The recent, frequent occurrence of heavy rainfall and earthquakes in Japan has triggered landslides. Heavy rain occurred in July 2018, causing a lot of damage, mainly in the west. In assessing the damage, data from the Synthetic Aperture Radar (SAR) was found to be effective, thanks to its ability to obtain observations with few restrictions related to weather or time. SAR Interferometry (InSAR) is a method for capturing surface deformations using two acquired SAR images. We detected the deformations of slope caused by the July 2018 heavy rain using the InSAR technique with ALOS-2/PALSAR-2 3-m resolution in Kagawa Prefecture, Japan. Along part of the Takamatsu-Ohgoshi-Sakaide Line, slope deformation of 5-6 cm was accurately detected by InSAR analysis.
