汶川大地震激发的地球球型自由振荡
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摘要
用垂直摆倾斜仪和水管倾斜仪的数字化观测资料,利用功率谱密度估计方法,在没有对资料进行去固体潮处理的情况下,准确获得了2008年5月12日汶川8.0级大地震激发的0S6～0S32基频球型自由振荡。并与PREM模型的理论自由振荡周期进行了对比,发现实测振荡周期与PREM预测的振荡周期相吻合,除0S7振型的观测周期和PREM模型理论周期的相对误差大于0.3%外,其他振型的观测周期和PREM模型理论周期的相对误差大都集中在0.1%左右。可以从垂直摆倾斜仪和水管倾斜仪的观测资料中提取汶川地震激发的地球球型振荡信息,这为地球自由振荡的研究提供了一种新的仪器观测方法。用数字化地倾斜观测资料研究地球自由振荡问题或许有着较好的前景。
Based on the digital observatory data of pendulum tilt-meter and water tube tilt-meter,spheroidal modes of earth's free oscillations,induced by the M_S8.0 Wenchuan strong earthquake occurred on May 12,2008,was obtained with the method of power spectral density estimation without any calculation to erase solid tide.The result matches well with the PREM's when it is compared with the theoretical free oscillation of PREM model with the exception of _0S_7,and the relative errors that are mostly bigger than 0.3%.All other relative errors concentrate on 0.1%.This research provides a new method to get spheroidal modes of earth's free oscillations from observatory data of pendulum tilt-meter and water tube tilt-meter,which may be useful in the future of the earth's free oscillations research.
Based on the digital observatory data of pendulum tilt-meter and water tube tilt-meter,spheroidal modes of earth's free oscillations,induced by the M_S8.0 Wenchuan strong earthquake occurred on May 12,2008,was obtained with the method of power spectral density estimation without any calculation to erase solid tide.The result matches well with the PREM's when it is compared with the theoretical free oscillation of PREM model with the exception of _0S_7,and the relative errors that are mostly bigger than 0.3%.All other relative errors concentrate on 0.1%.This research provides a new method to get spheroidal modes of earth's free oscillations from observatory data of pendulum tilt-meter and water tube tilt-meter,which may be useful in the future of the earth's free oscillations research.
引文
傅承义、陈运泰、祁贵仲,1985,地球物理学基础,347～368,北京:地震出版社。
国家地震局科技监测司,1995,地震地形变观测技术,北京:地震出版社。
雷湘鄂、许厚泽、孙和平,2002,利用超导重力观测资料检测地球自由振荡,科学通报,47(18),1432～1436。
雷湘鄂、许厚泽、孙和平,2004,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自由振荡现象,中国科学(D辑),34(5),483～491。
吕永清、蔡亚先、周云耀,1997,用JCZ-1超宽频带数字地震仪观测地球自由振荡,地壳形变与地震,17(3),103～105。
邱泽华、马瑾、池顺良等,2007,钻孔差应变仪观测的苏门答腊大地震激发的地球环型自由振荡,地球物理学报,50(3),797～805。
唐磊、邱泽华、阚宝祥,2007,中国钻孔体应变台网观测到的地球球型振荡,大地测量与地球动力学,27(6),37～44。
万永革、周公威、郭燕平,2004,昆仑山口西地震激发的地球环型振荡,防灾减灾工程学报,24(1),1～7。
万永革、周公威、郭燕平,2005,中国数字地震台网记录的昆仑山口西地震的球型自由振荡,地震,25(1),31～40。
万永革、盛书中、周公威,2007,中国数字地震台网记录的苏门答腊-安达曼地震激发的地球球型自由振荡的检测,地震学报,29(4),369～381。
万永革,2007,数字信号处理的MATLAB实现,北京:科学出版社,252～279。
于海英、朱元清、寿海涛,2006,印度洋9.0级大地震激发的地球球型振荡和环型振荡,地球物理学进展,21(3),706～716。
Alsop L.E.,Sutton G.H.,Ewing M.,1961,Free oscillation of Earth observed on strain and pendulumseismographs,J.Geophy.Res.,66(2),631～641.
Benioff H.,Press F.,Smith S.,1961,Excitation of the free oscillations of the earth by earthquakes,J.Geophys.Res.,66(2),605～619.
Beroza G.C.,Jordan T.H.,1990,Searchingfor slowand silent earthquakes usingfree oscillations,J.Geophys Res.,95(B3),2485～2510.
Bogert B.P.,1961,An observation of free oscillations of the Earth,J.Geophys.Res.,66(2),643～646.
Bolt B.A.,Currie R.G.,1975,Maximumentropy estimates of Earthtorsional eigenperiods from1960trieste data,Geophys.J.R.Astr.Soc.,40,107～114.
Dziewonski A.M.,Gillbert F.,1972,Observation of normal modes from84recordings of the Alaskan earthquakes0f1964March28,Geophys.J.R.Astr.Soc.,27,393～446.
Lamb H.,1882,Onthe variations of an elastic sphere,Lond.Math.Soc.Proc.,13,233～256.
Masters G.,Park J.,Gilbert F.,1983,Observations of coupled spheroidal and toroidal modes,J.Geophys.Res.,88(B12),10285～10298.
Nishida K.,Kobayashi N.,1999,Statistical features of Earth s continuous free oscillations,Geophys Res,(104),28741～28750.
Nowroozi A.A.,1972,Characteristic periods of fundamental and overtone oscillations of the earthfollowing a deep-focus earthquake,BullSeismSoc Amer,(62),247～274.
