运用时序InSAR技术监测合肥市地面沉降及断裂活动

Monitoring Land Subsidence and Fault Activity in Hefei City Based on MT-InSAR

基于覆盖合肥地区的24景Sentinel-1A数据,采用PS-InSAR和SBAS-InSAR时序处理方法获取2017-11~2019-10合肥市城区及周边地面形变分布信息,分析主城区地面沉降的时空演化规律,获取地铁网络沿线地表形变空间分布图。结果表明,合肥市地铁线路沿线发生不同程度形变,形变严重区域主要集中在西部及西南部,最大沉降速率达到35 mm/a。对池河-西山驿断裂形变场进行宏观分析,并结合时空同步的跨断层水准数据进行对比验证,认为2种数据的垂直形变监测结果具有一致性,推测数据的垂直升降变化可能受断层拉张和挤压交替控制。

Based on 24 scenes Sentinel-1A data covering the Hefei area,we use PS-InSAR and SBAS-InSAR time series processing methods to obtain the land deformation distribution information of Hefei city from 2017-11 to 2019-10.We analyze the temporal and spatial evolution law of land subsidence in the main urban area.At the same time,we obtain the spatial distribution of ground deformation along Hefei metro network.The results show that there are different degrees of deformation along the subway line,and the stations with serious deformation are mainly concentrated in the western and southwest regions,where the maximum subsidence rate reaches 35 mm/a.We carry out deformation field analysis of Chihe-Xishanyi fault,and the cross fault leveling data with space-time synchronization are compared and verified.The analysis shows that the vertical deformation monitoring results of the two kinds of data have certain consistency,and the vertical rise and fall of the data may be controlled alternately by fault tension and compression.