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Investingation and Analysis on Macroscopic Anomalies of Earthquake before and after Wenchuan M_S8.0 Earthquake in Longnan Area of Gansu Province

YAN Wu-jian1,2,ZHU Zhao-xia3,LI Xiao-feng2,ZHANG Hui2(1.Department of Geophysics,Peking University,Beijing 100871,China; 2.Earthquake Administration of Gansu Province,Lanzhou 730000,China; 3.Hydrology and Water Resource Bureau of Gansu Province,Lanzhou 730000,China)  
Based on the field investigation result for the macroscopic anomalies appeared before and after Wenchuan MS8.0 earthquake on May 12,2008(from April 1,to July 13)in Longnan municipality and Zhouqu county of Gannan prefecture,Gansu province,through compilatio,analysis and selection for those data,the temporal and spatial distribution characteristics of the anomalies are researched.The result shows that amount of the macroscopic anomalies increased gradually with the time to event,and formed a peak just before the earthquake.In spatial more macroscopic anomalies distributed in higher earthquake intensity area.The relationship between the macroscopic anomalies and earthquake mechanism,as well as a possible effect for earthquake prediction are discussed also.
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