基于InSAR的某造山带断裂北段震间形变及闭锁状态研究  

Study on Seismic Deformation and Locking State of Northern Segment of Orogenic Belt Fault Based on InSAR

作　　者：姚智博 YAO Zhibo(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道勘察》2024年第6期24-30,共7页Railway Investigation and Surveying

基　　金：中铁二院工程集团有限责任公司科研计划重点课题(KDNQ231007)。

摘　　要：基于合成孔径雷达干涉测量技术(InSAR)来获取伊朗扎格罗斯造山带区域断层震间构造形变场,并通过将形变场分解分别得到平行断层走向及垂直地表方向形变速率场,依据形变监测结果选取18条剖面线,来精细揭示形变空间分布特征,再以形变数据作为约束,分别基于螺旋位错模型及负位错模型开展扎格罗斯断层西北段震间参数反演。结果表明,扎格罗斯断层及延伸断层整体呈右旋走滑趋势,上下盘最大形变差可达9.0~12.0 mm/a,区域垂直地表形变不显著,最大形变量<2.0 mm/a;剖面线结果显示,区域块体活跃性较强;震间参数反演结果表明,扎格罗斯断层西北区域内北段及中段滑动速率<2.0 mm/a,东南段大部分区域滑动速率>3.0 mm/a,西北段滑动速率为3.6 mm/a;闭锁状态表明,该区域内闭锁系数普遍>0.6,同时存在4处强闭锁区,存在较高的地震风险。The interseismic tectonic deformation field of faults in the Zagros orogenic belt was obtained based on interferometry synthetic aperture radar(InSAR)and the deformation field was decomposed by satellite spatial geometry.18 profiles were selected based on the results in order to finely reveal the spatial distribution characteristics of deformation,and deformation data was used as the constraints for the inversion of parameters of the northwest section of the Zagros respectively.Based on the screw model and dislocation model,the interseismic parameters of the northwest section of Zagros were presented.The results show that the Zagros Fault and its extensions have right-lateral slip trend,with a maximum deformation difference of 9.0~12.0 mm/a between the hangingwall and footwall,while the vertical surface deformation in the region is insignificant,with a maximum deformation of less than 2.0 mm/a.The results of the profiles show that the regional deformation has a large variation,and the block motion is active.Interseismic parameter inversion results show that the slip rate of the north and middle sections of the Zagros fault is less than 2.0 mm/a,the slip rate of the southeast section is more than 3.0 mm/a,and the slip rate of the northwest section is about 3.6 mm/a.The locking status shows that the locking coefficient of the Zagros fault is generally greater than 0.6,and there are four strong locking zones,which have a high seismic risk.

关 键 词：合成孔径雷达干涉测量 扎格罗斯断层 震间构造形变场 形变场分解 震间参数反演 

分 类 号：P258[天文地球—测绘科学与技术]