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CHARACTERISTICS OF SURFACE GRAVITY CHANGES CAUSED BY A FAULT OR FAULTS DISLOCATION

Tan Hongbo1,2),Shen Chongyang1,2)and Li Hui1,2)1)Institute of Seismology,CEA,Wuhan 4300712)Crustal Movement Laborator,Wuhan 430071  
According to the theory of gravity changes caused by dislocation on a rectangular plane buried in a homogeneous elastic half-space the characteristics of surface gravity changes caused by one fault or combination of two faults are studied.The main conclusion are:1)For one fault,the effect of surface elevation change is larger than the effect of density change or horizontal displacement change.The depth of the fault,the dip angle,the magnitude of dislocation(%U-1、U-2、U-3%)and the way of dislocation have also large effects on the surface gravity change;2)For the combination of two faults,when they are in the same depth,the relative position of the faults have great effect on the surface gravity changes,when they are in different depth,the shallow fault plays a dominant role in the total surface gravity change,but the deep fault may also have great effect on it if the deep fault has different characters.
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