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本文比较了汶川地震、芦山地震时在基岩和土层场地观测台站所取得地震动记录的加速度反应谱和基于日本强震动观测数据得出的基岩加速度反应谱衰减公式、场地反应谱放大系数评估公式的计算结果,发现两者的衰减特征基本一致。通过拟合观测反应谱及其与衰减公式的残差,推算了各地震观测站整体的平均场地参数。结果表明,汶川地震和芦山地震观测台站的整体平均剪切波速VS30相当于500 m/s左右,这与大多数的观测台站位于山地这一地形特征较为吻合。本文还推测了六个观测站的场地参数。
In this paper, the acceleration response spectra recorded by ground motions obtained from observation stations in bedrock and soil layers during the Wenchuan Earthquake and Lushan Earthquake, and the attenuation formula of acceleration response spectrum of bedrock derived from strong earthquake motion data in Japan are compared. The site response spectrum is magnified Coefficient evaluation formula calculation results, found that the attenuation characteristics of the two basically the same. By fitting the observed response spectrum and the residuals of the attenuation formula, the average site parameters of all the seismic stations are calculated. The results show that the average shear wave velocity VS30 of Wenchuan Earthquake and Lushan Earthquake Observation Station is equivalent to about 500 m / s, which is in good agreement with the terrain feature of most observation stations located in the mountainous area. The article also speculates on the site parameters of the six observatories.