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中文摘要：
通过对一个现有建筑的结构动态参数的辨识讨论了土与结构的相互作用。目标建筑是建于1998年的8层的型钢混凝土结构。在此研究中,8自由度的模型被建立以分析微震观测数据,随即,非参数和参数技巧以辨识此结构的自然频率,阻尼率和层硬度等。在考虑土-结构相互作用和不考虑土-结构相互作用的两种情况下,分别辨识结构的参数并对比结果以证实其对辨识结果的影响。在文中非参数方法包括众所周知的传递函数和随机减量法,参数方法是非线性的系统辨识工具ARX（Auto-Regression with extra input）方法。
英文摘要：
The authors attempt to consider the effect of soil-structure interaction by identifying the dynamic parameters of an existing building.Target building is an 8-story steel encased reinforced concrete building,which was constructed in 1998.In the study,an eight-degree-of-freedom analytical model is utilized to analyze the data from microtremor measurement.Then,nonparametric and parametric techniques are employed to determine natural frequency,damping ratio and story stiffness of the structure.For these two cases,one is without considering the effect of soil-structure interaction;the other is with considering the effect of soil-structure interaction.Comparing the results of these two cases,the effect of soil-structure interaction can be confirmed.Nonparametric methods include the well known transfer function and random decrement method.The parametric method employed herein is the off-line system identification method ARX（Auto-Regression with extra input）.
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3-D multi-step travel time tomography: Imaging the local, deep velocity structure of Rabaul volcano,
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