ZHAO YouJia,
ZHANG GuoHong,
SHAN XinJian et al
.2018.Numerical simulation of the strong ground motion of the 2008 Wenchuan Earthquake incorporated with topography and barrier rupture model.Chinese Journal Of Geophysics,61(5): 1853-1862,doi: 10.6038/cjg2018M0228
考虑地形起伏和障碍体破裂的汶川地震强地面运动数值模拟
赵由佳, 张国宏, 单新建, 尹昊, 屈春燕
地震动力学国家重点实验室, 中国地震局地质研究所, 北京 100029
Numerical simulation of the strong ground motion of the 2008 Wenchuan Earthquake incorporated with topography and barrier rupture model
Abstract:The MW7.9 Wenchuan earthquake occurred in the Wenchuan area of Sichuan Province on May 12, 2008, at a location of 103.4°E and 31.06°N, and caused severe building damages and heavy casualties in Wenchuan, Yingxiu and their surrounding areas. Because of the complex mountainous terrain, timely rescue was difficult. In order to better understand the influence of topographic factors on the numerical simulation of strong ground motion, two kinds of models are established, one with complex topography effect and the other without. Additionally, according to kinematics inversion of source rupture, we incorporate earthquake source rupture model with asperity and barrier models. We also implement the spatial-temporal variations of fault segmentation, inclination and slip rake angles in the simulations. Based on the dynamic simulation of the ground motion, numerical calculation of seismic wave propagation and post-processing analysis, we simulate the ground motion induced by earthquake. The results show that: 1) the topographic effect varies with the distance between fault and strong motion station. The closer the distance is, the more obvious the topographic effect is, vice versa. 2) Due to the influence of topography, the peak of ground motion may occur outside the epicenter. 3) In model I, Peak Ground Velocity (PGV) distributions resulted from current simulation show much higher PGV values in the areas of Wenchuan, Beichuan than other places. In model Ⅱ, higher PGV area is located in the second half of the Guanxian-Jiangyou fault, near areas of Qingping, Anxian. The numerical modeling developed in this study has potential application in the ground motion prediction for the earthquake engineering. In addition, the numerical simulation could also be used to generate near-real-time shaking map in the implementation level.
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