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

Fig. 1: Study case where the areas to be evaluated in case of a tsunami and/or mass removal triggered by an earthquake are highlighted. S T U D Y C A S E The study case corresponds to the coastal urban area of Coronel, Bio Bio region, Chile (37°S), as it presents a high exposure to the risk of storm surges and tsunamis in the event of earthquakes, due to its location and morphology. Furthermore, earthquakes are one of the main triggers for mass movements, and in this specific zone, an area prone to avalanches, rockfalls, and alluvial deposits has been identified (SHOA, 2022). In this context, Wassaf (2023) presents in their study a strategy and design for both the construction of resilient housing for vertical evacuation during tsunamis, and an alluvial mitigation park on the slopes of the characteristic hill of Lo Rojas, Coronel, which will also serve as a tsunami evacuation route (Fig. 1). A N A L O G U E M O D E L S Analogue models are a very useful tool due to their ability to simplify nature. By dynamically, kinematically, and mechanically scaling the models (Hubbert, 1937), they become directly comparable to natural analogues. In analogue experiments with emphasis on the upper crust materials, the preferred analogue is generally quartz sand, which behaves according to the Mohr-Coulomb failure criteria (e.g. Lohrmann et al., 2003; Buiter & Schreurs, 2006). The analogue experimentation in this study is conducted with the aim of recognizing the runout of the simulated landslide. Initially, a model is created to examine the behaviour of two different materials corresponding to analogue alluvial material. In this case, we tested Fig. 1: Study case where the areas to be evaluated in case of a tsunami and/or mass removal triggered by an earthquake are highlighted.