云南地区散射衰减、吸收衰减及尾波衰减的综合研究
|
摘要
利用云南省地震局遥测台网记录的地震波形资料,采用多流逝时间窗分析方法,得到了云南地区不同台站的散射衰减和吸收衰减,并通过单次散射模型得到了不同台站的尾波衰减.研究结果显示,云南地区的散射衰减、吸收衰减、总衰减和尾波衰减空间分布以金沙江—红河断裂带为界,均表现出西部低,东部高的特征.云南地区地震波衰减以吸收为主,2～4 Hz、4～8 Hz、8～16 Hz三个频带各台站的吸收衰减Q_i~(-1)均大于散射衰减Q_s~(-1),1～2 Hz除个别台站的吸收衰减明显小于散射衰减,其它台站均大于或接近散射衰减.尾波衰减Q_c~(-1)在1～2 Hz稍大于吸收衰减而小于总衰减,在2～4 Hz、4～8 Hz、8～16 Hz与总衰减接近,个别台站大于总衰减Q_t~(-1).云南地区散射衰减与频率的关系为Q_s~(-1)=0.0138f~(-1.61),吸收衰减与频率的关系为Q_i~(-1)=0.0119 f~(-1.86),总衰减与频率的关系为Q_t~(-1)=0.0247 f~(-1.1),尾波衰减与频率的关系为Q_c~(-1)=0.0129 f~(-0.71).与世界其它地区相比,云南地区的散射衰减处于中等偏低的水平,吸收衰减处于中等偏高的水平.
The scattering and the intrinsic attenuations below stations in the Yunnan area are obtained by using the earthquake waveform data recorded through the remote digital seismic network of the Earthquake Administration of Yunnan Province,and by adopting the multiple lapse time window analysis method.The code attenuation of different stations is obtained through the single scattering model.The study result shows that,as for the spatial distribution of scattering attenuation,intrinsic attenuation,total attenuation and code attenuation,the Jinshajiang-Honghe fault serves as the border between low attenuation in the western area and high attenuation in the eastern area.The earthquake wave attenuation in the Yunnan area is mainly intrinsic,since the intrinsic attenuation Q_i~(-1) of all stations is larger than the scattering attenuation Q_s~(-1) on three respective frequency bands of 2～4 Hz,4～8 Hz and 8～16 Hz, while on the frequency band of 1～2 Hz,the intrinsic attenuation of individual stations is obviously smaller than the scattering attenuation but the intrinsic attenuation of most stations is larger than or equal to the scattering attenuation Q_s~(-1).The code attenuationQ_c~(-1),on the frequency band of 1～2 Hz,is slightly larger than the intrinsic attenuation but smaller than the total attenuation,while the code attenuationQ_c~(-1),on the frequency band of 2～4 Hz,4～8 Hz and 8～16 Hz,is close to the total attenuation and,at individual stations,is larger than the total attenuation.The relationship between the scattering attenuation and the frequency in the Yunan area can be expressed as Q_s~(-1) = 0.0138f~(-1.61);for the intrinsic attenuation and the frequency,it isQ_i~(-1) = 0.0119 f~(-0.86);and for the total attenuation and the frequency,it is Q_t~(-1) = 0.0247 f~(-1.1);for the code attenuation and the frequency,it is Q_c~(-1)= 0.0129f~(-0.71). Compared with other areas worldwide,the scattering attenuation in the Yunan area is of a lower middle level and the intrinsic attenuation is of an upper middle level.
