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
摘要
基于全球分布的14个台站GWR超导重力仪21个高精度潮汐重力观测系列(约86年),检测了地球固态内核平动振荡现象.将观测数据分成G-Ⅰ组(8个较长观测系列)和G-Ⅱ组(13个较短观测系列).首先对各台站每分钟原始观测数据实施仔细修正,消除由地震和电脉冲等导致的错误数据和大气变化等干扰影响,再扣除理论潮汐重力信号获得观测残差.然后分别对各残差系列做Fourier谱分析,最后基于多台站资料迭积技术,求得亚潮汐频段上的积谱密度估计.在进一步消去剩余气压效应后,检测到8个公共谱峰.计算了这些谱峰的本征周期、品质因子和共振强度.数值结果说明其中3个公共谱峰的本征周期与Smith理论值间的最大差异小于1.0%,这种一致性说明了利用高精度地表重力观测可检测到固态内核的动力学现象.还检验了数值计算的可靠性,对地球自转和椭率可能导致的谱峰分裂现象进行了简要的探讨.
引文
1 Smith M L. Translational inner core oscillations of for a rotating,slightly elliptical Earth. Journal of Geophysical Research, 1976,81(17): 3055~3064
2 Smylie D E, Rochester M G. Compressibility, core dynamics andthe subseimic wave equation. Physics of the Earth and PlanetaryInterior, 1981, 24: 308~319
3 Crossley D, Hinderer J, Casula G, et al. Network ofsuperconducting gravimeters benefits a number of disciplines. Eos,Transactions, American Geophysical Union, 1999, 80(11), 121:125~126
4 Melchior P, Ducarme B. Detection of inertial gravity oscillationsin the earth's core with a superconducting gravimeter at Brussels.Physics of the Earth and Planetary Interior, 1986, 42: 129~134
5 Smylie D E. The inner core translational triplet and the densitynear the Earth's center. Science, 1992, 255: 1678~1682
6 Smylie D E. Viscosity near Earth's solid inner core. Science, 1999,284: 461~463
7 Slichter L B. The fundamental free mode of the Earth's inner core.Natl Acad Science, 1961, 47: 186~190
8 Smith M L. Translational inner core oscillations of for a rotating,slightly elliptical Earth. Journal of Geophysical Research, 1976,81(17): 3055~3064
9 Hinderer J, Crossley D J, Jensen O. A. search for the Slichtertriplet in superconducting gravimeter data. Physics of the Earthand Planetary Interior, 1995, 90: 183~195
10 Cummins P, Wahr J, Agnew D, et al. Constraining core undertonesusing stacked IDA gravity records. Geophysical JournalInternational, 1991, 106: 189~198
11 Smylie D E, Hinderer J, Richter B, et al. The product spectra ofgravity and barometric pressure in Europe. Physics of the Earthand Planetary Interior, 1993, 80: 135~157
12 Courtier N, Ducarme B, Goodkind J, et al. GlobalSuperconducting gravimeter observations and the search for thetranslational modes of the inner core. Physics of the Earth andPlanetary Interiors, 2000, 117: 3~20
13 Sun H P, Ducarme B, Xu J Q. Preliminary results of the free corenutation eigenperiod obtained by stacking SG observations at GGPstations. Bulletin D'Information Marées Terrestres, 2002, 136:10725~10728
14 徐建桥, 孙和平, 罗少聪. 利用国际超导重力仪观测资料研究地球自由核章动. 中国科学, D 辑, 2001, 31(9): 719~726
15 孙和平, 徐建桥, Ducarme B. 基于全球超导重力仪观测资料考虑液核近周日共振效应的固体潮实验模型. 科学通报, 2003, 48(6): 610~614
16 Goodkind J M. The superconducting gravimeters principals ofoperation, current performance and future prospects. In: PoitevinC, ed. Proc. workshop on non-tidal gravity changes. Luxembourg:Conseil de L'Europe Cahiers du Centre Européen deGeodynamique et de Séismologie, 1991, 9: 81~90
17 Ducarme B, Sun H P. Tidal gravity results from GGP network inconnection with tidal loading and earth response. Journal of theGeodetic Society of Japan, 2001, 47(1): 308~315
18 Ducarme B, Sun H P, Xu J Q. New Investigation of Tidal GravityResults from the GGP Network. Bulletin D'Information MaréesTerrestres, 2002, 136: 10761~10775
19 Vauterin P. Tsoft: Graphical and interactive software for theanalysis of Earth tide data. In: Paquet P, Ducarme B, eds. Proc.13th Int. Sympos. Earth Tides. Brussels: Royal Observatory ofBelgium, 1998. 481~486
20 Merriam J B. The atmospheric pressure correction in gravity atCantley, Quebec. In: Hsu H T, ed. Proc. 12th Int. Sympos. EarthTides. Beijing: Science Press, 1993. 161~186
21 Sun H P, Hsu H T, Jentzsch G, et al. Tidal gravity observationsobtained with superconducting gravimeter and its application togeodynamics at Wuhan/China. Journal of Geodynamics, 2002,33(1-2): 187~198
22 Tamura Y. A harmonic development of the tide-generating potential.Bulletin D'Information Marées Terrestres, 1987, 99: 6813~6855
23 Wenzel H G. Earth tide data processing package ETERNA 3.30:the nGal software. In: Paquet P, Ducarme B, eds. Proc. 13th Int.Sympos. Earth Tides. Brussels: Royal Observatory of Belgium,1998. 487~494
