重力技术在地球自由振荡检测研究中的应用
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摘要
地球自由振荡是一种十分重要的地球动力学现象,用重力技术检测地球自由振荡,结合地震技术可为获得地球内部精细结构提供一种重要手段.本文概要综述了地球自由振荡理论研究的发展和重力技术检测现状,详细讨论了利用我国武汉超导重力仪检测到的地球自由振荡本征周期和谱峰分裂现象,结合我国实际情况提出了研究展望,旨在给出需解决的学科问题和相应的策略探讨.
Earth′s Free oscillations are the very important geodynamical phenomena,the detection of the Earth′s Free oscillations using gravity technique,and combination of the seismological technique,it provide us with an important measure for obtaining the detail Earth's interior structures.The present status on the progress of the theoretical study and detection using gravity technique of the Earth′s Free oscillations are summarized briefly in this paper.The eigen-periods of the Earth′s Free oscillations and the frequency spectral splitting phenomena detected using Wuhan superconducting gravimeter in China are discussed in details.Combining with the our real condition in China,the research prospects are given in order to point out the scientific subjects to be solved necessary and the corresponding politic approach.
Earth′s Free oscillations are the very important geodynamical phenomena,the detection of the Earth′s Free oscillations using gravity technique,and combination of the seismological technique,it provide us with an important measure for obtaining the detail Earth's interior structures.The present status on the progress of the theoretical study and detection using gravity technique of the Earth′s Free oscillations are summarized briefly in this paper.The eigen-periods of the Earth′s Free oscillations and the frequency spectral splitting phenomena detected using Wuhan superconducting gravimeter in China are discussed in details.Combining with the our real condition in China,the research prospects are given in order to point out the scientific subjects to be solved necessary and the corresponding politic approach.
引文
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[10]Jefferys H,Jefferys B S.Methods of Mathmetical Physics[J].Cambridge University Press,1956.
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[15]Woodhouse J H,Giardini D,Li X D.Evidence for inner coreanisotropy from free oscillations[J].Geophys Res Letter,1986,13:1549~1552.
[16]周蕙兰.地球内部物理[M].北京:地震出版社,1990..
[17]Jobert N.Evalution de la periode d'ocillation d'une phere elas-tique heterogene,par application du principle de Rayleigh[J].Computes.Rendus.,1956,243:1230~1232.
[18]Pekeris C L,Alterman Z,Jarosch H.Rotational multipletsin the spectrum of the Earth[J].Phys Rev,1961,122:1692~1700.
[19]Sato Y,Usami T.Propogation of spherical disturbances onan elastic sphere with a homogeneous mantle and core[J].Bull Earthq Res Inst,1964,42:407~425.
[20]Takeuchi H,Saito M.Seismic surface waves[J].Methods inComputational Physics,1972,11:217~295.
[21]Ness N R,Harrison C T,Slichter L B.Observation of thefree oscillation of the earth[J].J Geophys Res,1961,66(2):621-629.
[22]Dziewonski A,Gilbert F.Observations of normal modesfrom 84 recordings of the Alaskan earthquake of 1964 March28[J].Geophys J R astr,1972,27:293~446.
[23]方俊.地球自由振荡[J].测量与地球物理集刊,1986,7:65~83.
[24]郭俊义.地球物理学基础[M].北京:测绘出版社,2001.
[25]雷湘鄂,许厚泽,孙和平.由5个国际超导重力仪台站资料检测到的秘鲁8.2级大地震所激发的球型地球自由振荡现象[J].中国科学,2004,34(5):483~491.
[26]Cowling T G,Newing R A.The oscillations of a rotating star[J].Astrophys J,1949,109:149~158.
[27]Ledoux P.The non-radial oscillations of gaseous stars andthe problem of Beta Canis Majoris[J].Astrophys J,1951,114:373~384.
[28]Chandrasekhar S,Lebovitz N R.On the oscillations and thestability of rotating gaseous masses[J].Astrophys J,1962,135:248~260.
[29]MacDonald G,Ness N.A study of the free oscillations of theEarth[J].J Geophys Res,1961,66:1865~1911.
[30]Caputo M.Free modes of layered oblate planets[J].J Geo-phys Res,1963,68:497~503.
[31]Dahlen F A.The normal modes of a rotating,elliptical earth-II near-resonance multiplet coupling[J].Geophys J R as-tr,1969,18:397~436.
[32]Shearer P M.Constraints on inner core anisotropy from PKP(DF)travel-times[J].J Geophys Res,1994,99:19647~19657.
[33]Durek J J,Romanowicz B.Inner core anisotropy inferred bydirect inversion of normal mode spectra[J].Geophys J Int,1999,139:599~622.
[34]Laske G,Masters G.Limits on differential rotation of the in-ner core from an analysis of Earth's free oscillations[J].Na-ture,1999,402:66~68.
[2]孙和平,徐建桥,Ducarme.基于国际超导重力仪观测资料检测地球固态内核的平动振荡[J].科学通报,2004,49(8):803~813.
