近震源宽频带记录的地震矩张量反演
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摘要: 以1985年4月18日云南禄劝地震(Ms=6.1)的15次余震为例, 使用简单介质模型进行近震源记录的地震矩张量反演, 并试图通过反演结果的讨论, 进一步明确有关方法的意义和限度。将DCS-302数字磁带加速度仪组成的小孔径流动台网获得的三分向近震源宽频带记录进行两次积分得到位移地震图, 对依据震相特征选出的信噪比较大的直达P波、直达S波和SP转换波波形在频率域进行矩张量反演。反演中采用均匀弹性半空间的格林函数。计算结果表明, 采用简单的介质模型, 选取信噪比较大的震相进行矩张量反演, 对MLL约为4-5的地震可以较好地给出震源机制解。在不十分了解详细结构的情况下, 用本文所发展的反演方法处理大量中小地震求震源机制和构造应力场是十分便利的。地震矩张量反演的结果给出禄劝地区的主压应力轴为近NNW向, 接近水平, 表明该地震与欧亚板块和印度板块边界的构造运动有关。
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[1] 李肇仁、陈运泰.1985年云南禄劝地震部分余震的分布及最大余震的双次破裂过程.地震学报, 待发表.
[2] 刘正荣、陈敬, 1986. 1985年9月18日云南禄劝地震.地震学报, 8, 增刊, 161——165.
[3] 倪江川、陈运泰、王鸣、吴明熙、周家玉、王培德、吴大铭, 1991.云南禄劝地震部分余震的矩张量反演.地震学报, 13, 912——919.
[4] 时振梁、张少泉、赵荣国、吴开统、陆其鸽、张敏政、卓饪如, 1990.地震工作手册, 132——135.地震出版社, 北京.
[5] 吴明熙、王鸣、孙次昌、柯兆明、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.
[6] Aki, K., 1969. Analysis of seismic coda of local earthquakes as scattered waves. J. Geophys. Res., 74. 615——631.
[7] Aki, K. and Patton, H., 1978. Determination of seismic moment tensor using surface waves. Tectoyrmphysvcs, 49, 213——222.
[8] Bakun, W. H. and Lindh, A. G., 1977. Local magnitudes, seismic moments, and coda durations for earthquakes near Orovllle, Califormia. Bull. Seism. Soc. Arner., 87. 615——629.
[9] Bath, M., 1981. Earthquake magnitude; recent research and current trends. Earth——Sca. Rev., 17, 315——398.
[10] Barker, J. S. and Longston, C. A., 1982. Moment tensor inversion of complex earthquakes. Geoyhys. J. R. aslr. Soc., 88, 777——803.
[11] Chen, Y. T., Zhou, J. Y. and Ni, J. C., 1991. Inversion of near——source broadband accelerograms for the earthquake source——time——function. Tectonophysics, 187, 89——98.
[12] Doornbos, D. J., 1982. Seismic moment tensors and kinematic source parameters. C'}eoyhys. J. R. astr. Soc., 89, 235——251.
[13] Fitch, T. J., McCowan, D. W. and Shields, M. W., 1980. Estimation of the seismic moment tensor from teleseismic body wave data with application to intraplate and mantle earthquakes. J. Geophys. Rzs., 85, 3817——3828.
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[17] Johnson, L. R. and McEvilly, T. V., 1979. Near——field observations and source parameters of central California earthquakes. Bull. Seism. Soc. Amer, 64, 1855——1866.
[18] Johnson, L. R., 1974. Greenzs function for Lambs problem. Geophys. J. R. astr. Soc., 37, 99——131.
[19] Kanamori. H. and Given, J. W. 1981. Use of long——period surface waves for rapid determination of earthquake——source parameters. Phys. Earth Planet. Inter., 27, 8——31.
[20] Koch, K., 1991. Moment tensor inversion of local earthquake data; I. Investigation of the method and its numerical stability with model calculations. Geophys. J. lnt.. 100. 305——319.
[21] Lay, T., Given, J. W. and Kanamori, H. 1982. Long——period mechanism of the 8 November 1980 Eureka, California, earthquake. Bull. Seism.. Soc. Amer., 72, 439——456.
[22] Longston, C. A., 1981. Source inversion of seismic waveform; the Koyna, India, earthquake of 13 September 1967. Bull. Seism. Soc. Amer., 71, 1——24.
[23] McCowan, D. W., 1976. Moment tensor representation of surface wave sources. Geoyhys. J. R. astr. Soc., 44. 595——599.
[24] Mendiguren, J.A., 1977. lnversion of surface wave data in source mechanism studies. J. Geoyhys. Res., 82, 889——899.
[25] Romanowicz. B. 1982. Moment tensor inversion of long period Rayleigh waves: a new approach. J. Geoyhys. Res., 87, 5395——5407.
[26] Sileny, J., Panza, G. F. and Campus. P., 1992. Waveform inversion for point source moment tensor retrieval with variable epicentral depth and structural model. Gevyhys. J. Int., 109. 259——274.
[27] Spottiswoode, S. M. and McGarr, A., 1975. Source parameters of tremors in a deep——level gold mine. Bull. Seism. Soc. Amen., 65, 93——112.
[28] Stump, B. W. and Johnson, L. R. 1977. The determination of source properties by the linear inversion of seismograms. Bull. Seism. Soc. Amen., 67, 1989——1502.
[29] Stump, B. W. and Johnson, L. R., 1989. Near——field source characterization of contained nuclear explosion in tuff. Bull. Seasm. Soc. Amer., 74. 1——26.
[30] Vered, M., 1978. The probable maximum earthquake magnitued associated with the Jordan rift. Israel J. Earth——Sci., 27, 82——84.
