| 浅壳与上地幔地震的水平加速度谱阻尼修正系数模型 |
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| 引用本文： | 苏开潍,杨青松,梁基冠.浅壳与上地幔地震的水平加速度谱阻尼修正系数模型[J].地震学报,2019,41(6):778-794. |
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| 作者姓名： | 苏开潍 杨青松 梁基冠 |
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| 作者单位： | 中国成都610000 西南交通大学土木工程学院;中国成都610000 西南交通大学土木工程学院;中国成都610000 西南交通大学土木工程学院 |
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| 基金项目： | 国家自然科学基金（51578470）资助 |
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| 摘 要： | 对日本K-net和KiK-net台网中6 466条浅壳与上地幔地震动记录进行了统计分析，考虑四种场地类别分别建立了浅壳与上地幔地震的加速度谱阻尼修正系数模型，并利用随机效应模型将模型总残差分离为事件间残差、事件内残差（分为场地间残差和场地内残差），计算其相应的标准差，探究地震震源、路径、场地等因素对模型误差的影响。研究结果显示:所提出的模型能较好地拟合实际计算值，其随机误差整体随谱周期和阻尼比的增大而增大；震源效应导致的随机误差在谱周期小于2.0 s时小于其它效应；在大部分谱周期上，场地效应导致的随机误差小于路径效应及其它效应；事件间残差与震源和震源深度显著相关，场地内残差与震源距显著相关。
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| 关 键 词： | 浅壳与上地幔地震 阻尼修正系数 随机效应模型 震源效应 路径效应 场地效应 |
| 收稿时间： | 2019-03-15 |
Damping correction factor for horizontal acceleration response spectrum of shallow crustal and upper-mantle earthquakes |
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| Institution: | School of Civil Engineering，Southwest Jiaotong University，Chengdu 610000，China |
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| Abstract: | In this paper, 6 466 strong-motion records from 76 shallow crustal and 47 upper-mantle earthquakes in Japan were compiled to develop a damping correction factor （DCF） model. This study is aimed to provide a DCF that can be used to scale a design spectrum without known source and path parameters, therefore the models presented in this study did not include any terms for earthquake magnitude or source distance. Site effect on DCF was found to be significant, and a separate DCF model was constructed for the records from each of the four site classes. The total residuals were approximately separated into within- and between-event residuals, and the within-event residuals were further separated into within- and between-site components using a random effect model. Then the corresponding standard deviations were calculated to illustrate the variabilities associated with the source, path and site effects for the DCF model presented in this study. The results showed that the random errors tend to increase with spectral periods and damping ratios increasing, and the random errors associated with source effect are smaller than those associated with path and site effect at spectral periods less than 2.0 s. At most spectral periods, the random errors associated with site effect were smaller than those associated with path and other effects not explicitly modelled in this study. The between-event residuals are significantly correlated with magnitude and focal depth, while the within-site residuals were significantly correlated with source distance. Therefore, source and path parameters should be included for a model that can be used to scale a design spectrum from an earthquake with a known magnitude and source distance. |
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