Evolutionary power spectral density of strong-motion earthquakes
Evolutionary power spectral density of strong-motion earthquakes
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DOI：
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发表时间：
1970-06
影响因子：
3
通讯作者：
S. C. Liu
中科院分区：
文献类型：
--
作者：
S. C. Liu
摘要 本文提出了六次强震的演化（时间相关）功率谱密度曲线。地震加速度图被视为分段可分离，并且通过应用均方最小化准则来估计与频率无关的调制函数。结果表明，随着时间的增加，地震的功率谱密度在震级和频率轴上的峰值位置上都会发生变化。分析表明，可以通过简单的计算程序合理地评估地震的非平稳特征，由此获得的信息有助于开发改进的地震模拟随机模型。
Abstract This paper presents the evolutionary (time-dependent) power spectral density curves of six strong-motion earthquakes. The earthquake accelerograms are treated as piecewise-separable and the frequency-independent modulating function is estimated by applying the mean square minimization criterion. The results show that, as the time increases, the power spectral densities of earthquakes can vary both in magnitude and in peak location over the frequency axis. The analysis demonstrates that the nonstationary characteristics of earthquakes can be reasonably assessed by a simple computation procedure and the information thus obtained can be helpful in developing improved stochastic models for earthquake simulation.