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《Chinese Journal of Geophysics》 2009-07
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A staggered-grid high-order difference method of complex frequency-shifted PML based on recursive integration for elastic wave equation

ZHANG Xian-Wen~1,HAN Li Guo~1,HUANG Ling~1,LI Xiang~1,LIU Qian-Kun~21 College of Geoexploration Science and Technology,Jilin University,Changchun 130026,China2 China Aero Geophysical Survey & Remote Sensing Center for Land and Resource,Beijing 100083,China  
The classical PML algorithm will make spurious reflection for the waves being incident on the PML interface at near-grazing angles and the evanescent waves within PML. We adopt a nonsplit complex frequency-shifted PML method based on recursive integration, which includes the complex frequency shifted stretching function and substantially improves the performance of the PML boundary condition. Furthermore, we derive a nonsplit staggered-grid higher-order difference method of complex frequency-shifted PML based on recursive integration for elastic wave equation. Compared to the classical PML, the results of models with an elongated domain show the absorption performance to both body waves with grazing incidence and evanescent waves within PML.
【Fund】: 国家“973”项目非均质油气藏地球物理探测的基础研究(2007CB209603)资助.
【CateGory Index】: P631.4
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