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RESEMBLANT CHARACTER OF VERTICAL CRUSTAL DEFORMATION AND GRAVITY ANOMALIES BEFORE MACROSEISM IN NORTH CHINA

Liu Shanhua,Yin Rongzhen,Li Min and Chen Bailu\;(Center for Comprehensive Surreying,CSB,Beijing\ 100039)  
The resemblant character of the vertical crustal deformation and gravity anomaly before three macroseism in Tangshan, Datong and Zhangbei are studied and summarized.Both the vertical crustal deformation and gravity show positive anomaly before earthquake.According to continental dynamics the rise of upper mantle leads to this result.The mechanism of Datong earthquake is similar to these of the earthquakes occurring in Tangshan and in Zhangbei.It is possible that the development and occurrence of macroseism in North China are all related to the rise of hot mantle material,and this is the main genesis of intraplate earthquake.The close attention should be paid to the crossing position of the high-conducting Iayer with the big deep fault in upward mantle area.The Yanhuai area may be a danger area of strong quake developing in the future. The above analysis is significant for forecasting the coming macroseism, especially in the area, on whose surface there is no obvious fault.
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