北京和云南剑川地区的Qpsub> 和 Qssub>
QP AND Qs IN BEIJING AND JIANCHUAN, YUNNAN AREAS
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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.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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[1] Aki, K., and P. Riehards, Quantitatiae Seismology, Theory and Jlethods, 1, 167, W. H. Freeman, San Francisco, 1980.
[2] 陈运泰、林邦慧、李兴才、王妙月、夏大德、王兴辉、刘万琴、李志勇,巧家、石棉小震震源参数的测定及其地展危险性的估计,地球物理学报,19,206——233, 1976,
[3] 林邦慧、李志勇、魏富胜,京津地区Q值及平均应力降的分布特征,地球物理学报,25, 344——351, 1982.
[4] 周克森,小震震源机制解的联合测定,地震学报,3, 237——253, 1985,
[5] Anderson, D. L., and R. S. Hart, The Q of the Earth, J. Geophys. Res., 83, 5869——5882, 1978.
[6] 王培德,一种新型的地震仪—DCS——302数字磁带记录地震仪,地震科学研究,3, 62——64, 1981.
[7] Wang, P. D., L. Y. Song, and F. T. Wu, Near field seismic observation with a mobile little aperture network, Proceedings of International Workshop on Earthgtsake Engineering, A——20, 1——15, 1984
[8] Brune, J. N., Tectonic stress and the seismic shear waves from earthquake, J. Geophys. Res., TS, 4997——5009, 1970.
[9] Bakun, W. H., and C. G. Bufe, Shear wave attenuation along the San Andreas fault zone in central California, Bull. Seirm. Soc. Tmer., 65, 439——459, 1975.
[10] Peng, K, Z., F. T. Wu, and L. Y. Song, Attenuation characteristics of peak horizontal acceleration in Northeast and Southwest China, Earthquake Engineering and Structural Dynamics, 13, 337——350, 1985.
[11] Institute of Geophysics, State Seismological Bureau, Btdletin of Seismological Observation of Chinese Stationr, 1976, Seismological Press, Beijing, China, 1982.[1] Aki, K., and P. Riehards, Quantitatiae Seismology, Theory and Jlethods, 1, 167, W. H. Freeman, San Francisco, 1980.
[2] 陈运泰、林邦慧、李兴才、王妙月、夏大德、王兴辉、刘万琴、李志勇,巧家、石棉小震震源参数的测定及其地展危险性的估计,地球物理学报,19,206——233, 1976,
[3] 林邦慧、李志勇、魏富胜,京津地区Q值及平均应力降的分布特征,地球物理学报,25, 344——351, 1982.
[4] 周克森,小震震源机制解的联合测定,地震学报,3, 237——253, 1985,
[5] Anderson, D. L., and R. S. Hart, The Q of the Earth, J. Geophys. Res., 83, 5869——5882, 1978.
[6] 王培德,一种新型的地震仪—DCS——302数字磁带记录地震仪,地震科学研究,3, 62——64, 1981.
[7] Wang, P. D., L. Y. Song, and F. T. Wu, Near field seismic observation with a mobile little aperture network, Proceedings of International Workshop on Earthgtsake Engineering, A——20, 1——15, 1984
[8] Brune, J. N., Tectonic stress and the seismic shear waves from earthquake, J. Geophys. Res., TS, 4997——5009, 1970.
[9] Bakun, W. H., and C. G. Bufe, Shear wave attenuation along the San Andreas fault zone in central California, Bull. Seirm. Soc. Tmer., 65, 439——459, 1975.
[10] Peng, K, Z., F. T. Wu, and L. Y. Song, Attenuation characteristics of peak horizontal acceleration in Northeast and Southwest China, Earthquake Engineering and Structural Dynamics, 13, 337——350, 1985.
[11] Institute of Geophysics, State Seismological Bureau, Btdletin of Seismological Observation of Chinese Stationr, 1976, Seismological Press, Beijing, China, 1982.
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