| 基于光学遥感影像的2019年加利福尼亚MW7.1和MW6.4双震同震形变测量 |
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| 引用本文： | 傅志豪,王鑫,张景发.基于光学遥感影像的2019年加利福尼亚MW7.1和MW6.4双震同震形变测量[J].大地测量与地球动力学,2021,41(5):506-510. |
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| 作者姓名： | 傅志豪 王鑫 张景发 |
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| 作者单位： | 应急管理部国家自然灾害防治研究院,北京安宁庄路1号,100085 |
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| 摘 要： | 利用地震前后的Landsat-8和Sentinel-2光学遥感影像数据，基于频率域互相关算法提取加利福尼亚州MW7.1及MW6.4地震的同震形变场，同时针对形变数据易受轨道误差、条带误差及时间失相干的影响，分别采用最小二乘多项式曲线拟合、改进均值相减等方法去除系统误差项。研究表明，MW7.1主震以右旋走滑为主，地表形变的断层迹线呈NNW走向，长度达55 km，最大滑移量约为2.82 m；MW6.4地震的发震断层迹线呈NE走向，长度达15 km，最大滑移量约为1.05 m，推测2次地震的发震断层分别为NNW向右旋走滑断裂及NE向左旋走滑断裂，二者形成典型的共轭关系。
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| 关 键 词： | 光学遥感影像 加利福尼亚州地震 同震形变场 |
Co-Seismic Deformation Measurement of 2019 Mw6.4 and Mw7.1 California Earthquakes Base on Optical Remote Sensing Images |
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| FU Zhihao,WANG Xin,ZHANG Jingfa.Co-Seismic Deformation Measurement of 2019 Mw6.4 and Mw7.1 California Earthquakes Base on Optical Remote Sensing Images[J].Journal of Geodesy and Geodynamics,2021,41(5):506-510. |
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| Authors: | FU Zhihao WANG Xin ZHANG Jingfa |
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| Abstract: | The co-seismic deformation field of the MW7.1 and MW6.4 earthquakes in California is extracted using the frequency domain cross-correlation algorithm based on the Landsat-8 and Sentinel-2 optical images.At the same time, we use some error processing algorithms, such as the least square polynomial fit, the method of improved mean subtraction, and so on, to reduce the system errors often caused by orbit error, banding error and temporal decorrelation. The results show that the maximum slippage of the fault trajectory caused by the MW6.4 foreshock is 1.05 m and the surface rupture trajectory is 15 km while the maximum surface slippage of MW7.1 main shocks reaches 2.82 m and the surface fault trajectory is 55 km. We speculate that the two earthquakes formed a typical conjugate characteristic, which is controlled by NNW and NE strike-slip faults. |
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| Keywords: | optical remote sensing image California earthquakes co-seismic deformation field |
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