基于SST背景场的2016年中国台湾新北邻近海域6.2级地震卫星热红外异常研究
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  • 英文篇名:Thermal infrared anomalies of satellite in Taiwan, Xinbei's M_S 6.2 earthquake based on SST background field
  • 作者:袁媛 ; 尹京苑 ; 李成范 ; 宋阳 ; 周时强 ; 赵俊娟 ; 孙宪坤 ; 方国庆
  • 英文作者:YUAN Yuan;YIN Jing-yuan;LI Cheng-fan;SONG Yang;ZHOU Shi-qiang;ZHAO Jun-juan;SUN Xian-kun;FANG Guo-qing;Shanghai Earthquake Agency;School of Computer Engineering and Science,Shanghai University;School of Electronic and Electrical Engineering,Shanghai University of Engineering Science;
  • 关键词:SST背景场 ; 卫星遥感 ; 中分辨率成像光谱仪(MODIS) ; 热红外异常 ; 新北邻近海域M_S ; 6.2地震
  • 英文关键词:SST background field;;Satellite remote sensing;;Moderate Resolution Imaging Spectroradiometer(MODIS);;Thermal infrared anomalies;;Xinbei M_S 6.2 earthquake in adjacent sea of China
  • 中文刊名:DQWJ
  • 英文刊名:Progress in Geophysics
  • 机构:上海市地震局;上海大学计算机工程与科学学院;上海工程技术大学电子电气工程学院;
  • 出版日期:2018-07-25 14:12
  • 出版单位:地球物理学进展
  • 年:2019
  • 期:v.34;No.154
  • 基金:上海市科技委员会专项(16dz1206000);; 中国地震局地震科技星火攻关项目(XH15016)联合资助
  • 语种:中文;
  • 页:DQWJ201902011
  • 页数:9
  • CN:02
  • ISSN:11-2982/P
  • 分类号:90-98
摘要
本文以2016年5月31日中国台湾新北海域M_S 6.2级地震为例,基于2013—2016年的中分辨率成像光谱仪(MODIS)热红外卫星遥感数据,构建了震中附近海域的历年同期SST月背景场和季背景场.应用小波变换和计算相对功率谱提取了震前海域的热红外异常特征,并对其时空演变特征进行了分析.随后,从海域地震特点、海域地震历年SST背景场同化等问题进行了探讨.研究结果表明,此次海域地震热红外异常主要以连片状形式出现,增温异常大体上经历了无增温—微弱、分散增温—连片增温—增温幅度最大—消退几个阶段;震前6 d增温异常达到了最大范围和最大幅度,增温幅度最大值出现在热红外异常集中区域的边缘地区,在震后15 d内热红外增温异常现象逐渐消失;此外,热红外异常变化与区域的平均功率谱相对值有着很好的对应关系,异常区域的最大平均谱值幅度达到12倍,也为后续利用卫星热红外异常来识别海域地震提供了参考依据.
        Taking the Taiwan, Xinbei's M_S 6.2 earthquake on May 31, 2016, this paper collected Moderate Resolution Imaging Spectroradiometer(MODIS) thermal infrared satellite remote sensing data from 2013 to 2016 and constructed the monthly and quarterly SST background fields over the same period of the study area. Subsequently, the thermal infrared anomaly characteristics of the Xinbei's M_S 6.2 earthquake were extracted by using wavelet transform and calculating the relative power. At last, the aspects of seismic features in adjacent sea of China, assimilation of SST background fields over the same period in the sea area were discussed. The research results showed that the thermal anomaly had obvious temporal and spatial characteristics:(1) The shape of the thermal infrared anomaly zone was irregular, which mostly appeared in the form of flakes. The change process of thermal anomaly was divided into several stages, which were non-warming to slightly warming、decentralized warming to consecutive warming、expanding to peak and then disappear.(2) The thermal anomaly reached the maximum range and amplitude at the sixth day before the earthquake and the epicenter was in the edge of anomaly area. The anomaly zone began to shank after the earthquake and completely disappeared in 15 days.(3) The thermal infrared anomaly of the study area had a good correspondence with the relative average power spectrum,the magnitude of the relative variation was 12 times more than usual. So the temporal and spatial characteristics could provide a reference for the utilize of satellite thermal infrared anomalies to identify earthquake in the sea.
引文
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