The invention is an electric sweep type seismic vibrator source of the type used in seismic prospecting for hydrocarbons. The source uses an engine and generator combination to create electric power for all systems on the source such as driving a frame of linear electric motors that direct a rod or piston to contact the ground in a recurring fashion along with driving the source from location to location through a survey area. The seismic source further includes an active isolation system that provides for significant weight on the ground through the rods of the linear electric motors, but protects the vehicle body and the remainder of the systems on the seismic source to be insulated from the harshest vibration related to the acoustic energy being applied to the ground. The active isolation system may include reactive elements such as pneumatic and hydraulic shock absorbers, but also includes active elements such as linear motors operated to counteract the impulsive forces from conveying through the frame of the seismic source.