Abstract
Interferometric Synthetic Aperture Radar (InSAR) technique is able to detect a slope deformation around landslide (e.g., Singhroy et al., 2004; Une et al., 2008; Riedel and Walther, 2008; Sato et al., 2014). Geospatial Information Authority (GSI) of Japan has been performing the InSAR analysis regularly by using ALOS/PALSAR data and ALOS-2/PALSAR-2 data throughout Japan. There are a lot of small phase change sites except for crustal deformation with earthquake or volcano activity in the InSAR imagery. Most of the phase change sites are located in landslide area. We conducted field survey at the 10 sites of those phase change sites. As a result, we identified deformation of artificial structures or linear depressions caused by mass movement at the 9 sites. This result indicates that InSAR technique can detect on the continual deformation of landslide block for several years. GSI of Japan will continue to perform the InSAR analysis throughout Japan. Therefore, we will be able to observe and monitor precursory slope deformation around landslide areas throughout Japan.
Highlights
Synthetic Aperture Radar (SAR) data is able to provide detailed and spatially comprehensive ground information
The 7 sites were extracted from Advanced Land Observing Satellite (ALOS)/PALSAR interferograms, and the 3 sites were extracted from ALOS-2/PALSAR-2 interferograms (Table 1)
We conducted field survey at the 10 sites of phase changes detected by ALOS/PALSAR and ALOS-2/PALSAR-2 interferograms
Summary
Synthetic Aperture Radar (SAR) data is able to provide detailed and spatially comprehensive ground information. The InSAR imageries show the range change between the ground and the satellite, that is, the line-of-sight (LOS) displacement from phase difference. Satellite InSAR is able to detect ground deformation of several millimetres to several centimetres with several meters to dozens of meters resolution typically. Geospatial Information Authority (GSI) of Japan has been performing the InSAR analysis regularly by using ALOS/PALSAR data and ALOS-2/PALSAR-2 data to detect crustal deformation induced by large earthquake, volcanic activity and land subsidence, etc. In Addition, InSAR technique is able to detect a slope deformation around landslide There are a lot of small phase change sites except for crustal deformation with earthquake or volcano activity in the InSAR imagery. It is supposed that these phase changes are generated by slight slope deformation like precursory landslide. We conducted field survey at the 10 sites of those phase change sites and investigated deformation of artificial structures or topography with gravity sliding
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