Disaster risk reduction (DRR, or disaster reduction) is an umbrella term for processes of preparing for, responding to, recovering from, and managing the risk of disasters. It refers primarily to the acts of setting the policy and strategic agendas for these tasks. It reflects a long-standing need to reorientate priorities from merely responding to disasters once they have struck to reducing or avoiding their impacts. To be achieved, DRR requires a combination of physical and social measures, with full participation of affected populations and other stakeholders.
Academically, disasters have been studied systematically for more than 100 years. During this period, the emphasis has changed from analyzing natural hazards as the primary drivers of disaster to a more pluralistic approach in which vulnerability and exposure to hazards and threats are viewed as playing vitally important roles. Disasters can have natural, technological, social, or intentional (i.e., terrorism-related) causes, but they are increasingly composite events that involve combinations of factors. Hence there is now much emphasis on “natech” events, in which natural hazards affect technological systems, and cascading disasters, in which escalation points caused by interacting sources of vulnerability may have the power to make the secondary effects more important than the primary trigger. Root causes and contexts have assumed a greater salience in the explanation of disaster, which tends to involve complex interactions among social, economic, political, and physical factors. Resilience has come to the fore as a positive concept for organizing processes of DRR. It is usually defined as a mixture of adaptation to hazards and threats and the ability to resist or overcome the negative effects of disaster.
DRR concepts and strategies have been mainstreamed in modern society by international action under the auspices of the United Nations and the Sendai Framework for DRR, 2015–2030. The challenges of applying UN frameworks include uncertainty about whether the underlying concepts are durable, whether they can be applied rigorously, whether they have enough support among policy and decisionmakers, and whether they can acquire a sound practical basis. The future of DRR depends on humanity’s ability to implement solutions to conflict, migration, and environmental change, not merely the impact of disasters per se. In an era in which population is rising, wealth disparities and human mobility are increasing, and environmental change has begun to lead to major upheavals, DRR has gone from being a rather esoteric, specialized field to one that is central to the future of human existence.
Recent occurrences of serious tsunami damage and the future challenges of tsunami disaster risk reduction