1923年関東地震による木造建物被害数が混乱する原因

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Four different regional damage data sets have been left for the 1923 Kanto earthquake. Two data sets were stored in Reports of the Imperial Earthquake Investigation Committee and the other two data sets in Taisho Kanto Earthquake Damage Report of the Ministry of Home Affairs. The reason why these data sets often gave some large different numbers of damage houses was investigated through the survey of the origin of data and the comparison of the numbers summed up from each data set for major cities and prefectures. Then three major causes were found for confusing the damage data. The mixture of different unit data was indicated as the first cause. Some data sets show the number of collapsed buildings, which summed up not only for dwelling houses but also for non-dwelling houses, while the others show the number of households living the collapsed buildings. The second cause for the confusion occurred at the city area such as Tokyo and Yokohama, where some households lived in one house building. Therefore, the number of households was usually more than the number of house buildings. The third reason also existed in the city area where the conflagration occurred. Some data summed up the collapsed buildings both in burned district and in nonburned district. But the others summed up only in non-burned district in order that overlapping account of collapsed and burned buildings was avoided. For example, the difference of the number of totally collapsed buildings due to each cause was estimated to be more than 20000, respectively.
2001-05-30

1923年関東地震による木造建物被害数が混乱する原因

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