Scholarlink

<p>The March 28, 2025 Myanmar earthquake generated ground shaking that was perceptible throughout Myanmar and adjacent regions. This study simulated three-component ground motions across the affected region using an improved stochastic finite-fault method to systematically assess seismic impacts. Observed near-field recordings at MM.NGU station was used to determine the reliability of the theoretically derived stress drop as input for simulation. Far-field recordings constrained the frequency-dependent S-wave quality factors (<i>Q</i>(<i>f</i>) = 283.305<i>f</i><sup>0.588</sup>) for anelastic attenuation modeling. Comparisons of peak accelerations between simulation and empirical ground-motion models showed good agreement at moderate-to-large distances. However, lower near-fault simulations indicate a weaker-than-average source effect. Analysis of simulated instrumental seismic intensity revealed key patterns. Maximum intensity (X) occurred in isolated patches within the ruptured fault projection, correlating with shallow high-slip areas. The IX-intensity zone formed a north-south elongated band centered on fault projection. Significant asymmetry in VIII-intensity distribution perpendicular to the fault strike was observed, with a wider western extension attributed to lower shear-wave velocities west of the fault. Supershear rupture behavior enhanced ground motions, expanding intensity ranges by ∼20% compared to sub-shear rupture. This study reveals the integrated effects of fault geometry, slip spatial distribution, rupture velocity, and site condition in governing ground motion patterns.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Integrated source-site effects on seismic intensity in the 2025 Myanmar earthquake from the three-component ground motion simulations by stochastic finite-fault method

  • 期刊论文

  • 发表日期：

    2025年8月16日

查看全文
  • Hongwei Wang,
  • Ruizhi Wen,
  • Zhong Peng,
  • Yefei Ren,
  • Shengyin Qiang,
  • Ye Liu

摘要

The March 28, 2025 Myanmar earthquake generated ground shaking that was perceptible throughout Myanmar and adjacent regions. This study simulated three-component ground motions across the affected region using an improved stochastic finite-fault method to systematically assess seismic impacts. Observed near-field recordings at MM.NGU station was used to determine the reliability of the theoretically derived stress drop as input for simulation. Far-field recordings constrained the frequency-dependent S-wave quality factors (Q(f) = 283.305f0.588) for anelastic attenuation modeling. Comparisons of peak accelerations between simulation and empirical ground-motion models showed good agreement at moderate-to-large distances. However, lower near-fault simulations indicate a weaker-than-average source effect. Analysis of simulated instrumental seismic intensity revealed key patterns. Maximum intensity (X) occurred in isolated patches within the ruptured fault projection, correlating with shallow high-slip areas. The IX-intensity zone formed a north-south elongated band centered on fault projection. Significant asymmetry in VIII-intensity distribution perpendicular to the fault strike was observed, with a wider western extension attributed to lower shear-wave velocities west of the fault. Supershear rupture behavior enhanced ground motions, expanding intensity ranges by ∼20% compared to sub-shear rupture. This study reveals the integrated effects of fault geometry, slip spatial distribution, rupture velocity, and site condition in governing ground motion patterns.