Inverse-Square Law 1 : A relation between physical quantities of the form: x is proportional to 1/y2 . y is most usually a distance and the x's are of two kinds, forces and fluxes
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}