测绘学报 ›› 2019, Vol. 48 ›› Issue (3): 339-351.doi: 10.11947/j.AGCS.2019.20170671

• 摄影测量学与遥感 • 上一篇    下一篇

哨兵-2号光学影像地表形变监测:以2016年MW7.8新西兰凯库拉地震为例

贺礼家1, 冯光财1, 冯志雄1, 高华2   

  1. 1. 中南大学地球科学与信息物理学院雷达遥感研究室, 湖南 长沙 410083;
    2. 东华理工大学测绘工程学院, 江西 南昌 330013
  • 收稿日期:2017-11-27 修回日期:2018-10-18 出版日期:2019-03-20 发布日期:2019-04-10
  • 通讯作者: 冯光财 E-mail:fredgps@csu.edu.cn
  • 作者简介:贺礼家(1994-),男,硕士生,研究方向为地震形变监测与震源参数反演。E-mail:helijia@csu.edu.cn
  • 基金资助:
    国家自然科学基金(41574005);中南大学升华育英计划基金

Coseismic displacements of 2016 MW7.8 Kaikoura, New Zealand earthquake, using Sentinel-2 optical images

HE Lijia1, FENG Guangcai1, FENG Zhixiong1, GAO Hua2   

  1. 1. Laboratory of Radar Remote Sensing, School of Geoscience and Info-Physics, Central South University, Changsha 410083, China;
    2. Faculty of Geomatics, East China University of Technology, Nanchang 330013, China
  • Received:2017-11-27 Revised:2018-10-18 Online:2019-03-20 Published:2019-04-10
  • Supported by:
    The National Natural Science Foundation of China (No. 41574005);The Shenghua Yuying fund of Central South University

摘要: 光学影像已经广泛地应用于地表形变监测研究。哨兵-2号光学影像作为一种新的对地观测数据,具有重访周期短、空间分辨率高、影像覆盖范围大以及数据免费等优点,因此该数据在地表形变监测上有广泛的应用潜力。本文以COSI-Corr软件包为数据处理平台,基于亚像素的频率域相关性匹配技术,处理多时相的哨兵-2号数据获取地表形变。本文选取2016年Mw7.8新西兰凯库拉(Kaikoura)地震覆盖区域为例,对哨兵-2号影像地表形变中存在的各种系统误差源进行了系统分析和改正,并提出了改进的均值相减法去除形变场中的卫星姿态角误差。另外,还对哨兵-2号4个10 m空间分辨率的波段(Band 2/3/4/8)中可用于地表形变监测的最佳波段进行了分析,统计结果显示Band8的地表形变监测效果最好。最后,利用哨兵-2号光学影像获取了2016年11月14日Mw7.8新西兰凯库拉地震的同震形变场;分析了沿地震主要断层的滑移分布,结果表明最大水平滑移量达10 m;并与同期Landsat8全色影像的同震形变监测结果进行对比分析,结果表明哨兵-2号结果精度更高。本文的研究成果可以为哨兵-2号光学影像的应用提供参考。

关键词: 光学影像, 哨兵-2号, 新西兰凯库拉地震, 同震形变

Abstract: Optical imagery has been widely applied to monitor the earth surface changes. Sentinel-2 satellite constellation launched lately, provides optical images with short revisit cycle, high spatial resolution, large coverage and free accessibility. Thus it has great potential in surface deformation mornitoring. Based on the coregistration of optically sensed images and correlation (COSI-Corr) software package, we obtained the ground deformation field of the 2016 MW7.8 Kaikoura, New Zealand Earthquake from the multi-temporal Sentinel-2 data, using the sub-pixel cross-correlation technique. We systematically analyzed the system error sources of Sentinel-2 image pairs and proposed a modified subtraction method to mitigate the satellite attitude jitter distortions in the deformation field. Then, we compared the results of four bands(Band 2/3/4/8)with the spatial resolution of 10-meter and the statistic results show that Band8 is the optimum band for ground deformation monitoring. Moreover, we mapped the coseismic displacement field of the earthquake from Sentinel-2 optical images, and analyzed the slip distribution along the major faults. The results indicate that the maximum horizontal slip is up to 10 meters. For accuracy evaluation, we also calculated the coseismic displacement field of this event using the Landsat8 panchromatic images. The results indicate that Sentinel-2 has higher precision for the ground deformations monitoring. This research provides a good reference for the application of the Sentinel-2 optical images in future.

Key words: optical imagery, Sentinel-2, New Zealand Kaikoura earthquake, coseismic displacements

中图分类号: