Trains, planes, & fishing boats: a geophone sensor for underwater acoustics


  • D.M.F. Chapman Defence Res. Establ. Atlantic, Dartmouth, NS, Canada


oceanographic equipment, seismometers, underwater sound, ocean acousticians, hydrophones, pressure sensors, very-low-frequency measurements, seabed, transducers, geophones, velocity sensors, shear waves, underwater acoustic experiments


Usually, ocean acousticians use hydrophones (i.e. pressure sensors) for very-low-frequency measurements, either placed on the seabed or suspended in the water. Occasionally, they use transducers that sense the particle velocity associated with the acoustic wave in the water. Some investigators have been using geophones (i.e., velocity sensors) coupled to the seabed itself. Geophones measure the motion at the seabed, which can be different from that in the adjacent water mass. In particular, geophones-unlike hydrophones-can sense the propagation of shear waves in the seabed. Seismologists have been using geophones in their Ocean Bottom Seismometer (OBS) packages for years. The author describes the configuration, testing, and calibration of an OBS for underwater acoustic experiments




How to Cite

Chapman D. Trains, planes, & fishing boats: a geophone sensor for underwater acoustics. Canadian Acoustics [Internet]. 1992 Sep. 1 [cited 2021 Dec. 4];20(3):61-2. Available from:



Proceedings of the Acoustics Week in Canada