GAO LONGSHENG, SHI RUBIN, HUA ZHENGXING, LI RUIXUANcom mult. 1986: THE Q-FACTORS AS A FUNCTION OF FREQUENCY IN THE TANGSHAN-BEIJING AREA. Acta Seismologica Sinica, 8(4): 354-366.
Citation: GAO LONGSHENG, SHI RUBIN, HUA ZHENGXING, LI RUIXUANcom mult. 1986: THE Q-FACTORS AS A FUNCTION OF FREQUENCY IN THE TANGSHAN-BEIJING AREA. Acta Seismologica Sinica, 8(4): 354-366.

THE Q-FACTORS AS A FUNCTION OF FREQUENCY IN THE TANGSHAN-BEIJING AREA

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  • Published Date: August 31, 2011
  • Making use of the records of the Frequency Selective Seismographs in the Tangshan-Beijing area, the apparent Q-factor around every station has been obtained by means of the single station method. To form the combined envelops of codas from several records at the same station this paper proposed the relation △lnA= 1.73△M, where △Mis the difference between the measured magnitude and the normalized reference magnitude as a relatively rigid criterion of compensation to substitute the method of estimate by the eye. Thus more reasonable combined envelops of codas have been constructed, which provide the apparent Q-factors as the statistical representation for a certain area around the station. The variation of Q-factor versus frequency has also been reconfirmed as Q-Qof, where Qo is the Q-factor at 1 Hz, f is the frequency, is a constant which is related to a certain area. It can be noticed that even though there is quite a remarkable difference in Qo among stations in this area under study, for instance, Qo min=122 at Shacheng and Qomax=292 at Madaoyu, the s are almost the same, around 0.6, for five out of the six stations, with Taishitun as the only exception. This shows that the physical substance of the attenuation around these stations can be taken as quite similar. As a statistical result for the whole Tangshan-Bijing area, the overall average of Q-factor at 1 Hz is Q0=189.It is consequently noticeable that in reporting any Q-factor in the range of 1-40 Hz, one has to consider the fact that the Q-factor is strongly dependent on frequency.
  • [1] Aki, K., and P. G. Richards, Quantitative .irismology, W. H. Freeman and Co., 1980.

    [2] Gutenberg, B., Attenuation of seismic waves in the earth's mantle, Bull. Seism. Soc. Am., 48, 269——282, 1958.

    [3] Sipkin, S. A., and T. H. Jordan, Frequency dependence of Qscs, Bull. Seism. Soc. Am., 69, 1055——1079, 1979.

    [4] Aki, K., Analysis of the seismic coda of local earthquakes as scattered waves, J. Geophys. Res., 74, 615——631, 1969.

    [5] Zapolskii, K. K., The Frequency Selective Seismograpli Station CHISS in Experimental Seismology, Nauk Publishing House, Moscow, 20——36, 1971, (in Russian).

    [6] Tsujiura, M., Regional variation of P wave spectra, Bull. Earthquake Res. lart., Tokyo Univ., 47, 613——633, 1969.

    [7] Rautian, T. G., and V. I. Khalturin, The use of coda for determination of the earthquake Source spectrum, Bull. Seism. Soc. Am., 68, 923——948, 1978.

    [8] Tsujiura, M., Spectral analysis of the coda waves from local earthquakes, Bull. Earthqttckr Res. Inst., Tokyo Univ., 53, 1——48, 1978.

    [9] Roecker, S. W., B. Tucker, J. King, and D. Hatzfeld, Estimates of Q in central Asia as a function of Erequency and depth using the coda of locally recorded earthquakes. Bull. Seism. Soc. Am., 72, 129——149, 1982

    [10] Pulli, J. J., Attenuation of coda waves in New England, Bull. Seism. Soc. Am., 74, 1149, 1984.

    [11] Aki, K., B. Chouet, Origin of coda waves, source, attenuation, and scattering effects, J. Geophys. Res, 80, 3322——3342, 1975.

    [12] Aki, K., Scattering and attenuation of shear waves in the lithosphere, J. Geophys. Res., 85, 6496——6504

    [13] Gao, L. S, N. N. Biswas, L. C. Lee, and K. Aki, Effects of multiple scattering on coda waves in threedimensional medium, PAGEOPH, 121, 3——15, 1983.

    [14] Gao Longsheng, Hua Zhengxing, and Li Ruiettan, The estimation of the mean free path of S——waves under the Beijing area, Geophysical Research, edited by Editorial Office of Geophys. Res., Inst. of Geophys., State Seismological Bureau, 1985.

    [15] Sato, H., Energy propagation including scattering effects, single isotrr, pic scattering approximation, J. Phys. Earth, 25, 27——41, 1977.

    [16] Fedotov, F. A., and S. A. Boldyrev, Frequency dependence body wave., absorption in the crust and upper mantle of the Kuril Island Chain, Izv. Earth Phvs., 9, 17——33, 1969.

