| 北京和云南剑川地区的Qpsub> 和 Qssub> |
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| 引用本文： | 吴大铭,王培德,陈运泰.北京和云南剑川地区的Qpsub> 和 Qssub>[J].地震学报,1987,9(4):337-346. |
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| 作者姓名： | 吴大铭 王培德 陈运泰 |
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| 作者单位： | 1. 美国宾厄姆顿纽约州立大学地球科学系
2. 中国北京国家地震局地球物理研究所 |
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| 摘 要： | 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 Qp 等于900,Qs 等于400.而北京地区的 Qp 等于800,Qs 等于550.
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| 关 键 词： | 品质因子 强地面运动 震源谱 拐角频率 衰减 水平向峰值加速度 |
QP AND Qs IN BEIJING AND JIANCHUAN,YUNNAN AREAS |
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| Institution: | 1. Department of Geological Sciences and Environmental Studies, State University of New York, Binghamton, New York 13901, U. S. A.;
2. Institute of Geophysics, State Seismological Bureau |
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| Abstract: | Events of December 1982 in Huairou County, Beijing, and of July 1982 in Jianchuan, Yunnan were recorded at one station in Beijing City and at four stations in Eryuan area, Yunnan respectively. Dividing the spectra (for P and S waves) of the large events in the series by the spectra (for corresponding P and S waves) of the smaller events in each region, we have determined the high frequency source spectral decay rate to be -2 in both cases. Through trial and error method, we are able to determine the appropriate constants QP and Qs that correct the in dividual spectra to the proper high frequency decay-rate. It is found that a QP of 800 and Qs of 550 can adequately compensate for the attenuation of the waves in Beijing area. For the Jianchuan area, Yunnan the corresponding values are 900 and 400. |
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