ABSTRACT

Spatial correlations of peak ground and pseudo spectral acceleration are estimated as a function of intersite separation distance and natural vibration periods. More than 2286 three-component records from 461 Iranian earthquakes are employed to evaluate the intra-event residual correlation based on multiple earthquakes, considering both local and regional ground motion prediction equations (GMPEs). A correlation analysis is carried out through semivariogram as a powerful geostatistical tool. The results show the overall trend of correlation range increases as a function of structural period that appear consistent with previous researches. The average decay of correlation in Iran is slightly more rapid than that of California.

摘要

峰值地面和伪谱加速度的空间相关性被估计为站点间分离距离和自然振动周期的函数。考虑到局部和区域地震动预测方程 (GMPE)，使用来自 461 次伊朗地震的超过 2286 条三分量记录来评估基于多次地震的事件内残差相关性。通过半变异函数作为强大的地统计工具进行相关性分析。结果表明，相关范围的总体趋势随着结构时期的增加而增加，这与以往的研究结果一致。伊朗相关性的平均衰减速度略快于加利福尼亚。