摘要
利用Sentinel-1卫星提供的多个轨道SAR数据对2017-11-12伊拉克MW7.3地震进行研究,通过处理不同轨道数据并比较,获取震区可靠的同震形变场。利用降轨同震形变场,采用数据分辨率约束的四叉树方法降采样后作为约束条件,基于弹性半空间模型(Okada)反演断层几何参数及滑动分布。结果表明,本次地震位于扎格罗斯褶皱冲断带,产生的破裂带长度为44.5km、宽度为16.1km;发震机制为走滑逆冲断层,断层滑动角为140.68°,倾角为8°,最大滑动量为3.83m,地震造成视线向最大抬升和最大下沉为50cm和40cm;此次地震震源深度为15.5km,累计释放地震矩0.97×10^20Nm。
First,using the multiple orbital SAR data provided by Sentinel-1 satellite,we obtain the co-seismic deformation.Second,the quad-tree with data resolution constraint is used as the constraint condition for the coseismic deformation field of November 12,2017,M W7.3 Iraq earthquake.We develop the format conversion module based on the Okada model.Inversion results show that the earthquake is located in Zagros fold and thrust belt,in which the length of the rupture zone is 44.5 km and the width is 16.1 km.The occurring mechanism of strong earthquakes is strike slip-thrust faults in which the slip angle is 140.68°,the dip angle is 8°,and the maximum slip is 3.83 m.The earthquake caused ground displacements with maximum unlift and subsidence of 50 cm and 40 cm in the satellite line of sight respectively.The depth of this earthquake is 15.5 km,with the total moment of seismic release is 0.97×10^20 Nm.
作者
周传义
刘国林
陈洋
王珂
ZHOU Chuanyi;LIU Guolin;CHEN Yang;WANG Ke(College of Geomatics,Shandong University of Science and Technology,579 Qianwangang Road,Qingdao 266590,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2019年第6期577-582,共6页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(41274007,41404003)~~
