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

134 PATA Days 2024 A N A L O G M O D E L S The designed device consists of a 1 m x 1 m glass surface onto which two wooden walls, each 15 cm wide and 1 m long, were fixed at opposite ends with a separation of 1 m (Fig. 2). One of these walls was firmly anchored to restrict the movement of the sand during compression. The other wall is mobile and attached to a piston, which in turn is connected to an electric gear motor that generates piston movement to induce simple compression. At the base of the mobile wall, a 1 m x 35 cm aluminum plate was fixed perpendicular to it. This plate creates a velocity discontinuity (VD), marking where the layer separation and deformation localization will occur (Malavielle, 1984; Balé, 1986; Allemand et al., 1989; Ballard, 1989). Upon this device, a stratified sequence of white and colored sand is mounted to facilitate the later recognition of deformation. The 12th International INQUA Meeting on Paleoseismology, Active Tecton October 6 th -11 th , 2024, Los Andes, C Fig. 2: Schematic of the device used for analog modeling with the mounted sand sequence and respective dimensions. Fig. 3: Sect significant s tectonic se sand), alon simultaneou white and b sand used for experimentation was previously sieved to have a grain size <500 μm, with an internal friction angle calculated at 35°, and lacked the cohesion to meet scaling criteria. Upon completion of sand deposition, the result is a cake-like structure measuring 3.4 cm in height, 65 cm in width, and 1 m in length (Fig. 2). Three types of experiments were designed, with the variable used being the syntectonic sedimentation rate. The first is a simple compressionwithout sedimentation, a comparative baseline. The second involves complete sedimentation, where sedimentary material is deposited over the entire area of the pre-tectonic sequence, except in the area representing the orogenic core. The third experiment corresponds to segmented sedimentation, in which the setup is divided into two zones: a southern zone with sedimentation and a northern zone without sedimentation. Fig. 2: Schematic of the device used for analog modeling with the mounted sand sequence and respective dimensions.