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《Geophysical and Geochemical Exploration》 2009-04
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PML ABSORBING BOUNDARY CONDITION FOR NUMERICAL MODELING OF RAYLEIGH WAVE

XIONG Zhang-qiang1,TANG Sheng-song1,ZHANG Da-zhou2(1.School of Info-Physics and Geometrics Engineering,Central South University,Changsha 410083,China;2.Institute of Geophysics and Geomantics,China University of Geosciences,Wuhan 430074,China)  
The algorithm of the finite difference of-order velocity-stress staggered grids has been built,which is suitable for the perfectly matched layer(PML) absorbing boundary for elastic media.Meanwhile,the construction of the PML absorbing boundary condition and the realization of the finite-difference algorithm are discussed in detail.Wave field modeling calculations show that,compared with the conventional decaying exponential absorbing boundary and non-absorbing boundary,the PML absorbing boundary can perform absorption much more clearly and absorb the boundary reflection from various angles,whose absorptivity(the ratio of absorption energy to unabsorbable energy) can reach 99.99%.The PML absorbing boundary can well eliminate the periodic folding effects,which makes the calculation of the wave field characteristics very distinct,and the Rayleigh wave can be clearly shown in the waveform record.
【Fund】: 江西省自然科学基金项目(05560003);; 江西省科技攻关项目联合资助
【CateGory Index】: P631.4
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