著者

伯野 元彦 大谷 圭一

出版者

東京大学地震研究所

雑誌

東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo (ISSN:00408972)

巻号頁・発行日

vol.57, no.3, pp.581-608, 1983-01-17

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The Urakawa-Oki earthquake of M=7.1 occurred on March 21, 1982 and consequently cause some damage to small towns in the south part of Hokkaido. This report describes the earthquake-induced damage to the various types of structures and life lines: Houses and buildings, Roads, Railways. Water supply systems, Electric power and communication systems, Landslides and land failures. The following characteristic features of the damage due to the earthquake are recognized, 1. Wooden houses on soft peat ground suffered damage owing to the destruction of the peat ground itself. On the other hand, reinforced concrete buildings on soft peat ground always have a deep pile foundation and suffered almost no damage. Authors suppose the peat layer to be so soft that it acts like a high cut filter and high frequency components of the incident ground motion which are the main components of high acceleration, is reduced. 2. Most lifeline systems such as water, electric supply systems, and traffic, lost their functions due to the earthquake, and people were subjected to inconveniences. For example, it took 30 days to rehabilitate the railway traffic in this area.