Heave 02 : (1) The motion imparted to a floating body by wave action. It includes both the vertical rise and fall, and the horizontal transport. (2) The up and down motion of the center of gravity of a ship.
Intergovernmental Oceanographic Commission IOC technical series 37, Tsunami Glossary (A glossary of terms and acronyms used in the tsunami literature - English), , United Nations Educational, Scientific and Cultural Organization UNESCO, Paris, France 1991. http://unesdoc.unesco.org/images/0008/000885/08853 8eb.pdf, (ND/ Tsunami Sci - Brit) {590}