24 Sun H P, Luo S C. Theoretical computation and detection of theatmospheric gravity signals. Chinese Journal of Geophysics, 1999,41(3): 405~413
25 Sun H P. Comprehensive researches for the effect of the oceanloading on gravity
2 Smylie D E, Rochester M G. Compressibility, core dynamics andthe subseimic wave equation. Physics of the Earth and PlanetaryInterior, 1981, 24: 308~319
3 Crossley D, Hinderer J, Casula G, et al. Network ofsuperconducting gravimeters benefits a number of disciplines. Eos,Transactions, American Geophysical Union, 1999, 80(11), 121:125~126
4 Melchior P, Ducarme B. Detection of inertial gravity oscillationsin the earth's core with a superconducting gravimeter at Brussels.Physics of the Earth and Planetary Interior, 1986, 42: 129~134
5 Smylie D E. The inner core translational triplet and the densitynear the Earth's center. Science, 1992, 255: 1678~1682
6 Smylie D E. Viscosity near Earth's solid inner core. Science, 1999,284: 461~463
7 Slichter L B. The fundamental free mode of the Earth's inner core.Natl Acad Science, 1961, 47: 186~190
8 Smith M L. Translational inner core oscillations of for a rotating,slightly elliptical Earth. Journal of Geophysical Research, 1976,81(17): 3055~3064
9 Hinderer J, Crossley D J, Jensen O. A. search for the Slichtertriplet in superconducting gravimeter data. Physics of the Earthand Planetary Interior, 1995, 90: 183~195
10 Cummins P, Wahr J, Agnew D, et al. Constraining core undertonesusing stacked IDA gravity records. Geophysical JournalInternational, 1991, 106: 189~198
11 Smylie D E, Hinderer J, Richter B, et al. The product spectra ofgravity and barometric pressure in Europe. Physics of the Earthand Planetary Interior, 1993, 80: 135~157
12 Courtier N, Ducarme B, Goodkind J, et al. GlobalSuperconducting gravimeter observations and the search for thetranslational modes of the inner core. Physics of the Earth andPlanetary Interiors, 2000, 117: 3~20
13 Sun H P, Ducarme B, Xu J Q. Preliminary results of the free corenutation eigenperiod obtained by stacking SG observations at GGPstations. Bulletin D'Information Marées Terrestres, 2002, 136:10725~10728
14 徐建桥, 孙和平, 罗少聪. 利用国际超导重力仪观测资料研究地球自由核章动. 中国科学, D 辑, 2001, 31(9): 719~726
15 孙和平, 徐建桥, Ducarme B. 基于全球超导重力仪观测资料考虑液核近周日共振效应的固体潮实验模型. 科学通报, 2003, 48(6): 610~614
16 Goodkind J M. The superconducting gravimeters principals ofoperation, current performance and future prospects. In: PoitevinC, ed. Proc. workshop on non-tidal gravity changes. Luxembourg:Conseil de L'Europe Cahiers du Centre Européen deGeodynamique et de Séismologie, 1991, 9: 81~90
17 Ducarme B, Sun H P. Tidal gravity results from GGP network inconnection with tidal loading and earth response. Journal of theGeodetic Society of Japan, 2001, 47(1): 308~315
18 Ducarme B, Sun H P, Xu J Q. New Investigation of Tidal GravityResults from the GGP Network. Bulletin D'Information MaréesTerrestres, 2002, 136: 10761~10775
19 Vauterin P. Tsoft: Graphical and interactive software for theanalysis of Earth tide data. In: Paquet P, Ducarme B, eds. Proc.13th Int. Sympos. Earth Tides. Brussels: Royal Observatory ofBelgium, 1998. 481~486
20 Merriam J B. The atmospheric pressure correction in gravity atCantley, Quebec. In: Hsu H T, ed. Proc. 12th Int. Sympos. EarthTides. Beijing: Science Press, 1993. 161~186
21 Sun H P, Hsu H T, Jentzsch G, et al. Tidal gravity observationsobtained with superconducting gravimeter and its application togeodynamics at Wuhan/China. Journal of Geodynamics, 2002,33(1-2): 187~198
22 Tamura Y. A harmonic development of the tide-generating potential.Bulletin D'Information Marées Terrestres, 1987, 99: 6813~6855
23 Wenzel H G. Earth tide data processing package ETERNA 3.30:the nGal software. In: Paquet P, Ducarme B, eds. Proc. 13th Int.Sympos. Earth Tides. Brussels: Royal Observatory of Belgium,1998. 487~494
24 Sun H P, Luo S C. Theoretical computation and detection of theatmospheric gravity signals. Chinese Journal of Geophysics, 1999,41(3): 405~413
25 Sun H P. Comprehensive researches for the effect of the oceanloading on gravity
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