用经验格林函数确定中小地震的震源时间函数
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摘要: 采用正则化方法,并以小地震近似地代替通常由理论计算出的格林函数,结合近场加速度资料反演了1985年4月18日云南禄劝 Ms=6.1地震4个余震的震源时间函数.结果表明,较大余震除了震源持续时间较长外,其破裂过程也较为复杂,具有明显的阶段性.而较小余震的震源时间函数则近似为一脉冲函数.根据布龙震源模式,我们估计了这4个余震地震断层的破裂速度和断层面上的平均质点运动速度,结果表明,地震断层面的破裂速度小于地震波传播的横波速度;断层面上的平均质点运动速度为几至十几 cm/s,基本保持在同一水平.
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[1] 刘正荣、陈敬, 1986. 1985年4月18日云南省禄劝地震.地震学报,8,增刊,161——165.
[2] 王培德,1987.近震源强地面运动研究.博士研究生毕业论文,国家地震局地球物理研究所,北京.
[3] 吴明熙、王鸣、孙次昌、柯兆铭、王培德、陈运泰、吴大铭,1990. 1985年禄劝地震部分余震的精确定位.地震学报,12,121——129.
[4] 周家玉, 1987. 1985年石南禄劝地震部分余震的震源时间函数.硕士研究生毕业论文,国家地震局地球物理研究所,北京.
[5] Aki. K. and Richards, P. G.,1980. Quantitative eismoloy: Theon} and Methods, Vols. I and 2, W. H. Freeman,San Francisco.932 pp
[6] Brune, J. N.,1970. Tectonic stress and the spectra of seismic shear waves from earthquakes. J. Geophys. Res. , 75,4887——5009.
[7] Burridge. R. and Halliday, G. S.,1971. Dynamic shear cracks with friction as models for shallow focus earthquakes. Geophy. J. R. astr. Soc.,25, 261——283.
[8] Chen, Y. T.,Chen. X. F. and Knopoff, L——1987. Spontaneous growth and autonomous contraction of a two——dimensional earthquake fault .Tectonophysics,144, 5——17.
[9] Kikuchi, M. and Kanamori, H.,1982. Inversion of complex waves. Bull. Seism. Soc. Amer. , 72, 491——506.
[10] Mueller, C. S.,1985. Source pulse enhancement by deconvolution of an empirical Green's function. Geophvs. Res. Letters.12, 33——36.
[11] Madariaga. R.,1983. Earthquake source theory: A review, In: Kanamori,H. and Boshi,E. (eds),Earthquake: Observation, Theory and Intetprntation. Soc. Ital. di Fisica, Bologna. Italy,1——44
[12] Knopoff, L.,1981. The nature of the earthquake source, In: Husebye. E. S. and Mykkeltveit, S. ( eds. ), Identification of Seimic Sorce—— Earthquake or Underground Explosion. Reideh Dordrecht,49——69
[13] Niewiadomski, J.,and Meyer, K.,1986. Application of the regularization method for determination of seismic source times functions. Acta Geophysica Pol. , 34. 137——144.
[14] Stavrakakis, G. N.,Tselentis, A. G. and Drakopoules, J.,1987. Iterative deconvolution of teleseismic P waves from the Thessaloniki ( N. Greece ) earthquake of June 20. 1978. Pure Appl. Geophys.,124, 1039——1050.
[15] Tikhonov, A. N.,1963. On the solution of ill——posed problems and the method of regularization. Dokl. Akad. Nauk SSSR.,3. 501——504 (in Russian).
[16] Tikhonov, A. N.,Goncharsky, A. V.,Stepanov, V. V. and Yagola, A. G.,1983. Regularization Algorithms and Apriori Irformation. Nauka, Moscow (in Russian).
[17] Weaver, H. J.,1983. Applications of Discrete and Continuous Fourier Analysis. Wiley. New York, 90——109.[1] 刘正荣、陈敬, 1986. 1985年4月18日云南省禄劝地震.地震学报,8,增刊,161——165.
[2] 王培德,1987.近震源强地面运动研究.博士研究生毕业论文,国家地震局地球物理研究所,北京.
[3] 吴明熙、王鸣、孙次昌、柯兆铭、王培德、陈运泰、吴大铭,1990. 1985年禄劝地震部分余震的精确定位.地震学报,12,121——129.
[4] 周家玉, 1987. 1985年石南禄劝地震部分余震的震源时间函数.硕士研究生毕业论文,国家地震局地球物理研究所,北京.
[5] Aki. K. and Richards, P. G.,1980. Quantitative eismoloy: Theon} and Methods, Vols. I and 2, W. H. Freeman,San Francisco.932 pp
[6] Brune, J. N.,1970. Tectonic stress and the spectra of seismic shear waves from earthquakes. J. Geophys. Res. , 75,4887——5009.
[7] Burridge. R. and Halliday, G. S.,1971. Dynamic shear cracks with friction as models for shallow focus earthquakes. Geophy. J. R. astr. Soc.,25, 261——283.
[8] Chen, Y. T.,Chen. X. F. and Knopoff, L——1987. Spontaneous growth and autonomous contraction of a two——dimensional earthquake fault .Tectonophysics,144, 5——17.
[9] Kikuchi, M. and Kanamori, H.,1982. Inversion of complex waves. Bull. Seism. Soc. Amer. , 72, 491——506.
[10] Mueller, C. S.,1985. Source pulse enhancement by deconvolution of an empirical Green's function. Geophvs. Res. Letters.12, 33——36.
[11] Madariaga. R.,1983. Earthquake source theory: A review, In: Kanamori,H. and Boshi,E. (eds),Earthquake: Observation, Theory and Intetprntation. Soc. Ital. di Fisica, Bologna. Italy,1——44
[12] Knopoff, L.,1981. The nature of the earthquake source, In: Husebye. E. S. and Mykkeltveit, S. ( eds. ), Identification of Seimic Sorce—— Earthquake or Underground Explosion. Reideh Dordrecht,49——69
[13] Niewiadomski, J.,and Meyer, K.,1986. Application of the regularization method for determination of seismic source times functions. Acta Geophysica Pol. , 34. 137——144.
[14] Stavrakakis, G. N.,Tselentis, A. G. and Drakopoules, J.,1987. Iterative deconvolution of teleseismic P waves from the Thessaloniki ( N. Greece ) earthquake of June 20. 1978. Pure Appl. Geophys.,124, 1039——1050.
[15] Tikhonov, A. N.,1963. On the solution of ill——posed problems and the method of regularization. Dokl. Akad. Nauk SSSR.,3. 501——504 (in Russian).
[16] Tikhonov, A. N.,Goncharsky, A. V.,Stepanov, V. V. and Yagola, A. G.,1983. Regularization Algorithms and Apriori Irformation. Nauka, Moscow (in Russian).
[17] Weaver, H. J.,1983. Applications of Discrete and Continuous Fourier Analysis. Wiley. New York, 90——109. -
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