fk正演模拟，生成地震记录。由于是本人最早写的程序，里面的离散傅里叶变换并非快速傅里叶变换。读者可改成快速傅里叶变换-fk forward modeling to produce seismic records. I write because it is the first program, which is not a discrete Fourier transform fast Fourier transform. Readers can change the fast Fourier transform