1. Disaster Reduction and Mitigation against Typhoons

This database represents typhoon disasters with three basic components, namely, trigger, change, and damage. The advantage of factoring typhoon disasters is that disaster prevention and mitigation measures can be formulated in a clearer manner.

1. Measures for Trigger

One idea on disaster prevention measures for trigger is to destroy typhoons in the first place. In fact, this idea has been proposed for many years, and severl experiments had been carried out for controling typhoons (hurricanes). Namely, they scattered silver iodide from above the typhoon to force rainfall earlier to weaken the energy of the typhoon long before its landfall. Observations made during experiments indicated the weakening of the hurricane after scattering silver iodide. but they could not prove rigorously that the weakening was actually because of the effect of experiments.

Another problem, the unpredictability of control, became apparent from experiments. The first problem is who are responsible for the possible escalation of damage due to a sudden turn of the track, or intensification of the typhoon after the control. The second problem is who are responsible for the side effect of weakening typhoons. In fact, the huge amount of rainfall from typhoons are indispensable water resources for remote islands such as Okinawa, and moreover the rainfall from typhoons are blessing for solving the problem of water shortage all over Japan. If the control is too effective for weakening typhoons, and small amount of rainfall results in drought later, this raises another problem of responsibility.

In summary, the optimal control of typhoons for everyone is a virtually unsolvable problem. The appropriate decision could not be made. Hence we can conclude that the idea of destroying typhoons is an extreme disaster prevention measures based on the idea of putting nature under human's control.

2. Measures for Change

3. Measures for Damage

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