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介绍了基于有限断层震源的地震动随机合成中静力学拐角频率和动力学拐角频率,讨论了两者的缺点;进而提出了一种改进的震源谱模型,它能够表达破裂面上地震波频率辐射不均匀性、大震时拐角频率随破裂面积增加而有所下降的趋势.据此,可以形成与该震源谱模型相关联的动力学拐角频率,应用于地震动的随机合成,避免结果对子源尺寸的依赖.通过对美国北岭MW6.7地震近场6个基岩台站合成的地震动与实际记录的比较,验证了本文方法的有效性.
The static corner frequencies and dynamic corner frequencies of stochastic seismic ground motions are introduced based on the finite fault source. The disadvantages of the two are discussed. An improved source spectrum model is presented, which can express the frequency of the seismic wave on the rupture surface Uniformity and the trend that the corner frequency decreases with the increase of rupture area.Accordingly, the dynamic corner frequency associated with this source spectral model can be formed and applied to the random synthesis of ground motion to avoid the effect on the source Size dependence of the seismic data.A comparison between the ground motion and the actual records of 6 bedrock stations near the North China MW75 earthquake in the North of China confirms the effectiveness of the proposed method.