Calamity 2 : "A massive or extreme catastrophic disaster that extends over time and space". The Black Death of the 14th century as an example. (Drabek 1996)
Institute for Crisis, Disaster, and Risk Management (ICDRM), - ICDRM/GWU Emergency Management Glossary of Terms, The George Washington University (GWU), Washington, DC, USA 2010. http://www.gwu.edu/~icdrm/publications/PDF/GLOSSAR Y%20-%20Emergency%20Management%20ICDRM%2030%20JUNE %2010.pdf, (Emr Mgt - Amer) {797}
The Institute for Crisis, Disaster, and Risk Management (ICDRM) at the George Washington University (GWU), Emergency Management Glossary of Terms, Washington, D.C., USA 2007. http://www.gwu.edu/~icdrm/publications/PDF/GLOSSAR Y%2002-19-2007.pdf, (Emr Mgt/ Crisis, Dzstr and Rsk - Amer) {478}