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We can define a number of relationships between
these factors. (1) The hazard has defined ranges of probabilities of
occurrence and of degree of impact. The interaction of probability and
impact allows prediction of a level of risk. (2) Changes in probability are
the largest driver for increased threat. However, increases in vulnerability
or in predicted impact while probability of occurrence is increasing will
significantly raise the threat level. (3) The relationship of impact and
vulnerability combined with pre-existing (such as the social, economic, or
political system) and post event (such as the efficacy of the response)
create consequences. (4) Eventually any risk can become a threat.
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