各向异性ATI介质剪切位错点源P波远场辐射
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摘要
假设震源区为ATI介质,传播介质为全空间各向同性介质情况下,给出了剪切位错源P波远场辐射解析表达式,讨论了震源区各向异性对远场P波振幅和震源球的影响。结果表明,震源区裂隙密度,裂隙方位等参数的动态变化导致P波远场辐射花样也随之动态变化,同时也会造成非双力偶百分含量的动态变化。研究认为,在井中对中小地震的非双力偶机制进行动态监测,也许是一个监测未来大地震的可能方法。
Suppose that source region is ATI medium and propagation path is isotropic media,analytical representations of far-field P-wave displacement and radiation are given and we discuss the effects of source anisotropy on far-field P-wave displacement and focal sphere.Some results show that crack density,azimuth et al.parameters play an important role in P-wave radiation and lead to non-double-earthquake mechanism.We propose that It maybe a good method which we can directly detect percentage of DC,CLVD and ISO for micro-earthquake before large earthquake in the well.
Suppose that source region is ATI medium and propagation path is isotropic media,analytical representations of far-field P-wave displacement and radiation are given and we discuss the effects of source anisotropy on far-field P-wave displacement and focal sphere.Some results show that crack density,azimuth et al.parameters play an important role in P-wave radiation and lead to non-double-earthquake mechanism.We propose that It maybe a good method which we can directly detect percentage of DC,CLVD and ISO for micro-earthquake before large earthquake in the well.
引文
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[18]Wu J,Gao Y,Chen YT.Shear-wave splitting in the crust beneath the southeast Capital area of North China[J].J Seism,2009,13(2):277-286.
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[21]Yun C,JoséB,Zhang ZJ.Radial anisotropy in the crust and upper mantle beneath the Qinghai-Tibet Plateau and surrounding regions[J].Journal of Asian Earth Sciences,2009,36(4-5):289-302.
[22]Liu K,Zhang Z,Hu J,et al.Frequency band-dependence of S-wave splitting in China mainland and its implications[J].Science in China Series D-Earth Sciences,2001,44(7):659-665.
[23]Zhang ZJ,Li YK,Lu DY,et al.Velocity and anisotropy structure of the crust in the Dabieshan orogenic belt from wide-angle seismic data[J].Physics of the Earth and Planetary Interiors,2000,122(1-2):115-131.
[24]Zhang ZJ,Teng JW,Badal J,et al.Construction of regional and local seismic anisotropic structures from wide-angle seismic data:Crustal deformation in the southeast of China[J].Journal of Seismology,2009,13(2):241-252.
[25]Crampin S.Effective anisotropic elastic-constants for wave propagation through cracked solids[J].Geophys J R Astron Soc,1984,76:135-145.
[26]Crampin S,Taylor DB.The propagation of surface waves in anisotropic media[J].Geophys J R Astron Soc,1971,25:71-87.
[27]Crampin S.A review of the effects of anisotropic layering on the propagation of seismic waves[J].Geophys J R Astron Soc,1977,49:9-27.
[28]Yao C,Xiong Y.Far-fields radiation pattern from an anisotropic dislocation point source[J].Can J Expl Geophys,1993,29:315-323.
[29]姚陈,蔡明刚.TI任意空间取向弹性常数解析表述[J].地球物理学报,2009,52(9):2345-2348.Yao C,Cai MG.Analytical expression of TI elastic tensor with arbitrary orientation[J].Chinese Journal of Geophysics,2009,52(9):2345-2348.
[30]郝重涛,姚陈.任意空间取向TI介质中体波速度特征[J].地球物理学报,2007,50(9):546-555.Hao CT,Yao C,Analysis of body-wave velocity characteristic for TI medium with arbitrary spatial orientation[J].Chinese Journal of Geophysics,2007,50(2):546-555.
[31]Aki K,Richards PG.Quantitative Seismology:Theory and methods[M].San Francisco:Freeman,1980.
[32]Aki K,Richards PG.Quantitative Seismology[M].Sansalito:University Science Books,2002.
[33]Hudson JA.Wave speeds and attenuation of elastic waves in material containing cracks[J].Geophys J R Astron Soc,1981,64:133-150.
[2]Fitch TJ,McCowan DW,Shield MW.Estimation of the seismic moment tensor from teleseismic body wave data with applications to intraplate and mantle earthquakes[J].J Geophys Re,1980,85:3817-3828.
[3]Dziewonski AM,Chou TA,Woodhouse JH.Determination of earthquake source parameters from waveform data for studies of global and region seismicity[J].J Geophys Re,1981,86:2825-2852.
[4]Dziewonski AM,Woodhouse JH.An experiment in the systematic study of global seismicity:Centroid-moment tensor solution for201moderate and large earthquakes in1981[J].J Geophys Res,1983,88:3247-3271.
[5]Dreger DS,Helmberger DV.Determination of source parameters at regional distances with three-component sparse network data[J].J Geophys Res,1993,98:8107-8125.
[6]Sipkin AS.Estimation of earthquake source parameters by the inversion of waveform data:Synthetic waveforms[J].Physics of the Earth and Planet Interiors,1982,30(2-3):242-259.
