【摘要】 常规起伏地表地震波数值模拟均将地表以上的介质视为真空介质来处理,而这与实际情况不符。为解决这一问题,将地表以上介质视为声学介质,使地震波在该介质中以350m/s的速度传播。以两层起伏地表速度模型为例,分别采用声波和各向同性弹性波波动方程进行正演数值模拟,并与常规基于真空介质假设的计算结果进行对比,结果表明,基于声学假设的模拟记录可以更加有效地模拟真实的数据采集,并且反射波同向轴具有更好的连续性。更多还原

【Abstract】 General seismic wave numerical simulation with relief surface treats the medium above the surface as vacuum medium,and it is different with practical situation.In order to solve the above problems,the paper treats the medium above the surface as acoustic medium with propagating acoustic velocity of 350m/s.Take two-layer velocity model with relief surface as example,by using acoustic wave equation and isotropic elastic wave equation to do the numerical simulation,respectively,and comparing with general computational results based on vacuum medium hypothesis.The results show that the simulating records based on acoustic wave hypothesis can be effectively simulated the practical data,and the reflective wave has better property of consistence.更多还原