A hypothesis was made that risk follows a multiplicative function (formula 1):
(1)R= H fr ⋅Pop ⋅ Vul (Blaikie, P. (et al.) (1996): At Risk: Natural Hazards, Peoples Vulnerability and Disasters, Routledge, London and New York)
Where:
R = number of expected human impacts [killed/year].
Hfr= frequency of a given hazard [event/year]
Pop = population living in a given exposed area [population affected/event].
Vul = vulnerability depending on socio-economic factors [no units]
or formula 2 R = PhExp ⋅ Vul
Where:
R = risk of human losses
Vul = population vulnerability
PhExp = average number of people exposed to a hazard type by year (Burton, I., Kates, R.W., White, G.F (1993): The Environment as Hazard, Second Edition, Guilford Press, New York/London.)
I believe that the final data could be divided by the response time and additional resources that have been received. What do you think?