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Title:: Deformation Anomaly of Some Continuous GPS Sites and its Seismic Hazard Analysis in Sichuan-Yunnan Region

Author(s):: ZHOU Haitao; CHEN Zhaohui; ZHU Shuang; ZHOU Wei; SHEN Xiaoqi; First Crust Deformation Monitoring and Application Center,CEA,Tianjin 300180,China

Keywords:: continuous GPS sites; cross-fault leveling; seismic activity; Sichuan-Yunnan region

摘要:: 通过对川滇地区连续GPS测点进行分析,发现在宁南地区存在一定的形变异常,而跨断层水准资料也显示有同样的异常。安宁河断裂、则木河断裂周边连续GPS测点运动速率相对于小江断裂北段有一定的差异。综合分析宁南地区及其周边地区的跨断层水准测线、连续GPS测点运动差异、历史地震活动性、b值、重力场变化特征等资料,认为在宁南及其周边地区可能存在一定的应力积累,在则木河断裂与小江断裂交汇部位及其南部可能存在一定的应力积累。

Abstract:: Analyzing the continuous GPS stations in Sichuan-Yunnan region,we found that there exits some abnormal deformation in the southern area of Ningnan,and the cross-fault leveling data also showed abnormal deformation.We compared and found that the continuous GPS stations motion rate in the surrounding area of Anninghe Fault,Zemuhe Fault has some difference than that in the north segment of Xiaojiang Fault.Comprehensive analysis on cross fault leveling measuring line,GPS continuous station,seismic activity,and gravity field variation,etc.in Ningnan and its surrounding area was made.We obtained that there may exit some stress accumulation in the study area,and the seismic hazard at the intersection area of Zemuhe Fault and Xiaojiang Fault and it's southern area should be noticed.