三峡库首区地壳垂直变形的模型研究

本文研究了不同力学参数地球模型对三峡库首区地壳垂直变形的影响，结果表明，PREM比Gutenberg-Bullen模型更接近基于三峡地壳分层结构和弹性参数改化的PREM模型的结果，并与之相差很小，但要获得高精度的模拟结果，地球模型中必须利用三峡地壳的弹性参数；利用了地球物理学中较完善的负荷格林函数法，结合精密的蓄水荷载模型和合适的地球模型，其垂直变形模拟结果对监测与地震关系密切的断层运动有重要意义；通过GPS观测和模拟结果的对比，发现2003年蓄水在香溪出现最大幅值约20mm的残差沉降，我们合理地解释为该地段的岩溶渗水荷载的效应.

Crustal vertical deformation models in the front area of three gorges reservoir

In this paper we investigate the effects of the Earth models with different mechanical parameters on the crustal vertical deformation in the front Sanxia Reservoir Area.The results for PREM model are found to be closer to the modified PREM model than Gutenberg-Bullen model.The former is based on crustal layering structure and the mechanical parameters in the area.There is few discrepancy between the results for PREM and the modified PREM.Nevertheless to obtain better results it is necessary to utilize the crustal elastic parameters in the area.Then by using the well-developed loading Green's function method in Geophysics,precise water loading model,and appropriate Earth models,we simulate the loading induced vertical displacements in the area which play an important role in monitoring the fault's motion relevant to earthquakes.Finally by comparing GPS observations with the modeled results we found a residual subsidence in around Xiangxi that can be reasonably considered to be the contribution of the percolation resultant water loads in Carst region.