Interferometry Synthetic Aperture Radar (InSAR) is widely known for its ability to determine surface displacement with typical accuracy in the millimeter to centimeter range. When the true displacement vector proceeds from the satellite’s line-of-sight (LOS), its sensitivity falls, and InSAR deformation observations become challenging to interpret. We estimate 2.5D displacement from InSAR (Vertical and East-West direction) by combining LOS displacement observation from ascending and descending orbital geometries of Sentinel-1 datasets acquired during the 2022 Pasaman earthquakes. Vertical and west-east displacement data are decomposed and confirmed using continuous GNSS observation (GNSS CORS) data. The deconstructed displacement is being utilized to investigate surface velocity and direction changes around the Pasaman earthquake epicenter in 2022. InSAR LOS measurements yield varying LOS velocities, not only in the pattern but also in velocity, depending on the geometry of the SAR satellite. The LOS displacement velocities in each direction were compared to the 2.5D displacement from fused InSAR. The RMSE of the vertical (up-down) component is 1.552 cm, whereas the RMSE of the east-west is 4.473 cm. We have found that the InSAR multi-geometry fusion approach is 30-51% more accurate in the vertical component than each LOS velocity. Furthermore, our approach accurately distinguished the vertical and horizontal displacement components of the Pasaman earthquake with high precision.
Precise coseismic displacement related to the 2022 pasaman earthquake using multi-geometry of Sentinel-1 InSAR
THE 9TH INTERNATIONAL SEMINAR ON AEROSPACE SCIENCE AND TECHNOLOGY – ISAST 2022 ; 2022 ; Bogor, Indonesia
AIP Conference Proceedings ; 2941 , 1
11.12.2023
7 pages
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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