## 3 Result and Discussion  
### Displacement Rate  
The displacement rates and velocity fields were calculated during 201 campaigns and at continuous observation stations along the Kendeng Fault. Two types of velocity calculations were performed, as detailed in Tables 1 and S1. The velocity values relative to the ITRF2014 range from 13.12 to 40.9 mm/year for the EW component, \(-15.24\) to 8.64 mm/year for the NS component, and \(-131.3\) to 21.63 mm/year for the up--down (UD) component. In contrast, the velocity fields relative to the Sunda block show a narrower range between \(-11.29\) to \(16.13\) mm/year for the EW component and \(-5.76\) to \(17.19\) mm/year for the NS component. When velocities are referenced to the Sunda block, they reflect primarily the localized movements within this stable block. This observation suggests that localized movements within the Sunda block are smaller than those recorded against the ITRF, highlighting the complexities of tectonic dynamics in the Eastern Java back--arc thrust region. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline \multirow{3}{*}{**No.**} & \multirow{3}{*}{
\begin{tabular}{c} **Station** \\ **Name** \\ \end{tabular} } & \multicolumn{6}{c}{**Velocity with Respect to ITRF2014**} & \multicolumn{6}{c}{**Velocity with Respect to Sunda Block**} \\ \cline{2-13}  & & **EW** & **NS** & **UD** & \(\sigma\)**EW** & \(\sigma\)**NS** & **\(\sigma\)**UD** & **EW** & **NS** & **UD** & \(\sigma\)**EW** & \(\sigma\)**NS** & \(\sigma\)**UD** \\  & **(mm)** & **(mm)** & **(mm)** & **(mm)** & **(mm)** & **(mm)** & **(mm)** & **(mm)** & **(mm)** & **(mm)** & **(mm)** & **(mm)** & **(mm)** \\ \hline
1 & CBLR & 23.56 & \(-10.38\) & 1.03 & 0.77 & 0.26 & 1.71 & \(-0.83\) & \(-1.06\) & 1.03 & 0.78 & 0.25 & 1.71 \\ \hline
2 & CLMG & 26.43 & \(-9.18\) & \(-6.32\) & 0.22 & 0.17 & 0.69 & 2.22 & 0.48 & \(-6.32\) & 0.25 & 0.18 & 0.69 \\ \hline
3 & CMAG & 28.34 & \(-6.65\) & \(-0.59\) & 0.26 & 0.18 & 0.77 & 4.63 & 2.54 & \(-0.59\) & 0.33 & 0.20 & 0.77 \\ \hline
4 & CMJT & 26.84 & \(-6.59\) & \(-7.01\) & 0.20 & 0.18 & 0.56 & 2.78 & 3.14 & \(-7.01\) & 0.26 & 0.20 & 0.56 \\ \hline
5 & CNGA & 27.78 & \(-7.22\) & \(-7.88\) & 0.20 & 0.15 & 0.58 & 3.81 & 2.27 & \(-7.88\) & 0.25 & 0.17 & 0.58 \\ \hline
6 & CPWD & 25.58 & \(-9.41\) & \(-9.21\) & 0.22 & 0.20 & 2.25 & 1.37 & \(-0.36\) & \(-9.21\) & 0.26 & 0.21 & 2.25 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Detailed magnitude of the secular motion from 2016 to 2023. The columns are continuous stations name [Station Name], velocity [EW, NS, UD], and uncertainty [\(\sigma\)EW, \(\sigma\)NS, \(\sigma\)UD]. The visual representation of the ITRF2014 reference velocity results alongside the reduced velocity of the Sunda block is illustrated in Figure 5. Specifically, Figure 5a depicts the outcomes and direction of the ITRF2014 reference velocity, which predominantly indicates a southeastward movement across all observation points, consistent with previous studies [14]. In contrast, Figure 5b presents the results and direction of the Sunda block's reduced velocity, revealing a range of predominantly counterclockwise directions that reflect the local deformation patterns in the region, aligning with several studies [9; 16].