During the last decade risk analysis has emerged as an effective and comprehensive procedure to guide the overall societal response to, and management of disasters. Risk analysis is carried out to reduce (a) casualties from potential disasters, (b) disruption to the economic and social activities, and to mainstream (c) the culture of safety in all activities undertaken by city and national governments. It became part of decision making in sectors such as health care, environment, physical infrastructure systems, to cite a few.