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GAO LONGSHENG, HUA ZHENGXING, LI RUIXUANcom sh advanc. 1987: ESTIMATION OF MEAN FREE PATH OF S-WAVES UNDER BEIJING AREA BY MEANS OF BOTH INTENSITY AND DECAY OF CODAS. Acta Seismologica Sinica, 9(4): 347-363.
Citation: GAO LONGSHENG, HUA ZHENGXING, LI RUIXUANcom sh advanc. 1987: ESTIMATION OF MEAN FREE PATH OF S-WAVES UNDER BEIJING AREA BY MEANS OF BOTH INTENSITY AND DECAY OF CODAS. Acta Seismologica Sinica, 9(4): 347-363.
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ESTIMATION OF MEAN FREE PATH OF S-WAVES UNDER BEIJING AREA BY MEANS OF BOTH INTENSITY AND DECAY OF CODAS

  • Institute of Geophysics, State Seismological Bureau

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  • Published Date: September 01, 2011
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    • Abstract
  • The single back scattering model proposed by Aki is convenient due to its simplicity. This paper shows that the multiple scattering model whtch is an imporovement upon .Aki's model also gives a very simple and successful approach to estimate the heterogeneities under a certain area. Both the intensity and the decay of codas were used to find the Q-tactor related to scattering. It is noted that although both the single scattering model and the multiple scattering model give quite close results, the results from the latter are more reasonable and self-consistent. This paper also suggests that whichever simplified model is used, the logarithmic term in its equation is not negligible. As an example, seismograms of local erthoquakes recorded at the Beijing Regional Seismological Network were used and the mean free path of S-vvave under the Beijing area was obtained at frequencies around 1 Hz, shown in Table 2.
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    • References (1)
  • [1] Aki, K., Analysis of the seismic coda of local earthquakes as scattered waves, J. GeophyS. Res., 74, 615——631, 1969.

    [2] Aki, K., Scattering and attenuation of shear waves in the lithosphere, J. GrophyS. ReS., 85, 6496——6104,1980.

    [3] Gao, L. S,L, C. Lee, N. N. Biswas and K. Aki, Comparison of the effects between single and multiple——Scattering on coda waves for local earthquakes, Bull. Seism. Soc. Amen, 73, 377——389, 1983.

    [4] Kopnichev, Y. F.,. The role of multiple scattering in the formation of a seismogram's tail, lzvestiya, Academy of Science, USSR, Phyrics of the Solid Earth, 13, 394——398, 1977.

    [5] Sato, H., Mean free path of S waves under the Kanto district of Japan, J. Phyr. Earxh., 28, 185——198,1978.

    [6] Herrmann, R. B., Q estimates using the coda of local earthquakes, Bull. Scirm. Soc. timer, 70, 447——468,1980.

    [7] Gao, L. S., N. N. Biswas, L. C. Lee, K. Aki, Effects of multiple scattering on coda waves in threedimen——sional medium, Pure and Applied Ceophys., 121 3——15, 1983.

    [8] Sato, H., Energy propagation including scattering effects; single isotropic scattering approximation, J.Phys. Earth., 25, 27——41, 1977.

    [9] Dainty, A. M., A scattering model to eaplain seismic l2 observations in the lithosphere between 1 and 30Hz, Geophys. Res. Lett., 8, 1128——1178, 1981.

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

    [2] Aki, K., Scattering and attenuation of shear waves in the lithosphere, J. GrophyS. ReS., 85, 6496——6104,1980.

    [3] Gao, L. S,L, C. Lee, N. N. Biswas and K. Aki, Comparison of the effects between single and multiple——Scattering on coda waves for local earthquakes, Bull. Seism. Soc. Amen, 73, 377——389, 1983.

    [4] Kopnichev, Y. F.,. The role of multiple scattering in the formation of a seismogram's tail, lzvestiya, Academy of Science, USSR, Phyrics of the Solid Earth, 13, 394——398, 1977.

    [5] Sato, H., Mean free path of S waves under the Kanto district of Japan, J. Phyr. Earxh., 28, 185——198,1978.

    [6] Herrmann, R. B., Q estimates using the coda of local earthquakes, Bull. Scirm. Soc. timer, 70, 447——468,1980.

    [7] Gao, L. S., N. N. Biswas, L. C. Lee, K. Aki, Effects of multiple scattering on coda waves in threedimen——sional medium, Pure and Applied Ceophys., 121 3——15, 1983.

    [8] Sato, H., Energy propagation including scattering effects; single isotropic scattering approximation, J.Phys. Earth., 25, 27——41, 1977.

    [9] Dainty, A. M., A scattering model to eaplain seismic l2 observations in the lithosphere between 1 and 30Hz, Geophys. Res. Lett., 8, 1128——1178, 1981.
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