An efficient method for computing Green's functions for a layered half-space with sources and receivers at close depths (part 2)
An efficient method for computing Green's functions for a layered half-space with sources and receivers at close depths (part 2)
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DOI：
10.1785/bssa0850041080
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发表时间：
1995-08
影响因子：
3
通讯作者：
Y. Hisada
中科院分区：
文献类型：
--
作者：
Y. Hisada
在这项研究中，我们改进了Hisada（1994）的方法，以有效地计算绿色函数的粘弹性层状半空间的源和接收器位于相等或接近相等的深度。与Hisada（1994）相比，特别是对于震源和接收器靠近自由表面或震源层边界的情况，我们可以大大减小波数积分的范围。这可以通过推导直达波和反射/透射波从边界的解析渐近解来完成，这在Hisada（1994）中被忽略了。我们证明了我们的新方法的有效性和效率的几种情况下。点源和偶极源的FORTRAN程序通过匿名FTP向学术界开放。
In this study, we improve Hisada's (1994) method to efficiently compute Green's functions for viscoelastic layered half-spaces with sources and receivers located at equal or nearly equal depths. Compared with Hisada (1994), we can significantly reduce the range of wavenumber integration especially for the case that sources and receivers are close to the free surface or to boundaries of the source layer. This can be done by deriving analytical asymptotic solutions for both the direct wave and the reflected/transmitted waves from the boundaries, which are neglected in Hisada (1994). We demonstrate the validity and efficiency of our new method for several cases. The FORTRAN codes for this method for both point and dipole sources are open to academic use through anonymous FTP.