Proceedings of the 12th International INQUA meeting on paleoseismology, active tectonic and archaeoseismology

494 PATA Days 2024 15 g of quartz sand with two different grain sizes: Sand 1 (fine- grained) and Sand 2 (coarse-grained) as shown in Table 1, each with different flow capacities when released with the addition of 26 ml of water. Following these baseline tests, the release of the alluvial material with containment elements, or in some cases with material removal, is carried out in three different configurations positioned on the slopes of the hill, beneath which are the houses exposed to landslides at a distance of 140 m, which in analogue scaling corresponds to 14 cm. The baseline profile was constructed based on the simplification of real heights and slopes, emphasizing its 32° slope as it represents the steepest to simulate the worst-case scenario (Fig. 2). Fig. 2: Lo Rojas hill profile (shadow upper section) and its simplified section for analogue experimentation. The test profile configuration aimed to limit the mobility and advancement of material by adding different types of containment elements (pink in Fig. 3) and, in some cases, by removing material (yellow in Fig. 3): Profile A involves intervening in the terrain of the slope by adding vertical containment elements to slow down the runout of rockfall and/or fluids caused by precipitation or earthquakes. Profile B is a case where, in addition to adding containment elements at 90° similar to Profile A, material is also removed from the slope, with the hypothesis that these areas will serve to contain a significant volume of material in the event of a landslide. Finally, Profile C involves adding containment elements with an inclination angle of 60°, generating, without the removal of material, a larger area than Profile A for the containment of a significant volume of material in case of landslide. Fig. 2: Lo Rojas hill profile (shadow upper section) and its simplified section for analogue experimentation.