Perturbation analysis of the ionospheric TEC before and after the Lushan MS7.0 earthquake
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摘要: 基于IGS提供的GIM数据和陆态网测站数据， 采用统计学分析法对芦山MS7.0地震前后各10天的垂直总电子含量(VTEC)进行统计分析. 结果显示， 4月16—21日出现明显的VTEC异常减少. 因此， 在排除太阳活动因素后， 认为电离层的异常变化有可能是地震发生的前兆信息.Abstract: By using the statistical analysis method, the ionospheric VTEC data of ten days before and after the Lushan MS7.0 earthquake have been analyzed and discussed in detail, based on the GIM data offered by IGS and the Crustal Movement Observation Network of China.The results show that obvious VTEC reduction appeared between 16 and 21 April, 2013. So the abnormal variations of the ionospheric TEC may be precursors to the earthquake, excluding the solar activity factors.
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Keywords:
- ionosphere /
- VTEC /
- Lushan MS7.0 earthquake /
- anomaly
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图 1 芦山地震震中(星形)及陆态网测站(红色三角形)分布图
Figure 1. Epicenter (denoted by star) of the Lushan MS7.0 earthquake and distribution of sites (denoted by red triangles)
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图 2 芦山MS7.0地震震中上空2012年4月—2013年3月VTEC时间序列
Figure 2. Time sequence of VTEC over the epicenter of Lushan MS7.0 earthquake during April 2012 through March 2013
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图 3 芦山地震前、后10天震中上空VTEC时间序列
Figure 3. Time sequence of VTEC over the epicenter ten days before and after the Lushan earthquake
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图 4 芦山地震震中上空VTEC偏离上下界值的时间序列
Figure 4. Time sequence of VTEC deviation between upper and lower boundaries over the epicenter of Lushan earthquake
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图 5 芦山地震前后太阳活动指数与磁暴指数
Figure 5. Solar activity and geomagnetic storm index before and after Lushan earthquake
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图 6 芦山地震前(a)、 后(b)10天不同纬度的二维VTEC与上下界的差值.图中红色直线代表地震发生对应的纬度
Figure 6. Two-dimensional VTEC deviation between upper and lower boundaries in different latitudes 10 days before (a) and after (b) Lushan earthquake where red lines represent the corresponding latitudes about the earthquake
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