Based on the results of field surveys, coastal dike failures caused by the Great East Japan Earthquake were classified into eight patterns. The results of hydraulic model experiments related to major failure patterns reinforced the proposed failure processes. In addition, the aggregated length of each failure pattern showed that failure from scouring at the landward toe is the dominant failure pattern.
Questionnaire surveys were conducted in the Kushiro City on factors related to evacuation from the Chilean-Earthquake tsunami in February 2010. The factors related to evacuation were veryfied by covariance structural analysis. Although only a small percentage of respondents thought their residence would be flooded or that they would die if they did not evacuate, 42% of respondents actually evacuated. For both respondents who evacuated and those who did not, concern about flooding had a significant influence on intention to evacuate. However, knowledge of the tsunami warning and of the evacuation advisory was not related to concern about flooding.
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