利用尾波测定四川部分地区的介质品质因子
DETERMINATION OF Q-VALUE BY THE CODA WAVE FOR A PORTION OF THE SICHUAN PROVINCE
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摘要: 按照安艺敬一(Aki)提出的地震尾波理论,利用同一地震的多台记录,以同一地震有一确定的地震矩为基础建立方程,并以文献[8]所得出的品质因子数为基准,测定了四川部份地区地壳浅部的介质品质因子.结果表明,地震尾波的衰减存在着明显的方位依赖.根据1971年至1975年间几次地震所给出 Q 值来看,四川部份地区大致可以分为三个不同的 Q 值区,值得注意的是:低 Q 区内曾发生过7.1级强震.Abstract: By using the theory of coda waves developed by K. Aki for an earthquake recorded at a number of stations and the equations based on the assumption that each earthquake has a definite seismic moment, the Q-value of the crustal medium at shallow depth of a portion of the province of Sichuan has been determined, taking the results published by Chen Yuntai et al.[8] as a basis.The results thus obtained reveal a definite character of variation with direction of the attenuation of coda waves. Besides, earthquakes occurred from 1971 to 1975 give three sub-regions of the province, each of different Q-value. It is also noted that in the region, of low Q-value occurred an earthquake of magnitude 7.1.
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[1] K. Aki, Analysis of the seismic coda of local earthquake as scattered waves, J. G. R., 615——631, 1969.
[2] K. Aki and B. Chouet, Origin of coda waves: Source, attenuation, and scattering effects, J. G. R, 80, 3332——3342, 1975.
[3] M. Tsujiura, Spectral analysis of the cads waves from local earthquakes, Bulletin. of Ear——thquake Research Institute, 53, 1——48, 1978.
[4] T. G. Rautian and V. I. Khalturin, The use of the coda for determinatiou of the earthquake source spectrum, B. S. S. A., 68, 923——943, 1978.
[5] B. Chouet, g. Aki and M. Tsujiura, Regional variation of the svaliug law of earthquake eource spectra, B. S. S. d., 68, 49——79, 1978.
[6] A.M.Suteau acrd J.H.Whitcomb, A local earthquake coda maginitude and its relation to duration, moment Mo and local Richter magnitude ML B. S. S. A., 69, 353——368,1979.
[7] R. B. Herrmann, Q estimates using the coda of local earthquakes, B. S. S. d., 70, 447——468,1980.
[8] 陈运泰等,巧家、石棉的小震震源参数的测定及其地震危险性的估计,地球物1}学报,19, 3, 1976,
[9] 冯康,数值计算方法,国防工业出版社,1978.
[10] M.巴特,地球物理学中的谱分析,郑治真译,地震出版社,1978.
[11] 徐果明、周蕙兰,地震学原理,科学出版社,1982.
[12] C. B. Arehambeau et al., Fine structure of the upper mantle, J. G. R., 74, 25, 5825——5863, 1969.[1] K. Aki, Analysis of the seismic coda of local earthquake as scattered waves, J. G. R., 615——631, 1969.
[2] K. Aki and B. Chouet, Origin of coda waves: Source, attenuation, and scattering effects, J. G. R, 80, 3332——3342, 1975.
[3] M. Tsujiura, Spectral analysis of the cads waves from local earthquakes, Bulletin. of Ear——thquake Research Institute, 53, 1——48, 1978.
[4] T. G. Rautian and V. I. Khalturin, The use of the coda for determinatiou of the earthquake source spectrum, B. S. S. A., 68, 923——943, 1978.
[5] B. Chouet, g. Aki and M. Tsujiura, Regional variation of the svaliug law of earthquake eource spectra, B. S. S. d., 68, 49——79, 1978.
[6] A.M.Suteau acrd J.H.Whitcomb, A local earthquake coda maginitude and its relation to duration, moment Mo and local Richter magnitude ML B. S. S. A., 69, 353——368,1979.
[7] R. B. Herrmann, Q estimates using the coda of local earthquakes, B. S. S. d., 70, 447——468,1980.
[8] 陈运泰等,巧家、石棉的小震震源参数的测定及其地震危险性的估计,地球物1}学报,19, 3, 1976,
[9] 冯康,数值计算方法,国防工业出版社,1978.
[10] M.巴特,地球物理学中的谱分析,郑治真译,地震出版社,1978.
[11] 徐果明、周蕙兰,地震学原理,科学出版社,1982.
[12] C. B. Arehambeau et al., Fine structure of the upper mantle, J. G. R., 74, 25, 5825——5863, 1969.
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