Critically Examine the View that Natural Hazards Appear to be Occurring with Increasing.
Sarah Lee 13L 26th March
Critically Examine the View that Natural Hazards Appear to be Occurring with Increasing Frequency
Firstly, I think that it is important to define what a ‘natural hazard’ actually is. John Whittau describes it as,
‘A hazard is a perceived natural event that threatens life and property’
‘A disaster is the realisation of this hazard’
A widely accepted definition characterizes natural hazards as "those elements of the physical environment, harmful to man and caused by forces extraneous to him" More specifically the term "natural hazard" refers to all atmospheric, hydrologic, geologic (especially seismic and volcanic), and wildfire phenomena that, because of their location, severity, and frequency, have the potential to affect humans, their structures, or their activities adversely.
There is evidence to suggest that the frequency of such natural hazards is increasing. Reported disasters between 1960’s and 1980’s which Blaikie et al collated in1994 showed a definite trend of an increase in the frequency of natural hazards. For example, in 1960’s there was one avalanche classified as a natural disaster but in 1970’s this number increased to 4 and this number increased four fold again to make 16 avalanches classed as ‘natural hazards’ in the 1980’s. Another obvious trend is that the number of volcanoes in a twenty year period is appearing to almost double – 13 in 1960’s, 25 in the 1970’s and 55 in the 1980’s. In fact, the total of natural hazards in 1960’s (including epidemic, drought/famine, avalanche, wind storm, flood, volcano, landslide and earthquake) was only 23.7% of the natural disasters occurring in the 1980’s.
Below I will examine three well-known natural disasters that are increasing in frequency and suggest how human activities may exasperate them thus increasing their numbers.
Floods