Depth of Seismic Hypocenter : In seismology, the vertical distance from the bottom of the ocean or from the surface of the earth to the point within the earth that is the center of an earthquake. See: Seismic Focus
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}