【摘要】 该文提供了1996年2月丽江7.0级大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像；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阶段具有重要的指示意义。更多还原

【Abstract】 The space Hausdoff dimension, correlation dimension and information entropy ofseismicities appeared anoma1ously in north-western Yunnan before Lijiang M7.0earthquake in February 1996- These anomalies occurred after the formation of largeearthquake preparation zone and the acceleration of energy release, which just indicates anonlinear developing process in and near the source zone before the final energy release. Itis fully agreed with the results of the fractal study before 8 large earthquakes occurred inYunnan Province and its adjacent region since l965. It is shown that the fractal anomaly ofseismicity is of important indicative significance for earthquake preparation.更多还原