The concept of vulnerability was first presented in Chapter 1 and defined as a measure of the propensity of an object, area, individual, group, community, country, or other entity to incur the consequences of a hazard. As this section illustrates, measurement of vulnerability results from a combination of physical, social, economic, and environmental factors or processes. These factors are the primary determinant features that dictate how the likelihood and/or consequences components of risk are increased or decreased.
It is important to first clarify the difference between the concepts of vulnerability and exposure, which are often confused. The two words are used interchangeably to describe how a country, region, or community is likely to experience a certain hazard. However, this is incorrect, as the discussion on vulnerability factors shows. The United Nation’s risk reduction document Living with Risk embodies this concept, saying, “While most natural hazards may be inevitable, disasters are not” (ISDR, 2004).
Figure 3-9Figure 3-10While vulnerability defines the propensity to incur consequences, exposure merely suggests that the individual, structure, community, nation, or other subject will be exposed to the hazard. For instance, one might say, “The Spanish are vulnerable to drought,” meaning that Spain regularly experiences the drought hazard. But this statement implies more than the speaker intended. The use of the word “vulnerable” implies that the population is likely to incur negative consequences as a result of factors that make it less likely to protect its citizens and built and natural environments from harm, not simply that drought happens there. The reality, as Figures 3–9 and 3–10 illustrate, is that while Spain is regularly exposed to drought, the nation is not vulnerable to its consequences.
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