Impact of Different Multi-Source Vertical DEM Accuracy on Deformation Estimation in the Pasuruan Fault Zone using Development of Decomposition Calculation LOS InSAR, Azimuth Tracking Offset, and GPS

The main challenge in analyzing fault activity using geodetic methods is estimating accurate 3D components. This study presents a combination of several geodetic methods, namely LOS InSAR, Azimuth Tracking Offset, and GPS Station Ina-CORS, in decomposition calculations to obtain good horizontal and vertical components. To ensure accurate estimation of deformation results from LOS InSAR, this study analyzed several DEMs that are suitable for topographic phase correction, followed by testing the vertical accuracy of each DEM used in the processing. In addition, the combination of PS-InSAR and SBAS aims to obtain adequate accuracy and a number of points in describing deformation in LOS. Due to the insensitivity of LOS InSAR results in the azimuth direction, this study uses the azimuth tracking offset method to obtain estimates of deformation movement in the azimuth direction. The Ina-CORS Station's GPS shift velocity data for the ve and vn components are also presented in this study. By integrating all data processing outcomes into a single equation, 3D decomposition produced the final deformation or shift velocity estimations that are displayed. The three primary components of the analysis, VN and VU, are the outcomes. The decomposition model developed can handle the difficulty of portraying geodynamic activity happening in fault zones, especially the Pasuruan fault, according to the results of this decomposition calculation.