Lucas Vieira Barros¹, Marcelo Assumpcao², Juraci Carvalho¹ and Brandow Neri³, (1)Seismological Observatory of the University of Brasília, Brasilia, Brazil, (2)IAG Institute of Astronomy, Geophysics and Atmospheric Sciences, Sao Paulo, Brazil, (3)UNB University of Brasilia, Asa Norte, Brazil