Abstract
A study on damaged or undamaged small earth dams for irrigation in Aomori and Akita prefectures by Nihonkai-Chubu Earthquake in 1953 was carried out by distributing relevant questionnaires. A total of 1129 data on the irrigation dams were used for analysis. The irrigation dams were classified into three groups, such as heavy-damaged dams (A), light-damaged dams (B) and undamaged dams (C). The ranks of seismic damage in the dams were investigated by the Type II Quantification Analysis based on the available data, which has been frequently used in Japan for statistical analyses including not only quantitative data but also qualitative data. As the results of analysis, 8 items were selected from 27 items as the factors greatly affecting the earthquake damage of a small earth dam. Weighting factors were given to items so as to discriminate the heavydamaged group from the undamaged group including light-damaged dams as clearly as possible.
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