Disaster 031 : "A disaster is an unusually severe and/or extensive event that usually occurs unexpectedly and has such a severe impact on life and health of many people and/or causes considerable
Katharina Thywissen, Components of Risk: A Comparative Glossary (No. 2/2006), United Nations University Institute of Environment and Human Security (UNU-EHS), ISBN: 3-9810582-0-8 (printed version), ISBN: 3-9810582-1-6 (electronic version), Bonn, Germany 2006. http://www.ehs.unu.edu/file/get/8335, (Dzstr, Rsk, Vul, Haz, etc. - Amer) {796}