[31] Wyss, M. and Brune, J. N. 1968. Seismic moment, stress, and source dimensions for earthquakes in the California——Nevada region. J. Geophys. Res. 73. 4681——9694.[1] 李肇仁、陈运泰.1985年云南禄劝地震部分余震的分布及最大余震的双次破裂过程.地震学报, 待发表.
[2] 刘正荣、陈敬, 1986. 1985年9月18日云南禄劝地震.地震学报, 8, 增刊, 161——165.
[3] 倪江川、陈运泰、王鸣、吴明熙、周家玉、王培德、吴大铭, 1991.云南禄劝地震部分余震的矩张量反演.地震学报, 13, 912——919.
[4] 时振梁、张少泉、赵荣国、吴开统、陆其鸽、张敏政、卓饪如, 1990.地震工作手册, 132——135.地震出版社, 北京.
[5] 吴明熙、王鸣、孙次昌、柯兆明、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.
[6] Aki, K., 1969. Analysis of seismic coda of local earthquakes as scattered waves. J. Geophys. Res., 74. 615——631.
[7] Aki, K. and Patton, H., 1978. Determination of seismic moment tensor using surface waves. Tectoyrmphysvcs, 49, 213——222.
[8] Bakun, W. H. and Lindh, A. G., 1977. Local magnitudes, seismic moments, and coda durations for earthquakes near Orovllle, Califormia. Bull. Seism. Soc. Arner., 87. 615——629.
[9] Bath, M., 1981. Earthquake magnitude; recent research and current trends. Earth——Sca. Rev., 17, 315——398.
[10] Barker, J. S. and Longston, C. A., 1982. Moment tensor inversion of complex earthquakes. Geoyhys. J. R. aslr. Soc., 88, 777——803.
[11] Chen, Y. T., Zhou, J. Y. and Ni, J. C., 1991. Inversion of near——source broadband accelerograms for the earthquake source——time——function. Tectonophysics, 187, 89——98.
[12] Doornbos, D. J., 1982. Seismic moment tensors and kinematic source parameters. C'}eoyhys. J. R. astr. Soc., 89, 235——251.
[13] Fitch, T. J., McCowan, D. W. and Shields, M. W., 1980. Estimation of the seismic moment tensor from teleseismic body wave data with application to intraplate and mantle earthquakes. J. Geophys. Rzs., 85, 3817——3828.
[14] Gilbert, F., 1970. Exitation of the normal modes of the Earth by earthquake sources. Geophys. J. R. astr. Soc, 22, 223——226.
[15] Gilbert, F. and Dziewonski, A. M., 1975. An application of normal mode theory to the retrieval of structural parameters and source mechanisms from seismic spectra. Phzl. Trans. R. Soc., A278, 187——269.
[16] Gibowicz. S. J., 1975. Variation of source properites; the Inangahua, New Zealand, aftershocks of 1968. Bull. Sezsm. Soc. Amer., 65, 261——276.
[17] Johnson, L. R. and McEvilly, T. V., 1979. Near——field observations and source parameters of central California earthquakes. Bull. Seism. Soc. Amer, 64, 1855——1866.
[18] Johnson, L. R., 1974. Greenzs function for Lambs problem. Geophys. J. R. astr. Soc., 37, 99——131.
[19] Kanamori. H. and Given, J. W. 1981. Use of long——period surface waves for rapid determination of earthquake——source parameters. Phys. Earth Planet. Inter., 27, 8——31.
[20] Koch, K., 1991. Moment tensor inversion of local earthquake data; I. Investigation of the method and its numerical stability with model calculations. Geophys. J. lnt.. 100. 305——319.
[21] Lay, T., Given, J. W. and Kanamori, H. 1982. Long——period mechanism of the 8 November 1980 Eureka, California, earthquake. Bull. Seism.. Soc. Amer., 72, 439——456.
[22] Longston, C. A., 1981. Source inversion of seismic waveform; the Koyna, India, earthquake of 13 September 1967. Bull. Seism. Soc. Amer., 71, 1——24.
[23] McCowan, D. W., 1976. Moment tensor representation of surface wave sources. Geoyhys. J. R. astr. Soc., 44. 595——599.
[24] Mendiguren, J.A., 1977. lnversion of surface wave data in source mechanism studies. J. Geoyhys. Res., 82, 889——899.
[25] Romanowicz. B. 1982. Moment tensor inversion of long period Rayleigh waves: a new approach. J. Geoyhys. Res., 87, 5395——5407.
[26] Sileny, J., Panza, G. F. and Campus. P., 1992. Waveform inversion for point source moment tensor retrieval with variable epicentral depth and structural model. Gevyhys. J. Int., 109. 259——274.
[27] Spottiswoode, S. M. and McGarr, A., 1975. Source parameters of tremors in a deep——level gold mine. Bull. Seism. Soc. Amen., 65, 93——112.
[28] Stump, B. W. and Johnson, L. R. 1977. The determination of source properties by the linear inversion of seismograms. Bull. Seism. Soc. Amen., 67, 1989——1502.
[29] Stump, B. W. and Johnson, L. R., 1989. Near——field source characterization of contained nuclear explosion in tuff. Bull. Seasm. Soc. Amer., 74. 1——26.
[30] Vered, M., 1978. The probable maximum earthquake magnitued associated with the Jordan rift. Israel J. Earth——Sci., 27, 82——84.
[31] Wyss, M. and Brune, J. N. 1968. Seismic moment, stress, and source dimensions for earthquakes in the California——Nevada region. J. Geophys. Res. 73. 4681——9694.
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