## 5 Analysis of Results and Discussion  
The sedimentary succession of \"Las Cabras\" hill (Duran) is characterised by the alternation of breccias, strongly fractured and weathered fine-grained silty sandstones, shales and argillites. The rock mass has a high weathering degree and both mechanical and chemical deterioration, which favours the formation of clay and residual soils. The instability observed on different slopes of \"Las Cabras\" hill is due to--among other causes--the dipping of the layers in the direction of the slope. This means that they are susceptible to different types of mass movement, as indicated by several authors [3,4]. Susceptibility was assessed (Figure 7) through a combination of methods, in which several geomechanical parameters were considered [21, 57, 61, 63, 64]. This allowed a specific categorisation (low to very high) of the landslide and rockfall conditions in the study area. The stability analysis demonstrated that different zones present an unstable equilibrium. Three of the studied profiles obtained values lower than one (profiles CP10, CP12 and CP13), and two profiles obtained values close to one (profiles CP15 and CP16). According to the NEC-15 [66], [PERSON] [69] and [PERSON] et al. [21], safety factors (SF) less than one represent instability. The zones classified with high and very high susceptibility (Figure 8) correspond to layers of shales and fractured sandstones. These zones were validated with the low resistivities (between 0 and 45 \(\Omega\)m) in the first 15 m of the VESs carried out (Supplementary Table S4). Additionally, from the results of Table 15 (comparing SC and SF\({}_{\text{pseudostatic}}\)), it can be observed that they agree with one another well. For example, the CP10 profile has a very high SC that agrees with the obtained SF of 0.76. Additionally, the CP04 profile has a high SC and agrees with the SF obtained of 1.25 (in Supplementary Figure S6 can be seen the zoning map using the safety factor). Thanks to these comparisons, the reliability of the applied expert methodology can be established. This methodology considers the experience of the researchers and the geological-geotechnical characteristics, the relief and the environmental characteristics of the study site. This method has been used to assess landslide and detachment susceptibility in areas of sub-vertical and vertical slopes, and urban areas or sites of direct or indirect impact on populations or heritage sites. [21, 54, 56, 64]. The obtained results provide a basis for stabilisation measures, solutions and territorial planning that guarantee safety. As a guideline of territorial planning, if it is not possible to ensure security in a given area, it must be reorganised. Figure 11 indicates the areas that must be given top priority. Two zones were identified where human settlements are present and the landslide susceptibility is very high: area 1 (2.93 Ha) and area 2 (0.54 Ha). Figure 11: Housing and susceptibility zoning. The stabilising measures should be selected so that they also generate added value. These works must start on the crown of the slope and proceed downwards. We do not propose to vacate houses, except those few that are particularly unsafe and are removed from the rest of the buildings. Solutions are proposed for both the southern and northern sides of \"Las Cabras\" hill. For the northern side, injected anchors (using gunite and \(\O25\) mm rods) and mechanical drains are proposed to reduce the water table in that area, and to be applied in combination with stairway-like surface channels to evacuate rainwater (Figure 12). Although a detailed study of triggers is beyond the scope of this study, a general approach is presented. Three possible factors were identified. Seismic activity is significant in the study area (up to 0.24 g [66]) and is considered a possible triggering factor.