## 7 Conclusions  
In this work, a landslide with an approximate area of 65,000 m\({}^{2}\) in Guaramales (Ecuador) has been analyzed. One and two-dimensional type geophysical surveys of seismic and electrical methods have been jointly implemented. Specifically, five VES surveys (used as control points) were performed at the same position as the other five HVSR single-station measures. Three seismic profiles (refraction and MASW types) were carried out at different elevations in the landslide area to complement the geophysical surveys. These techniques were used to confirm and perform the final analysis model in a total of 22 HVSR point measures. At the parametric control points, the thicknesses of the sliding materials (those that exhibit shallow lower resistivity and seismic velocity values) were defined from those of the compact substrate (considered fixed, with higher geophysical values). The empirical relationship obtained from VES points results related to soft sediments thickness correlated with the natural frequencies values of the ground \(f_{o}\) (obtained from HVSR surveys executed at control points). The empirical Equation (3) obtained has an \(a\) factor of 31.039 and a \(b\) factor of \(-\)0.351, with an adjustment error of R\({}^{2}\) = 0.932, which is considered a good correlation value. From this Equation (3), the sediment thicknesses have been calculated and contoured on an isopach map using the values obtained at the different points from the measured HVSR stations. On those map results, several sections of the terrain can be executed (longitudinal, oblique, and transversal ones, considering the direction of the material slide). These sections have shown the existence of a deeper area V-shaped with steep flanks. This deep sedimentation could be related to a possible fault structure affecting the metamorphic basement. The potential slip rupture surface, with a translational or roto-translational-type shape, has been proven to be related to the separation between soft materials (shallow sediments) layered over the basement (considered as fixed material). Complementarily, the \(K_{g}\) vulnerability index value analysis related to ground shear strain shows two prone areas to be the potential to continue the movement. These areas are in the exact location where emergency constructions were made to keep the integrity of the affected road. The methodology in combining VES-type and HVSR-type surveys in investigating surface sediments showing in an impedance contrast (over 2.2) in defining sedimentary sliding material overlying the fixed basement has been verified. This methodology is easy, quick to apply and interpret, and has low economic costs. It can be transferred to other areas with access to complicated drilling machinery and as a tool prior to more elaborate or expensive economic surveys, considering the conditions (definition of contrast values in geophysical parameters). The use of VES and HVSR techniques, and the methodology developed in this research, can be an investigation and decision-making tool in the monitoring and instrumentation of slippery zones caused by the speed of execution of the surveys and their economy. Based on these results, it would be convenient to establish a complementary research campaign through bore-hole drilling with core recovery to establish the conditions of the materials and verify what was exposed in this investigation. **Author Contributions:** Conceptualization, O.A.-P. and F.J.T. ; methodology, O.A.-P.; software, O.A.-P.; validation, O.A.-P., J.G.-R. and A.G.; formal analysis, O.A.-P. and F.J.T. ; investigation, O.A.-P. and F.J.T. ; resources, O.A.-P. and F.J.T. ; data curation, O.A.-P. and A.G.; writing--original draft preparation, O.A.-P.; writing--review and editing, J.G.-R. and F.J.T. ; visualization, O.A.-P. and A.G.; supervision, J.G.-R. and F.J.T. All authors have read and agreed to the published version of the manuscript. This research received no external funding. Not applicable. All data and processing results are under request.