[STT50-P02] Progress for detecting surface displacement associated with 2018 Boso SSE by ALOS-2 ScanSAR interferometry
Keywords:InSAR, slow slip event, atmospheric delay
We performed the InSAR analysis using the RINC software version 0.41 to interfere 14 ScanSAR images. The ScanSAR data used here spans from January 2016 to September 2019. The path and frame are 17 and 2900, respectively. Topographic phase contributions were modeled and removed by the use of the SRTM4 30m DEM. All the interferograms were phase-unwrapped with the SNAPHU software. Since interferograms were to some extent contaminated by the phase noise due to ionospheric disturbances, we applied the Split Spectrum Method for all the interferograms to remove this.
Most of processed interferograms showed significant coherence to recover the SSE displacement, although the non-dispersive atmospheric delay signal was also significant. The ionospheric contribution that is the dispersive component of the atmospheric delay could be effectively removed by the Split Spectrum Method.
By the presentation, I will perform the time series analysis and the atmospheric delay correction to mitigate the non-dispersive atmospheric contribution and to detect the SSE signal. I will present the progress of this study in the presentation.