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应用分形理论与方法，计算了唐山、海城、澜沧－耿马地震前小震活动能量分布的信息维及其在空间上的差异和时间上的变化，结果表明：（１）局域空间分数维可以反映大震前小震活动能量分布的空间变化特征，大震发生在信息维中等值区；（２）局域时间分数维显示大震前小震活动存在降维过程，且大震发生在降维之后的升维过程中或发生在降维过程结束之时
The fractal theory and method are applied to calculate the information dimension of small earthquake activity energy distribution before Tangshan, Haicheng and Lancang-Gengma earthquakes and their spatial and temporal variations. The results show that: (1) local space The fractal dimension can reflect the spatial variation of the energy distribution of the small earthquakes before the large earthquakes. The large earthquakes occur in the equivalent area of the information dimension. (2) The local time fractal dimension shows that the small earthquakes before the large earthquakes have the dimensionality reduction process, and the large earthquakes Occurs in the dimension-raising process after dimensionality reduction or at the end of the dimensionality reduction process