## 4 Results  
For the analysis of the degree of deformation present in the Santander rock massif in the study region, we started with the construction of the temporal sequences of differential interferometry from the Sentinel-1 images. For this construction, the study region (creation of the polygon) was delimited within the ASF portal for the selection of images in order to define the baseline and subsequently develop the SBAS technique [2; 6]. The configuration parameters described in Section 3, steps 1 and 2, were applied for each pair of Sentinel-1 images in its ascending and descending orbit. The selected Sentinel-1 images covered the period from 2014 to 2021, with a ratio between images (master and slave) of every three months (90 days) and a spatial resolution of 40 m. A total of 59 Sentinel-1 images were taken from the present selection, generating a total of 225 pairs for differential interferometry (111 ascending and 114 descending) [42; 43]. The images selected for the production of the interferograms had a temporal (<90 days) and short spatial (<200 m) baseline to limit the loss of coherence between pixels [58]. With the baseline established and the configuration parameters selected, the differential interferograms were calculated using the SBAS technique by means of the ASF HyP3 program [45; 46]. To eliminate the topographic contribution, as mentioned in Section 3, the ASF HyP3 program takes as its base the Copernicus GLO-30 DEM with a spatial resolution of 30 m; in turn, for the execution of the work order, a selection was made by the type of product to be obtained based on the required spatial resolution. This selection considered two types of appearance, 20 \(\times\) 4 or 10 \(\times\) 2, which determine the resolution and pixel spacing of the resulting images (products). The first number indicates the number of _looks_ in the range and the second number is the number of _looks_ in azimuth [45; 46]. For the present research, the 10 \(\times\) 2 appearance generated by a product with a spatial resolution of 40 m was taken, since the 20 \(\times\) 4 appearance has a resolution of 80 m. The 10 \(\times\) 2 appearance was taken because the generated product has a high degree of detail which can provide a greater contrast of the zones of punctual deformation over the study region, which also favors the correlation with the areas that have historically presented unstable points on the surface (mass movements). The products generated and subsequently downloaded from the ASF portal were delimited to the geometry of the study region (404 km\({}^{2}\)), in order to perform the analysis of the deformation from the statistical control points (SCP), followed by the correlation with the catalog of seismic events associated with each tectonic geometry. The first product obtained corresponded to the coherence map, which was an important basis for the following analyses, since this product determines the degree of correlation between the pair of processed SAR images. The coherence threshold used was \(\geq\)0.5 (medium to high _multilook_ factor) for the present research. From this threshold, an average of 24,105 coherent pixels out of 252,377 was described for the entire study region between the ascending-orbiting interferograms and 19,930 coherent pixels for the descending-orbiting interferograms (Figure 3a). To perform the statistical analysis, a sample size of 3550 SCP was taken for interferograms in ascending orbit and the same for the descending orbit; this selection was made randomly (Figure 3b). From the correlation of the SCP with each interferogram in ascending orbit, it is described that, for the range between 0.7 and 1, there is a number of 67.2% of coherent accumulated pixels (Figure 3c), and for interferograms in descending orbit at that threshold, 64.2% of coherent cumulative pixels are present (Figure 3d). At the same time, it is observed that the number of pixels with a good correlation with reference to the total area of study is very low, in a ratio of 1:10 (approx.