基于SBAS-InSAR的红河断裂带南段形变特征研究

Deformation characteristics of south branch of Honghe fault zone based on SBAS-InSAR

红河断裂带是一条历史悠久的大型走滑断裂,对云南地区的构造活动具有重要的控制作用。文中以红河断裂元阳段为研究区,利用2015—2017年的Sentinel-1A降轨数据,采取短基线集(SBAS-InSAR)技术进行数据处理,获取LOS向形变速率。分析发现,断裂带近场形变特征北盘为隆升,南盘为沉降,其运动速率分别为3.06~5.42mm/a和-5.38^-3mm/a,两盘运动速率差约为8mm/a,平均形变速率为4mm/a。

The Honghe fault zone is a large-scale large-scale strike-slip fault and plays an important role in controlling tectonic activities in Yunnan.In this paper,the Yuanyang section of the Honghe fault is taken as the study area.The data of the Sentinel-1A descending from 2015 to 2017 is taken and the LOS deformation rate is obtained by using the short baseline set(SBAS-InSAR)technique.The analysis shows that the near-field deformation features of the fault zone are uplifted in the north plate and subsidence in the south plate,with the moving velocities of 3.06~5.42 mm/a and-5.38~3 mm/a respectively,and the difference of the two plates'moving velocity is about 8 mm/a,with the average deformation rate of 4 mm/a.