Analysis on ionospheric perturbation of TEC and N(m)F2 based on GPS and COSMIC data before and after the Wenchuan earthquake

作者：Ma Xin-Xin^*; Lin Zhan; Chen Hua-Ran; Jin Hong-Lin; Jiao Li-Guo; Liu Xiao-Can

来源：Acta Geophysica Sinica, 2014, 57(8): 2415-2422.

DOI：10.6038/cjg20140803

• Wenchuan earthquake
• TEC
• N(m)F2
• Co-seismic response

The study provides a TEC data processing method by correlation analysis and power spectral density analysis. We investigated the variation of the TEC data in time domain and frequency domain and discussed their relationship with Wenchuan earthquake. At the same time, we analyzed the spatial distribution variation of N(m)F2. It was found that the correlation coefficients have various degrees of change for each station on 9 May 2008, and the usual good correlation is broken. The TEC power spectrum amplitudes of 24h diurnal wave and 12h semidiurnal wave changed significantly in the period of earthquake occurrence. The amplitude of N(m)F2 variation increased significantly from February 12 to June 11. Spatial and temporal distribution variation of TEC and N(m)F2 showed ionospheric disturbances prior to the Wenchuan earthquake and co-seismic response, and the anomalous variation of TEC is more significant after the earthquake. The above results showed that the method can effectively detect the anomalous variation of ionosphere before and after earthquake.

• 出版日期2014-8
• 单位中国地震局; 中国地震局地震预测研究所