Velocity (seismic) : The time rate of displacement of a reference point in an earthquake or the speed with which a particular seismic wave propagates in a rock
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, University of Utah Seismograph Stations UUSS, Glossary of Terms, Utah, USA 2012. http://www.seis.utah.edu/qfacts/glossary.shtml, (ND/ Erthq - Amer) {166}