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基于汶川地震64个余震强震动记录数据,结合NGA衰减关系模型以及一维场地非线性反应模型,应用基于最大可能性估计的统计算法,对峰值加速度、峰值速度、峰值位移以及不同周期的加速度反应谱进行了衰减关系研究。得到了汶川地震区基岩场地以及各类土层场地的地震动衰减关系。与其他人的研究成果对比,表明NGA模型衰减关系估计的基岩场地地震动相对较低,而估计的土层场地地震动相对较高。
Based on the recorded data of 64 aftershocks of the Wenchuan earthquake and the statistical model of the maximum likelihood estimation based on the model of NGA attenuation and the one-dimensional nonlinear response model, the peak acceleration, peak velocity, peak displacement and acceleration responses of different periods Spectral attenuation relationship study. The relationship between the ground motion attenuation and the bedrock of Wenchuan earthquake area is obtained. Compared with the research results of other people, it shows that the ground motion of bedrock ground is relatively low estimated by the decay relation of NGA model, and the ground motion of the estimated soil layer is relatively high.