【摘要】 研究目的:地震波数值模拟技术是勘探地球物理学中的重要组成部分,研究通过弹性波一阶速度-应力方程,采用交错网格高阶有限差分法实现了地震波在各向同性介质中的高精度的数值模拟,并采用完全匹配层(PML)吸收边界来消除边界反射,可取得较好的效果。研究结论:通过模型的正演计算和复杂模型的处理结果表明,交错网格高阶有限差分法数值模拟是一种快速有效的地震波数值模拟方法。可用于为地震勘探选择采集参数,优化观测系统提供依据,以提高采集数据的质量,有效地解决铁路勘察过程中的地质问题。更多还原

【Abstract】 Research purposes: The technology of seismic wave numerical simulation is an important part in the geophysical prospecting.In this paper,based on the elastic-velocity-stress equation,the numerical simulation of seismic wave propagation in isotropic media is carried out with staggered-grid high-order finite-difference method,and the perfectly matched layer(PML) is used to absorpt boundary to eliminate the boundary reflection.The result of simulation is rather perfect. Research conclusions:The results of forward computation and the seismic process of a complex model show the staggered-grid high-order numerical simulation is a rapid and efficient simulation method for seismic wave propagation.This method can be used for the selection of acquisition parameters in seismic exploration and for the optimization of the observation system to improve the quality of the acquisition data and solve the geological problems in railway exploration.更多还原