云南10次大震前地震活动分形研究

Fractal Staudies of Seismicity before 10 Great Earthquakes in Yunnan

本文通过１９６５—１９９３年发生在云南及邻区８组１０次６．８≤Ｍ≤７．７大震前空间容量维、关联维、信息熵等多种参数系统的计算研究，发现１０次大震前降维减熵异常十分显著；并分别给出了容量维Ｄｃ、关联维Ｄｆ、信息熵Ｓ的正常变化值、异常判别值和短临预报阀值等；在Ｄｃ，Ｄｆ，Ｓ用于地震短临预报实用化方面取得了有意义的实验结果。

Through calculative studies on various parameters systems of fractal dimension, correlation dimension and spatial entropy before 10 great earthquakes with 6. 8≤M ≤7. 7 in Yunnan and its adjacent areas during 1965-1993, it is found that dimension drop and entropy reduction before the earthquakes was remarkable. Normal variations anomaly-distinguishing values and critical values for short-impending prediction of Dc, Df and S are also presented, Dc, Df and S used as practical short-impending prediction have got significant expeimental results.