Electronic apparatus for geophysical prospecting, namely, seismic sensor unit; sound recording apparatus for geophysical prospecting; measuring apparatus for geophysical prospecting, namely, particle motion sensor, seismometers, hydrophones, accelerometers; electronic hardware for ground seismic prospecting, namely, seismic vibration control devices and devices for sensing seismic signals, preprocessing seismic signals, converting these signals into digital information, recording digital info...