摘要
合成孔径雷达干涉测量(InSAR)技术具有高空间分辨率、覆盖范围广等特点,但只能获取雷达视线向的地表形变信息,无法得到真实的三维地表形变量。GPS数据可以得到高精度的E、N、U方向位移,但只能在离散的站点测量,空间分辨率低。本文提出一种联合InSAR和GPS数据计算地表三维形变的方法,采用覆盖研究区域的Sentinel-1A影像,结合重复轨道差分干涉测量技术(D-InSAR)和GPS同震位移测量结果获取了2016年台湾高雄Mw6.7地震的高密度三维同震形变信息。结果表明,此次地震的最大形变中心约位于120.40°E、22.90°N,雷达视线向最大形变量约为15cm,同震形变以垂直和东西方向形变为主。联合InSAR和GPS数据能够很好地反演地震的同震形变场,对于其产生机理的研究和分析具有重要意义。
Synthetic Aperture Radar Interferometry(InSAR)technology has the characteristics of high spatial resolution and wide coverage,but it can only obtain the surface deformation in the radar line of sight,and cannot obtain the true three-dimensional surface deformation.GPS data can obtain highprecision displacements in the East,North,and Up directions,but it can only be surveyed at discrete sites and the spatial resolution is low.This paper proposes a method of combining InSAR and GPS data to calculate the three-dimensional surface deformation,so as to obtain high-density three-dimensional coseismic displacements of the Kaohsiung Mw6.7 earthquake.The results show that the maximum deformation center of this earthquake is at 120.40°E,22.90°N,which is about 15cm in the radar line of sight,and the coseismic deformation becomes dominant in the vertical and east-west directions.The combination of InSAR and GPS data can well invert the coseismic deformation field of an earthquake,which is of great significance for the research and analysis of earthquake mechanism.
作者
王月
伍吉仓
Wang Yue;Wu Jicang(College of Surveying and Geo-information,Tongji University,Shanghai 200092,China)
出处
《工程勘察》
2021年第10期59-63,共5页
Geotechnical Investigation & Surveying
