ANALYSIS TO THE PRECURSORY ANOMALIES OF SURFACE FLUID BEFORE THE TWO EARTHQUAKES OCCURRED IN LUNTAI OF XINJING

On Sep.23,1999 and Oct.3,2000,a Ms5.1 and a Ms4.7 earthquake occurred in Luntai of Xinjiang respectively.Before the two events,a lot of precursory anomalies of subsurface fluid appeared in north Tianshan mountations area,but there is clearly difference in the anomalies before the two events.In the paper,the mechanism and cause of the anomalies' development are primarily discussed.