11:00 AM - 11:15 AM
[SSS16-08] Co- and post-seismic crustal deformations associated with the 2016 Kumamoto earthquake sequence using ALOS-2/PALSAR-2 data
Keywords:Synthetic Aperture Radar, 2016 Kumamoto Earthquake Sequence, Crustal Deformation, Surface Ruptures, SAR Interferometry, ALOS-2/PALSAR-2
We also report the post-seismic deformations following the 2016 Kumamoto earthquake using PALSAR-2 data, and discuss the difference of spatial characteristic in the co- and post-seismic deformations. Although some papers have also reported post-seismic deformations observed by GNSS measurements and Sentinel-1 InSAR data for estimating viscoelastic structures beneath the central Kyushu island, near-fault post-seismic deformations are still poorly understood. We employed the conventional InSAR stacking for extracting long-lasting small deformations and mitigating artificial noise. We also performed the 2.5-dimensional analysis for depicting quasi-eastwest and quasi-vertical displacements using the stacked interferograms. To identify the small deformation signals, two independent quasi-displacement fields are generated. Although multiple aperture interferometry (MAI) allow us to detect along-track horizontal movements, we could not identify actual post-seismic deformation signals due to strong ionospheric artifact noises in most of MAI data.