Because Japan is on the western extremity of the Pacific Ocean and on a typhoon route, every year several typhoons strike and much flood damage is suffered. Japan is also a country where earthquakes frequently occur. On a map of the epicentres of earthquakes occurring in the world, so many occur in Japan that its whereabouts can not be seen. The area of plains in Japan comes to not much more than 10% of the total area, and since cities grow on the estuaries of swift rivers, topographically too there is proneness to flood damage, and also to damage from tidal waves. Since Japanese cities are densely populated and wooden house building has been common since ancient times, as regards city structure also there is typically a great danger of damage from fire. If the storage of information in Japan, prone as it is to disasters in terms of meteorology, geography and urban structures, does not take account of flood, fire and earthquake damage, then storage policy can hardly be called adequate.
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