| 截止频率的取值对地震动空间相干函数统计结果的影响 |
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| 引用本文： | 丁海平,罗翼,饶威波,朱越.截止频率的取值对地震动空间相干函数统计结果的影响[J].地震学报,2018,40(5):664-672. |
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| 作者姓名： | 丁海平 罗翼 饶威波 朱越 |
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| 作者单位： | 中国江苏苏州 215001 苏州科技大学土木工程学院 |
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| 基金项目： | 国家自然科学基金项目（51678383）资助 |
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| 摘 要： | 以SMART-1台阵第45号地震的南北分量加速度作为研究对象，计算截止频率fcut分别为8，16和24 Hz，台站间距分别为200，1 000和2 000 m这9种工况的相干系数，并进行曲线拟合，再根据9组拟合参数计算相应的相干系数并进行比较。结果表明:① 截止频率fcut的取值对相干函数统计模型参数和相干系数拟合曲线有很大影响；② 根据较小的截止频率fcut得到的拟合参数计算出的相干系数随频率的衰减很快，反之，根据较大的截止频率fcut得到的拟合参数计算出的相干系数随频率的衰减较慢；③ 当使用由确定的截止频率fcut得到的相干系数拟合参数计算超出截止频率fcut范围的相干系数时，将产生很大的误差。
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| 关 键 词： | SMART-1台阵 地震动空间相关性 相干系数 截止频率 曲线拟合 |
| 收稿时间： | 2017-10-16 |
The influence of cut-off frequency on the statistical results of spatial coherency function of seismic ground motion |
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| Affiliation: | School of civil engineering，Suzhou University of Science and Technology，Jiangsu Suzhou 215001，China |
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| Abstract: | Based on the north-south component of the 45th seismic record on the SMART-1 station, in this paper, we firstly calculated the lagged coherencies under nine conditions which were combined with the three cut-off frequencies （8, 16, 24 Hz） and three separation distances （200, 1 000, 2 000 m）. Then, we fitted the curves. Finally, the coherencies received according to nine groups of fitting parameters were compared. The conclusion can be drawn as follows: ① The selection of the cut-off frequency fcut has great effect on the parameters of coherence function model and lagged coherency fitting curves. ② The lagged coherency calculated by the fitting parameters which obtained by smaller cut-off frequency fcut decays rapidly with increasing frequency; on the other hand, the lagged coherency calculated by the fitting parameters which obtained by larger cut-off frequency fcut decays slowly with increasing frequency. ③ Great errors will be produced when using fitting parameters of the lagged coherency that got from the determined cut-off frequencyfcut to calculate the lagged coherency beyond that frequency range. |
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