【摘要】 本文提供了丽江７０级地震前滇西北地震活动空间容量维、关联维、信息熵十分显著的异常图象；这些异常是在大震孕震区形成、应变释放加速阶段之后出现的，恰好揭示了源区、近源区大释放前的非线性变化过程。这与１９６５年以来云南及邻区８组大震前地震分形研究的结论完全一致；进一步说明地震活动分形异常对地震孕育的短临阶段具有重要的指示意义更多还原

【Abstract】 Very striking anomalous images for spatial content dimension,correlation dimension and information entropy of seismicity in north-western Yunnan before large the M 7 0 Lijiang earthquake in Feb. 1996 are given in this paper. The anomalies appeared after forming of the seismogenic area of the large event and acceleration of strain release, which just reveals nonlinear evolution process in the source and near source areas, is identical with the results of seismic fractal study before the eight large events occurred in Yunnan and its neighboring regions since 1965. It shows that fractal anomaly of seismicity has a important indicative significance to short-impending stage of earthquake preparation.更多还原