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1985: SIMULTANEOUS DETERMINATION OF SOURCE PARAMETERS AND SOURCE MECHANISM OF SMALL EARTHQUAKES. Acta Seismologica Sinica, 7(3): 237-253.
Citation: 1985: SIMULTANEOUS DETERMINATION OF SOURCE PARAMETERS AND SOURCE MECHANISM OF SMALL EARTHQUAKES. Acta Seismologica Sinica, 7(3): 237-253.
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SIMULTANEOUS DETERMINATION OF SOURCE PARAMETERS AND SOURCE MECHANISM OF SMALL EARTHQUAKES

  • Seismological Bureau of Guangdong Province

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  • Published Date: August 31, 2011
    Graphical Abstract
    • Abstract
  • Using a model of circular shear dislocation with the propagation medium non-uniform crack and considering the unit-impulse response of the propagation medium-seismograph system,the amplitudes and half period of the first arrival of P waves radiated in various directions are calculated in this paper. We have as well given a few sets of theoretical curves by which source parameters are determined. Bused on the Q value obtained from the first quarter period of the initial P arrival and the fault-plane solu tion fitted by the focal sphere,a method of simultaneous determination of source parameters and mechanism solutions of small earthquakes is presented. In this method,the source parameters as well as the focal mechanism for individual small earthquakes are obtained by including focal mechanism as part of the parameters to be determined,and by taking its effect on the other parameters into account. Analysis and tests on the data of small earthquakes collected from four seismic stations in the Xinfengjiang reservoir region show that the mean quality factor of the medium is about 450,the seismic moment being 1019-1020 dyn cm and the mean stress drop being 35 bar or so; besides,the faulf-plane solutions represent the principal characteristics of tectonic stress field in this region.
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    • References (1)
  • [1] O'Neill, M. E., and Healy, J. H. Determination of source parameters of small earthquakes from Pwave rise time, Bull. Seism. Soc. Anzcr., 63, 599——614, 1973.

    [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,石棉、巧家的小震震源参数的测定及其地震危险性的估计,地球物理学报,19, 206——231, 1976,

    [3] 林邦慧、李志勇、魏富胜,京津地区9值及其平均应力降的分布特征,地球物理学报,25, 349——351, 1982,

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

    [5] Haskell, N. A. Total energy and energy spectral density of elastic wave radiation from propagation fault, Bssll. Scasm. Soc. Amcr., 54, 1811——1841, 1964.

    [6] 陈运泰、王妙月、林邦慧、刘万琴,中、小地震体波的频谱和纵、横波拐角频率比,科学通报,21, 919 418 1976,

    [7] Aki, K. and P. G., Richards, Quantitative Seismology, 809, W. H. Freeman and Company, San Franciso, 1980.

    [8] 陈培善、卓钮如、金严、王志刚、黄伟、李文秀、胡荣胜,唐山地震前后京津唐张地区的应力场,地球物理学报,21, 39——57, 1978,

    [9] 周克森,DSL——1型流动地震仪的动态特性研究,西北地震学报,6, 80——88, 1984,

    [10] 王妙月、杨愁源、胡毓良、李自强、陈运泰、金严、冯锐,新丰江水库地震的震源机制及其成因初步探讨,中国科学,1, 85——97, 1976,

    [11] 陈益明,新丰江水库地震及其小震震源机制的研究,华南地震,2, 1——8, 1982,

    [1] O'Neill, M. E., and Healy, J. H. Determination of source parameters of small earthquakes from Pwave rise time, Bull. Seism. Soc. Anzcr., 63, 599——614, 1973.

    [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,石棉、巧家的小震震源参数的测定及其地震危险性的估计,地球物理学报,19, 206——231, 1976,

    [3] 林邦慧、李志勇、魏富胜,京津地区9值及其平均应力降的分布特征,地球物理学报,25, 349——351, 1982,

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

    [5] Haskell, N. A. Total energy and energy spectral density of elastic wave radiation from propagation fault, Bssll. Scasm. Soc. Amcr., 54, 1811——1841, 1964.

    [6] 陈运泰、王妙月、林邦慧、刘万琴,中、小地震体波的频谱和纵、横波拐角频率比,科学通报,21, 919 418 1976,

    [7] Aki, K. and P. G., Richards, Quantitative Seismology, 809, W. H. Freeman and Company, San Franciso, 1980.

    [8] 陈培善、卓钮如、金严、王志刚、黄伟、李文秀、胡荣胜,唐山地震前后京津唐张地区的应力场,地球物理学报,21, 39——57, 1978,

    [9] 周克森,DSL——1型流动地震仪的动态特性研究,西北地震学报,6, 80——88, 1984,

    [10] 王妙月、杨愁源、胡毓良、李自强、陈运泰、金严、冯锐,新丰江水库地震的震源机制及其成因初步探讨,中国科学,1, 85——97, 1976,

    [11] 陈益明,新丰江水库地震及其小震震源机制的研究,华南地震,2, 1——8, 1982,
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