【摘要】 本文提出一个不依赖于地震相似性关系的用小震记录合成大震记录的半经验方法。该方法考虑了大、小地震应力降等震源参数的差异。在用Brune模型的远场S波谱对小震记录进行修正时还引入一个谱的经验标定因子K(ω)。本文使用这一方法,用一个M_L=4.2的余震记录和一个M_L=4.3的小震记录,合成了1982年10月19日河北卢龙地震(M_L=5.3)12~#、3~#、7~#台站的加速度时程。合成结果与观测记录的对比表明,它们的峰值、持时、包线形式和从0.3—15Hz的较宽频带范围的加速度反应谱都符合较好。12~#台的合成结果还表明,通过调整经验标定因子K(ω),可以使合成结果较好地拟合大震观测记录的反应谱。更多还原

【Abstract】 In this paper an improved empirical Green function method is suggested, which is not based on similarity relations of earthquakes.In this method the differences of source parameters, such as stress drop Δσ, etc. between main shock and small shock are considered. An empirical spectrum scaling factor K(ω) is introduced when far-field shear wave spectrum of Brune model is used to modify small earthquake records. By means of this method, the accelerograms at station 3, 7, 12 in the Lulong Earthquake (ML = 5.3) are synthesized by using an ML=4.2 aftershock record and an ML = 4.3 small shock record as Green functions. It is shown that the synthesized motions show a good agreement with the observed ones in the frequency range from 0.3-15Hz, and K(ω) can be adjusted to make the response spectra of synthesized acceleration agree well with the observed ones.更多还原