Fig.1: General view of the proposed S wave source. The mechanical wheel is coupled to a electrical DC motor. After the motor has been supplied with 24 Volts, by manual triggering on the green Button, the device is immediately stopped by a electro-mechanic circuit breaker thus generating a short duration impulse. The asymmetric placement of the lead mass potentiates the shear impulse through the soil/source coupling and dampens the system after the torque is applied. The picture depicts the final position of the wheel and the lead mass.