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Analysis on Anomalies of Ground Tilts Data in Northern Tianshan Area before and after Wusu MS5.1 Earthquake in 2006

SUN Jia-ning,WEN He-ping,YANG Xiao-fang(Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011,China)  
The observational data of ground tilts in the range of 250 km around the epicenter,before and after Wusu MS5.1 Earthquake on November 23,2006 are analyzed.The result shows,since the beginning of 2005,there were evident quasi-synchronous trend anomalies in most ground tilts observational data.The main abnormal characteristics were trend E and N directions inclination quickly,and most earthquakes occurred after the anomalies ending and speeding up in the opposition,only minority of them did in the process of anomalies.Analyzing spatio-temporal distribution of the anomalies,the nearer to the epicenter,the earlier the anomalies began,and the more the number of abnormal items were,too.Comparing with previous earthquake cases,the mid-short and impeding anomalies are not obvious and most trend anomalies are still standing after the earthquake,which indicates occurring of Wusu MS5.1 earthquake doesn't relieve the earthquake risk in northern Tianshan Mountain area.
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