# GPS Results from Long Time Monitoring of Geodynamic Processes in South-Western Bulgaria
## 3 Obtained Horizontal Velocities  
The values of obtained velocities are shown in Table 3, where Ve and Vn are the east and north component of velocity in topocentric reference frame, respectively, and Sve and Svn represent the accuracy of the corresponding velocity component. The 1-sigma quality of each station is 0.06-0.17 mm/year for NS component and 0.05-0.18 mm/year for EW. The exceptions are two of the stations (GURM and LOZZ), which have only two epochs of measurements for each, and, in both cases, the first epoch is shorter. Their 1-sigma qualities are greater and are between 0.37 mm/year and 0.42 mm/year, but still are reliable. When plotted with 95% confidence ellipses, the velocities of all stations fall within the bounds of the ellipses (Figure 1). In the analysis, we examined the time series for all of the stations with measurements at three or more epochs, removing obvious outliers and further down-weighting those for which the normalized root-mean-square (nrms) was greater than 0.7. Five of these time series are shown in Figure 2. The rates and uncertainties estimated for the north and east components in the time series differ slightly from those given in Table 3 because, unlike the full velocity solution, the time series do not account rigorously for all correlations. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Point**} & \multicolumn{8}{c}{**Year of Measurements**} & \multicolumn{1}{c}{**Number**} \\ \cline{2-10}  & **1996** & **1997** & **2000** & **2001** & **2002** & **2003** & **2004** & **2012** & **2017** & **2020** & **2021** & **of Epochs** \\ \hline PADA & \(\ast\) & \(\ast\) & & & & & & \(\ast\) & \(\ast\) & \(\ast\) & \(\ast\) & \(\ast\) \\ PLA1 & \(\ast\) & \(\ast\) & \(\ast\) & & & \(\ast\) & & & & \(\ast\) & \(\ast\) & \(\ast\) \\ SATO & \(\ast\) & & & & & \(\ast\) & & & & & \(\ast\) & \(\ast\) & 3 \\ SLI1 & \(\ast\) & \(\ast\) & & & & & & & & & \(\ast\) & 3 \\ SOFI & \(\ast\) & \(\ast\) & \(\ast\) & \(\ast\) & \(\ast\) & \(\ast\) & \(\ast\) & \(\ast\) & \(\ast\) & \(\ast\) & 10 \\ VERI & \(\ast\) & \(\ast\) & & & & & & & & \(\ast\) & 3 \\ VETR & \(\ast\) & \(\ast\) & & & & & & & & \(\ast\) & 3 \\ VIII & \(\ast\) & \(\ast\) & & & & & & & & \(\ast\) & 3 \\ VLAD & \(\ast\) & \(\ast\) & \(\ast\) & & & & & & & \(\ast\) & 4 \\ ZEME & \(\ast\) & \(\ast\) & & & & & & & & \(\ast\) & 3 \\ \hline \end{tabular}
\end{table} 
Table 2: _Cont._ \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Point**} & **Lat** & **Long** & **Ve** & **SVe** & **Vn** & **SVn** \\ \hline
**ID** & [\(\circ\)] & [\(\circ\)] & [mm/year] & [mm/year] & [mm/year] & [mm/year] \\ \hline BANK & 42.72 & 23.07 & 0.60 & 0.06 & \(-1.65\) & 0.06 \\ BELI & 42.51 & 23.89 & 0.18 & 0.11 & \(-1.53\) & 0.09 \\ BELM & 42.14 & 23.76 & 0.10 & \(-2.29\) & 0.12 & 0.14 \\ BERK & 43.11 & 23.14 & 0.05 & 0.13 & \(-1.61\) & 0.07 \\ BOGS & 42.26 & 22.68 & 0.77 & 0.13 & \(-2.37\) & 0.06 \\ BOSN & 42.50 & 23.17 & 0.09 & 0.15 & \(-1.88\) & 0.12 \\ BUHO & 42.77 & 23.57 & \(-0.52\) & 0.15 & \(-1.60\) & 0.12 \\ CARV & 42.36 & 22.82 & 0.36 & 0.08 & \(-2.45\) & 0.04 \\ DELA & 42.39 & 23.09 & 0.34 & 0.05 & \(-1.76\) & 0.06 \\ DOB1 & 41.82 & 23.57 & 0.67 & 0.11 & \(-3.25\) & 0.09 \\ DSEC & 42.68 & 22.72 & 0.60 & 0.13 & \(-2.09\) & 0.10 \\ FROL & 42.13 & 22.94 & 0.23 & 0.10 & \(-1.92\) & 0.08 \\ GURM & 42.74 & 23.17 & 1.07 & 0.37 & \(-1.80\) & 0.32 \\ KRAL & 42.57 & 23.08 & \(-0.19\) & 0.10 & \(-1.54\) & 0.06 \\ LOZZ & 42.60 & 23.49 & 0.15 & \(-1.18\) & 0.39 & 0.42 \\ MALC & 42.27 & 23.51 & 0.61 & 0.13 & \(-2.14\) & 0.10 \\ MECH & 42.79 & 22.91 & 0.40 & 0.14 & \(-1.74\) & 0.12 \\ MUHO & 42.43 & 23.93 & 0.11 & 0.17 & \(-1.52\) & 0.13 \\ PADA & 42.14 & 23.18 & 0.75 & 0.10 & \(-2.67\) & 0.08 \\ PLA1 & 42.48 & 23.43 & 0.43 & 0.02 & \(-1.97\) & 0.02 \\ SATO & 41.59 & 23.91 & 0.42 & 0.17 & \(-3.08\) & 0.17 \\ SLII & 42.86 & 23.06 & 0.12 & 0.11 & \(-1.69\) & 0.09 \\ SOFI & 42.56 & 23.39 & 0.11 & 0.02 & \(-1.87\) & 0.02 \\ \hline \end{tabular}
\end{table}