【摘要】 为了有效提高地震波正演数值模拟精度,提出了一种优化的通量校正传输方法,即在每一步时间递推过程中,沿坐标轴方向和对角线方向均引入通量校正参数进行波场校正处理,以高频散的均匀介质地震模拟波场为例,研究对比了不同中心网格有限差分近似阶数、传统的FCT方法和优化的FCT方法校正得到的地震波场效果。数值计算结果表明,传统的FCT方法容易产生虚假波场,而优化的FCT方法可以削弱或消除这些假波动,并指出结合高差分阶数和应用优化的FCT方法可以更好地提高数值模拟记录的信噪比。更多还原

【Abstract】 In order to improve forward numerical simulation precision of seismic wave,this paper puts forward an optimized flux-corrected transport method,the flux corrected parameters are introduced along the coordinate and diagonal directions at each step of the numerical iteration to correct the wave field,and takes the seismic wave field simulation with high-dispersion as example,and compares the corrected seismic wave results among different centered-grid finite-difference approximating order and conventional FCT method and optimized FCT scheme.The numerical results show that: conventional FCT method can easily introduce false wave field which could be reduced or removed by the proposed method.At the same time,the author points out numerical precision of the records can be greatly improved by combining the methods of high-order difference and optimized FCT scheme together.更多还原