市町村単位でみた地震時被災・復旧プロセスの要因分析 : 第2報 1982年浦河沖地震の応急・復旧対策

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タイトル別名
  • FACTOR ANALYSIS ON EARTHQUAKE DISASTERS AND RESTORATION IN MUNICIPAL UNITS : Part II:Post-countermeasures and restoration processes in the 1982 Urakawa-oki earthquake
  • 市町村単位でみた地震時被災・復旧プロセスの要因分析-2-1982年浦河沖地震の応急・復旧対策
  • シチョウソン タンイ デ ミタ ジシンジ ヒサイ フッキュウ プロセス ノ ヨ

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A series of studies exploring major factors influencing1 earthquake disasters from direct to indirect, immediate countermeasures, and restoration processes is made for all municipalities damaged in the 1982 Urakawa-oki earthquake, Hokkaido, Japan. A continuation of the factor analysis in the previous paper on earthquake disaster occurrence, this paper proceeds deals with the post-earthquake countermeasures and subsequent restoration processes, so as to elucidate how the administrative organization of municipalities were actually involved. The major results obtained are summarized as follows. i) The number of municipalities in which post-earthquake countermeasures were carried out increases with increasing seismic intensity from IV to VI in the JMA scale. The seismic intensity as an index of the severity of earthquake input seems to control the priority in the adoption and execution sequence of countermeasures, such as emergency calls for municipality staff, orders for evacuation of the affected areas, setup of the headquarters, and supply of water and food to the affected population. ii) The time length necessary for the restoration of the physical damage to the structures of residential houses and commercial buildings is well correlated with the degree of the individual damage. As is expected, their restoration duration becomes longer with increasing seismic intensity. Contrary to this, in life line functional systems such as electricity and water supply the necessary time for restoration is affected not only by the seismic intensity but also by the actual number of damaged facilities in the area, because they are repaired under a restriction of a limited number of available laborers. From this series of studies it is clear that the earthquake disasters in city areas are much more complicated than those in less populated town and village areas and therefore the restoration in city areas takes a longer time, it should be kept in mind that the sophisticated functional systems convenient in everyday life in city areas make earthquake damage complicated and their recovery prolonged.

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