The scattering and the intrinsic attenuations below stations in the Yunnan area are obtained by using the earthquake waveform data recorded through the remote digital seismic network of the Earthquake Administration of Yunnan Province,and by adopting the multiple lapse time window analysis method.The code attenuation of different stations is obtained through the single scattering model.The study result shows that,as for the spatial distribution of scattering attenuation,intrinsic attenuation,total attenuation and code attenuation,the Jinshajiang-Honghe fault serves as the border between low attenuation in the western area and high attenuation in the eastern area.The earthquake wave attenuation in the Yunnan area is mainly intrinsic,since the intrinsic attenuation Q_i~(-1) of all stations is larger than the scattering attenuation Q_s~(-1) on three respective frequency bands of 2～4 Hz,4～8 Hz and 8～16 Hz, while on the frequency band of 1～2 Hz,the intrinsic attenuation of individual stations is obviously smaller than the scattering attenuation but the intrinsic attenuation of most stations is larger than or equal to the scattering attenuation Q_s~(-1).The code attenuationQ_c~(-1),on the frequency band of 1～2 Hz,is slightly larger than the intrinsic attenuation but smaller than the total attenuation,while the code attenuationQ_c~(-1),on the frequency band of 2～4 Hz,4～8 Hz and 8～16 Hz,is close to the total attenuation and,at individual stations,is larger than the total attenuation.The relationship between the scattering attenuation and the frequency in the Yunan area can be expressed as Q_s~(-1) = 0.0138f~(-1.61);for the intrinsic attenuation and the frequency,it isQ_i~(-1) = 0.0119 f~(-0.86);and for the total attenuation and the frequency,it is Q_t~(-1) = 0.0247 f~(-1.1);for the code attenuation and the frequency,it is Q_c~(-1)= 0.0129f~(-0.71). Compared with other areas worldwide,the scattering attenuation in the Yunan area is of a lower middle level and the intrinsic attenuation is of an upper middle level.
引文
[1] Aki K.Attenuation of shear-waves in the lithosphere for frequencies from 0． 05 to 25 Hz [J].Phys.Earth Planet.Inter.,1980,21:50～60．
[2] Taylor S,Bonnet B,Zandt G.Attenuation and scattering of broadband P and S wave across North America [J].J.Geophy.Res.,1986,91:7309～7325
[3] Frankel A,Wennerberg L.Energy-flux model of seismic coda:separation of scattering and intrinsic attenuation [J].Bull.eismol.Soc.Am.1987,77:1223～1251．
[4] Wu R S.Multiple scattering and energy transfer of seismic wave-Separation of scattering effect from intrinsic attenuation ～I.Theoretical model [J].Geophys.J.R.astr.Soc.,1985,82:57～80．
[5] Wu R S,Aki K.Multiple scattering and energy transfer of seismic wave-Separation of scattering effect from intrinsic attenuation II.Application of the theory to Hindu Kush region [J].Pure Appl.Geophys.,1988,128:49～80．
[6] Hoshiba M,Sato H,Fehler M.Numerical basis of the separation of scattering and intrinsic absorption from full seismogram envelope:A Monte Carlo simulation of multiple isotropic scattering [J].Pap.Meteorol.Geophys.,1991b,42:65～91．
[7] Fehler M,Hoshiba M,Sato H,et al.Separation of scattering and intrinsic attenuation for the Kanto-Tokai region,using measurements of S-wave energy versus hypocentral distance [J].Geophys.J.Int.,1992,108:787～800．
