摘要
地震走时层析成像法是一种利用不同地震台站连续接收到的地震事件,利用地震走时断层扫描反演地球内部速度分布的方法,主要分为正演(射线追踪)和反演两个环节。首先正演利用基于程函方程的快速行进法,实现了对入射波走时场和反射波走时场的计算,接着进行了射线追踪与走时灵敏度矩阵的计算,最后反演采用了子空间算法实现了反射波走时反演,反演成像结果可以分辨出异常体的形状和位置。
Seismic travel time tomography is a method to retrieve the velocity distribution inside the earth by using the seismic events continuously received by different seismic stations and the seismic travel time fault scanning.It is mainly divided into two parts of forward(ray tracing)and inversion.Firstly,the fast marching method based on the eikonal equation is used to calculate the travel time field of incident wave and reflected wave.Secondly,the ray tracing and travel time sensitivity matrix are calculated.Finally,the subspace inversion method is used to realize the travel time inversion of reflection wave.The inversion imaging results can well distinguish the shape and position of abnormal bodies.
作者
李天扬
李桐林
孟相禹
LI Tian-yang;LI Tong-lin;MENG Xiang-yu(College of Geo-exploration Science and Technology,Jilin University,Changchun 130026,China)
出处
《世界地质》
CAS
2021年第3期664-670,679,共8页
World Geology
基金
国家科技重大专项大型油气田及煤层气开发子课题(2016ZX05026007-001)
国家重点研发计划(2017YFC0601606)
中国博士后科学基金特别资助(站前)项目(2020TQ0114)资助。
关键词
入射波
反射波
快速行进法
子空间反演法
incident wave
reflected wave
fast marching method
subspace inversion method