[7]Sipkin AS.Rapid determination of global moment tensor solution[J].Geophysical Research Letters,1994,21(16):1667.
[8]Chen YT,Xu LS,Li X,et al.Source process of the1990Gonghe,China,earthquake and tectonic stress field in the northeastern Qinhai-Xizang(tibetan)plateau[J].Pure and Applied Geophysics,1996,146(3):697-715.
[9]Kawakatsu H.Insignificant isotropic component in the moment tensor of deep earthquakes[J].Nature,1991,351(6321):50.
[10]蔡晓刚,姚陈,陈晓非.各向异性ATI介质剪切位错源地震矩张量[J].地球物理学报,2011,54(7):1772-1782.Cai XG,Yao C,Chen XF.Seismic moment tensor in ATI medium,shear faulting[J].Chinese Journal of Geophysics,2011,54(7):1772-1782.
[11]蔡晓刚.各向异性ATI介质地震矩张量理论研究[D].北京:北京大学地球物理系,2009.Cai XG.The theoretical studies on seismic moment tensor in anisotropic media[D].Beijing:Department of Geophysics,Peking university,2009.
[12]Crampin S.Review of wave motion in anisotropic and cracked elastic-media[J].Wave Motion,1981,3(4)343-391.
[13]Booth DC,Crampin S.The anisotropic reflectivity technique:Theory[J].Geophys J R Astron Soc,1983,72:755-766.
[14]Crampin S.Effects of point singularities on shear-wave propagation in sedimentary basins[J].Geophys J R Astron Soc,1991,107:531-543.
[15]Crampin S,Peacock S.A review of the current understanding of seismic shear-wave splitting in the earth’s crust and common fallacies interpretation[J].Wave Motion,2008,45(6):675-722.
[16]Crampin S.The dispersion of surface wave in multilayered anisotropic media[J].GeophysJ R Astron Soc,1970,21:387-402.
[17]Gao Y,Wu J.Compressive stress field in the crust deduced from shear-wave anisotropy:An example in capital area of China[J].Chinese Sci Bull,2008,53(18):2840-2848.
[18]Wu J,Gao Y,Chen YT.Shear-wave splitting in the crust beneath the southeast Capital area of North China[J].J Seism,2009,13(2):277-286.
[19]Gao Y,Wu J,Cai JA,et al.Shear-wave splitting in southeast of Cathaysia block,South China[J].Journal of Seismology,2009,13(2):267-275.
[20]Gao Y,Wu J,Yi GX,et al.Crust-mantle coupling in North China:Preliminary analysis from seismic anisotropy[J].Chinese Sci Bull,2010,55,doi:10.1007/s11434-010-4135-y.
[21]Yun C,JoséB,Zhang ZJ.Radial anisotropy in the crust and upper mantle beneath the Qinghai-Tibet Plateau and surrounding regions[J].Journal of Asian Earth Sciences,2009,36(4-5):289-302.
[22]Liu K,Zhang Z,Hu J,et al.Frequency band-dependence of S-wave splitting in China mainland and its implications[J].Science in China Series D-Earth Sciences,2001,44(7):659-665.
[23]Zhang ZJ,Li YK,Lu DY,et al.Velocity and anisotropy structure of the crust in the Dabieshan orogenic belt from wide-angle seismic data[J].Physics of the Earth and Planetary Interiors,2000,122(1-2):115-131.
[24]Zhang ZJ,Teng JW,Badal J,et al.Construction of regional and local seismic anisotropic structures from wide-angle seismic data:Crustal deformation in the southeast of China[J].Journal of Seismology,2009,13(2):241-252.
[25]Crampin S.Effective anisotropic elastic-constants for wave propagation through cracked solids[J].Geophys J R Astron Soc,1984,76:135-145.
[26]Crampin S,Taylor DB.The propagation of surface waves in anisotropic media[J].Geophys J R Astron Soc,1971,25:71-87.
[27]Crampin S.A review of the effects of anisotropic layering on the propagation of seismic waves[J].Geophys J R Astron Soc,1977,49:9-27.
[28]Yao C,Xiong Y.Far-fields radiation pattern from an anisotropic dislocation point source[J].Can J Expl Geophys,1993,29:315-323.
[29]姚陈,蔡明刚.TI任意空间取向弹性常数解析表述[J].地球物理学报,2009,52(9):2345-2348.Yao C,Cai MG.Analytical expression of TI elastic tensor with arbitrary orientation[J].Chinese Journal of Geophysics,2009,52(9):2345-2348.
[30]郝重涛,姚陈.任意空间取向TI介质中体波速度特征[J].地球物理学报,2007,50(9):546-555.Hao CT,Yao C,Analysis of body-wave velocity characteristic for TI medium with arbitrary spatial orientation[J].Chinese Journal of Geophysics,2007,50(2):546-555.
[31]Aki K,Richards PG.Quantitative Seismology:Theory and methods[M].San Francisco:Freeman,1980.
[32]Aki K,Richards PG.Quantitative Seismology[M].Sansalito:University Science Books,2002.
[33]Hudson JA.Wave speeds and attenuation of elastic waves in material containing cracks[J].Geophys J R Astron Soc,1981,64:133-150.
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