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科技导报  2015 

美国加利福尼亚州M6.0地震前电离层TEC异常分析

DOI: 10.3981/j.issn.1000-7857.2015.04.003, PP. 22-27

Keywords: 美国加利福尼亚州地震,电离层电子浓度总含量,地震空间前兆

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Abstract:

针对2014年8月24日世界时1020发生在美国加利福尼亚州地区(38.21°,-122.32°)的M6.0地震,利用美国地区全球定位系统(GPS)双频观测台网和欧洲定轨中心(CODE)绘制的全球电离层地图(GIM),分析震前上空电离层电子浓度总含量(TEC)的时间和空间变化。结果表明,震前2d震中附近区域TEC相对于前25d,TEC下边界限出现明显负异常;通过对全球范围电离层TEC变化的空间分析,震前2d震中附近区域异常减小的时间持续约40h,且TEC减小幅度和相对变化较为明显。此次地震前电离层TEC异常减少,与以往亚洲地区地震的统计分析结果较为一致,但对北美地区地震空间前兆规律还有待于积累更多资料及分析。

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