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| 利用考虑地形起伏的反演方法获取2017年伊拉克MW7.3地震的断层参数及滑动分布 | |
| 引用本文： | 余宏远,李伟,王文达.利用考虑地形起伏的反演方法获取2017年伊拉克MW7.3地震的断层参数及滑动分布[J].地震,2020,40(4):63-75. |
| 作者姓名： | 余宏远 李伟 王文达 |
| 作者单位： | 1.河西学院土木工程学院, 甘肃 张掖 734000; 2.兰州交通大学测绘与地理信息学院, 甘肃 兰州 730070; 3.地理国情监测技术应用国家地方联合工程研究中心, 甘肃 兰州 730070; 4.甘肃省地理国情监测工程实验室, 甘肃 兰州 730070 |
| 基金项目： | 河西学院横向项目(H2019037, H2018006, H2018004); 中国博士后科学基金(2019M660091XB); 甘肃省高等学校创新能力提升项目(2020A-037); 兰州交通大学青年科学研究基金(2019003); 兰州交通大学“天佑青年托举工程人才”项目 |
| 摘 要： | 2017年11月13日伊拉克北部地区苏莱曼尼亚省发生了MW7.3地震, 造成了重大的人员和经济损失。 本文利用升降轨的Sentinel-1和降轨的ALOS-2卫星的SAR数据, 通过差分干涉测量技术获取了该地震的同震形变场, 联合DInSAR和MAI技术, 采用抗差最小二乘法求解该地震的同震三维形变场。 基于改进的考虑地形起伏的均匀位错模型反演确定了发震断层的断层参数, 最后基于非均匀位错模型得到了发震断层的分布式滑动分布模型。 结果显示: ALOS-2卫星降轨轨道观测到的伊拉克地震引起的LOS向地表形变最大为55.8 cm抬升和47.9 cm下沉; Sentinel-1卫星观测到的伊拉克地震引起的LOS向地表形变为: 升轨轨道最大为87.9 cm抬升和17.1 cm下沉; 降轨轨道最大为55.6 cm抬升和38 cm下沉; 相对于前人的研究成果, 本文利用改进的考虑地形起伏的反演方法得到的发震断层几何参数表明发震断层为NNW走向, 倾向角为352°, 同震破裂以逆冲为主, 同时兼有一定的左旋走滑分量。 基于均匀位错模型反演得到的断层滑动分布结果表明, 同震破裂未延伸至地表, 主要滑动量集中在12~18 km, 最大滑动量位于15 km深度, 达到4.3m, 反演得到的矩震级为MW7.35, 与UGSG、 GCMT等机构给出的结果一致。 |
| 关 键 词： | 2017年伊拉克MW7.3地震 InSAR 同震形变 滑动分布 三维形变场 |
| 收稿时间： | 2019-10-13 |
The Fault Parameter and Slip Distribution of the 2017 Iraq MW7.3 Earthquake Based on the Improved Inversion Method Considering Topography |
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| YU Hong-yuan,LI Wei,WANG Wen-da.The Fault Parameter and Slip Distribution of the 2017 Iraq MW7.3 Earthquake Based on the Improved Inversion Method Considering Topography[J].Earthquake,2020,40(4):63-75. | |
| Authors: | YU Hong-yuan LI Wei WANG Wen-da |
| Institution: | 1. School of Civil Engineering, Hexi University, Zhangye 734000, China; 2. Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070; 3. National and Local Joint Engineering Research Center forGeographic Monitoring Technology Application, Lanzhou 730070; 4. Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou 730070 |
| Abstract: | On November 12, 2017, an MW7.3 earthquake struck Sulaimaniyah province in northern Iraq, causing heavy human and economic losses. In this paper, the co-seismic deformation field of the earthquake was obtained by differential interferometry using the ascending and descending synthetic aperture radar (SAR) data of Sentinel-1 and Alos-2 satellites, combining DInSAR and MAI technologies, the robust least-square method was used to solve the coseismic 3D deformation field of this earthquake. Based on the improved uniform dislocation model considering topography, the fault parameters of seismogenic faults were determined. Finally, the distributed slip distribution of seismogenic faults was obtained based on the non-uniform dislocation model. The results showed that the LOS deformations caused by the Iraq earthquake observed by the ALOS-2 satellite in descending orbit were a maximum of 55.8 cm uplift and 47.9 cm subsidence; the LOS deformations caused by the Iraq earthquake observed by the Sentinel-1 satellite: the maximum ascending orbit uplift of 87.9 cm and sinking of 17.1 cm; the maximum descending orbit of 55.6 cm uplift and 38cm sinking; Compared with the previous research results the geometric parameters of seismogenic faults obtained by the improved inversion method considering topography indicates that the seismogenic faults are NNW strikes. The strike azimuth angle is 352 °. The coseismic rupture is dominated by thrust and has a certain left-lateral strike-slip component. The fault slip distribution obtained from the inversion based on the uniform dislocation model shows that the coseismic rupture did not extend to the surface, the mainshock slip is concentrated at 12~18 km, and the maximum slip is at the depth of 15 km, reaching 4.3 m. The moment magnitude obtained by the inversion is MW7.35, consistent with the results given by the UGSG and GCMT. |
| Keywords: | 2017 Iraq MW7 3 earthquake InSAR Co-seismic deformation Slip distribution 3D deformation field |
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