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Variation of Comprehensive Weighted Information Entropy of Seismic Precursors Before the Lanchang-Gengma M_S 7.6 Earthquake

Zhang Zhaodong 1) Liu Zhangzen 2) Dong Chuanfu 1) 1)Seismologicd Burean of Shandong Provence,Jinan 250014,China 2)The First Middel School of Xin County,Xin County 252400,China  
In this paper,each anomalous event before the Lanchang-Gengma earthquake is comprehensively estimated by using"seismic prediction exprert system".Probability of anomaly appearance is calculated by means of time that corresponds to the most likely time of earthquake occurrence for each anomaly.Considering the anomalous reliability,validity,significance and dependence,the authors use different weight to study the relation between comprehensive weighted information entropy of the seismic precursoris and earthquakes and analyse the information entropy variation before the Lanchang-Gengma M S 7.6 and 7.2 earthquakes on Nov.6,1988.It is shown that the variation of ordered decrease entropy appeared before the earthquekes.
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