Page 228 - Special Topic Session (STS) - Volume 3

STS541 Masao T. et al.
needed. The SBJ processed existing statistical data and provided appropriate
statistics to meet such needs.
Since it was difficult to conduct statistical surveys in the disaster-stricken
areas for several months after the disaster, the SBJ processed the existing
statistical data in combination with geographical information in the affected
areas and provided the results to local governments. For this process, the SBJ
was able to obtain information on the estimated range of tsunami-flooded
areas based on aerial photographs as additional geographical information.
Based on this, the SBJ processed a statistical map of the population and
number of households in the small area by the preliminary figures of the 2010
Population Census, which had already been made public, and began offering
them to local governments in the affected areas in March 2011. In April, in
order to provide them to more people, the SBJ published maps of the wide
area of the six prefectures of Aomori Prefecture, Ibaraki Prefecture, and Chiba
Prefecture in addition to the Tohoku Three Prefectures on the SBJ website. As
an example of such maps, Figure 1 shows the map of Miyagi prefecture.

Figure 1 Outline of inundation area in Miyagi prefecture and
the basic unit area population / number of households in the area

In response to requests from local governments in the affected areas,
special approximate tabulation of small areas for Tohoku Three Prefectures
was performed using the provisional questionnaire information for the “Basic
Complete Tabulation on Population and Households” and “Basic Complete

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