中文摘要：

以2013年4月20日四川MW6．7级芦山地震强震动记录为基础数据，分析美国下一代衰减关系项目NGA—West1与NGA—West2两组模型在该地区的适用性。选用断层距200km以内42个台站的主震记录为样本，拟合地震动峰值加速度和典型周期加速度反应谱的衰减关系，对比芦山地震观测数据与NGA模型预测值的差异。结果表明，2组NGA模型整体上均轻微低估了小于0．2S的短周期处加速度反应谱值，而在大于1S的长周期处则存在明显的高估现象；NGA—West2模型在短周期处离散性比NGA—West1模型有所改善，长周期处的残差略有降低。

英文摘要：

The Mw6.7 Lushan earthquake on April 20, 2013 provided the opportunity to validate the applicability of American Next Generation Attenuation Relationship（NGA-West 1 and NGA-West 2 model）. A total of 42 free-field strong-motion recordings within the rupture distance of 200 km were used in this study. Firstly we established an empirical attenuation relationship for the peak ground acceleration and spectral acceleration. The residuals analysis shows that the model can properly reflect the attenuation tendency of the parameters. It was found that the NGA models underestimate the parameters slightly in short period less than 0.2 s, overestimate significantly in long period over I s. Compared with the NGA-West 1 model, the NGA-West 2 model not only performs better for the discreteness of short period spectral acceleration, but also reduces the residuals in long period