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2.5D Numerical simulation of seismic wave in inhomogeneous media

WU Ye1,2,LI Xiao-fan1,GU Guan-Wen3,LONG Gui-Hua1,ZHAO Xiao-yan2,WU Ba-te-er2(1.Institute of Geology and Geophysics Chinese Academy of Sciences,Beijing 100029,China;2.Institute of Disaster Prevention Science And Technology,Yanjiao 101601,China;3.Institute of Geophysical & Geochemical Exploration,Langfang 102800,China)  
At present,pure 3D elastic wave numerical simulations still require huge computation resources and 2D elastic wave numerical simulations can not accurately represent 3D situation.Thus this paper puts forwards a kind of 2.5D numerical simulation method which computes 3D elastic wave fields in 2D media by using the time-staggered difference pseudospectral method based on high accurate one-order elastic wave equations expressed with velocity and stress.Compared with 2D and 3D simulation results,the 2.5D results are closer to 3D results than 2D results in waveformes and amplitudes.And it confirms that the 2.5D method proposed in this paper,in 3D waveform simulation,is better than 2D method to approximate the 3D wave field and the time-staggered difference pseudospectral method is efficient and accurate in forward modeling.
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