Abstract: A human-portable geophysical energy source is disclosed having an earth-coupling element, a means for providing seismic energy operably connected to that earth-coupling element, a lower container and an upper container connected to the means for providing seismic energy, a framework that minimizes vibrations of the liquid by keeping the upper and lower containers inflexible when they are completely filled with liquid, and a hydraulic pump for filling and removing liquid from the containers. The lower container is located spatially between the earth-coupling element and the means for providing seismic energy. The upper container is located spatially above the means for providing seismic energy. The liquid provides mass to impart energy through the earth-coupling element and to maintain coupling with the earth.

Abstract: A seismic exploration system where a plurality of geophone locations are employed in one spread along a survey line. The recording procedure uses a roll-along switch for successively connecting a lesser number of recording channels to the geophone locations as separate records are taken without changing the spread. A signal is superimposed at one of the geophone locations. The signal is outside the useful range of seismic energy so that the particular geophone location may be identified on successive records without interfering with the recording of the seismic energy.