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Statistics and analyses of the anomalies of earthquake cases in China′s mainland

ZHENG Zhao-bi~1,ZHANG Guo-min~2,HE Kang~1,ZHANG Lai-ping~1(1.Earthquake Administration of Anhui Province,Hefei 230031;2.Institute of Earthquake Science,CEA,Beijing 100036,China)  
Based on the earthquake cases in China′s mainland from 1986 to 1999,this paper carries out statistics and analyses of the seismometry and precursory anomalies in China′s mainland and its dissimilar subareas.The results show that the numbers,stations and item-percentages of these anomalies increase with the growth of the magnitude.Anomalies appear earlier and their range is wider for stronger earthquakes.The mid-term anomalies are more than the short-term anomalies;the short-term anomalies are more than the impending ones,recently we still lack some efficacious methods,which can catch the impending earthquake anomalies. In seismometry anomalous items,earthquake frequency,seismic gap,b value, earthquake deficiency,seismic stripe,seismic window,precursory earthquakes(or swarms),seismicity pattern and strain release appear more frequently than the other items.In precursory anomalous items,hydrochemistry,hydrophysics,ground deformation,geoelctricity appear more frequently than the other items.In dissimilar areas the seismometry and precursory items that appear more frequently are different,which reveal the regional distinction.
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