Field observations after 921 earthquake show that the irregular basement has serious damage because of amplification of ground motion.
在921地震后，经观察发现，半开挖式地下室结构损毁情形大部分比全开挖式结构严重。
Researching the influence of local irregular topography on ground motion is one of the most important problems in earthquake engineering.
研究地震时局部地形对地面运动的影响是地震工程学的重要课题之一。
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