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序言人们普遍把强地面运动的持续时间当作地面振动的一个重要特性。早先的研究者如 Bolt,Trifunac 和 Brady 以及Vanmarcke 和 Lai 等的工作都表明,确定
Preface It is common to regard the duration of strong ground motion as an important feature of ground vibration. Previous work by researchers such as Bolt, Trifunac and Brady, and Vanmarcke and Lai et al.