起伏地表二维瑞雷面波正演模拟及波场分析  

FORWARD MODELING AND WAVE FIELD ANALYSIS OF 2D RAYLEIGH WAVE BASED ON IRREGULAR TOPOGRAPHY

作　　者：熊章强[1] 南坤[1] 唐圣松[2] 

机构地区：[1]中南大学信息物理工程学院,湖南长沙410083 [2]西安地质矿产研究所,陕西西安710000

出　　处：《物探化探计算技术》2010年第5期470-475,共6页Computing Techniques For Geophysical and Geochemical Exploration

摘　　要：采用高精度交错网格有限差分法,建立了在起伏地表条件下瑞雷面波数值模拟的自由边界条件,通过对倾斜二层模型模拟的结果与解析解对比,二者完全一致,由此证明了起伏地表下瑞雷面波数值模拟的正确性。在此基础之上,模拟并分析了小凸起与小凹陷模型条件下,瑞雷面波的波场传播特征。通过分析得出瑞雷面波在这二种地形传播时,都存在反射、波型转换,以及能量再分配。因此,在起伏地表条件下,利用瑞雷面波进行勘探时要考虑起伏地表对瑞雷面波波场的影响。A free surface condition for Numerical Simulation of Rayleigh wave has been built by using high precision staggered grids finite difference.The result of two inclined layer model simulating shows that error between numerical and analytic solutions is almost equivalent,which proves that Numerical Simulation of Rayleigh wave based on irregular topography is correct.Basis on this,we have got the propagation characteristics of Rayleigh wave from modeling a small heave topography and a small depressed topography models.Finding that there are reflection,waveform transformation and re-allocation of energy in the course of passing topography.Therefore,the effect of irregular topography must be considered when Rayleigh surface wave exploration is used.

关 键 词：起伏地表 瑞雷面波 交错网格有限差分 正演模拟 

分 类 号：P315.31[天文地球—地震学]