2007 The Niigataken Chuetsu-oki Earthquake and Noto Hanto Earthquake
-Surface Displacement from the M6.8 and M6.9 Earthquake- Differential Interferometric SAR (DInSAR) Analysis

Differential interferometric SAR processing of satellite SAR data analyzes the amount of surface displacement that occurs between two observations. The displacement is detected in the line-of-sight (LOS) direction, which is the direction from the satellite to the ground. The microwave used in SAR are typically in the C-band (5.6 cm) or L-band (23.6 cm), and the detectable displacement is generally about 1/10 to 1/20 of the wavelength. In the case of “The Niigataken Chuetsu-oki Earthquake in 2007” (Figure 1), shortening in the LOS direction reached approximately 30 cm due to the earthquake. For the “Noto Hanto Earthquake in 2007” (Figure 2), LOS shortening exceeded 50 cm.