以反应谱和功率谱密度函数表征的强震运动的统计特性

The Statistical Characterization of Strong Ground Motion Specified by Response Specturm and Power Spectral Density Function

文中利用我国海城和唐山地震１９０条强震记录和美国西部１３８条强震记录研究了以反应谱和功率谱密度函数表征的强震运动的统计特性。反应谱用最大地面加速度归一化，即表为谱放大系数，功率谱密度函数用金井清谱描述。文中研究了参数的统计值和依赖性，以及谱放大系数和金井清谱参数与场地条件、震源和震中距等之间的相关性，分析比较了中美两国强震运动谱的统计特性，并对我国地震工程应用的强震运动谱的统计参数值的选取提出了建议。

The statistical characterization of strong ground motion specified by response spectrum and power spectral density function is studied by using 190 strong-motion records of the Haicheng and Tangshan earthquakes of China and 138 events of the Western United States. The response spectrum is normalized by the peak ground acceleration, i. e. represented as spectral magnification factor, and the power spectral density function is described by the Kanai-Tajimi spectrum. The statistics and dependencies of parameters are evaluated. And correlations between the spectral magnification factor or Kanai-Tajimi spectral parameters and the site conditions, epicentral distance or local magnitude are investigated. The statistical characterization of spectra between China and USA is compared. Based on the results obtained the values of statistics of spectral parameters applied for earthqake engineering in China are recommended.