A Study of Tropospheric and Ionospheric Propagation Conditions during Differential Interferometric SAR Measurements Applied on Zagreb 22 March 2020 Earthquake

The differential interferometric synthetic aperture radar (DInSAR) method is based on phase variation between the complex value of pixels timely separated scenes in SAR pairs. This has five components: surface topography, curvature planet’s surface, terrain displacement, volume scatterers, and atmospheric propagation effects. displacement main product DInSAR method, while last two effects are unpredictable bring inaccuracy into measurements. In this work, conditions troposphere ionosphere were studied during measurements examining Zagreb 22 March 2020 earthquake, with raising up to +3 cm at epicenter. For troposphere, vertical profile modified refraction index, which incorporates local change height, was reconstructed using aerological balloon probing data. Ionospheric determined total electron content (TEC) calculated from Croatian positioning system (CROPOS) global navigation satellite (GNSS) reference stations’ One conducted unfavorable tropospheric refractive conditions, resulted an overall bias ?2 cm. variability indicates need for when calculating displacements method. results indicate slight displacements, comparable amplitude variations, should therefore be approached caution.