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《Plateau Earthquake Research》 2011-01
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DIFFERENCE ORDER'S BOUNDARY EFFECT OF THE SEISMIC WAVE NUMERICAL SIMULATION

CHEN Keyang(Exploration and Development Research Institute of Daqing Oilfield Company Limited of CNPC,Daqing, Heilongjiang Province,Daqing 163712,China)  
The paper puts forward a problem on boundary reflective effect during the forward numerical simulation,which is caused by the incoherence within the computational grids of difference order(precision),verified it by different difference-order centered-grid finite-difference scheme for the acoustic wave equation.The numerical examples show that there are no boundary effects among the grids with the same difference orders,if the difference order of the adjacent grids is low and varies greatly,the boundary effect is obvious,however,the boundary effect can be effectively suppressed by reducing the varied orders between adjacent grids and improving the discrete difference order,and the Signal to Noise and high credibility can be ensured.
【CateGory Index】: P315.8
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