Simulation of Three-Dimensional Topographic Effects on Seismic Ground Motion in Wenchuan Earthquake Region Based Upon the Spectral-Element Method
详细信息
- 责任者：Hu Yuanxin (College of Civil Engineering ; Chongqing University ; Chongqing 400045 ; China) ; Liu Xinrong
- 刊名：Journal of Lanzhou University (Natural Sciences)
- 出版年：2011
- 卷期：47(4)
- 关键词：地形 ; topography ; 地震动 ; ground motion ; 四川 ; Sichuan Province
- 页码：p.24-32
- 图表：6 illus., 1 table, 34 refs.
- 分类号：1702
- issnNo：ISSN0455-2059
- isbnNo：CN62-1075/N
摘要
The effects of topography on seismic ground motion of Wenchuan earthquake were simulated based upon elastodynamic equation for 3D wave propagation, the spectral-element method, ASTER DEM model and parallel computation environment and incorporated realistic 3D topography and attenuation of media. The simulated results show that topographic effects due to great rough terrain on two horizontal components of seismic wave are bigger than those on vertical component. The max PGA value in zone near epicentre is 671 cm/s2, while large PGA values are almost located near mountain tops and ridges. It can be concluded that the effects of 3D realistic topography on seismic ground motion are more complex than those of the existing 2D generalized model.