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<p>The 2025 <i>M</i><sub>w</sub> 7.7 Myanmar earthquake highlighted the challenge of near-fault seismic intensity field reconstruction due to sparse seismic networks. To address this limitation, a framework was proposed integrating seismic wave simulation with a data-constrained finite-fault rupture model. The constraint is implemented by identifying the optimal ground motion models (GMMs) through a scoring system that selects the best-fit GMMs to mid- and far-field China Earthquake Networks Center (CENC) seismic network data; and applying the optimal GMMs to refine the rupture model parameters for near-fault intensity field simulation. The simulated near-fault seismic intensity field reproduces seismic intensities collected from Myanmar’s sparse seismic network and concentrated in ≥VIII intensity zones within 50 km of the projected fault plane; and identifies abnormal intensity regions exhibiting ≥X intensity along the Meiktila-Naypyidaw corridor and near Shwebo that are attributed to soft soil amplification effects and near-fault directivity. This framework can also be applied to post-earthquake assessments in other similar regions.</p>

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Seismic wave simulation of near-fault seismic intensity field for the 2025 Myanmar Mw 7.7 earthquake constrained by mid- to far-field CENC seismic network data

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Zhinan Xie,
  • Shuai Wang,
  • Yangtao Yuan,
  • Wenyue Zhang,
  • Tianyu Zhou,
  • Qiang Ma,
  • Shanyou Li

摘要

The 2025 Mw 7.7 Myanmar earthquake highlighted the challenge of near-fault seismic intensity field reconstruction due to sparse seismic networks. To address this limitation, a framework was proposed integrating seismic wave simulation with a data-constrained finite-fault rupture model. The constraint is implemented by identifying the optimal ground motion models (GMMs) through a scoring system that selects the best-fit GMMs to mid- and far-field China Earthquake Networks Center (CENC) seismic network data; and applying the optimal GMMs to refine the rupture model parameters for near-fault intensity field simulation. The simulated near-fault seismic intensity field reproduces seismic intensities collected from Myanmar’s sparse seismic network and concentrated in ≥VIII intensity zones within 50 km of the projected fault plane; and identifies abnormal intensity regions exhibiting ≥X intensity along the Meiktila-Naypyidaw corridor and near Shwebo that are attributed to soft soil amplification effects and near-fault directivity. This framework can also be applied to post-earthquake assessments in other similar regions.