2008年汶川地震前电离层异常研究

被引:7
作者
熊晶 [1 ,2 ]
吴云 [1 ,2 ]
周义炎 [1 ,2 ]
林剑 [1 ,2 ]
机构
[1] 中国地震局地震研究所
[2] 地壳运动与地球观测实验室
关键词
COSMIC; 电离层; 地震; 全球定位导航系统; 无线电掩星;
D O I
10.14075/j.jgg.2011.02.028
中图分类号
P315.72 [地震前兆与地震机理];
学科分类号
070801 ;
摘要
利用FORMOSAT-3/COSM IC提供的2007—2010年掩星剖面数据,研究汶川Mw7.9地震前,孕震区及磁共轭区上空电离层的变化。研究表明,震前5天内(5月7—11日),孕震区电离层F2层最大电子密度NmF2值在4:00—8:00UT(12:00—16:00LT)相对于震前6~17天(4月25—5月6日)明显减小,幅度达(2~4)×105el/cm3。另外,取2007—2010年(不包括2008年)5月7—11日下午12:00—14:00LT孕震区上空的NmF2值作为多年背景值,发现2008年震前5天的NmF2值相对多年同时段背景值明显减小,幅度为(2~4)×105el/cm3。并且在孕震区对应的磁共轭区也有与上述类似的现象出现。
引用
收藏
页码:28 / 31
页数:4
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