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对地震工程来说,地震产生的加速谱的有效上界频率f_(max)。是一个重要的参数。由于受到震源,传播途径和数据采集点特性的影响或者上述因素的综合影响,有时f_(max)是很模糊的或矛盾的。Brune依据观察到的强震纪录的一般特性,在加速谱中引进了一个大约为10H的截频。Ida认为截频与震源效应有关,以此估算出他的滑动弱化模型中临界滑移量约为10厘米。在作了适当修正后,Day在进行地震断层破坏三维模拟中也采用了相近的临界弱化滑
For seismic engineering, the effective upper bound of the acceleration spectrum produced by earthquakes f_ (max). Is an important parameter. F_ (max) is sometimes vague or contradictory due to the influence of source, route of transmission and characteristics of data collection points or the combined effect of the above factors. Based on the observed general characteristics of strong earthquake records, Brune introduced a cutoff of about 10H in the acceleration spectrum. Ida considers the cutoff to be related to the source effect, and estimates the critical slip in his slip-weakened model to be about 10 cm. After appropriate corrections, Day also adopted a similar critical weakening in the three-dimensional simulation of seismic fault damage