基于GNSS的日本熊本地震前电离层异常研究  

Ionospheric Anomalies Preceding Kumamoto Earthquake Detected by GNSS

作　　者：周长志[1] 张珂[1] 张海平[1] 高士民[1] 陈钰[1] 

机构地区：[1]山东省国土测绘院,济南250102

出　　处：《全球定位系统》2016年第5期18-22,27,共6页Gnss World of China

摘　　要：2016年4月16日日本熊本发生Mw7.0地震,为了研究地震前孕震区的电离层异常。采用欧洲定轨中心提供的全球电离层图(GIM)与gmsd、smst测站的观测数据分析了孕震区的电离层变化情况。在排除了太阳与地磁活动造成的干扰之后,结果发现,在熊本地震前1天,孕震区内电离层电子含量显著下降,幅度达-8TECU;同时全球TEC异常分布图显示,该天地震影响范围内有明显TEC负异常出现,异常主要出现在震中的北部和东南部区域,持续约12h,这可能是熊本地震的电离层前兆之一。On April 16,2016,the Mw7.0Kumamoto earthquake abruptly shocked in Japan.In order to analyze the ionospheric variations in earthquake preparation area before the great earthquake,the GIM（global ionosphere map）supplied by the Center for Orbit Determination in Europe and the observation data of gmsd and smst stations were utilized.Considering the ionospheric disturbances caused by solar-terrestrial environment,the results indicated the total electron content decreased sharply in the 1st day before Kumamoto earthquake,the amplitude was about-8 TECU.In addition,the distribution of global TEC anomalies showed obvious negative TEC anomalies appeared in the seismogenic zone,and most of TEC anomalies were distributed in the northern and southeast regions of Kumamoto earthquake,the duration of TEC anomalies was approximately 12 hours,which may be the ionospheric precursors of Kumamoto earthquake.

关 键 词：熊本地震 电离层异常 GNSS 日地环境 

分 类 号：P228[天文地球—大地测量学与测量工程]