谭景阳^{1, 2}，胡进军^{1, 2}，周旭彤^{1, 2}，杨泽西^{1, 2}，谢礼立^{1, 2}
AuthorsHTML:谭景阳^{1, 2}，胡进军^{1, 2}，周旭彤^{1, 2}，杨泽西^{1, 2}，谢礼立^{1, 2}
AuthorsListE:Tan Jingyang^{1, 2}，Hu Jinjun^{1, 2}，Zhou Xutong^{1, 2}，Yang Zexi ^{1, 2}，Xie Lili^{1, 2}
AuthorsHTMLE:Tan Jingyang^{1, 2}，Hu Jinjun^{1, 2}，Zhou Xutong^{1, 2}，Yang Zexi ^{1, 2}，Xie Lili^{1, 2}
Unit:1. 中国地震局工程力学研究所，哈尔滨 150080；
2. 中国地震局地震工程与工程振动重点实验室，哈尔滨 150080
Unit_EngLish:1. Institute of Engineering Mechanics，China Earthquake Administration，Harbin 150080，China；
2. Key Laboratory of Earthquake Engineering and Engineering Vibration，China Earthquake Administration，Harbin 150080，China
Abstract_Chinese:为了研究海底地震动特性及其不确定性，本文基于日本K-net海底地震动，经过数据筛选、地震动分类、滤波以及基线调整，对典型地震动参数和弹塑性谱进行了研究．通过分析震源类型、震级和距离对地震动参数及频谱变异系数的影响，讨论了海底地震动的不确定性．结果表明：随距离和震级的增大，其对幅值的影响逐渐减弱；震级因素对持时的影响高于距离因素；距离较小时其对阿里亚斯强度的影响较大，距离较大时其对阿里亚斯强度的影响小于震级的影响．海底地震动动力放大系数谱峰值大于抗震规范值；震源类型主要影响地震动弹性反应谱的长周期段，震级和距离主要影响长周期弹性反应谱的不确定性．对于浅地壳、板缘和板内地震，弹塑性反应谱不确定性的影响则体现在短周期段．通过与未分类的海底地震动变异系数的比较发现，按震级、距离与震源类型对海底地震动分组之后统计不确定性明显降低．
Abstract_English:To study the characteristics and uncertainties of seafloor ground motions，the ground motion on the seafloor recorded by the Japanese K-net is collected and classified in this paper. Typical ground motion parameters and elastic-plastic spectra are analyzed after filtering and the baseline adjustment for the classified ground motion records. The uncertainty of ground motion on the seafloor is discussed by ground motion parameters and the coefficients of variation of spectra for different source types，magnitudes，and distances. The results show that：the influence on amplitude parameters decreases with the distance and magnitude increasing；the influence on duration of the magnitude is greater than that of the distance；it has a much influence on the Arias intensity for short distance，while the influence on the Arias intensity is less than that of the magnitude for long distance. The peak values of the dynamic amplification factor spectra of ground motions on the seafloor are greater than those of the seismic design standard；the source types mainly influence the elastic response spectra for long periods，the magnitude and distance mainly affect the uncertainty of the elastic response spectra for long periods. The influence of the uncertainty of the elastic-plastic response spectra is mainly reflected in short periods for shallow crustal，subduction interface and subduction slab earthquakes. When comparing the coefficients of variation of the unclassified ground motions on the seafloor，the statistical uncertainty of classified earthquake groups by magnitude，distance and source types are significantly reduced.
Keyword_Chinese:海底地震动；地震动参数；弹性反应谱；等强度延性谱；不确定性
Keywords_English:seafloor ground motion；ground motion parameters；elastic response spectra；constant-strength ductility spectra；uncertainty

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