Observation of ground deformation in the Osaka and Kanto plains with ALOS-2/PALSAR-2

摘要

We have studied ground deformation in the Osaka and Kanto plains, Japan, using ALOS/PALSAR and revealed unique deformations related to active faults. In order to clarify their evolution after 2011, we analyzed strip-map mode images of ALOS-2/PALSAR-2 acquired during 2014-2015. In Osaka, we did not find deformation observed before 2011 such as uplift in southern Kyoto and subsidence along the Arima-Takatsuki fault, even after we corrected altitude dependent error of phase for interferograms with quadratic functions. We found less than 1 cm/yr LOS changes, but correlation with deformation is poor possibly due to short interval. We also found anomalous LOS decrease in a basin in northwestern Kanto in summer, which might be attributed to dense water vapor concentration.