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TWO-DIMENSION PICTURES OF GRAVITY CHANGE IN WESTERN YUNNAN AND THEIR RELATIONS TO THE EARTHQUAKES M_s>5.0

Jia Minyu;Xing Canfei and Sun Shaoan(Institute of Seismology,State Seismological Bureau,Wuhan 430071)  
Based on the area network,the synthetic gravity network including absolute network,micro-network and vertical gradient lines spreads in western Yunnan.The total observation stations are more than 150.Since 1985.the gravity network has been repeatedly measured at regular intervals and a great quantity of observational data was obtained.The method of drawing continuative change picture from discrete observation data in the area is studied, 23items of two-dimension pictures of gravity change are given.This method is in advance of using ordinary method including section difference and point values for studying tectonic activity.It can remove the appreciable error from observational data,filter away the disturbances of shallow and part area and be easy to diagnose the change characters in the total area.Then.the relations between the pictures and 9 earthquakes Ms5.0 which occurred in and around the area during the measurement period are studied too.The earthquakes occurred nearby the zero lines of gravity anomalies.There is a positive anomaly area with above 120 nms-2 gravity change before the earthquakes,and the bigger the earthquake magnitude the more the gravity anomaly.Before earthquakes,the gravity change lasted about 3 years,the gravity was up at first.then was down and the earthquake occured.It is less than a year from the turn of gravity change to the earthquake.
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