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日本为了有效地利用国土,正在研究把大型的、重要的结构建于地下。这样做,从抗震来讲是有利的,因为地下结构物比地上结构物所受到的地震力要小。为摸清地下结构物的抗震优点,日本在城山地下水电站洞室进行了地震观测,先后观测到71个地震,其中有代表性的地震是1978年1月14日12时25分的伊豆大岛近海地震(M=7.0)和1978年6月12日17时16分的宫城县冲地震(M=7.4)。经过整理、分析,得到以下几个有参考价值的结论:1.地下200米处的最大加速度与地上最大加速度之比在1/3～1之间,其中大都集中在1/2
In order to effectively use the land, Japan is studying the construction of large-scale and important structures underground. In doing so, it is advantageous in terms of earthquake resistance because underground structures receive less seismic forces than ground structures. In order to understand the seismic advantages of underground structures, Japan conducted seismic observations at the underground cave of the Chengshan Underground Hydropower Station, and observed 71 earthquakes in succession. Among them, the representative earthquake was Izu Oshima at 12:25 on January 14, 1978. Inshore earthquakes (M=7.0) and Mt.Cheng earthquakes at 17:16 on June 12, 1978 (M=7.4). After finishing and analysis, the following conclusions have been made: 1. The ratio between the maximum acceleration at 200 meters below ground and the maximum acceleration above ground is between 1/3 and 1, most of which are concentrated in 1/2.