Wenchuan earthquake ionosphere TEC anomaly detected by GPS
基于GPS探测汶川地震电离层TEC的异常

Utilizing spherical harmonic model, the GPS observational data of fiducial station in the crustal movement observation network of China and IGS fiducial station, calculating the total electron content of Chinese and global region respectively, and adopting different statistical analysis method, we examined the TEC on Wenchuan epicenter and around the region. As a result, we found that the anomalous VTEC disturbances over seismic preparation zone continuously took place in a week before and after the earthquake, whose form had conjugate structure and shifted to magnetic equatora.