Foreshock 3 : Natural Disaster. A small tremor that commonly precedes a larger earthquake or main shock by seconds to weeks and that originates in or near the rupture zone of the larger earthquake
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}