震前电离层TEC异常分析

ON IONOSPHERIC TEC ANOMALY BEFORE EARTHQUAKE

利用地壳运动观测网络基准站的GPS载波相位观测值,对两个震例连续50天的VTEC数据做了时间序列分析,并以每15天的VTEC值的1.5倍标准差作为上下限进行震例检验,验证了震前存在电离层异常扰动。

On the basis of the GPS phase observation from the reference stations of crustal movement observation network, the continuous 50-day VTEC values before two Ms 〉 6 earthquakes are analyzed, and the earthquake examples are tested with 1.5-muliple standard diviation of 15-day VTEC values as limited range. The results show that there were the ionospheric anomalies before the two related earthquakes.