## 5 Results and Discussion  
Displacements for each station are visualized in subfigures in Figure 3. The data scales on the ordinate axis of subfigures are not mutually identical since the scale of the shift differs greatly between the stations. Blue and red dots represent the behavior of the CORS GNSS station before and after the earthquake, respectively. The values displayed on the subfigures are the differences between the daily adjusted GNSS solution and the median value of the daily adjusted solution before and after the earthquake. As expected, Sisak (SISA) station had the biggest displacement by far. However, the magnitude of the displacement is more severe than expected: the station displaced 5 cm to the east and 1.8 cm to the south. The daily solutions after the earthquake show the stability of its behavior after the mainshock, retaining the displaced position in the following days. Regarding the height displacement, it slipped by \(-2.5\) cm with a slight trend toward depreciating even more. \begin{table}
\begin{tabular}{l c} \hline \hline
**Properties** & **Description** \\ \hline Spatial resolution & 5 m ground range \(\times\) 20 m (azimuth) \\ Pixel spacing & 2.3 m (slant range) \(\times\) 14.1 (azimuth) \\ Incidence angle & 29\({}^{\circ}\)-46\({}^{\circ}\) \\ Polarization & HH + HV, VH + VV + HH, VV \\ Total swath width & 250 km \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Properties of Sentinel 1 interferometric wide (IW) single-look complex (SLC) products. \begin{table}
\begin{tabular}{l l c c c c c} \hline \hline
**Sensor** & **Pass** & **Rel. Orbit** & **Track** & **Data Type** & **Polarization** & **Acquisition Date** \\ \hline Sentinel 1A & Desc. & 124 & T050 & Master & VV & 17 December 2020 \\ Sentinel 1A & Desc. & 124 & T050 & Slave & VV & 10 January 2021 \\ Sentinel 1A & Asc. & 146 & T165 & Master & VV & 6 December 2020 \\ Sentinel 1A & Asc. & 146 & T165 & Slave & VV & 23 January 2021 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Technical information on the SAR images used in the analysis. Figure 3: The distortions in each component are computed and visualized, providing insights into how the earthquake has affected the positioning of the CORS stations. The components shown for each station are the horizontal position in the east-west direction Easting (\(E\)), horizontal position in the north-south direction Northing (\(N\)), and vertical position, i.e., height (\(h\)) components of CORS stations. The distortions are computed for period of 10 days prior (in blue color) and ten days after the earthquake  
(in red color) which allows for analysis of immediate impact and subsequent changes in the CORS station positions post-earthquake. By comparing the blue and red components, the subfigures facilitate a visual and numerical assessment of the extent and direction of distortions caused by the earthquake at each of the CORS stations. Regarding the remaining observed stations, the most substantial positional and vertical displacements are evident in four specific locations: Novi Grad (NOVI), Zagreb (ZAGR), Novska (NOVS), and Bielovar (BJEL). A comparison of these stations, their notable displacements, and their geographical positioning (as illustrated in Figure 3) indicates that stations located to the east of the epicenter are more significantly impacted than those situated on the western side. Novi Grad station has a clear shift of 1.3 cm to the north, with Zagreb shifting 1 cm to the south, Novska 1 cm to the east, and Bielovar 0.8 cm to the north. The displacement of other components cannot be attached to the earthquake consequence due to the small values of the shift that can be considered to be the regular dynamics of daily values. Furthermore, at some of the other stations, the displacement in one direction, although smaller, is clearly visible from the processed results: Karlovac (KARL) has visible displacement to the west, Slatina (SLAT) and Nova Gradiska have displacement to the northeast, and Zagob (ZABO) has a slight displacement to the east.