Latitude-Time Total Electron Content Anomalies as Precursors to Japan's Large Earthquakes Associated with Principal Component Analysis
Figure 6
(a) shows the TEC record in May 2005 (Unit: TECu) corresponding to the Kyushu earthquake of 20 March, 2005 M = 6.6 in Japan (Table 1) (TEC data of receiver near the epicenter, the receiver position is at 33.70°N, 129.70°E). (b) shows the principal eigenvalues using PCA applied to the TEC record. A larger principal eigenvalue is represented on March 09. These should be the anomalies caused by the earthquake on March 20.
