ABSTRACT The first application of GaoFen-3 synthetic aperture radar (SAR) interferometry to monitoring co-seismic deformation of an earthquake is presented in this paper. First, two GaoFen-3 SAR images spanning the 2017 surface-wave magnitude ( ) 7.0 Jiuzhaigou earthquake were mosaicked, coregistered and processed into an interferogram with visible fringes. After the removal of severe orbital errors and unwrapping, the co-seismic deformation field is obtained. Finally, the fault parameters and slip distribution are determined based on the deformation field. To evaluate the performance of GaoFen-3 in this case, the interferogram, co-seismic deformation field, derived fault parameters and slip distribution are compared with those derived from Radarsat-2, Sentinel-1A and Advanced Land Observing Satellite-2 (ALOS-2) Phased Array type L-band Synthetic Aperture Radar-2 (PALSAR-2). The comparisons between the deformation field obtained from GaoFen-3 and those obtained from Radarsat-2 and Sentinel-1A show Pearson’s correlation coefficient ( ) values 90%, demonstrating that GaoFen-3 interferometry can measure the co-seismic deformation effectively. The resultant slip model obtained by GaoFen-3 interferometric measurements shows a simple, elliptical pattern of slip, reaching a maximum of approximately 1 m at depths of 10–13 km. The rake angle is almost , which suggests left-lateral strike-slip motion, consistent with previous studies.

中文翻译：

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高分三号干涉仪观测到的2017年M s 7.0九寨沟地震同震变形

摘要 本文介绍了高分三号合成孔径雷达（SAR）干涉测量技术在地震同震变形监测中的首次应用。首先，将跨越 2017 年面波震级 ( ) 7.0 级九寨沟地震的两幅高分 3 SAR 图像镶嵌、配准并处理成具有可见条纹的干涉图。去除严重的轨道误差并展开后，得到同震变形场。最后，根据变形场确定断层参数和滑移分布。为了评估高分三号在这种情况下的性能，将干涉图、同震变形场、推导的断层参数和滑动分布与雷达卫星二号推导的进行比较，Sentinel-1A 和高级陆地观测卫星 2 (ALOS-2) 相控阵型 L 波段合成孔径雷达 2 (PALSAR-2)。高分三号与雷达卫星二号和哨兵一号的变形场对比显示，Pearson相关系数( )为90%，表明高分三号干涉仪可以有效地测量同震变形。GaoFen-3 干涉测量获得的最终滑移模型显示了一个简单的椭圆形滑移模式，在 10-13 公里的深度达到最大约 1 m。前角几乎为 ，这表明左横向走滑运动，与先前的研究一致。高分三号与雷达卫星二号和哨兵一号的变形场对比显示，Pearson相关系数( )为90%，表明高分三号干涉仪可以有效地测量同震变形。GaoFen-3 干涉测量获得的最终滑移模型显示了一个简单的椭圆形滑移模式，在 10-13 公里的深度达到最大约 1 m。前角几乎为 ，这表明左横向走滑运动，与先前的研究一致。高分三号与雷达卫星二号和哨兵一号的变形场对比显示，Pearson相关系数( )为90%，表明高分三号干涉仪可以有效地测量同震变形。GaoFen-3 干涉测量获得的最终滑移模型显示了一个简单的椭圆形滑移模式，在 10-13 公里的深度达到最大约 1 m。前角几乎为 ，这表明左横向走滑运动，与先前的研究一致。在 10-13 公里的深度达到最大约 1 m。前角几乎为 ，这表明左横向走滑运动，与先前的研究一致。在 10-13 公里的深度达到最大约 1 m。前角几乎为 ，这表明左横向走滑运动，与先前的研究一致。