| 钟菊芳,胡祎石,张艳红,胡晓.基于运动学震源的察隅Mw8.6级地震动模拟[J].水利学报,2024,55(11):1319-1332 |
| 基于运动学震源的察隅Mw8.6级地震动模拟 |
| Simulation of Chayu Mw8.6 ground motion based on kinematic source |
| 投稿时间：2023-12-12 |
| DOI：10.13243/j.cnki.slxb.20230774 |
| 中文关键词: 察隅地震 谱元法 单双断层震源 地震动模拟 近断层效应 衰减效应 |
| 英文关键词: Chayu earthquake spectral element method single and double fault source simulated ground motion near-fault effect attenuation effect |
| 基金项目:水利部重大科技项目(SKS-2022100);中国水利水电科学研究院科研专项项目(EB110145B0012021);国家自然科学基金项目(51969019，51468045);江西省研究生创新专项基金项目(YC2022-s756) |
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| 中文摘要: |
| 为获取1950年察隅Mw8.6级地震的地震动空间分布规律，探讨震源模型对模拟地震动影响以及地震对雅鲁藏布江下游区的影响，在前人研究基础上分别建立单断层和双断层运动学混合震源模型，综合考虑中国大陆岩石圈速度结构模型USTClitho1.0和全球地壳模型Crust1.0，分别构建单断层模型场地和双断层模型场地对应的地下一维速度结构，采用谱元法对察隅Mw8.6地震开展了目标区域地震动合成研究。通过对比分析目标区域4个观测点的模拟加速度时程、反应谱与前人研究结果的异同，验证了本文所构建模型的适用性。研究结果表明：(1)地表地震动强度大，断裂带投影区域，单、双断层模型最大PGA分别达1050和1145 cm/s2，最大PGV分别达472和291 cm/s，最大PGD分别达107和652 cm;(2)震源模型对模拟地震动影响大，单、双断层模型断裂带地表投影区最大PGA、PGV和PGD分别差95 cm/s2、181 cm/s及545 cm;(3)单断层模型地震动随断层距的衰减拟合效果优于双断层模型地震动，除双断层模型EW分量PGD值随断层距增大而衰减的速度慢于其他两分量外，单、双断层模型的PGA、PGV及其余各分量的PGD随断层距增大的衰减速度相当;上盘地震动随断层距增加的衰减速率快于下盘;(4)察隅Mw8.6级地震在各拟建工程场点均产生了较强的地震动和明显的永久地表位移，为防止大震可能造成的严重地震灾害，建议各工程场点采取必要的措施减轻震害损失。 |
| 英文摘要: |
| In order to obtain the spatial distribution of the ground motion of the 1950 Chayu Mw8.6 earthquake，and to explore the influence of the source model on the simulated ground motion and the influence of the earthquake on the lower reaches of the Yarlung Zangbo River，the single-fault and double-fault kinematic hybrid source models were established on the basis of previous studies.Considering the lithospheric velocity structure model USTClitho1.0 and the global crustal model Crust1.0，the underground one-dimensional velocity structures corresponding to the single-fault model site and the double-fault model site were constructed respectively.The spectral element method was used to study the ground motion synthesis in the target area of the 1950 Chayu Mw8.6 earthquake.By comparing the similarities and differences between the simulated acceleration time history and response spectrum of the four observation points in the target area and the previous research results，the applicability of the model constructed in this paper is verified.The analysis results of ground motion characteristics in the study area show that：(1) the surface ground motion intensity is large.In the projection area of the fault zone，the maximum PGA，PGV，and PGD of the single and double fault models are 1050 cm/s2 and 1145 cm/s2，472 cm/s and 291 cm/s，and 107 cm and 652 cm，respectively.(2) The source model has a great influence on the simulated ground motion.The maximum difference of PGA，PGV and PGD in the surface projection area of the single and double fault model is 95 cm/s2，181 cm/s and 545 cm，respectively.(3) The attenuation fitting effect of single-fault model ground motion with fault distance is better than that of double-fault model ground motion.Except that the PGD value of EW component of double-fault model decays slower with the increase of fault distance than the other two components，the PGD of PGA，PGV and other components of single-fault model and double-fault model decays at the same speed with the increase of fault distance.The attenuation rate of ground motion in the hanging wall with the increase of fault distance is faster than that in the footwall.(4) The Chayu Mw8.6 earthquake produced strong ground motion and obvious permanent surface displacement at each engineering site.If the historical earthquake is repeated，the adverse effects of the earthquake will inevitably occur at each engineering site，and attention should be paid to preventing the occurrence of serious earthquake disasters. |
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