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STUDY ON MECHANISM OF GRAVITY FIELD CHANGE IN NORTHEASTERN MARGIN OF QINGHAI-TIBET PEATEAU

Through whole adjustment calculation of the gravity observations of the northeastern edge of Qinghai-Tibet plateau,the gravity field variation characteristics in 1993-2003 are analyzed systematically.It is found that significant gravity changes appeared to be concentrated in regions with active faults.By using the calculated results of gravity and leveling data,the characteristics of single layer density time-varying image during 1993-2003 of the northeast edge of Qinghai-Tibet plateau are studied and it can be recognized that the seismic activity is related with the partial anomaly and high gradient of the variations of crustal density and the bending of its isoline.On the basis of the regional Bouguer gravity anomalies of northeastern edge of Qinghai-Tibet plateau and artificial seismic profile information,the distribution characteristics of Moho surface are inversed.Further more,the density deformation of crust and the influence of the displacement on the gravity change of the earth surface is studied as well.The spatial correlation between regional microgravity long-term change and Bouguer gravity anomalies of the northeastern edge of Qinghai-Tibet plateau are explained.