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Zhang Xiaotao,Zhang Yongxian,Xu Dunhuang
Author NameAffiliation
Zhang Xiaotao China Earthquake Networks Center,Beijing 100045,China / Institute of Earthquake Science,China Earthquake Administration,Beijing 100036,China 
Zhang Yongxian China Earthquake Networks Center,Beijing 100045,China 
Xu Dunhuang Centre National de la Recherché Scientifique,Paris 75005,France 
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Investigation of the Macroscopic Anomalies before and after the M8. 0 Wenchuan Earthquake
Zhang Xiaotao,Zhang Yongxian,Xu Dunhuang
Abstract:
The macroscopic anomalies before and after the May 12,2008 Wenchuan M8. 0 earthquake were collected and analyzed in this paper. The credible anomalies occurring from February 1 to June 10,2008 were treated as macroscopic anomalies,and their space-time distribution was studied. The research indicates that in time distribution,the number of macroscopic anomalies peaked before the earthquake,and these peak values appeared twice after the earthquake. In space distribution,the distribution of macroscopic anomalies before the earthquake was the same as that after the earthquake. In this paper,the mechanism of occurrence of macroscopic anomalies and the role of macroscopic anomalies in forecasting earthquake were also discussed.
Key words:  Wenchuan earthquake  Macroscopic anomaly  Statistical analysis  Space-time distribution