利用体应变观测智利8.8级大地震激发的地球球型自由振荡
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摘要
用河北省体应变的数字化观测资料,利用功率谱密度估计方法,在没有对资料进行处理的情况下,准确获得了2010年2月27日智利8.8级大地震激发的_0S_5—_0S_(35)基频球型自由振荡,并与地球初步参考模型(PREM)的理论自由振荡频率进行对比,发现实测振荡频率与PREM预测的振荡频率基本符合。河北省体应变的数字化观测资料的确可以提取智利地震激发的地球球型振荡。
By power spectrum density estimation,we extract the fundamental-frequency,spheroidal, free oscillation(_0S_5—_0S_(35))of the Earth excited by the M 8.8 Chile great earthquake on 27 February 2010 from the data of digital Borehole Dilatometer of Hebei province without eliminating the Earth s tide.Comparing the period of the extracted oscillation with that of the theoretical oscillation from the Preliminary Reference Earth Model(PREM),we find that they are accordant with each other.This proves that extracting the free oscillation of the Earth from the data of digital borehole dilatometer is a new approach.
By power spectrum density estimation,we extract the fundamental-frequency,spheroidal, free oscillation(_0S_5—_0S_(35))of the Earth excited by the M 8.8 Chile great earthquake on 27 February 2010 from the data of digital Borehole Dilatometer of Hebei province without eliminating the Earth s tide.Comparing the period of the extracted oscillation with that of the theoretical oscillation from the Preliminary Reference Earth Model(PREM),we find that they are accordant with each other.This proves that extracting the free oscillation of the Earth from the data of digital borehole dilatometer is a new approach.
引文
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邱泽华,马瑾,池顺良,等.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[J].地球物理学报,2007,50(3) :797-805．
任佳,陈华静,蒋翠荣,等.数字化水位仪观测的苏门答腊大地震激发的地球球型自由振荡[J].地震研究,2009,32(4) :333-338．
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万永革,盛书中,周公威.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[J].地震学报,2007,29(4) :369-381．
万永革.数字信号处理的MATLAB实现[M].北京:科学出版社,2007:252-279．
万永革,周公威,郭燕平.昆仑山口西地震激发的地球环型振荡[J].防灾减灾工程学报,2004,24(1) :1-7．
万永革,周公威,郭燕平.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[J].地震,2005,25(1) :31-40．
于海英,朱元清,寿海涛.印度洋9． 0级大地震激发的地球球型振荡和环型振荡[J].地球物理学进展,2006,21(3) :706-716．
Alsop L E,Sutton G H,Ewing M.Free oscillation of Earth observed on strain and pendulum seismographs[J].J Geophy Res,1961,66(2) :631-641．
Beniofl H,Press F,Smith S.Excitation of the free oscillations of the earth by earthquakes[J].J Geophys Res,1961,66(2) :605-619．
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Dziewonski A M,Gillbert F.Observation of normal modes from 84 recordings of the Alaskan earthquakesOf 1964 March 28,Geophys[J].J R Astr Soc,1972,27:393-446．
Lamb H.On the variations of an elastic sphere[]].Lond Math Soc Proc,1882,13:233-256．
Nishida K,Kobayashi N.Statistical features of Earth s continuous free oscillations[J].Geophys Res,1999,(104) :28 741-28 750．
Nowroozi A A.Characteristic periods of fundamental and overtone oscillations of the earth following a deep-focus earthquake [J].Bull Seism Soc Amer,1972,(62) ,247-274．
Resovsky J S,Pestana R.Improved normal mode constraints on lower mantle Vp from generalized spectral fitting[J].Geophys Res Lett,2003,(30) :1-4． Tanimota T,Um J.Cause of continuous oscillations of the earth[J].Geophys Res,1999,(104) :28 723-28 740． Tanimsota T,Um J,Nishida K,et al.Earth s continuous oscillations observed on seismically quiet days[J].Geophys Res Lett,1998,(25) :1 553-1 556．
Widmer Schnidrig R.Free oscillations illuminate the mantle[J].Nature,1999,(398) :292-293． Zadro M,Braitenberg C.Measurements and interpretations of tiltstrain gauges in seismically active areas[J].Earth Science Reviews,1999,47:151-187．
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自由振荡现象[J].中国科学(D辑),2004,34(5) :483-491．
吕永清,蔡亚先,周云耀.用JCZ-1超宽频带数字地震仪观测地球自由振荡[J].地壳形变与地震,1997,17(3) :103 105．
邱泽华,马瑾,池顺良,等.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[J].地球物理学报,2007,50(3) :797-805．
任佳,陈华静,蒋翠荣,等.数字化水位仪观测的苏门答腊大地震激发的地球球型自由振荡[J].地震研究,2009,32(4) :333-338．
任佳,陈华静,王松,等.汶川大地震激发的地球球型自由振荡[J].中国地震,2009,25(1) :73-80．
唐磊,邱泽华,阚宝祥.中国钻孔体应变台网观测到的地球球型振荡[J].大地测量与地球动力学,2007,27(6) :37-44．
万永革,盛书中,周公威.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[J].地震学报,2007,29(4) :369-381．
万永革.数字信号处理的MATLAB实现[M].北京:科学出版社,2007:252-279．
万永革,周公威,郭燕平.昆仑山口西地震激发的地球环型振荡[J].防灾减灾工程学报,2004,24(1) :1-7．
万永革,周公威,郭燕平.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[J].地震,2005,25(1) :31-40．
于海英,朱元清,寿海涛.印度洋9． 0级大地震激发的地球球型振荡和环型振荡[J].地球物理学进展,2006,21(3) :706-716．
Alsop L E,Sutton G H,Ewing M.Free oscillation of Earth observed on strain and pendulum seismographs[J].J Geophy Res,1961,66(2) :631-641．
Beniofl H,Press F,Smith S.Excitation of the free oscillations of the earth by earthquakes[J].J Geophys Res,1961,66(2) :605-619．
Bogert B P.An observation of free oscillations of the Earth[J].J Geophys Res,1961,66(2) ,643-646． Bolt B A,Currie R G.Maximum entropy estimates of Earth torsional eigenperiods from 1960 trieste data,Geophys[J].J R Astr Soc,1975,40:107-114．
Dziewonski A M,Gillbert F.Observation of normal modes from 84 recordings of the Alaskan earthquakesOf 1964 March 28,Geophys[J].J R Astr Soc,1972,27:393-446．
Lamb H.On the variations of an elastic sphere[]].Lond Math Soc Proc,1882,13:233-256．
Nishida K,Kobayashi N.Statistical features of Earth s continuous free oscillations[J].Geophys Res,1999,(104) :28 741-28 750．
Nowroozi A A.Characteristic periods of fundamental and overtone oscillations of the earth following a deep-focus earthquake [J].Bull Seism Soc Amer,1972,(62) ,247-274．
Resovsky J S,Pestana R.Improved normal mode constraints on lower mantle Vp from generalized spectral fitting[J].Geophys Res Lett,2003,(30) :1-4． Tanimota T,Um J.Cause of continuous oscillations of the earth[J].Geophys Res,1999,(104) :28 723-28 740． Tanimsota T,Um J,Nishida K,et al.Earth s continuous oscillations observed on seismically quiet days[J].Geophys Res Lett,1998,(25) :1 553-1 556．
Widmer Schnidrig R.Free oscillations illuminate the mantle[J].Nature,1999,(398) :292-293． Zadro M,Braitenberg C.Measurements and interpretations of tiltstrain gauges in seismically active areas[J].Earth Science Reviews,1999,47:151-187．
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