## 2 Study Area  
The study was conducted at a site located in the Laguna del Amor area, southeast of the city of Chota (Cajamarca, Peru), at an altitude between 2423 and 2622 m.a.s.l. (Figure 1). This area includes a road reconstructed after the landslide occurred in 2021, as well as a set of cracks filled by material dragged due to weathering and erosion processes caused by runoff. These cracks delimit the main fracture of the landslide, in addition to the presence of houses within the danger zone associated with the event, along with several stationary lagoons, including the Laguna del Amor, which gives its name to the area. For the geophysical evaluation, Electrical Resistivity Tomography (ERT) measurements were used in 2D and pseudo 3D configurations, applied due to the difficulty of the terrain not allowing parallel ERT profiles. Four profiles were designed and analyzed: the first one was plotted along the longitudinal axis of the landslide in the SE-NW direction, following the identified direction of the avalanche movement (Figure 2), while the remaining three were plotted in NE-SW transverse directions to obtain a detailed model of the affected area. For the selection of the field profiles, a photogrammetric survey was carried out in addition to a field reconnaissance in order to identify the areas that would provide the most information for the ERT profiles. The predominant slope in the area varies between 0% and 15% (Figure 2). In the study area, stationary lagoons, a creek at the foot of the landslide, cracks, inclined trees, geological formations, and geomorphological units of the site can be observed. The landslide in the Laguna del Amor area has an SE-NW direction (Figure 3), whose morphology and orientation suggest an active process due to the presence of tension cracks in the upper crown and at the foot of the landslide slope. In addition, the creek that erodes the foot of the slope Figure 4b,f,h, with jump heights in the escarpment or main landslide crown of between 10 to 15 m, describes a well-defined fault zone. These conditions, together with the topography of the site, helped to define the positioning of the electrodes of the ERT equipment (Figure 3). The cracks located in the crown and foot of the landslide present considerable openings, indicating the instability of the terrain, being the consequence of accumulated tensional forces, generating differential displacements in the material (Figure 5) and allowing the infiltration of water, in turn increasing the weight and the hydrostatic pressure in the interior of the sliding mass. The stationary lagoons found near the intersection of ERT 3 and ERT 1 of the lagoon can only occur if there is a clay formation that impedes the flow of  
Figure 1: Location map of the study area. (**a**) Digital height map obtained by DEM photogrammetry of the Laguna del Amor area. Visualizing light blue water bodies, red lines as escarpments or landslide crowns, purple lines as access roads, yellow lines as stress cracks, and yellow polygons as houses built in the study area. (**b**) Location map of Cajamarca in Peru. (**c**) Location map of Chota district in Chota province/(**d**) City of Chota located in the district of Chota, (**e**) Study area located near the city of Chota. water into the terrain, a process that should occur naturally, considering the irregularities of the terrain; the presence of the Laguna del Amor is explained by the existence of a horizontal water table that supplies the lagoon throughout the year, implying that there is a continuous flow of water near the lagoon; the formations present (d and e) located (300 m) northwest and southwest of the Laguna del Amor explain the presence of these materials and the slide, since these are made up of clayey-loamy materials and limestone rocks, which are soluble in water. The presence of these morphological elements suggests that the landslide has advancing kinematics and could undergo acceleration under adverse precipitation or seismic conditions.