Mapping the influence of the deep Nazca slab on the geometry of the 660-km discontinuity beneath stable South America

Marcelo Belentani de Bianchi1, Marcelo Assumpcao1 and Jordi Julià2, (1)IAG-USP Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, Geophysics, Sao Paulo, Brazil, (2)UFRN Federal University of Rio Grande do Norte, Departamento de Geofísica, Natal, Brazil