基于快速行进法地震层析成像研究  

Research on seismic tomography based on fast marching method

作　　者：任卫波 REN Weibo(Geological Construct on Engineering Irwestigation Institute of Guangdong Province,Guangzhou 510000)

机构地区：[1]广东省地质建设工程勘察院,广州510000

出　　处：《矿产勘查》2020年第5期977-987,共11页Mineral Exploration

摘　　要：地震层析成像是通过对观测到的地震波运动学特征(射线路径、走时)和动力学特征(振幅、相位、频率)的资料进行分析,反演得到地下地质体结构、速度分布等信息的一种地球物理方法。由于快速行进法具有无条件稳定、精度高、适应能力强等优点,所以被广泛应用于地震层析成像领域。本文将二维快速行进法应用于地震层析成像的研究中,完成了均匀介质情况下的入射波和反射波走时场及射线路径模拟,结果表明基于快速行进法在二维速度随深度线性变化及横向各向异性的模型正演中取得了理想的效果。Seismic tomography is based on the analysis of the observed kinematic characteristics( ray path,travel time) and dynamic characteristics( amplitude,phase,frequency) of seismic waves,so as to obtain the structure,velocity distribution,etc. of the underground geological body. A geophysical method of information. Because the fast traveling method has the advantages of unconditional stability,high precision and strong adaptability,it is widely used in the field of seismic tomography. In this paper,the two-dimensional fast marching method is applied to the study of seismic tomography. The incident and reflected wave travel time and ray path simulations in the case of uniform medium are completed. The results show that the fast traveling method varies linearly with depth in two-dimensional speed. And the lateral anisotropy model has achieved the desired effect in the forward modeling.

关 键 词：快速行进法 入射波旅行时场 反射波旅行时场 射线路径 地震成像 深地探测技术 

分 类 号：P631.4[天文地球—地质矿产勘探]