## 3 Results
### Shear-Wave Splitting Parameters
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline
**Station** & **N** & \(\overline{\varphi}\) (\({}^{\circ}\)) & \(\overline{\delta\varphi}\) (\({}^{\circ}\)) & \(\overline{t_{d}}\) (ms) & \(\delta\overline{t_{d}}\) (ms) & \(\overline{t_{n}}\) (ms/km) & \(\delta\overline{t_{n}}\) (ms/km) & **OC (\({}^{\circ}\))** \\ \hline
**ALL** & **2024** & **98.8** & **2.8** & **112.3** & **1.4** & **9.2** & **0.1** & - \\ AGRP & 27 & 88.7 & 11.7 & 72.2 & 9.1 & 5.0 & 0.6 & 0 \\ AIOA & 104 & 79.4 & 7.7 & 62.4 & 3.7 & 5.2 & 0.3 & 20 \\ ALIK & 237 & 115.4 & 7.4 & 131.3 & 3.9 & 12.5 & 0.4 & 299 \\ EFP & 72 & 82.4 & 11.5 & 122.1 & 8.1 & 9.8 & 0.7 & 0 \\ HELI & 56 & 77.6 & 11.6 & 71.3 & 4.5 & 7.4 & 0.5 & 340 \\ KALE & 94 & 109.0 & 17.6 & 107.4 & 5.7 & 7.5 & 0.4 & 0 \\ LAKA & 102 & 134.7 & 5.9 & 117.5 & 5.1 & 8.1 & 0.3 & 0 \\ MALA & 30 & 68.1 & 11.0 & 124.3 & 10.1 & 11.3 & 0.8 & 233 \\ MG00 & 45 & 82.2 & 7.5 & 126.2 & 9.0 & 10.4 & 0.8 & 0 \\ MG02 & 88 & 94.1 & 12.3 & 111.3 & 7.2 & 9.8 & 0.7 & 0 \\ MG03 & 44 & 67.1 & 30.8 & 111.8 & 9.3 & 9.2 & 0.7 & 0 \\ MG04 & 68 & 106.3 & 19.8 & 113.8 & 7.3 & 9.6 & 0.6 & 0 \\ MG05 & 29 & 60.7 & 26.3 & 107.6 & 10.1 & 9.1 & 1.1 & 0 \\ MG06 & 65 & 85.6 & 8.9 & 116.5 & 7.7 & 9.9 & 0.7 & 83 \\ MG07 & 70 & 96.3 & 26.9 & 113.9 & 7.7 & 9.8 & 0.7 & 0 \\ PANR & 17 & 132.8 & 36.6 & 105.3 & 14.1 & 7.2 & 0.9 & 345 \\ PSAR & 287 & 99.9 & 4.8 & 134.5 & 3.8 & 9.3 & 0.3 & 0 \\ PYRG & 91 & 142.2 & 41.6 & 114.1 & 5.9 & 9.3 & 0.5 & 0 \\ ROD3 & 95 & 116.2 & 15.1 & 114.4 & 5.7 & 9.1 & 0.5 & 0 \\ SERG & 87 & 58.4 & 7.5 & 86.0 & 6.1 & 6.6 & 0.5 & 0 \\ TEME & 64 & 145.1 & 16.3 & 116.4 & 7.6 & 12.3 & 0.8 & 20 \\ TRIZ & 101 & 96.7 & 5.8 & 101.1 & 5.5 & 8.5 & 0.5 & 90 \\ VVK & 27 & 115.2 & 23.8 & 85.2 & 12.7 & 6.9 & 1.0 & 0 \\ ZIRI & 124 & 106.2 & 7.3 & 106.5 & 5.2 & 8.1 & 0.4 & 0 \\ \hline \end{tabular}
\end{table} 
Table 2: Mean values of SWS parameters, i.e., mean polarization direction of the fast shear-wave, \(\overline{\varphi}\), mean time-delay between the two split shear-waves, \(\overline{t_{d}}\), and mean normalized time-delay, \(\overline{t_{n}}\), along with their respective uncertainties per station for valid measurements (grade A-C) of Cat1. Errors \(\delta\overline{\varphi}\) correspond to the 95% c.i. of the mean value, whereas \(\delta\overline{t_{d}}\) and \(\delta\overline{t_{n}}\) are the respective typical errors of the mean. \(N\) is the number of valid measurements per station. The first line in bold corresponds to all valid measurements of Cat1. The last column, “OC”, indicates the orientation correction applied on some stations, given in the form of the true azimuth of the instrument’s N-S component. travelling through the \(\pm 15^{\circ}\) solid angle from the crack-plane are classified as \"Band-2\" measurements and are more affected by the microcrack density [64]. Optional filters are applied to remove part of the \(t_{\mathrm{n}}\) measurements, such as those affected by a higher angle of incidence at the surface, having strong spatial dependence or having a lower quality grade. In addition, temporal variations of \(t_{\mathrm{n}}\) are also examined after discarding results related to \(\varphi\) measurements that significantly differ from the \(\overline{\varphi}\) of that station measured from Cat1, which may be potentially erroneous. For events of Cat2 (automatic), we applied a focal depth correction, as their lower quality hypocenters tended to be scattered at much shallower depths than their neighboring events of Cat1, causing inconsistencies in the \(t_{\mathrm{n}}\) dataset of Cat3. This was performed by applying, for each event of Cat2, the average focal depth of the events of Cat1 with neighboring epicenters (excluding those with \(Z>15\) km). This modification reduces some outliers in Cat2 that yielded erroneously high \(t_{\mathrm{n}}\) values due to the shorter distance (shallower depth).