Park J.,Song T.A.,Tromp J.et al,2005,Earth s free oscillations excited by the26December2004Sumatra Andaman earthquake,Science,308,1139～1146.
Resovsky J.S.,Pestana R.,2003,Improved normal mode constraints on lower mantle Vp fromgeneralized spectral fitting,Geophys ResLett,(30),1～4.
Tanimsota T.,UmJ.,Nishida K.et al,1998,Earth s continuous oscillations observed on seismically quiet days,Geophys ResLett,(25),1553～1556.
Tanimota T.,UmJ.,1999,Cause of continuous oscillations of the earth,Geophys res,(104),28723～28740.
Widmer-Schnidrig R.,1999,Free oscillations illuminate the mantle,Nature,(398),292～293.
Zadro M.,Braitenberg C.,1999,Measurements andinterpretations of tiltstrain gaugesin seismically active areas,Earth Science Reviews,47,151～187.
Zurn W.,Laske G.,Widmer-Schnidrig R.et al,2000,Observation of coriolis coupled modes bellow1mHz,Geophys.J.Int.,143,113～118.
国家地震局科技监测司,1995,地震地形变观测技术,北京:地震出版社。
雷湘鄂、许厚泽、孙和平,2002,利用超导重力观测资料检测地球自由振荡,科学通报,47(18),1432～1436。
雷湘鄂、许厚泽、孙和平,2004,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自由振荡现象,中国科学(D辑),34(5),483～491。
吕永清、蔡亚先、周云耀,1997,用JCZ-1超宽频带数字地震仪观测地球自由振荡,地壳形变与地震,17(3),103～105。
邱泽华、马瑾、池顺良等,2007,钻孔差应变仪观测的苏门答腊大地震激发的地球环型自由振荡,地球物理学报,50(3),797～805。
唐磊、邱泽华、阚宝祥,2007,中国钻孔体应变台网观测到的地球球型振荡,大地测量与地球动力学,27(6),37～44。
万永革、周公威、郭燕平,2004,昆仑山口西地震激发的地球环型振荡,防灾减灾工程学报,24(1),1～7。
万永革、周公威、郭燕平,2005,中国数字地震台网记录的昆仑山口西地震的球型自由振荡,地震,25(1),31～40。
万永革、盛书中、周公威,2007,中国数字地震台网记录的苏门答腊-安达曼地震激发的地球球型自由振荡的检测,地震学报,29(4),369～381。
万永革,2007,数字信号处理的MATLAB实现,北京:科学出版社,252～279。
于海英、朱元清、寿海涛,2006,印度洋9.0级大地震激发的地球球型振荡和环型振荡,地球物理学进展,21(3),706～716。
Alsop L.E.,Sutton G.H.,Ewing M.,1961,Free oscillation of Earth observed on strain and pendulumseismographs,J.Geophy.Res.,66(2),631～641.
Benioff H.,Press F.,Smith S.,1961,Excitation of the free oscillations of the earth by earthquakes,J.Geophys.Res.,66(2),605～619.
Beroza G.C.,Jordan T.H.,1990,Searchingfor slowand silent earthquakes usingfree oscillations,J.Geophys Res.,95(B3),2485～2510.
Bogert B.P.,1961,An observation of free oscillations of the Earth,J.Geophys.Res.,66(2),643～646.
Bolt B.A.,Currie R.G.,1975,Maximumentropy estimates of Earthtorsional eigenperiods from1960trieste data,Geophys.J.R.Astr.Soc.,40,107～114.
Dziewonski A.M.,Gillbert F.,1972,Observation of normal modes from84recordings of the Alaskan earthquakes0f1964March28,Geophys.J.R.Astr.Soc.,27,393～446.
Lamb H.,1882,Onthe variations of an elastic sphere,Lond.Math.Soc.Proc.,13,233～256.
Masters G.,Park J.,Gilbert F.,1983,Observations of coupled spheroidal and toroidal modes,J.Geophys.Res.,88(B12),10285～10298.
Nishida K.,Kobayashi N.,1999,Statistical features of Earth s continuous free oscillations,Geophys Res,(104),28741～28750.
Nowroozi A.A.,1972,Characteristic periods of fundamental and overtone oscillations of the earthfollowing a deep-focus earthquake,BullSeismSoc Amer,(62),247～274.
Park J.,Song T.A.,Tromp J.et al,2005,Earth s free oscillations excited by the26December2004Sumatra Andaman earthquake,Science,308,1139～1146.
Resovsky J.S.,Pestana R.,2003,Improved normal mode constraints on lower mantle Vp fromgeneralized spectral fitting,Geophys ResLett,(30),1～4.
Tanimsota T.,UmJ.,Nishida K.et al,1998,Earth s continuous oscillations observed on seismically quiet days,Geophys ResLett,(25),1553～1556.
Tanimota T.,UmJ.,1999,Cause of continuous oscillations of the earth,Geophys res,(104),28723～28740.
Widmer-Schnidrig R.,1999,Free oscillations illuminate the mantle,Nature,(398),292～293.
Zadro M.,Braitenberg C.,1999,Measurements andinterpretations of tiltstrain gaugesin seismically active areas,Earth Science Reviews,47,151～187.
Zurn W.,Laske G.,Widmer-Schnidrig R.et al,2000,Observation of coriolis coupled modes bellow1mHz,Geophys.J.Int.,143,113～118.
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