澜沧—耿马7.6级地震前中小地震活动信息熵和分维的研究

从信息论原理和分形几何学的观点出发,采用多种方法,分析研究1988年澜沧—耿马7.6级地震前地震活动的信息、信息熵和分维的变化特征表明,地震前1—2年内,中、小地震活动的信息熵、缺信量和容量维、信息维出现明显的低值变化过程,反映了地震前兆的减熵、降维特点,从一个侧面反映了大震前,一定区域内中、小地震活动的时空变化从无序向有序的演化过程。

STUDY ON THE INFORMATION ENTROPY AND FRACTAL DIMENSION FOR MIDDLE AND SMALL EARTHQUAKE ACTIVITIES BEFORE LANCANG-GENGMA 7. 6 EARTHQUAKE

Various kinds of the methods were used to analyse the variation characteristics of seismicity information, entropy and fractal dimension occurred before Lancang-Gengma 7. 6 earthquake in 1988,based on the view of both information theory principle and fractals geometry. The result indicated that there a peared obvious variation process of low value in information entropy, information content shortening, content dimension and information dimension of middle and small earthquakes 1-2 year prior to the shock which reflected not only the features of entropy decrease and dimension reduce for earthquake precursor ,but also the evolutionary process of spacio-temporal variations from disorder to order for small earthquake activities in a certain region before large earthquakes.