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《CRUSTAL DEFORMATION AND EARTHQUAKE》 2000-01
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THE GRAVITY VARIATION DURING THE BREAKING PROCESS IN EARTH CRUST

Zhang Yongzhi 1) , Zhang Keshi 2) 1) No.2 Crustal Deformation Monitoring Center,CSB,Xi'an 710054 2) Xibei Industrial University,Xi'an 710072  
On the basis of the mechanical theory in the porous media the relationship between stress and strain is deduced when there exist micro holes in earth crust.The parameter K which describes the breaking process in earth crust is discussed.The physical meanings of state of the earth crust change with K and the formulas which express gravity variation with k are also derived. The gravity variation distribution on earth surface is calculated by using GTN model.The gravity variation from 1992 to 1996 in southwest China,Yunnan province where Lijiang M s=7.0 earthquake occurred in 1996 is compared with computed results. At last, the process of gravity variation during Lijiang earthquake is explained reasonably.
【Fund】: 国家自然科学基金资助项目!( 49774 2 14 );; 国家九五科技攻关项目!( 96 9130 7)
【CateGory Index】: P315
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