[Society of Exploration Geophysicists and Brazilian Geophysical Society 12th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 15-18 August 2011 - Rio de Janeiro, Brazil (15 August to 18 August)] 12th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 15–18 August 2011 - SBP 3.5, 7,10kHz, Chirp (0.5-2.0kHz), Chirp (2-12kHz), Chirp (10-18 kHz), Boomer (0.5-2 kHz) e Sparker (0.1-1.0kHz): quando decidir por uma ou por outra fonte acústica?