[8] Zeng Y.Su F,Aki K.Scattering wave energy propagation in a random isotropic scattering medium:1． Theory [J].J.Geophys.Res.,1991a,96:607～619．
[g] Hoshiba M.Separation of scattering attenuation and intrinsic absorption in Japan using the multiple lapse time window analysis of full seismogram envelope [J].J.Geophys.Res.,1993,98:15809～15,824．
[10] Jin A,Mayeda K,Adams D,Aki K.Separation of intrinsic and scattering attenuation in southern California using TERRAscopedata [J].J.geophys.Res.,1994,99:17835～ 17848．
[11] Tuve T,Bianco F,Patane D,etal.Attenuation study in the Straits of Messina area ( southern Italy ) [J].Tectonophysics,2006,421:173～185．
[12] 胡家富,丛连理,苏有锦等.云南及周边地区Lg尾波Q值的分布特征[J].地球物理学报,2003,46(6) :1157～1164． Hu J F,cong L L,Su Y J ,et al.Distribution characteristics of Lg coda Q in Yunnan and its adjacent regions [J].Chinese J.Geophys.(in Chinese) ,2003,46(6) :1157～1164．
[13] 马宏生,汪素云,裴顺平等.川滇及周边地区地壳横波衰减的成像研究[J].地球物理学报,2007,50(2) :465～471． Ma H s,Wang S Y,Pei S P,etal.Q_0 tomography of S wave attenuation in Siehuan-Yunnan and adjacent regions [J].Chinese J.Geophys(in Chinese),2O07,50(2) :465～471．
[14] 周连庆,赵翠萍,修济刚,等.川滇地区Lg波(牛参)值层析成像[J].地球物理学报,2008,51(6) :1745～1752． Zhou L Q,Zhao C P,Xiu J Z,et al.Tomography Q_(Lg) in Siehuan-Yunnan zone [J].Chinese J.Geophys(in Chinese),2008,51(6) :1745～1752．
[15] Aki K.Attenuation of shear-waves in the lithosphere for frequencies from 0． 05 to 25 Hz [J].Phys Earth Planet,1980,21:50～60．
[16] Zeng Y.Compact solutions for multiple scattered wave energy in time domain [J].Bull.seism.Soc.Am.,1991,81:1022～1029．
[17] Hoshiba M.Simulation of multiple-scattered coda wave excitation based on the energy conservation law [J].Phys.Earth Planet Inter.1991,67:123～136．
[18] Aki K,Chouet B.Origin of coda waves:Source,attenuation and scattering effects.J.geophys.Res.,1975,80:3322～ 3342．
[19] Fehler M,Hoshiba M,Sato H,et al.Separation of scattering and intrinsic attenuation for the Kanto-Tokai region,using measurements of S-wave energy versus hypocentral distance [J].Geophys.J.Int.,1992,108:787～800．
[20] Mayeda K,Koyanagi S,Hoshiba M,et al.A comparative study of scattering,intrinsic,and coda Q~(～1) for Hawaii,Long Valley and central California between 1． 5 and 15 Hz [J].J.Geophys.Res.1992,97:6643～6659．
[21] 汪辑安,徐青,张文仁.云南大地热流及地热地质问题[J]. 地震地质,1990,12(2) :367～377． Wang J A,Xu Q,Zhang W R.Heat flow data and some geologic-geothermal problems in Yunnan province [J].Seismology and Geology(in Chinese),1990,12 (2) :367 ～377．
[22] 苏有锦,刘杰,郑斯华,等.云南地区S波非弹性衰减Q值研究[J].地震学报,2006,28(2) :207～212． Su Y J,Liu J,Zheng S H,et al.Q value of anelastic S-wave attenuation in Yunnan [J].ACTA Seismologica Sinica (in Chinese),2006,28(2) :207～212．
[2s]苏有锦,刘祖荫,蔡民军,等.云南地区强震分布的深部地球介质背景[J].地震学报,1999,21(3) :31 3～322． Su Y J,Liu Z Y,Cai M J,etal.Deep medium environment of strong earthquakes occurrence in Yunnan region [J].ACTA Seismologica Sinica (in Chinese),1999,21(3) :313～ 322．
[24] Matsunami K.Laboratory tests of excitation and attenuation of coda wave using 2 D models of scattering media [J].Phys.Earth Planet Inter.,1991,67:104～114．
[25] Bianco F,Del Pezzo E,Malagnini L.Separation of depthdependent intrinsic and scattering seismic attenuation in the northeastern sector of the Italian Peninsula [J].Geophys.J.Int.,2005,161,doi:10． 1111/j.1365 246X.2005． 02555． x.
