利用Hartley变换模拟各向异性介质地震波场

Seismic wave modeling in anisotropic medium by Hartely transform

伪谱法在地震波场的模拟中具有很重要的作用。然而，基于傅氏交换的伪谱法运算速度慢，占用计算机内存较多。Hartley变换是一种快速的交换方法，能克服傅氏交换的上述快陷．本文对Hartley交换在各向异性介质波场模拟中的应用、稳定性条件、吸收边界因素的确定、折叠效应的克服以及介质分界面处弹性参数空间导数的求取等方面进行了讨论．并提出一种消除非传播振型波场的震源区衰减方法。

Pseudospectral method plays a very important role in modeling seismic wave field. However,the pseudospectral method based on Fourier transform brings slow computation and uses more internal storage of computer. Hartley transform can re-move these defects because it is faster than Fourier transform. The article details how we apply Hartley transform in wave field modeling in anisotropic medium,de-termine stable conditions and absorption boundary,remove folding effect and solve for space derivative of elastic parameter at interface. In addition,near source method for attenuating non-propagated vibration wave field is recommended here.