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Investigation and Mechanism Study of Deformation Anomaly of Xiaguan Fault Site in Northwest Yunnan Province

LI Layue;BO Wanju;CHEN Zongshi;SHAO Desheng;LU Mingyong;WANG Xiaoqiang;The First Monitoring and Application Center,CEA;The Second Monitoring and Application Center,CEA;Yunnan Earthquake Agency;National Earthquake Response Support Service;Earthquake Agency of Xinjiang Uygur Autonomous Region;  
In this paper,on-the-spot investigation and inspection is carried out for the fault deformation anomaly on Xiaguan site,northwest Yunnan province,and the original observation curves are analyzed.Furthermore,the accumulation of 3parameters:the relatively horizontal torsion,the relatively horizontal movement and the relatively vertical variation of the fault,are calculated respectively;and the mechanism of deformation anomalies is discussed.The results are:(1)the observation position of the Xiaguan site is stable,the observation environment is good,there is no artificial disturbance or interference phenomenon,and the observation data is continuous and reliable;(2)the crossfault observation of the Xiaguan site shows the fault has been being active as a right lateral slip,which has been enhanced recently;(3)there is a corresponding relationship between the abnormal compressional fluctuation of the fault deformation and strong earthquakes in the surrounding area;(4)the accumulation of horizontal compressional deformation from baselines across the fault shows that there is constant surface tensional fault activity.The accumulation of relative vertical deformation of the fault from leveling shows that the fault has a persistence of compressional fault(inverse)activities,and both can be explained under the mechanism of unity,which is of important reference value to explain the large number of contradictory phenomena in the observation of the cross-fault site.
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