海地地震前电离层电子含量数据异常分析

The Variation of Ionospheric Total Electron Content Before Haiti Earthquake

利用美国国家海洋和大气管理局(NOAA)提供的电离层总电子含量(TEC)数据,研究了2010年1月12日海地首都太子港发生MS7.3级地震,采用从点到面、从时间到空间的方法分析了震前1个月的TEC变化,发现在海地震前3天TEC出现异常扰动.首先,利用时间序列曲线分析发现2010年1月10至12日之间的TEC异常增大,最大值超过月均值的3倍标准差.其次,利用空间分布图发现10至12日TEC异常区主要分布在震中附近.最后,利用"面-时间段"数据分析发现震中5个经纬度内范围内TEC在震前3天出现异常增大,震前1天达到最大值,震后TEC数值回落.结果分析说明,该异常和海地地震有关.

A devastating MS7.3 earthquake hit the capital of Haiti on January 12, 2010. Here TEC （Total electron content） data provided by NOAA is used to analyze the ionosphere change before Haiti earthquake. First time se- ries TEC data from December 12, 2009 to January 12, 2010 is plotted, and the result shows the TEC value begin to increase 3 days before the quake, and it gets to the maximum value just 1 day before the quake; Second the spatial distribution of TEC map is plotted, and the result shows that the TEC anomaly just exists near the epicenter in the whole north and central America continent; Finally TEC data within 5 degrees around the epicenter is calculated, and it shows the TEC gets to the maximum value 1 days before the quake, and drops after the quake. So by analyzing from the temporal and spatial features, we consider that the TEC anomaly is related to the Haiti earthquake.