A sudden and usually unforeseen event that calls for immediate measures to minimize
its adverse consequences. (UN DHA). Emergency is a term describing a state. It is a
managerial term, demanding decision and follow-up in terms of extra-ordinary
measures (Oxford Pocket Dictionary, 1992).A "state of emergency" demands to "be
declared" or imposed by somebody in authority, who, at a certain moment, will also lift
it. Thus, it is usually defined in time and space, it requires threshold values to be