震前电离层TEC异常扰动的研究

¹武汉大学卫星导航定位技术研究中心,武汉市珞喻路129号,430079;²中国地震局地震研究所,武汉市洪山侧路40号,430071;³地壳运动与地球观测实验室,武汉市洪山侧路40号,430071

基金项目: 国家863计划资助项目(2007AA12Z169)；国家科技支撑计划资助项目(2008BAC35B02)；中国地震局地震研究所所长基金资助项目(IS2007614)

详细信息

Ionosphere TEC Anomalous Disturbance of Pre-seism

¹ Rearch Center of GNSS,Wuhan University,129 Luoyu Road,Wuhan 430079,China;² Institute of Seismology,CEA,40 Hongshance Road,Wuhan 430071,China;³ Crustal Movement Laboratory,40 Hongshance Road,Wuhan 430071,China

Funds: 国家863计划资助项目(2007AA12Z169)；国家科技支撑计划资助项目(2008BAC35B02)；中国地震局地震研究所所长基金资助项目(IS2007614)

摘要: 利用中国地壳运动观测网络基准站观测数据,计算了2008年3～8月期间的中国区域电离层电子总含量(totalelectron content,TEC),并根据CODE分析中心最终TEC数据,采用不同尺度的统计分析方法,对半年来四川地震上空TEC值进行检查。结果表明,在5.12汶川地震震前一个星期内,孕震区上空连续出现明显的电离层异常扰动(在一定的经度范围内),其电离层异常驼峰有向磁赤道漂移的趋势,并逐步完全消失;对于此后发生的大于Ms5.0的地震,75%的地震区域同样发生此类现象。
- 电离层 /
- 电子总含量(TEC) /
- 球谐模型 /
- 异常扰动 /
- 地震
Abstract: Using the observational data of fiducial station in the crustal movement observation network of China,the total electron content of Chinese region from March to August 2008 are calculated. Being assisted by the final TEC of CODE analysis center,adopting different scale statistical analysis method,we examined the TEC on sichuan earthquake. As a result,we found that the anomalous VTEC disturbances over the preparation zone of Wenchuan earthquake continuously took place in a preseismic week,which shift to magnetic equator and disappeared completely step by step.
- ionosphere /
- total electron content /
- spherical harmonic model /
- anomalous disturbance /
- earthquake