Introduction
Countries around the world have developed safety policies in order to avoid victims and damage after disasters (Ale et al., 2006). In general, safety policies are based upon the concept of risk. Kaplan & Garrick (1981) defined risk as a combination of the frequency of the undesired event and the consequence of the event. Several investigators have found that risk is influenced by a number of different variables including safety measures, kinetic energy released by said event, the domino effect, vulnerability and population density (Adams et al, 2005; Dao & Peduzii, 2004; Thomalla & Schmuck, 2004; Thompson et al., 2001 Aarts & Schagen, 2006; Rappaport, 2000).
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