摘要
目的地震波场数值模拟中,研究胀缩源、集中力源、剪切源在各向异性介质中引起的波场特征。方法采用MPML吸收边界,详细地分析了3种震源的加载机理,基于交错网格高阶有限差分法的波动方程进行数值模拟。结果不同震源在介质中对波场类型、偏振方向、各分量的能量分配等特征有较大的影响。结论结果对横波分裂的研究和野外观测系统的震源研究有一定的理论指导意义。
Aim In the numerical simulation of seismic wave, studying the wave field characteristics originated from expansion source, concentrated force source and shear source. Methods Using MPML absorbing boundary, analyzing in detail the loading mechanism of three kinds of source based on wave equation of straggered-grid high- order finite difference method. Results Different souce in the medium will have influence in wave type, polariza- tion direction and energy distribution of every component, etc. Conclusion The result is constructive to study shear wave splitting and source research of field observation svstem.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第6期902-906,共5页
Journal of Northwest University（Natural Science Edition）
基金
国家自然科学基金资助项目(40904009)
中央高校基本科研业务专项基金资助项目(CHD2011JC193)
关键词
各向异性
交错网格
胀缩源
集中力源
剪切源
anisotropy
staggered-grid
expansion source
concentrated force source
shear source
