基于PS-InSAR技术的断裂带地壳形变实验研究

An Experimental Study of Monitoring Fault Crustal Deformation Using PS-InSAR Technology

PS-InSAR技术克服了常规D-InSAR技术的空间、时间失相干和大气相位延迟等影响,对高相干点的差分干涉相位采用二维线性(或非线性)回归分析模型获取微小形变。概述PS-InSAR技术的相位组成、技术处理流程,以位于祁连山海原断裂带北盘的海原县为实验区,采用2003—2009年的21景ENVISAT ASAR数据,以GAMMA软件IPTA模块为软件平台处理得出实验区位移速率为-7～-9 mm/a,运动方向为自东向西,断裂带表现为左旋走滑,实验结果与GPS、库仑应力和地质学方法结果有较好的一致性。

PS-InSAR can get small deformation value of experimental area using two-dimensional linear（nonlinear） phase regression analysis model of high phase-coherent point differential interference phase.PS-InSAR avoids some phase error such as the phase decorrelations in time and space and atmospheric phase delay of D-InSAR.We introduce PS-InSAR phase composition,technology processing.And we take Haiyuan fault zone as experimental area（selecting a small area in Haiyuan fault）and use 21 scenes of ENVISAT ASAR data from 2003 to 2009.We apply IPTA module in GAMMA software and get deformation rate about-7^-9 mm/a in Haiyuan county of Haiyuan fault north plate.Movement direction is from east to west and display a left lateral slip fault is displayed.The experiment results compared with GPS and geological investigations results by other scholars are in good agreement.