华南地区电离层在汶川地震前VTEC异常的研究

Study on VTEC Anomaly of Ionosphere in South China before and after Wenchuan Earthquake

基于华南地区GPS监测网数据,解算出华南地区电离层VITEC在汶川地震前出现的异常。从时间序列和空间等值线分布两方面分析了VTEC的变化,时间序列分析表明5月4日至5月12日电离层VTEC负异常扰动明显,5月4日至5月13日的空间分布也表明了同样的结论,并同时指出负异常有向低纬度区域漂移的趋势。并对异常判断依据和机理作了初步的讨论。

Based on the GPS-VTEC observation data from Guangzhou GPS observation network, we computed the VTEC anomalies of ionosphere in South China before and after Wenchuan earthquake. From the time series and isoline distribution, we analyzed the changes of VTEC. The result and analysis indicate that there were ionospheric VTEC negative anomalies during one week prior to the earthquake. The isoline distribution also shows that the ionospheric VTEC negative anomaly moved towards low latitude regions. Further we preliminarily discussed the judgment basis and mechanism of ionosphere anomaly caused by strong earthquakes.