Latitude-Time Total Electron Content Anomalies as Precursors to Japan's Large Earthquakes Associated with Principal Component Analysis
Figure 5
(a) shows the latitude-time TEC records in Japan for 2005 (Unit: TECu). (b) shows 12 principal eigenvalues in 2005. Six larger principal eigenvalues are represented in March, July, August, October, November, and December in which six earthquakes occurred on March 20, July 23, August 16, October 19, November 14, and December 2 (Table 1).
