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

118 PATA Days 2024 SEISMIC TOMOGRAPHY: The survey collected data in the study area by following a slope with a 7-degree inclination (Fig. 2A). 25 geophones were placed along a 70-meter seismic line, each at a distance of 3 meters and an approximate depth of 5 cm (Fig. 2B). The geophones used had a frequency of 4.5 Hz and use a sampling time of 0.250 ms. We fired 25 shots at 3-meter intervals between geophones using the Geometrics ES-300 equipment. This seismic line was denoted AB. The seismic data was processed using modules from the Seisimager software. Initially, the Pickwin module was employed to visualize the initial signals recorded by the seismograph and to generate curves known as dromochrones through manual data selection (Fig. 4A). Fig. 2: Study Area. The Digital Elevation Model (DEM) illustrates elevation variations across the terrain, using a color gradient from dark blue (lower elevations) to red (higher elevations). The red line represents the trace of the Porotoyacu Fault identified in this study, while the black line indicates the fault trace proposed by the SARA Project. Insets show two topographic profiles that capture changes in elevation along the fault line, with red arrows denoting where the fault trace intersects the profiles. B) Seismic Line AB Design. This panel shows a schematic representation of the seismic line AB on the ground, laid out along a topographic profile. The red triangles symbolize the distribution of geophones along the seismic line, while the black stars mark the start and end points of the slope.