A source fast sweeping method for solving elliptically anisotropic eikonal equation
CUI Ningcheng1,2, HUANG Guangnan1,2, LI Hongxing1,2, ZHANG Hua1,2, ZHANG Xiaofeng1,2, XIAO Kun1,2
1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, Jiangxi 330013, China;
2. Department of Geophysics, School of Geophysics and Measurement-control Technology, East China University of Technology, Nanchang, Jiangxi 330013, China
Abstract：The seismic traveltime calculation is an important part of ray tracing,tomography,and seismic migration.Conventional traveltime fast sweeping methods scan directly the global computational domain without considering the scanning validity.In a real calculation,the scanning without the source point is invalid due to the lack of source information and cannot calculate right traveltime.In this paper,a source fast sweeping method is proposed,which moves the starting point of scanning to the source without invalid scanning,and improves the calculation efficiency.The source fast sweeping method in elliptical anisotropy medium is realized based on the factored eikonal equations and upwind difference scheme.Numerical simulation results show that the proposed source fast sweeping method obtains the same results as conventional methods,but it achieves higher calculation efficiency.
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