South America, surface waves, geodynamics, tomography, tectonophysics, Earthquakes, Magma, Velocity, Topography, Lithosphere, Seismic activity, Noise, Spatial discrimination, Slopes (topography), Earth, Perturbation methods, Seismic velocities, Plateaux, Mantle, Oceanic crust, Topography (geology), Sea level, Moho, Uplift, Upper mantle, Ambient noise, Wave v...