地质学报2018，Vol.92Issue(2)：232-243,12.
基于InSAR技术的2016年11月25日西昆仑Mw6.6地震构造变形研究
Tectonic Deformation Study of Nov.25, 2016 Mw 6.6 Earthquake in West Kunlun Mountain Based on InSAR Technology
摘要
Abstract
The deformation of Mw 6.6 Earthquake on Nov.25,2016 in West Kunlun Mountain was observed from two directions using by Sentinel-1 SAR data-based InSAR technology.Based on the tectonic background,this study obtained a centimeter-scale 3D deformation field and then verified its accuracy through comparison with surface ruptures and focal mechanism of this earthquake.InSAR-based deformation field provides some recognition for the co-seismic deformation and neo-tectonic movement patterns.①The differences of co-seismic deformation manifests the extension of seismogenic fault along the piedmont of West Kunlun mountain,striking 104°,70km long and dipping SSE,which are characterized by mainly normal slip with dextral strike-slip.② The co-seismic deformation covers an elliptic area of about 100 km long and 60 km wide,showing multiple centers and multiple directions,with hanging wall subsiding 10～15 cm,horizontal sliding 2～6 cm,and footwall sliding 8～14 cm and vertical deformation of only-3～1cm.Vertical deformation of hanging wall and footwall presents tensile features of four quadrants,in agreement with results of strike-slip shearing.③Co-seismic deformation is dominated by mode of elastic rebound,that is,the long-term tectonic stress was the driver for uplifting and northward intrusion of this region,while the local geomorphologies,i.e.surface rupture and graben basin,were the result of elastic rebound.④The persistent uplift in the NE margin of Pamir plateau and structural deformation of normal faulting by this earthquake has confirmed the synorogenic extension model of the Muji basin (i.e.Kougur extension),rather than the result of NW-trending extension of right-slip Karakoram faulting activity.关键词
地震/同震变形/InSAR/帕米尔/公格尔拉张系/木吉断裂Key words
Earthquake/Coseismic deformation/InSAR/Pamir/Kongur extension/Muji Fault引用本文复制引用
周振凯,姚鑫..基于InSAR技术的2016年11月25日西昆仑Mw6.6地震构造变形研究[J].地质学报,2018,92(2):232-243,12.基金项目
本文为自然科学基金项目(编号41672359) （编号41672359）
中国地质调查局工作项目(编号DD20179282)资助成果. （编号DD20179282）
