bamboo) structures constituting the largest proportion (≈80% in rural areas, ≈50% in urban areas). The relatively low disaster losses and casualties were primarily attributable to the good seismic performance and low damage ratio of timber (bamboo) structures across varying intensity zones. (3) An anomalous zone of intensity IX was located at the boundary between intensity VI and VII regions in Nay Pyi Taw. Here, ridge topography combined with soft soil layers significantly amplified ground motion, exacerbating structural damage. (4) Directional effects of ground motion were observed, with the structural damage phenomena and peak ground acceleration (PGA) values in the N-S direction exceeding those in the E-W direction. This validates that the maximum PGA distribution of strike-slip fault earthquakes aligns with the fault strike. The research is expected to provide technical support for post-disaster reconstruction planning, site selection, and disaster mitigation strategies in Myanmar.