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Disaster may be defined as an event, concentrated in time and space,
which threatens a society or a relatively self sufficient sub division of a
society with major unwanted consequences as a result of the collapse of
precautions which had hitherto been culturally accepted (Turner, 1976).
Hazard and disaster are closely related. ... A hazard is a natural event
while the disaster is its consequence. A hazard is a perceived natural event
which threatens both life and property.... a disaster is the realization of this
hazard.... (John Whittow, Disaster, 1980).