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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
投稿时间:2017-02-09  修订日期:2017-03-31  点此下载全文
引用本文:周振凯,姚鑫.2018.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,92(2):232-243
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作者单位E-mail
周振凯 国土资源部新构造运动与地质灾害重点实验室中国地质科学院地质力学研究所北京100086 zzk114043@163.com 
姚鑫 国土资源部新构造运动与地质灾害重点实验室中国地质科学院地质力学研究所北京100086 yaoxinphd@163.com 
基金项目:(编号:41672359);中国地质调查局工作项目(编号:DD20160272)资助成果
中文摘要:采用基于Sentinel 1 SAR数据的InSAR技术,对2016年11月25日西昆仑Mw66地震从两个角度进行了变形观测,结合构造背景的约束,计算得到了厘米级精度的同震三维变形场,并通过与震源机制解和地表破裂的对比验证了准确性。InSAR变形场为该区同震变形和长期构造活动提供了新的认识:①同震变形特征差异显示发震断裂沿西昆仑山南麓展布,走向104°,长度70 km,倾向SSE,运动性质为正断滑脱为主兼右旋走滑;②同震变形分布范围为100 km长×60 km宽椭圆形区域,呈现多中心、多方向变形,上盘以下沉为主,最大下沉量10~15 cm,水平变形2~6 cm,下盘水平运动占主导,滑动量8~14 cm为主,垂直变形仅-3~1 cm,上下盘整体的垂直变形呈现张压四象限特征,符合走滑剪切作用的结果;③地震同震变形具有弹性回跳为主导的变形模式,地区的总体隆升和向北楔入是在长期的区域构造应力场驱动下形成,而局部的特征构造地貌,如断陷盆地和地表破裂,则是同震快速弹性回跳作用的结果;④帕米尔高原东北缘长期隆升和本次地震以正断滑脱为主的构造变形现象印证了木吉盆地(也就是公格尔拉张系)的“同造山拉张”成因模型,而不是喀喇昆仑断裂活动NW向延伸作用的结果。
中文关键词:地震  同震变形  InSAR  帕米尔  公格尔拉张系  木吉断裂
 
Tectonic Deformation Study of Nov25, 2016 Mw 6.6 Earthquake in West Kunlun Mountain Based on InSAR Technology
NameInstitution
ZHOU ZhenkaiKey Laboratory of Neotectonic Movement and Geohazards, Ministry of Land and Resource,Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100086
YAO XinKey Laboratory of Neotectonic Movement and Geohazards, Ministry of Land and Resource,Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100086
Abstract:The deformation of Mw 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. ②The 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.
keywords:Earthquake  Coseismic deformation  InSAR  Pamir  Kongur extension  Muji Fault
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