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| 2016年新疆阿克陶地震Sentinel-1 InSAR同震形变特征 | |
| 引用本文： | 宋瑞庆,孟国杰,张奎,董彦芳,龚发明.2016年新疆阿克陶地震Sentinel-1 InSAR同震形变特征[J].地震,2018,38(1):17-25. |
| 作者姓名： | 宋瑞庆 孟国杰 张奎 董彦芳 龚发明 |
| 作者单位： | 1.中国地震局地震预测重点实验室地震预测研究所, 北京 100036; 2.重庆大学通信工程学院, 重庆 400044 |
| 基金项目： | 国家自然科学基金(41461164004, 41404027, 41304002);国家国际科技合作专项项目(2015DFR21100) |
| 摘 要： | 2016年11月25日新疆克孜勒苏州阿克陶县发生MW6.6地震。 本文利用合成孔径雷达差分干涉测量技术, 对Sentinel-1卫星获取的升、 降轨雷达数据进行了处理, 提取了该次地震的同震形变场, 并结合形变场特征与震源机制解, 采用梯度下降法反演发震断层的滑动分布。 结果表明, 升、 降轨LOS向同震形变场在发震断层两侧具有明显不同的形变特征, 主要形变区域分布在断层两侧, 升轨LOS向形变量可达-8.2 cm与11.2 cm, 降轨LOS向形变量可达-21.4 cm与13.1 cm; 反演的升、 降轨干涉形变场与InSAR测量值之间的残差得到有效控制, 大部分的残差介于±5 cm之间; 断层滑动分布主要集中于沿断层面深约2~18 km处, 最大滑动量位于沿断层面深约7 km处可达0.96 m; 平均滑动角约182.29°, 最大滑动处的滑动角约197.13°, 两个滑动分布中心的滑动角均接近180°, 表明阿克陶地震为一典型的右旋走滑破裂性事件; 当剪切模量取32 Gpa时, 反演的发震断层地震矩M0可达9.75×1018, 相当于矩震级MW6.60, 与地震波形反演结果一致。 |
| 关 键 词： | InSAR 同震形变场 Sentinel-1卫星 2016年阿克陶地震 |
| 收稿时间： | 2017-05-08 |
InSAR Co-seismic Deformation Characteristics of the 2016 Aketao Earthquake using Sentinel-1 Data |
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| SONG Rui-qing,MENG Guo-jie,ZHANG Kui,DONG Yan-fang,GONG Fa-ming.InSAR Co-seismic Deformation Characteristics of the 2016 Aketao Earthquake using Sentinel-1 Data[J].Earthquake,2018,38(1):17-25. | |
| Authors: | SONG Rui-qing MENG Guo-jie ZHANG Kui DONG Yan-fang GONG Fa-ming |
| Institution: | 1.Key Laboratory of Earthquake Prediction, Institute of Earthquake Science, CEA, Beijing 100036, China; 2.College of Communication Engineering, Chongqing University, Chongqing 400044, China |
| Abstract: | An MW6.6 earthquake occurred on November 25, 2016 in Aketao, Xinjang region. By utilizing differential interferometric synthetic aperture radar technique, we retrieved co-seismic deformation field of the Aketao earthquake through processing the ascending and descending data obtained from Sentinel-1. Besides, with the combination of deformation field features and focal mechanism solution, we inverted effectively the seismic slip distribution using steepest descent method. The results demonstrate that the ascending and the descending LOS co-seismic deformation fields have distinct characteristics on both sides of the seismogenic fault. The ascending LOS displacement is -8.2 cm and 11.2 cm, and the descending LOS displacement is -21.4 cm and 13.1 cm. The residuals between the inversed ascending/descending deformation and the InSAR measurements are effectively controlled. Most residuals are within -5 cm to 5 cm. Slips are mainly distributed 2~18 km beneath the fault plane. The maximum slip is about 0.96 m, which is located 7 km beneath the fault plane. The average slip angle is about 182.29°. The maximum slip angle is about 197.13°. The slip angle of two sliding distribution centers is close to 180°, indicating that the Aketao earthquake is a typical dextral strike-slip rupture event. When the shear modulus is set to 32 Gpa, the seismic moment M0 of the inversed seismogenic fault is up to 9.75×1018, which is equivalent to moment magnitude MW6.6 and is mostly identical to the focal mechanism solution. |
| Keywords: | InSAR Co-seismic deformation field Sentinel-1 The Aketao earthquake |
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