[26] Giampiccolo E,Tuve T,Gresta S.Swaves attenuation and separation of scattering and intrinsic absorption of seismic energy in southeastern Sicily (Italy)[J].Geophys.J.Int.2006,165:211～222．
[27] Tselentis G.Intrinsic and Scattering Seismic Attenuation in W.Greece[J].Pure Appl.Geophys.1998,153:703～712．
[28] Bianco F,Del Pezzo E,Castellano M.Separation of intrinsic and scattering seismic attenuation in the southern Apennine zone Italy[J].Geophys.J.Int.,2002,150:10～22．
[29] Ugalde A,Pujades L,Canas J,et al.Estimation of the intrinsic absorption and scattering attenuation in northeastern Venezuela (south eastern Caribbean) using coda waves [J].Pure Appl.Geophys,1998,153:685～702．
[30] Hoshiba M,Rietbrock A,Scherbaum F.Scattering attenuation and intrinsic absorption using uniform and depth dependent model-application to full seismogram envelope recorded in northern Chile [J].2001,J.Seismol.,5:157～179．
[31] Akinci A,Eyidogan H.Scattering and anelastic attenuation of seismic energy in the vicinity of north Anatolian fault zone,Eastern Turkey [J].Phys.Earth Planet.Inter.,2000, 122:229～239．
[2] Taylor S,Bonnet B,Zandt G.Attenuation and scattering of broadband P and S wave across North America [J].J.Geophy.Res.,1986,91:7309～7325
[3] Frankel A,Wennerberg L.Energy-flux model of seismic coda:separation of scattering and intrinsic attenuation [J].Bull.eismol.Soc.Am.1987,77:1223～1251．
[4] Wu R S.Multiple scattering and energy transfer of seismic wave-Separation of scattering effect from intrinsic attenuation ～I.Theoretical model [J].Geophys.J.R.astr.Soc.,1985,82:57～80．
[5] Wu R S,Aki K.Multiple scattering and energy transfer of seismic wave-Separation of scattering effect from intrinsic attenuation II.Application of the theory to Hindu Kush region [J].Pure Appl.Geophys.,1988,128:49～80．
[6] Hoshiba M,Sato H,Fehler M.Numerical basis of the separation of scattering and intrinsic absorption from full seismogram envelope:A Monte Carlo simulation of multiple isotropic scattering [J].Pap.Meteorol.Geophys.,1991b,42:65～91．
[7] Fehler M,Hoshiba M,Sato H,et al.Separation of scattering and intrinsic attenuation for the Kanto-Tokai region,using measurements of S-wave energy versus hypocentral distance [J].Geophys.J.Int.,1992,108:787～800．
[8] Zeng Y.Su F,Aki K.Scattering wave energy propagation in a random isotropic scattering medium:1． Theory [J].J.Geophys.Res.,1991a,96:607～619．
[g] Hoshiba M.Separation of scattering attenuation and intrinsic absorption in Japan using the multiple lapse time window analysis of full seismogram envelope [J].J.Geophys.Res.,1993,98:15809～15,824．
[10] Jin A,Mayeda K,Adams D,Aki K.Separation of intrinsic and scattering attenuation in southern California using TERRAscopedata [J].J.geophys.Res.,1994,99:17835～ 17848．
[11] Tuve T,Bianco F,Patane D,etal.Attenuation study in the Straits of Messina area ( southern Italy ) [J].Tectonophysics,2006,421:173～185．
[12] 胡家富,丛连理,苏有锦等.云南及周边地区Lg尾波Q值的分布特征[J].地球物理学报,2003,46(6) :1157～1164． Hu J F,cong L L,Su Y J ,et al.Distribution characteristics of Lg coda Q in Yunnan and its adjacent regions [J].Chinese J.Geophys.(in Chinese) ,2003,46(6) :1157～1164．
[13] 马宏生,汪素云,裴顺平等.川滇及周边地区地壳横波衰减的成像研究[J].地球物理学报,2007,50(2) :465～471． Ma H s,Wang S Y,Pei S P,etal.Q_0 tomography of S wave attenuation in Siehuan-Yunnan and adjacent regions [J].Chinese J.Geophys(in Chinese),2O07,50(2) :465～471．
