地表流体变化对我国地壳垂直形变的影响

研究了大气、海洋、土壤水与积雪质量变化对我国25个GPS基准站地壳垂直形变的影响。谱分析结果表明，垂直形变周期为12个月，半周期为6个月，基准站高程主要表现为季节性变化，最大可达20mm。通造对负荷效应与GPS监测结果的相关分析和显著性检验可知，96％的基准站相关系数在99％的置信度水平上，也说明两者有较强的线性相关关系。

Vertical Crustal Displacements in China Due to Surface Fluid Changes

Using the model data for surface mass changes of atmosphere, ocean, soil moisture and snow depth, the vertical crustal displacements of 25 ficual stations in China are calculated. From spectral analysis of the results, we can see that the periods of displacements are 12 months and the semi-periods are 6 months. The results also show that the maximum seasonal displacements can reach 20 mm and even larger. The covariance and significance tests show that the coefficients of 96 percent of stations are significant at the 99% significance level, which implies the perfect linear correlativity and coherence. The results show that one of reasons of the vertical cncstaldisplace ments is the changing surface fluid coads.