[3]Benioff H,Press F,Smith S.Excitation of the free oscilla-tions of the earth by earthquake[J].J Geophys Res,1961,66(2):605~619.
[4]Song X D,Helmberger D V.Depth dependence of anisotropyof Earth's inner core[J].J Geophys Res,1995,100:9805~9816.
[5]Masters G,Laske G,Gilbert F.Matrix autoregressive analy-sis of free-oscillation coupling and splitting[J].Geophys JInt,2000,143:478~489.
[6]傅承义,陈运泰,祁贵仲.地球物理学基础[M].北京:科学出版社,1985,347~367.
[7]Goodkind J M.The superconducting gravimeters principals ofoperation,current performance and future prospects[A].In:Poitevin C ed.Pro.workshop on non-tidal gravity changes,Luxembourg,Conseil de L'Europe Cahiers du Centre Europ(ende Geodynamique et de S(ismologie,1991,9:81~90.
[8]Van Camp M.Measuring Seismic normal modes with theGWR C021 Superconducting gravimeter[J].Phys.Earth andPlan.Int.,1999,116:81~92.
[9]Neumeyer J,Bathelmes F,Combrinck L,et al.Analysis re-sults from the SG registration with the dual sphere supercon-ducting gravimeter at SAGOS(South Africa)[J].Bulletin d'Information de Marees Terrestres,2002,135:10607~10616.
[10]Jefferys H,Jefferys B S.Methods of Mathmetical Physics[J].Cambridge University Press,1956.
[11]Takeuchi H.Torsional oscillations of the earth and some re-lated problems[J].Geophys J,1959,2:89~100.
[12]Alterman Z S,Jarosh H,Pekeris C L.Oscillation of theearth[J].Proc Roy Soc,1959,252:80~95.
[13]Masters G,Gilbert F.Structure of the inner core inferredfrom observations of its spheroidal shear modes[J].GeophysRes Letter,1981,8:569~571.
[14]Morrelli A,Dziewonski A M,Woodhouse J H.Anisotropyof inner core inferred from PKIKP travel times[J].GeophysRes Letter,1986,13:1545~1548.
[15]Woodhouse J H,Giardini D,Li X D.Evidence for inner coreanisotropy from free oscillations[J].Geophys Res Letter,1986,13:1549~1552.
[16]周蕙兰.地球内部物理[M].北京:地震出版社,1990..
[17]Jobert N.Evalution de la periode d'ocillation d'une phere elas-tique heterogene,par application du principle de Rayleigh[J].Computes.Rendus.,1956,243:1230~1232.
[18]Pekeris C L,Alterman Z,Jarosch H.Rotational multipletsin the spectrum of the Earth[J].Phys Rev,1961,122:1692~1700.
[19]Sato Y,Usami T.Propogation of spherical disturbances onan elastic sphere with a homogeneous mantle and core[J].Bull Earthq Res Inst,1964,42:407~425.
[20]Takeuchi H,Saito M.Seismic surface waves[J].Methods inComputational Physics,1972,11:217~295.
[21]Ness N R,Harrison C T,Slichter L B.Observation of thefree oscillation of the earth[J].J Geophys Res,1961,66(2):621-629.
[22]Dziewonski A,Gilbert F.Observations of normal modesfrom 84 recordings of the Alaskan earthquake of 1964 March28[J].Geophys J R astr,1972,27:293~446.
[23]方俊.地球自由振荡[J].测量与地球物理集刊,1986,7:65~83.
[24]郭俊义.地球物理学基础[M].北京:测绘出版社,2001.
[25]雷湘鄂,许厚泽,孙和平.由5个国际超导重力仪台站资料检测到的秘鲁8.2级大地震所激发的球型地球自由振荡现象[J].中国科学,2004,34(5):483~491.
[26]Cowling T G,Newing R A.The oscillations of a rotating star[J].Astrophys J,1949,109:149~158.
[27]Ledoux P.The non-radial oscillations of gaseous stars andthe problem of Beta Canis Majoris[J].Astrophys J,1951,114:373~384.
[28]Chandrasekhar S,Lebovitz N R.On the oscillations and thestability of rotating gaseous masses[J].Astrophys J,1962,135:248~260.
[29]MacDonald G,Ness N.A study of the free oscillations of theEarth[J].J Geophys Res,1961,66:1865~1911.
[30]Caputo M.Free modes of layered oblate planets[J].J Geo-phys Res,1963,68:497~503.
[31]Dahlen F A.The normal modes of a rotating,elliptical earth-II near-resonance multiplet coupling[J].Geophys J R as-tr,1969,18:397~436.
[32]Shearer P M.Constraints on inner core anisotropy from PKP(DF)travel-times[J].J Geophys Res,1994,99:19647~19657.
[33]Durek J J,Romanowicz B.Inner core anisotropy inferred bydirect inversion of normal mode spectra[J].Geophys J Int,1999,139:599~622.
[34]Laske G,Masters G.Limits on differential rotation of the in-ner core from an analysis of Earth's free oscillations[J].Na-ture,1999,402:66~68.
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