[14] 周连庆,赵翠萍,修济刚,等.川滇地区Lg波(牛参)值层析成像[J].地球物理学报,2008,51(6) :1745～1752． Zhou L Q,Zhao C P,Xiu J Z,et al.Tomography Q_(Lg) in Siehuan-Yunnan zone [J].Chinese J.Geophys(in Chinese),2008,51(6) :1745～1752．
[15] Aki K.Attenuation of shear-waves in the lithosphere for frequencies from 0． 05 to 25 Hz [J].Phys Earth Planet,1980,21:50～60．
[16] Zeng Y.Compact solutions for multiple scattered wave energy in time domain [J].Bull.seism.Soc.Am.,1991,81:1022～1029．
[17] Hoshiba M.Simulation of multiple-scattered coda wave excitation based on the energy conservation law [J].Phys.Earth Planet Inter.1991,67:123～136．
[18] Aki K,Chouet B.Origin of coda waves:Source,attenuation and scattering effects.J.geophys.Res.,1975,80:3322～ 3342．
[19] Fehler M,Hoshiba M,Sato H,et al.Separation of scattering and intrinsic attenuation for the Kanto-Tokai region,using measurements of S-wave energy versus hypocentral distance [J].Geophys.J.Int.,1992,108:787～800．
[20] Mayeda K,Koyanagi S,Hoshiba M,et al.A comparative study of scattering,intrinsic,and coda Q~(～1) for Hawaii,Long Valley and central California between 1． 5 and 15 Hz [J].J.Geophys.Res.1992,97:6643～6659．
[21] 汪辑安,徐青,张文仁.云南大地热流及地热地质问题[J]. 地震地质,1990,12(2) :367～377． Wang J A,Xu Q,Zhang W R.Heat flow data and some geologic-geothermal problems in Yunnan province [J].Seismology and Geology(in Chinese),1990,12 (2) :367 ～377．
[22] 苏有锦,刘杰,郑斯华,等.云南地区S波非弹性衰减Q值研究[J].地震学报,2006,28(2) :207～212． Su Y J,Liu J,Zheng S H,et al.Q value of anelastic S-wave attenuation in Yunnan [J].ACTA Seismologica Sinica (in Chinese),2006,28(2) :207～212．
[2s]苏有锦,刘祖荫,蔡民军,等.云南地区强震分布的深部地球介质背景[J].地震学报,1999,21(3) :31 3～322． Su Y J,Liu Z Y,Cai M J,etal.Deep medium environment of strong earthquakes occurrence in Yunnan region [J].ACTA Seismologica Sinica (in Chinese),1999,21(3) :313～ 322．
[24] Matsunami K.Laboratory tests of excitation and attenuation of coda wave using 2 D models of scattering media [J].Phys.Earth Planet Inter.,1991,67:104～114．
[25] Bianco F,Del Pezzo E,Malagnini L.Separation of depthdependent intrinsic and scattering seismic attenuation in the northeastern sector of the Italian Peninsula [J].Geophys.J.Int.,2005,161,doi:10． 1111/j.1365 246X.2005． 02555． x.
[26] Giampiccolo E,Tuve T,Gresta S.Swaves attenuation and separation of scattering and intrinsic absorption of seismic energy in southeastern Sicily (Italy)[J].Geophys.J.Int.2006,165:211～222．
[27] Tselentis G.Intrinsic and Scattering Seismic Attenuation in W.Greece[J].Pure Appl.Geophys.1998,153:703～712．
[28] Bianco F,Del Pezzo E,Castellano M.Separation of intrinsic and scattering seismic attenuation in the southern Apennine zone Italy[J].Geophys.J.Int.,2002,150:10～22．
[29] Ugalde A,Pujades L,Canas J,et al.Estimation of the intrinsic absorption and scattering attenuation in northeastern Venezuela (south eastern Caribbean) using coda waves [J].Pure Appl.Geophys,1998,153:685～702．
[30] Hoshiba M,Rietbrock A,Scherbaum F.Scattering attenuation and intrinsic absorption using uniform and depth dependent model-application to full seismogram envelope recorded in northern Chile [J].2001,J.Seismol.,5:157～179．
[31] Akinci A,Eyidogan H.Scattering and anelastic attenuation of seismic energy in the vicinity of north Anatolian fault zone,Eastern Turkey [J].Phys.Earth Planet.Inter.,2000, 122:229～239．
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心