A system and method are disclosed for exploring a subsurface region that contains a target sector of interest. The method comprises providing information about the harmonic response for the target sector of interest and a seismic source. The method comprises controlling the seismic source to provide seismic waves in a narrowband selected on the basis of the information about the harmonic response for the target sector of interest. The method comprises activating the seismic source so as to introduce seismic waves into the subsurface sector and sensing reflections of the seismic waves at a seismic receiver.