Abstract: There is provided a new and useful tamping and topping plug for use in a seismic bore hole, and comprising a cylindrical body member having a forward and a rearward end and terminating at its forward end with a closed end part, a plurality of elongated members extending outwardly and rearwardly from at least one end and preferably from the forward and rearward ends of the body member, the members so arranged as to give the plug axial stability when inserted into a bore hole. There is also provided a process utilizing the plug for enhancing information available from seismic blasting.