However, the displacement and deformation of surface ground by underground mining have destroyed initial equilibrium between the building and the ground.
但是由于地下开采引起地表产生的移动和变形，破坏了建筑物与地基之间的初始平衡状态。
2
It is possible to yield incorrect results including false long period components, during the restitution of the grounddisplacement from digital seismograms directly using FFT.
直接使用FFT由数字地震记录来恢复地面位移可能产生包括虚假的长周期分量在内的不正确结果。
3
Comparing the recovered results of FFT with the displacement obtained by the iteration method shows that the approach proposed in this paper indeed improves the estimation of the grounddisplacement.