Sentinel-1A数据的四川宜宾Ms6.0同震形变分析

为了获取2019年6月17日发生的四川宜宾Ms6.0地震引起的地表形变情况,该文利用欧空局宽幅模式的高分辨率新型Sentinel-1A卫星获取了此次地震的第一对同震干涉像对数据,使用D-InSAR技术获取宜宾市长宁县地区的同震形变场。结果显示,本次地震在震中西北方向分别形成了1个明显的沉降区和抬升区,在雷达视线方向上的最大沉降量为7.9 cm,最大抬升量为8.1 cm。通过与同一时间内的GPS高程测量形变量相比,D-InSAR解算的地表形变量与GPS监测点形变量基本一致,均不超过3 mm,表明了本文的D-InSAR形变解算结果的可靠性,体现了新型Sentinel-1A雷达卫星在地震形变监测领域有着很高的应用价值和潜力。

Analysis of co-seismic deformation of Sichuan Yibin Ms6.0 based on Sentinel-1A data

In order to obtain the surface deformation caused by the Sichuan Yibin Ms6.0 earthquake on June 17,2019,this paper used the new high-resolution Sentinel-1 A satellite of the ESA wide-width model of co-seismic interference image pair data to obtain the co-seismic deformation field in the Changning county area of Yibin city by using D-InSAR technology.The results showed that the earthquake formed an obvious subsidence area and uplift area in the northwest direction of epicenter.The maximum subsidence in the direction of radar line of sight was 7.9 cm,and the maximum uplift was 8.1 cm.Compared with the GPS elevation measurement deformation at the same time,the D-InSAR solution surface deformation was almostly the same as the GPS monitoring point deformation,which was no more than 3 mm.Which indicated that the D-InSAR result of deformation calculation was reliable,and also reflected the high application value and potential of the new Sentinel-1 A radar satellite in the field of seismic deformation monitoring.