Focus 6 : That point within the Earth from which originates the first displacement of an earthquake and radiation of its elastic waves. See also: Hypocenter
Christian Nerger and Johannes Schweitzer (Assisting Editor in Compiling), Glossary of Terms Frequently Used in Seismology and Observatory Practice, US Geological Survey (http://www.usgs.gov/), the Montana Bureau of Mines and Geology (http://www.mbmg.mtech.edu/) and the International Data Center of the CTBTO (http://www.ctbto.org), USA 2004. http://gfzpublic.gfz-potsdam.de/pubman/item/escido c:4141:2/component/escidoc:4142/Glossary_rev1.pdf% 3Bjsessionid=216960F299E7DC5292AAE080C9BACFB3, (ND/ Erthq - Amer) {25}
Natural and Environmental Disaster Information Exchange System NEDIES, European Commission, Directorate General Joint Research Centre (DG JRC), Institute for the Protection and Security of the Citizen (IPSC), Ispra (Varese) Italy, http://nedies.jrc.it/index.asp?ID=82#Top, US Geological Survey (USGS), Earthquake Hazards Program, Glossary of Earthquake and Related Terminology, USGS/Cascades Volcano Observatory, Vancouver, Washington, Washington, USA 2012. http://vulcan.wr.usgs.gov/Glossary/Seismicity/eart hquake_terminology.html, (ND/ Erthq - Amer) {165}
