1978年宮城県沖地震被害調査報告 : 土木関係を主として

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気象庁の発表によれば,宮城県を中心として被害を発生させた今回の地震は1978年6月12日17時14分に起こり,そのマグニチュードは7.4,震源の位置は北緯38°O9'東経142°13',深さ約40kmであった.筆者らは,地震発生直後早速現地に赴き,主として土木構造物の被害を調査してきたので以下にその概要を報告する.The Miyagi-Ken Oki earthquake of M=7.4 occurred on June 12, 1978 and consequently brought some damage particularly in Sendai city and its urban area. This report describes the earthquake-induced damage on the various types of civil engineering and associated structures: ・ Road and highway structure ・ Railways ・ Ports and harbors ・ Water supply systems and sewerage structures ・ Electric power and communication systems ・ Gas supply systems ・ Oil tanks ・ Ground liquefaction ・ Landslides and land-failures ・ River embankments The following characteristic features of the damage due to the earthquake are: 1. Sendai city was attacked by the earthquake of 1936 which is similar to this earthquake of June 12, 1978 with respect to the magnitude and the epicenter. However, the level of the damage by this earthquake is found much higher than that of the previous one. This can be attributed to the fact that civil engineering structures and home-dwellings are constructed in the recently developed urban areas where ground conditions are poor. Most of the damage can be seen in such areas. 2. A high correlation between the ground conditions and the damage, especially to the lifeline structures, is observed 3. Lifeline structures such as water, gas, and electric supply systems mostly lost their functions due to the earthquake, and people were subject to inconveniences. For example, it took 27 days to rehabilitate the whole gas system in Sendai city. Some considerations of aseismicity for these lifeline structures and also of the rehabilitation of them are pre- sented in this report.
1979-12-25

著者

伯野元彦
Professor Of Civil Engineering Toyo University

1978年宮城県沖地震被害調査報告 : 土木関係を主として

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