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运用分形理论的基本原理，选取了河北及京津7口井的水氡观测资料，进行了广义分维计算。从所计算的7口井1972～1978年广义分维动态曲线上可见，1976年7月唐山7．8级地震前，有5个井孔资料的降维过程明显，2个井孔资料的降维过程不太明显，有2个井孔资料的广义分维值在震后仍下降，分维值大小也因不同井孔而异。结果表明；震前降维可为地震预报提供依据。
Using the basic principle of fractal theory, we selected the observation data of water radon from 7 wells in Hebei and Beijing-Tianjin, and calculated the generalized fractal dimension. From the calculated generalized fractal dynamic curves of seven wells from 1972 to 1978, it can be seen that before the Tangshan MS7.8 earthquake in July 1976, the five well bore data have a significant dimensionality reduction process and the two well bore data Dimensional process is not obvious. The generalized fractal dimension values of two well bore data still decrease after the earthquake, and the fractal dimension value varies with different boreholes. The results show that the pre-earthquake dimension reduction can provide the basis for earthquake prediction.