## 3 Results
### A-DInSAR at Local Scale  
In this section, we present the A-DInSAR dataset (Table 3) obtained in all the selected local areas (Figures 3 and 4). In addition, we show the analysis of one of them, Salinas town, which has been selected due to the significant problems related to slope instabilities registered in the BAPA database. In general, all the local areas present an adequate PS density for a local analysis. In the case of the PSIG software, the densities were higher than \(364.0\) PS km\({}^{-2}\). The GEP service presents densities higher than \(30.4\) PS km\({}^{-2}\) (Table 3). The density of PS obtained with PSIG was much higher than that of GEP, in the order of \(5.7\)-\(8.3\) times. The exception was found in the Podes Peninsula area, where there was not an adequate density of PS (\(30.4\) PS km\({}^{-2}\) of GEP and \(8.9\) PS km\({}^{-2}\) of PSIG) (Table 3). On the other hand, the deformation velocities observed were different from one area to another. For example, in the case of the Musel Port area, the PSIG software had detected LOS mean deformation velocities of between \(-17.1\) and \(6.0\) mm year\({}^{-1}\), while the GEP service had measured rates from \(-12.3\) to \(9.7\) mm year\({}^{-1}\). Likewise, their deformation time series present minimum and maximum accumulated displacements of \(-53.6\)-\(33.6\) and \(-26.8\)-\(32.1\) mm, respectively (Table 3). \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline
**Local** & **Area** & **PS km\({}^{-2}\)** & **PS km\({}^{-2}\)** & \multicolumn{3}{c}{**PSIG Software**} & \multicolumn{3}{c}{**GEP Service**} \\
**Areas** & **km\({}^{2}\)** & **PSIG** & **GEP** & **\#PS** & **VLOS** & **TS** & **\#PS** & **VLOS** & **TS** \\ \hline Salinas town & 3.9 & 876.2 & 117.7 & 3417 & \(-10.9\)\(-4.6\) & \(-27.6\)–\(23.5\) & 459 & \(-7.4\)-\(9.8\) & \(-17.1\)–\(18.9\) \\ Podes & 2.8 & 8.9 & 30.4 & 25 & 1.5\(\pm\)4.5 & 1.6\(\pm\)10.7 & 85 & \(-6.8\)–\(12.9\) & \(-13.7\)–\(28.9\) \\ Peninsula & 8.1 & 509.5 & 64.7 & 4127 & \(-4.6\)-\(7.4\) & \(-28.0\)–\(27.0\) & 524 & \(-10.9\)–\(8.9\) & \(-15.1\)–\(19.0\) \\ Candás town & 7.5 & 479.7 & 60.9 & 3598 & \(-4.7\)–\(6.2\) & \(-27.7\)–\(22.2\) & 457 & \(-11.6\)–\(9.1\) & \(-18.6\)–\(18.7\) \\ Musel Port & 4.7 & 850.0 & 102.6 & 3995 & \(-17.1\)–\(6.0\) & \(-53.6\)–\(33.6\) & 482 & \(-12.3\)–\(9.7\) & \(-26.8\)–\(32.1\) \\ Penarrubia & 11.6 & 364.0 & 63.9 & 4222 & \(-6.3\)–\(4.6\) & \(-22.3\)–\(23.7\) & 741 & \(-12.6\)–\(8.7\) & \(-28.0\)–\(15.4\) \\ \hline \end{tabular}
\end{table} 
Table 3: A-DInSAR results for each local area selected: #PS—Number of points detected; VLOS—LOS mean deformation velocity rates in mm year\({}^{-1}\); TS—minimum and maximum deformation accumulated in mm. Of the 6 areas studied at a local scale, the Salinas area was the one that best represents the history of slope instabilities in the Peras Cape surroundings. This area was situated in the West of the study area, including the town of Salinas (Castrillon administrative area) (Figures 3 and 4, Figures 6 and 7). From a lithological point of view, the bedrock was constituted by dolomite, limestone, slate, marl, sandstone, conglomerate, and some coal layers, covered by quaternary materials such as rasa, beach, alluvial, and slope deposits. In addition, anthropogenic deposits and erosion forms were present in the area, especially in Salinas (the East of the town) and the sectors of Arnao and El Cuerno Beach (Figures 6 and 7). According to the BAPA database, there were a total of 78 slope instabilities between August 1993 and February 2019 in this area. The events were 29 flows (37.2%), 21 rockfalls (26.9%), 21 undetermined events (26.9%), 6 slides (7.7%), and 1 crack (1.3%). Their spatial  
Figure 7: Salinas town. (**a**) LOS mean deformation velocity map by PSIG chain; (**b**) LOS mean deformation velocity map by GEP service; (**c**) Deformation time series obtained by PSIG and GEP. OptoPNOA 2017 CC-BY 4.0 scne.es. distribution can be observed in Figure 7. Examples of three slope instabilities produced in this area are shown in Figure 6d,e.