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根据数学上曲面拟合度的概念定义—平均垂直形变量，来定量分析研究地壳表面垂直形变的强度，这一量值同时具有系统分析性质与统计意义。采用50～90年代中国大陆趋势性的垂直位移计算结果，并利用这一方法研究了中国大陆垂直形变强度背景值的分布特征及其与地震危险性的关系；利用华北地区1965～1988年多期垂直形变资料，研究了1976年唐山7.8级大地震前后华北地区垂直形变强度随时间变化的动态过程，得到了强震的孕育—发生—调整过程中大范围垂直形变非线性过程及正常变化背景值。结果表明，所采用的分析方法比较客观、定量地反映了地壳垂直形变强度，对地震分析预报研究具有实用意义。
According to the concept definition of mathematical fitting degree of surface fitting, the average vertical deformation is used to quantitatively study the intensity of vertical deformation on the surface of the crust, which has both systematic and statistical significance. Using the vertical displacement calculation results of the trend in mainland China from 1950s to 1990s and using this method to study the distribution characteristics of the vertical deformation strength background value in the Chinese mainland and its relationship with the earthquake risk, Vertical deformation data to study the dynamic process of the vertical deformation intensity change in North China before and after the 1976 Tangshan Ms8.8 earthquake with time, and the large-scale vertical deformation nonlinear process and normal changing background value during the gestation-occurrence-adjustment process of strong earthquakes . The results show that the analysis methods used are objective and quantitative to reflect the crustal vertical deformation strength, and are of practical significance for the study of earthquake prediction.