Earthquake 19 : Natural Disaster. An earthquake is a series of vibrations on the earth's surface caused by the generation of elastic (seismic) waves due to a sudden rupture within the earth during release of accumulated strain energy
National Disaster Management Authority NDMA, National Disaster Management Guidelines, Management of Landslides and Snow Avalanches, Glossary of Terms, New Delhi, India 2009. http://nidm.gov.in/pdf/guidelines/new/landslidessn owavalanches.pdf, (ND/ Lndsld - Brit) {921}