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用在一个地震台接收到的同一个震源区内较小地震的振幅谱去除大震的振幅谱,可求得大震震源的频谱在两个拐角频率之间的趋势的斜率.利用 Q 值在0.0001—100Hz 之间几乎是常数的特性,用试错法对大震的振幅谱因衰减造成的高频损耗进行补偿.当补偿后的高频趋势的斜率与频谱比的高频趋势的斜率接近时,便表示所选取的 Q 值是适宜的.用这种方法,我们得到云南剑川地区的 Q_p 等于900,Q_s 等于400.而北京地区的 Q_p 等于800,Q_s 等于550.
Using the amplitude spectrum of a minor earthquake in the same source region received by a seismic station to remove the amplitude spectrum of a large earthquake, the slope of the trend of the frequency spectrum of the major earthquake source between the two corner frequencies can be found. Using Q 0.0001-100Hz is almost constant between the characteristics of the trial and error method for the amplitude of the large earthquake attenuation caused by the high frequency loss compensation when the slope of the high frequency trend after compensation and the slope of the high frequency trend of the spectrum ratio close , It means that the selected Q value is suitable.In this way, we get the Q_p of 900 in Jianchuan area, Yunnan, Q_s is equal to 400. In Beijing, Q_p is equal to 800 and Q_s is equal to 550.