Everton Frigo^1,2, Jairo F Savian², Camila Trindade², Jerônimo de Ayala Rocha², Gelvam A Hartmann³, Ricardo IF Trindade⁴, Maria A Gomez Pivel², João Carlos Coimbra², Sandro Monticelli Petró² and Adriana Leonhardt⁵, (1)UNIPAMPA Federal University of Pampa, Cacapava Do Sul, Brazil, (2)UFRGS Federal University of Rio Grande do Sul, Porto Alegre, Brazil, (3)UNICAMP State University of Campinas, Campinas, Brazil, (4)Universidade de São Paulo, Geophysics, São Paulo, Brazil, (5)FURG Federal University of Rio Grande, Rio Grande, Brazil