    [17] Sato, H., Attenuation of S waves in the lithosphere due to scattering by its random velocity structur}0_, J. Geophys. Res., 87, 7779——7785, 1982.

    [18] 靳雅敏, 陈运泰, 于新昌, 唐山地震余震的震源参数及地壳介质的品质因素, 地震学报, 4, 62——67, 1982.

    [19] 林邦慧, 吴诗芬, 高则民, 宁河地震烈度明显偏低的探讨.地球物理学报, 22, 14——24, 1979.

    [20] 付昌洪, 朱传镇, 北京及其邻区Q值分布特征的研究, 西北地震学报, 2, 11——22, 1980.

    [21] Peishan Chen, Otto W. Nuttli, Wenhua Ye, and Jiazheng Qin, Coda waves for earthquakes of the Beijing and Yunnan Regions of China, estimates of sliort——period Q values and seismic moments. Bull. Seism. Soc. Am. 74, 1189, 1984.

    [1] Aki, K., and P. G. Richards, Quantitative .irismology, W. H. Freeman and Co., 1980.

    [2] Gutenberg, B., Attenuation of seismic waves in the earth's mantle, Bull. Seism. Soc. Am., 48, 269——282, 1958.

    [3] Sipkin, S. A., and T. H. Jordan, Frequency dependence of Qscs, Bull. Seism. Soc. Am., 69, 1055——1079, 1979.

    [4] Aki, K., Analysis of the seismic coda of local earthquakes as scattered waves, J. Geophys. Res., 74, 615——631, 1969.

    [5] Zapolskii, K. K., The Frequency Selective Seismograpli Station CHISS in Experimental Seismology, Nauk Publishing House, Moscow, 20——36, 1971, (in Russian).

    [6] Tsujiura, M., Regional variation of P wave spectra, Bull. Earthquake Res. lart., Tokyo Univ., 47, 613——633, 1969.

    [7] Rautian, T. G., and V. I. Khalturin, The use of coda for determination of the earthquake Source spectrum, Bull. Seism. Soc. Am., 68, 923——948, 1978.

    [8] Tsujiura, M., Spectral analysis of the coda waves from local earthquakes, Bull. Earthqttckr Res. Inst., Tokyo Univ., 53, 1——48, 1978.

    [9] Roecker, S. W., B. Tucker, J. King, and D. Hatzfeld, Estimates of Q in central Asia as a function of Erequency and depth using the coda of locally recorded earthquakes. Bull. Seism. Soc. Am., 72, 129——149, 1982

    [10] Pulli, J. J., Attenuation of coda waves in New England, Bull. Seism. Soc. Am., 74, 1149, 1984.

    [11] Aki, K., B. Chouet, Origin of coda waves, source, attenuation, and scattering effects, J. Geophys. Res, 80, 3322——3342, 1975.

    [12] Aki, K., Scattering and attenuation of shear waves in the lithosphere, J. Geophys. Res., 85, 6496——6504

    [13] Gao, L. S, N. N. Biswas, L. C. Lee, and K. Aki, Effects of multiple scattering on coda waves in threedimensional medium, PAGEOPH, 121, 3——15, 1983.

    [14] Gao Longsheng, Hua Zhengxing, and Li Ruiettan, The estimation of the mean free path of S——waves under the Beijing area, Geophysical Research, edited by Editorial Office of Geophys. Res., Inst. of Geophys., State Seismological Bureau, 1985.

    [15] Sato, H., Energy propagation including scattering effects, single isotrr, pic scattering approximation, J. Phys. Earth, 25, 27——41, 1977.

    [16] Fedotov, F. A., and S. A. Boldyrev, Frequency dependence body wave., absorption in the crust and upper mantle of the Kuril Island Chain, Izv. Earth Phvs., 9, 17——33, 1969.

    [17] Sato, H., Attenuation of S waves in the lithosphere due to scattering by its random velocity structur}0_, J. Geophys. Res., 87, 7779——7785, 1982.

    [18] 靳雅敏, 陈运泰, 于新昌, 唐山地震余震的震源参数及地壳介质的品质因素, 地震学报, 4, 62——67, 1982.

    [19] 林邦慧, 吴诗芬, 高则民, 宁河地震烈度明显偏低的探讨.地球物理学报, 22, 14——24, 1979.

    [20] 付昌洪, 朱传镇, 北京及其邻区Q值分布特征的研究, 西北地震学报, 2, 11——22, 1980.

    [21] Peishan Chen, Otto W. Nuttli, Wenhua Ye, and Jiazheng Qin, Coda waves for earthquakes of the Beijing and Yunnan Regions of China, estimates of sliort——period Q values and seismic moments. Bull. Seism. Soc. Am. 74, 1189, 1984.
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